What changed in this filing

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Item 8. Financial Statements and Supplementary Data

2022-03-31 compared with 2021-03-29 · 331 added, 542 removed, 234 unchanged (79% of the section changed)

Financial Statements and Supplementary Data

Report of Independent Registered Public Accounting Firm

Report of Independent Registered Public Accounting Firm (PCAOB ID:

Balance Sheets

Statements of Operations and Comprehensive Loss

Statements of Redeemable Convertible Preferred Stock and Stockholders Equity (Deficit)

Statements of Redeemable Convertible Preferred Stock and Stockholders’

Equity (Deficit)

Statements of Cash Flows

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Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Silverback Therapeutics, Inc.

To the Stockholders and Board of Directors of Silverback Therapeutics, Inc.:

Opinion on the Financial Statements

We have audited the

accompanying balance sheets of Silverback Therapeutics Inc.

(the Company) as of December 31, 2020 and 2019, the related statements of operations, comprehensive loss, redeemable convertible preferred stock and stockholders equity (deficit)

and cash flows for each of the two years in the period ended December 31, 2020, and the related notes (collectively referred to as the financial statements).

In our opinion, the financial statements present fairly, in all material

respects, the financial position of the Company at December 31, 2020 and 2019, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2020, in conformity with U.S.

generally accepted

accounting principles.

We have audited the accompanying balance sheets of Silverback Therapeutics, Inc.

(the Company), as of December 31, 2021 and 2020, the related statements of operations and comprehensive loss, redeemable convertible preferred stock and stockholders’

equity (deficit) and cash flows for each of the two years then ended, and the related notes (collectively referred to as the “financial statements”).

In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2021 and 2020, and the results of its operations and its cash flows for each of the two years then ended in conformity with U.S.

generally accepted accounting principles.

Basis for Opinion

financial statements are the responsibility of the Companys management.

Our responsibility is to express an opinion on the Companys financial statements based on our audits.

We are a public accounting firm registered with the Public

Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S.

federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission

and the PCAOB.

These financial statements are the responsibility of the Company's management.

Our responsibility is to express an opinion on the Company’s financial statements based on our audits.

We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S.

federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB.

Those standards require that we plan and perform the audit to

obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.

The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial

As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Companys internal control over financial

Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud.

The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting.

Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the

financial statements, whether due to error or fraud, and performing procedures that respond to those risks.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks.

Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements.

also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements.

Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements.

We believe that our audits provide a reasonable basis for our opinion.

/s/ Ernst & Young LLP

We have served as the Companys auditor

We have served as the Company’s auditor since 2020.

Seattle, Washington

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Balance Sheets

thousands, except share and par value data)

(in thousands, except share and par value data)

Current assets:

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Total current assets

Property and equipment, net

Restricted cash

Right-of-use asset

Liabilities, redeemable convertible preferred stock, and stockholders equity (deficit)

Right-of-use assets

Property and equipment, net

Liabilities and stockholders’

Current liabilities:

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Term loan payable, net

Convertible notes, net

Current portion of lease liability

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Commitments and contingencies (Note 12)

Redeemable convertible preferred stock, $0.0001 par value per share;

no shares and 17,142,854 shares

authorized, no shares and 15,714,283 shares issued and outstanding with aggregate liquidation preference of $0 and $55,000 at December 31, 2020 and 2019, respectively

Stockholders equity (deficit):

Stockholders’

Preferred Stock, $ 0.0001 par value per share;

10,000,000 and no shares authorized at December 31, 2020

and 2019, respectively;

no shares issued and outstanding at December 31, 2020 and 2019

10,000,000 shares authorized at

December 31, 2021 and 2020;

no shares issued and outstanding at December 31, 2021

Common stock, $ 0.0001 par value per share;

200,000,000 and 23,500,000 shares authorized, 34,801,537 and

670,477 shares issued, and 34,701,274 and 664,431 shares outstanding at December 31, 2020 and 2019, respectively

200,000,000 shares authorized at

December 31, 2021 and 2020, 35,133,934 and 34,801,537 shares issued and 35,107,651

and 34,701,274 shares outstanding at December 31, 2021 and 2020, respectively

Additional paid-in capital

Accumulated other comprehensive loss

Accumulated deficit

Total stockholders equity (deficit)

Total liabilities, redeemable convertible preferred stock, and stockholders equity (deficit)

Total stockholders’

Total liabilities and stockholders’

The accompanying notes are an integral part of these financial statements.

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(in thousands, except share and per share data)

Years Ended December 31,

Operating expenses:

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Interest income (expense), net

Net loss and comprehensive loss

Net loss per share applicable to common stockholders, basic and diluted

Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and

Unrealized loss on available-for-sale securities

Comprehensive loss attributable to common stockholders

Net loss per share attributable to common stockholders,

basic and diluted

Weighted-average shares used in computing net loss per share

attributable to common stockholders, basic and diluted

The accompanying notes are an integral part of these financial statements.

Silverback Therapeutics, Inc.

Statements of Redeemable Convertible Preferred Stock and Stockholders Equity (Deficit)

Statements of Redeemable Convertible Preferred Stock and Stockholders’

Equity (Deficit)

(in thousands, except share data)

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Preferred Stock

Stockholders

Equity (Deficit)

Balance as of December 31, 2018

Exercise of common stock options and vesting of early exercised common stock options

Accumulated Other

Stockholders’

Comprehensive Loss

Balance as of January 1, 2020

Issuance of Series B redeemable convertible preferred

stock for cash, net of $ 76 in issuance costs (Note 8)

Issuance of Series B redeemable convertible preferred

stock upon conversion of convertible notes

Issuance of Series C redeemable convertible preferred stock upon conversion of convertible notes

Redeemable convertible preferred stock converted into shares of common stock

Initial public offering of common stock, net of $ 22,386 in issuance costs

Exercise of common stock options and vesting of early

exercised common stock options

Stock-based compensation

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Balance as of December 31, 2020

Issuance of Series B redeemable convertible preferred stock for cash, net of $76 in issuance costs

Issuance of Series B redeemable convertible preferred stock upon conversion of convertible notes

Issuance of Series C redeemable convertible preferred stock for cash, net of $53 in issuance costs

Redeemable convertible preferred stock converted into shares of common stock

Initial public offering of common stock, net of $22,386 in issuance costs

Exercise of common stock options and warrants and vesting of early exercised common stock options

Exercise of common stock options, shares issued

under the employee stock purchase plan, and

vesting of early exercised common stock

Stock-based compensation

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(in thousands)

Years Ended December 31,

Cash flows from operating activities:

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Depreciation expense

Amortization of debt issuance costs

Stock-based compensation expense

Stock-based compensation

Non-cash lease expense

Amortization of debt issuance costs

Changes in operating assets and liabilities:

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Cash flows from investing activities:

Purchases of available-for-sale securities

Purchase of property and equipment

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Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs

Proceeds from issuance of common stock upon initial public offering, net of underwriting discounts and

Proceeds from issuance of common stock upon initial public offering, net of underwriting discounts and commissions

Payment of deferred offering costs

Proceeds from issuance of convertible notes

Payment of convertible notes issuance costs

Principal payments on term loan payable

Proceeds from exercise of common stock options

Net cash (used in) provided by financing activities

Proceeds from exercise of common stock options and employee stock purchase plan

Net cash provided by financing activities

Change in cash, cash equivalents, and restricted cash

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Unpaid initial public offering costs included in accounts payable and accrued expenses

Change in early exercise liability included in accounts payable and accrued expenses

Issuance of Series B redeemable convertible preferred stock upon conversion of convertible notes

Right-of-use assets and lease liabilities recognized

Issuance of Series B redeemable convertible preferred stock upon conversion of

convertible notes

Conversion of redeemable convertible preferred stock upon closing of initial public offering

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Silverback Therapeutics, Inc.

(Silverback or the Company) is a clinical-stage biopharmaceutical company focused on leveraging its proprietary ImmunoTAC technology platform to develop systemically delivered and tissue targeted therapeutics for the

treatment of cancer, chronic viral infections, and other serious diseases.

The Companys platform enables us to strategically pair proprietary linker-payloads that modulate key disease-modifying pathways with monoclonal antibodies directed at

specific disease sites.

(“Silverback”

or “the Company”) is a biopharmaceutical company focused on leveraging its proprietary ImmunoTAC technology platform to develop systemically delivered, tissue targeted therapeutics for the treatment of chronic viral infections, cancer, and other serious diseases.

The Company’s ImmunoTAC platform is the result of a focused effort to discover ways to systemically deliver disease-modifying small molecules in a directed fashion to sites of disease.

The Company’s platform enables it to strategically pair proprietary linker-payloads that modulate key disease-modifying pathways with monoclonal antibodies directed to specific disease sites.

The Company was formed in Seattle, Washington and incorporated in the state of Delaware on January 4, 2016.

Reverse Stock Split

In November 2020, the Companys Board of Directors approved an amendment to the Companys certificate of incorporation to effect a

reverse split of shares of the Companys common stock on a one-for-3.713 basis, which was effected on November 30, 2020 (the Reverse Stock Split).

The number of authorized shares and the par values of the common stock and redeemable convertible preferred stock were not adjusted as a result of the Reverse Stock Split.

In connection with the Reverse Stock Split, the conversion ratio for the

Companys outstanding redeemable convertible preferred stock was proportionately adjusted such that the common stock issuable upon conversion of such preferred stock was decreased in proportion to the Reverse Stock Split.

All references to

common stock and options to purchase common stock share data, per share data, and related information contained in the financial statements have been retroactively adjusted to reflect the effect of the Reverse Stock Split for all periods presented.

Initial Public Offering and Related Transaction

On December 3, 2020, the Companys registration statement on Form S-1 (File No.

333-250009) for its initial public offering of common stock (IPO) was declared effective by the Securities and Exchange Commission (SEC).

On December 8, 2020, the Company issued

and sold 13,225,000 shares of common stock in the IPO at a public offering price of $21.00 per share, resulting in net proceeds of $255.3 million after deducting underwriting discounts and commissions and offering expenses paid by the

In connection with the IPO, all 77,074,884 shares of redeemable convertible preferred stock outstanding at the time of the IPO converted

into 20,758,098 shares of the Companys common stock.

Initial Public Offering

In December 2020, the Company completed its initial public offering of common stock (“IPO”) of 13,225,000 shares of common stock at a public offering price of $ 21.00 per share, resulting in net proceeds of $ 255.3 million after deducting underwriting discounts and commissions and offering expenses paid by the Company.

In connection with the IPO, all 77,074,884 shares of redeemable convertible preferred stock outstanding at the time of the IPO converted into 20,758,098 shares of the Company’s common stock.

Additionally, in November 2020, the Company’s Board of Directors approved an amendment to the Company’s certificate of incorporation to effect a reverse split of shares of the Company’s common stock on a one-for-3.713 basis, which was effected on November 30, 2020 (the “Reverse Stock Split”) in anticipation of the IPO.

All references to common stock and options to purchase common stock share data, per share data, and related information contained in the financial statements have been retroactively adjusted to reflect the effect of the Reverse Stock Split for all periods presented.

Risks and Uncertainties

The Company is subject to a number of inherent risks which include, but are not limited to, the need to obtain adequate additional funding, possible

failure of clinical trials or other events demonstrating a lack of clinical safety or efficacy of its product candidates, dependence on key personnel, reliance on third-party service providers for manufacturing drug product and conducting clinical

trials, the ability to successfully secure its proprietary technology, and risks related to the regulatory approval and commercialization of a product candidate.

Additionally, the development and commercialization of new drug products is highly

Products or technologies developed by competitors may diminish or render obsolete the Companys existing products under development.

Silverback Therapeutics, Inc.

Notes to Financial Statements

The Company is subject to a number of inherent risks which include, but are not limited to, the need to obtain adequate additional funding, possible failure of clinical trials or other events demonstrating a lack of clinical safety or efficacy of its product candidates, dependence on key personnel, reliance on third-party service providers for manufacturing drug product and conducting clinical trials, the ability to successfully secure its proprietary technology, and risks related to the regulatory approval and commercialization of a product candidate.

Additionally, the development and commercialization of new drug products is highly competitive.

Products or technologies developed by competitors may diminish or render obsolete the Company’s existing products under development.

Liquidity and Capital Resources

The accompanying financial statements have been prepared assuming that the Company will continue as a going concern.

The Company has incurred net

operating losses since its inception and had an accumulated deficit of $96.7 million as of December 31, 2020.

The Company had cash and cash equivalents of $386.6 million as of December 31, 2020 and has not generated positive cash

flows from operations.

To date, the Company has been able to fund its operations primarily through the issuance of redeemable convertible preferred stock and convertible notes.

During 2020, the Company has received an aggregate of $68.4 million

in gross proceeds from the issuance of shares of its Series B redeemable convertible preferred stock and an aggregate of $84.9 million in gross proceeds from the issuance of shares of its Series C redeemable convertible preferred stock.

December 2020, the Company completed an initial public offering in which it sold 13,225,000 shares of common stock at $21.00 per share and received net proceeds, after underwriting discounts and offering costs, of $255.3 million.

Companys currently available cash and cash equivalents as of December 31, 2020 are sufficient to meet its anticipated cash requirements for the 12 months following the date the financial statements are issued.

Management considers that

there are no conditions or events, in the aggregate, that raise substantial doubt about the entitys ability to continue as a going concern for a period of at least 12 months from the date the financial statements are issued.

The Company has incurred net operating losses since its inception and had an accumulated deficit of $ 186.2 million as of December 31, 2021 .

The Company had cash, cash equivalents, restricted cash, and investments of $ 319.1 million as of December 31, 2021 and has not generated positive cash flows from operations.

To date, the Company has funded its operations primarily through the issuance of redeemable convertible preferred stock, convertible notes, and the sale of common stock in connection with the IPO.

The Company’s currently available cash, cash equivalents, restricted cash, and investments as of December 31, 2021 are sufficient to meet its anticipated cash requirements for at least the 12 months following the date the financial statements are issued.

Management considers that there are no conditions or events, in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern for a period of at least 12 months from the date the financial statements are issued.

Management expects operating losses to continue for the foreseeable future.

There can be no assurance that the Company will ever earn revenues or

achieve profitability, or if achieved, that they will be sustained on a continuing basis.

In addition, the preclinical manufacturing, and clinical development activities as well as the commercialization of the Companys products, if approved,

will require significant additional financing.

There can be no assurance that the Company will ever earn revenues or achieve profitability, or if achieved, that they will be sustained on a continuing basis.

In addition, the manufacturing, clinical and preclinical development activities as well as the commercialization of the Company’s products, if approved, will require significant additional financing.

The Company may be unable to secure such financing when needed, or if available, such financings may be under terms that are unfavorable to the Company or the current stockholders.

If the Company is

unable to raise additional funds when needed, it may be required to delay, reduce the scope of, or eliminate development programs, which may adversely affect its business and operations.

If the Company is unable to raise additional funds when needed, it may be required to delay, reduce the scope of, or eliminate development programs, which may adversely affect its business and operations.

Summary of Significant Accounting Policies

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The financial statements have been prepared in conformity with U.S.

generally accepted accounting principles (U.S.

reference in these notes to applicable guidance is meant to refer to the authoritative U.S.

GAAP as found in the Accounting Standards Codification (ASC), and Accounting Standards Update (ASU), of the Financial Accounting

Standards Board (FASB).

generally accepted accounting principles (“U.S.

GAAP”).

Any reference in these notes to applicable guidance is meant to refer to the authoritative U.S.

GAAP as found in the Accounting Standards Codification (“ASC”), and Accounting Standards Update (“ASU”), of the Financial Accounting Standards Board (“FASB”).

Use of Estimates

The preparation of the Companys financial statements requires it to make estimates and assumptions that impact the reported amounts of assets,

liabilities and expenses in the Companys financial statements and accompanying notes.

The most significant estimates in the Companys financial statements relate to accruals for research and development expenses, valuation of equity

awards, and valuation allowances for deferred tax assets.

These estimates and assumptions are based on current facts, historical experience, future expectations, and various other factors believed to be reasonable under the circumstances, the

results of which form the basis for making judgments about the carrying values of assets and liabilities and the recording of expenses that are not readily apparent from other sources.

Actual results may differ materially and adversely from these

Silverback Therapeutics, Inc.

Notes to Financial Statements

The full extent to which the coronavirus (COVID-19) pandemic

will directly or indirectly impact the Companys business, results of operations and financial condition, including expenses, clinical trials and research and development costs, will depend on future developments that are highly uncertain,

including as a result of new information that may emerge concerning COVID-19 and the actions taken to contain or treat COVID-19, as well as the economic impact on local,

regional, national and international markets.

The Company has considered potential impacts arising from the COVID-19 pandemic and is not presently aware of any events or circumstances that would require the

Company to update its estimates, judgments or revise the carrying value of its assets or liabilities.

The Company has determined that it operates and manages one operating segment, which is the business of developing and commercializing tissue targeted

therapeutics.

The Companys chief operating decision maker, its chief executive officer, reviews financial information on an aggregate basis for the purpose of allocating resources.

The preparation of the Company’s financial statements requires it to make estimates and assumptions that impact the reported amounts of assets, liabilities and expenses in the Company’s financial statements and accompanying notes.

The most significant estimates in the Company’s financial statements relate to accruals for research and development expenses, valuation of equity awards, and valuation allowances for deferred tax assets.

These estimates and assumptions are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and the recording of expenses that are not readily apparent from other sources.

Actual results may differ materially and adversely from these estimates.

The full extent to which the coronavirus (“COVID-19”) pandemic will directly or indirectly impact the Company’s business, results of operations and financial condition, including expenses, clinical trial and research and development costs, will depend on future developments that are highly uncertain, including as a result of new information that may emerge concerning COVID-19 and the actions taken to contain or treat COVID-19, as well as the economic impact on local, regional, national and international markets.

The Company has considered potential impacts arising from the COVID-19 pandemic and is not presently aware of any events or circumstances that would require the Company to update its estimates, judgments or revise the carrying value of its assets or liabilities.

The Company has determined that it operates and manages one operating segment, which is the business of developing and commercializing tissue targeted therapeutics.

The Company’s chief operating decision maker, its chief executive officer, reviews financial information on an aggregate basis for the purpose of allocating resources.

Fair Value of Financial Instruments

Cash and cash equivalents, restricted cash, and investments are carried at fair value.

Accounts payable and accrued expenses are carried at cost, which approximates fair value given their short-term nature.

The term loan payable is carried at cost, which approximates fair value as its effective interest rate approximates current market rates.

Cash and Cash Equivalents

Cash equivalents are

comprised of short-term, highly-liquid investments with maturities of 90 days or less at the date of purchase.

As of December 31, 2020 and 2019, the Companys cash equivalents consisted of money market funds.

Cash equivalents are comprised of short-term, highly-liquid investments with maturities of 90 days or less at the date of purchase.

At December 31, 2021 and December 31, 2020 , the Company’s cash equivalents consisted of money market funds.

Restricted Cash

Restricted cash consists of a deposit

securing a collateral letter of credit issued in connection with the Companys facility operating lease.

The following table provides a

reconciliation of cash and cash equivalents and restricted cash reported within the balance sheets that sum to the amounts shown in the statements of cash flows (in thousands):

Restricted cash consists of a deposit securing a collateral letter of credit issued in connection with the operating lease for the Company’s headquarters.

The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the balance sheets that sum to the amounts shown in the statements of cash flows (in thousands):

Cash and cash equivalents

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Total cash and cash equivalents and restricted cash

The Company invests excess cash in investment grade intermediate-term fixed income securities.

These investments are included in long-term investments on the balance sheets, classified as available-for-sale, and reported at fair value with unrealized gains and losses included in accumulated other comprehensive loss.

Realized gains and losses on the sale of these securities are recognized in net loss.

The Company periodically evaluates whether declines in fair values of its investments below their book value are other-than-temporary.

This evaluation consists of several qualitative and quantitative factors regarding the severity and duration of the unrealized loss as well as the Company’s ability and intent to hold the investment until a forecasted recovery occurs.

Additionally, the Company assesses whether it has plans to sell the security or it is more likely than not it will be required to sell any investment before recovery of its amortized cost basis.

Factors considered include quoted market prices, recent financial results and operating trends, implied values from any recent transactions or offers of investee securities, credit quality of debt instrument issuers, other publicly available information that may affect the value of the investments, duration and severity of the decline in value, and the Company's strategy and intentions for holding the investment.

Concentrations of Credit Risk

The Company is subject to credit risk from holding its cash and cash equivalents at one commercial bank.

The Company limits its exposure to credit

losses by investing in money market funds through a U.S.

bank with high credit ratings.

Cash may consist of deposits held with banks that may at times exceed federally insured limits, however, exposure to credit risk in the event of default by the

financial institution is limited to the extent of amounts recorded on the balance sheets.

The Company has not experienced any losses in such accounts and management believes that the Company is not exposed to significant credit risk due to the

financial position of the depository institutions in which those deposits are held.

Silverback Therapeutics, Inc.

Notes to Financial Statements

Prepaid Expenses and Other Current Assets

Prepaid expenses consist primarily of operating expenses paid in advance.

The Company is subject to credit risk from holding its cash and cash equivalents at a limited number of commercial banks.

The Company limits its exposure to credit losses by investing in money market funds through a U.S.

bank with high credit ratings and U.S.

Treasury securities.

Cash may consist of deposits held with banks that may at times exceed federally insured limits, however, exposure to credit risk in the event of default by the financial institution is limited to the extent of amounts recorded on the balance sheets.

The Company has not experienced any losses in such accounts and management believes that the Company is not exposed to significant credit risk due to the financial position of the depository institutions in which those deposits are held.

Prepaid Expenses and Other Assets

Prepaid expenses consist primarily of operating expenses paid in advance of when services are provided.

Property and Equipment, Net

Property and equipment,

net consists of furniture and fixtures and laboratory equipment and is stated at cost, less accumulated depreciation.

Furniture and fixtures and laboratory equipment are depreciated over the estimated useful lives of the assets (each three to five

years) using the straight-line method.

When assets are retired or otherwise disposed of, the cost and related accumulated depreciation are removed from the balance sheet and the resulting gain or loss is reflected in operations in the period

Property and equipment, net consists of furniture and fixtures and laboratory equipment and is stated at cost, less accumulated

depreciation.

Furniture and fixtures and laboratory equipment are depreciated over the estimated useful lives of the assets (each three to five years) using the straight-line method.

Repairs and maintenance costs are charged to expense as incurred.

Leases consist of the Companys operating lease.

In accordance with ASC 842, Leases , the Company determines if an arrangement is a lease at

inception and evaluates each lease agreement to determine whether the lease is an operating or finance lease.

For leases where the Company is the lessee, right-of-use

(ROU) assets represent the Companys right to use an underlying asset for the lease term and lease liabilities represent an obligation to make lease payments arising from the lease.

ROU assets and lease liabilities are recognized at

the lease commencement date based on the present value of lease payments over the lease term.

The Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease

The operating lease ROU asset also includes any prepaid lease payments, lease incentives received, and costs which will be incurred in exiting a lease.

The Companys lease includes options to extend or terminate the lease.

covered by an option to extend the lease are included in the lease term when it is reasonably certain that the Company will exercise that option.

Periods covered by an option to terminate the lease are included in the lease term when it is

reasonably certain that the Company will not exercise that option.

At the inception of the lease and as of December 31, 2020, the Company was not reasonably certain that it will exercise its option to extend the lease and was not reasonably

certain that it will not exercise its option to terminate the lease, therefore, the periods covered by the options are not included within the lease term.

Short-term leases with an initial term of 12 months or less are not recorded on the balance

Leases consist of the Company’s operating leases.

In accordance with ASC 842, Leases, the Company determines if an arrangement is a lease at inception and evaluates each lease agreement to determine whether the lease is an operating or finance lease.

For leases where the Company is the lessee, right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent an obligation to make lease payments arising from the lease.

ROU assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term.

The Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments.

Operating lease ROU assets also include any prepaid lease payments, lease incentives received, and costs which will be incurred in exiting a lease.

The Company’s leases include options to extend or terminate the leases.

Periods covered by an option to extend a lease are included in the lease term when it is reasonably certain that the Company will exercise that option.

Periods covered by an option to terminate a lease are included in the lease term when it is reasonably certain that the Company will not exercise that option.

Short-term leases with an initial term of 12 months or less are not recorded on the balance sheet.

The Company does not have material short-term lease costs.

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For real estate leases, the Company does not separate lease and non-lease components.

The Companys lease agreements do not contain any material residual value guarantees or material restrictive covenants.

The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants.

Impairment of Long-Lived Assets

Long-lived assets

consist of property and equipment and ROU assets.

These assets are reviewed for impairment whenever facts or circumstances either internally or externally may suggest that the carrying value of an asset or asset group may not be recoverable.

impairment loss is recorded if and when events and circumstances indicate that assets might be impaired and the undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets.

The Company has not

recognized any impairment losses through December 31, 2020.

Silverback Therapeutics, Inc.

Notes to Financial Statements

Long-lived assets consist of property and equipment and ROU assets.

These assets are reviewed for impairment whenever facts

or circumstances either internally or externally may suggest that the carrying value of an asset or asset group may not be recoverable.

An impairment loss is recorded if and when events and circumstances indicate that assets might be impaired and the undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets.

The Company has not recognized any impairment losses through December 31, 2021.

Research and Development Expenses

All research and development costs are expensed in the period incurred.

Research and development expenses consist primarily of direct and indirect costs

incurred in connection with the development of the Companys ImmunoTAC technology platform, discovery efforts, and preclinical study and clinical trial activities related to the Companys program pipeline, including the Companys lead

product candidate, SBT6050.

Direct costs include expenses incurred under agreements with contract research organizations (CROs) and other vendors that conduct the Companys preclinical and clinical activities, expenses associated

with manufacturing the Companys product candidates including under agreements with contract development and manufacturing organizations (CDMOs) and other vendors, and consulting fees.

Indirect costs include personnel-related

expenses, consisting of employee salaries, bonuses, benefits, and stock-based compensation expense and recruiting costs for personnel engaged in research and development activities, facility and equipment related expenses, consisting of indirect and

allocated expenses for rent, depreciation, and equipment maintenance, and other unallocated research and development expenses incurred in connection with the Companys research and development programs, including laboratory materials and

supplies and license fees.

Research and development expenses are charged to operating expenses as incurred when these expenditures relate to the Companys research and development efforts and have no alternative future use.

Research and development expenses consist primarily of direct and indirect costs incurred in connection with the development of the Company’s ImmunoTAC technology platform, discovery efforts, and preclinical study and clinical trial activities related to the Company’s program pipeline.

Direct costs include expenses incurred under agreements with CROs and other vendors that conduct the Company’s preclinical and clinical activities, expenses associated with manufacturing the Company’s product candidates including under agreements with contract development and manufacturing organizations (“CDMOs”) and other vendors, and consulting fees.

Indirect costs include personnel-related expenses, consisting of employee salaries, bonuses, benefits, and stock-based compensation expense and recruiting costs for personnel engaged in research and development activities, facility and equipment related expenses, consisting of indirect and allocated expenses for rent, depreciation, and equipment maintenance, and other unallocated research and development expenses incurred in connection with the Company’s research and development programs, including laboratory materials and supplies and license fees.

Research and development expenses are charged to operating expenses as incurred when these expenditures relate to the Company’s research and development efforts and have no alternative future uses.

The Company is obligated to make upfront payments upon execution of certain research and development agreements.

Advance payments, including

nonrefundable amounts, for goods or services that will be used or rendered for future research and development activities are capitalized until such goods are delivered or the related services are performed, or such time when the Company does not

expect the goods to be delivered or services to be performed.

Advance payments, including nonrefundable amounts, for goods or services that will be used or rendered for future research and development activities are capitalized until such goods are delivered or the related services are performed, or such time when the Company does not expect the goods to be delivered or services to be performed.

The Company estimates the period over which such services will be performed and the level of effort to be expended in each period.

If actual timing of performance or the level of effort

varies from the estimate, the Company will adjust the amounts recorded accordingly.

If actual timing of performance or the level of effort varies from the estimate, the Company will adjust the amounts recorded accordingly.

Since inception, the Company has not experienced any material differences between accrued or prepaid costs and actual costs.

General and Administrative Expenses

administrative expenses consist primarily of personnel-related expenses, including employee salaries, bonuses, benefits, and stock-based compensation, and recruiting costs for personnel in executive, finance, and other administrative functions.

Other significant general and administrative expenses include legal fees relating to intellectual property and corporate matters, professional fees for accounting, tax and consulting services, insurance costs, travel expenses and facility related

General and administrative expenses consist primarily of personnel-related expenses, including employee salaries, bonuses, benefits, and stock-based compensation, and recruiting costs for personnel in executive, finance, and other administrative functions.

General and administrative costs are expensed as incurred.

Stock-Based Compensation

The Company has stock-based compensation plans that are described in Note 9.

As of December 31, 2020, the Company had issued stock options and

permitted eligible employees to participate in an employee stock purchase plan whereby shares of the Companys common stock may be purchased at a discount.

Further discussion of the measurement and expense methodology related to these programs

is described below:

Silverback Therapeutics, Inc.

Notes to Financial Statements

Stock Option Awards

The cost of employee services received in exchange for an award of an equity instrument is measured at the grant date based on the awards estimated

fair value using the Black-Scholes option pricing model.

The cost of employee services received in exchange for an award of an equity instrument is measured at the grant date based on the award’s estimated fair value using the Black-Scholes option pricing model.

The estimated fair value of the awards is recognized into expense on a straight-line basis over the requisite service period.

Stock-based compensation expense for an award with a performance

condition is recognized when the achievement of such performance condition is determined to be probable.

If the outcome of such performance condition is not determined to be probable or is not met, no compensation expense is recognized, and any

previously recognized compensation expense is reversed.

Stock-based compensation expense for an award with a performance condition is recognized when the achievement of such performance condition is determined to be probable.

If the outcome of such performance condition is not determined to be probable or is not met, no compensation expense is recognized, and any previously recognized compensation expense is reversed.

Management evaluates when the achievement of a performance condition is probable based on the expected satisfaction of the performance condition at each reporting date.

Forfeitures are

recognized as a reduction of stock-based compensation expense as they occur.

Forfeitures are recognized as a reduction of stock-based compensation expense as they occur.

The option plan permits, but does not require, the inclusion of early exercise provisions in individual awards.

Proceeds from early option exercises are recorded as a

liability until the underlying restricted shares vest.

Proceeds from early option exercises are recorded as a liability until the underlying restricted shares vest.

While the restricted shares have voting rights, they are not considered outstanding for accounting purposes.

Employee Stock Purchase Plan

In December 2020, the

Companys Employee Stock Purchase Plan (ESPP) became effective, pursuant to which eligible employees can purchase shares of the Companys common stock at a discount to the fair market value at semi-annual intervals.

determining the grant date fair value of shares expected to be purchased under the ESPP, the Company uses the Black-Scholes option pricing model.

In December 2020, the Company’s Employee Stock Purchase Plan (“ESPP”) became effective, pursuant to which eligible employees can purchase shares of the Company’s common stock at a discount to the fair market value at semi-annual intervals.

In determining the grant date fair value of shares expected to be purchased under the ESPP, the Company uses the Black-Scholes option pricing model.

Black-Scholes inputs are determined in the same manner as for stock option awards.

The estimated grant

date fair value of shares expected to be purchased is recognized into expense on a straight-line basis over the requisite service period.

The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and

liabilities for the expected future tax consequences of events that have been included in the financial statements.

Under this method, deferred tax assets and liabilities are determined on the basis of the differences between the financial

statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse.

The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in

the period that includes the enactment date.

The Company recognizes net deferred tax assets to the extent that the Company believes these assets

are more likely than not to be realized.

The estimated grant date fair value of shares expected to be purchased is recognized into expense on a straight-line basis over the requisite service period.

The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements.

Under this method, deferred tax assets and liabilities are determined on the basis of the differences between the financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse.

The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.

The Company recognizes net deferred tax assets to the extent that the Company believes these assets are more likely than not to be realized.

In making such a determination, management considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations.

If management determines that the Company is more likely than not able to realize its deferred tax assets in the future in excess of their net recorded

amount, management would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes in the period in which the adjustment is made.

The Company records uncertain tax positions on the basis of a two-step process whereby (1) management

determines whether it is more likely than not that the tax positions will be sustained on

Silverback Therapeutics, Inc.

Notes to Financial Statements

the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, management

recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.

The Company recognizes interest and penalties related to unrecognized tax benefits within

income tax expense.

If management determines that the Company is more likely than not able to realize its deferred tax assets in the future in excess of their net recorded amount, management would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes in the period in which the adjustment is made.

The Company records uncertain tax positions on the basis of a two-step process whereby (1) management determines whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the recognition threshold, management recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.

The Company recognizes interest and penalties related to unrecognized tax benefits within income tax expense.

Any accrued interest and penalties are included within the related tax liability.

1 unchanged sentence

Comprehensive Loss

Comprehensive loss is defined as a

change in equity during a period from transactions and other events and circumstances from non-owner sources.

The Companys comprehensive loss was equal to net loss for the years ended December 31,

2020 and 2019.

Comprehensive loss is defined as a change in equity during a period from transactions and other events and circumstances from non-owner sources.

The Company presents one continuous Statement of Operations and Comprehensive Loss.

The Company’s comprehensive loss includes unrealized gains and losses on investments.

Net Loss Per Share Attributable to Common Stockholders

Basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the

weighted-average number of shares of common stock outstanding for the period, without consideration of potentially dilutive securities.

Diluted net loss per share attributable to common stockholders is the same as basic net loss per share

attributable to common stockholders since the effect of potentially dilutive securities is anti-dilutive given the net loss of the Company.

For purposes of this calculation, redeemable convertible preferred stock, stock options, employee stock

purchase rights, and unvested common stock subject to repurchase are considered to be common stock equivalents but are not included in the calculations of diluted net loss per share for the periods presented as their effect would be antidilutive.

Basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period, without consideration of potentially dilutive securities.

Diluted net loss per share attributable to common stockholders is the same as basic net loss per share attributable to common stockholders since the effect of potentially dilutive securities is anti-dilutive given the net loss of the Company.

For purposes of this calculation, redeemable convertible preferred stock, stock options, employee stock purchase rights, and unvested common stock subject to repurchase are considered to be common stock equivalents but are not included in the calculations of diluted net loss per share for the periods presented as their effect would be antidilutive.

Emerging Growth Company Status

The Company is an

emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (JOBS Act).

Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of

the JOBS Act until such time as those standards apply to private companies.

The Company has elected to use this extended transition period for complying with certain new or revised accounting standards that have different effective dates for public

and private companies until the earlier of the date that it is (1) no longer an emerging growth company or (2) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act.

As a result, these financial

statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

Adopted Accounting Pronouncements

In August 2018, the FASB issued ASU 2018-13, Fair Value

Measurement (Topic 820):

Disclosure FrameworkChanges to the Disclosure Requirements for Fair Value Measurement .

The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those

fiscal years.

Early adoption is permitted.

The Company adopted ASU 2018-13 on January 1, 2020 and the standard did not have a material impact on its financial statements and related disclosures.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740):

Simplifying the Accounting for

Income Taxes , which simplifies the accounting for income taxes, eliminates certain

Silverback Therapeutics, Inc.

Notes to Financial Statements

exceptions within ASC 740, Income Taxes , and clarifies certain aspects of the current guidance to promote consistency among reporting entities.

The guidance is effective for fiscal years

beginning after December 15, 2021, with early adoption permitted.

The Company adopted ASU 2019-12 on January 1, 2020 and the standard did not have a material impact on its financial statements and

related disclosures.

The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (“JOBS Act”).

Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies.

The Company has elected to use this extended transition period for complying with certain new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that it is (1) no longer an emerging growth company or (2) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act.

As a result, these financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

Recently Issued Accounting Pronouncements Not Yet Adopted

In June 2016, the FASB issued ASU 2016-13, Financial InstrumentsCredit Losses (Topic 326):

of Credit Losses on Financial Instruments .

The objective of the standard is to provide information about expected credit losses on financial instruments at each reporting date and to change how other-than temporary impairments on investment

securities are recorded.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326):

Measurement of Credit Losses on Financial Instruments .

The objective of the standard is to provide information about expected credit losses on financial instruments at each reporting date and to change how other-than temporary impairments on investment securities are recorded.

The guidance is effective for the Company beginning on January 1, 2023, with early adoption permitted.

The Company is currently evaluating the impact the standard may have on its financial statements and related

The Company is currently evaluating the impact the standard may have on its financial statements and related disclosures.

Fair Value Measurements

follows authoritative accounting guidance, which among other things, defines fair value, establishes a consistent framework for measuring fair value, and expands disclosure for each major asset and liability category measured at fair value on either

a recurring or nonrecurring basis.

Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability (at exit price) in the principal or most advantageous market for the asset or liability in an

orderly transaction between market participants on the measurement date.

The Company follows authoritative accounting guidance, which among other things, defines fair value, establishes a consistent framework for measuring fair value, and expands disclosure for each major asset and liability category measured at fair value on either a recurring or nonrecurring basis.

The three levels of inputs that may be used to measure fair value include:

Quoted prices in Active Markets for identical assets or liabilities.

The Companys Level 1

assets consist of money market funds.

Observable inputs other than Level 1 prices, such as

quoted prices for similar assets or liabilities in active markets or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities in active markets or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Unobservable inputs that are supported by little or no market activity.

The following table identifies the Companys assets and liabilities that were measured at fair value on a recurring basis (in thousands):

The following table identifies the Company’s assets and liabilities that were measured at fair value on a recurring basis (in thousands):

December 31, 2021

Amortized Cost

Gross unrealized gains

Gross unrealized losses

Money market funds

Long-term investments - U.S.

Treasury securities

December 31, 2020

Money market funds

There were no transfers between the Level 1 and Level 2 categories or into or out of the Level 3 category

during the years ended December 31, 2020 and 2019.

Silverback Therapeutics, Inc.

Notes to Financial Statements

There were no transfers between the Level 1 and Level 2 categories or into or out of the Level 3 category during the periods presented.

The Company’s long-term investments portfolio contains investments in U.S.

Treasury securities that have an effective maturity date that is more than one year, but less than two years, from the respective balance sheet date.

The Company evaluated its investments for other-than-temporary impairment and considers the decline in market value for the securities to be primarily attributable to current economic and market conditions.

For the investments, it is not more-likely-than-not that the Company will be required to sell the investments, and the Company does not intend to do so prior to the recovery of the amortized cost basis.

Property and Equipment, Net

Property and equipment are summarized as follows (in thousands):

December 31, 2021

December 31, 2020

Furniture and fixtures

1 unchanged sentence

Property and equipment, gross

Less accumulated depreciation and amortization

Property and equipment, net

Depreciation and amortization expense was $0.6 million and $0.5 million for the years ended December 31,

2020 and 2019, respectively.

Less accumulated depreciation

Total property and equipment, net

Depreciation expense was $ 0.8 million and $ 0.6 million for the years ended December 31, 2021 and 2020, respectively.

Accrued Expenses

Accrued expenses consisted of the following (in thousands):

December 31, 2021

December 31, 2020

Research and development expenses

2 unchanged sentences

Total accrued expenses

The Company leases

an office and laboratory space in Seattle, Washington.

The Company leases office and laboratory space in Seattle, Washington.

The components of lease expense and related cash flows were as follows (in thousands):

Years Ended December 31,

Lease expense

3 unchanged sentences

Operating cash outflows from operating leases

The remaining term on the Companys lease was 1.8 years and 2.8 years as of December 31, 2020 and 2019,

respectively.

To compute the present value of the lease liability, the Company used a discount rate of 8.5%.

Silverback Therapeutics, Inc.

Notes to Financial Statements

Future minimum commitments due under the operating lease agreement as of December 31, 2020 are as

follows (in thousands):

Year Ending December 31,

On July 1, 2021, the Company entered into a sublease agreement for additional office space in Seattle, Washington.

The commencement date of the sublease was August 1, 2021.

The contractual term of the sublease is two years with an option to extend for one additional year and an option to terminate after one year subject to a termination fee .

The annual minimum rent payable by the Company under the sublease is $ 0.3 million annually.

The ROU asset obtained in exchange for the new operating lease liability was $ 0.6 million as of the lease commencement date.

The weighted-average remaining term on the Company's leases was 4.7 years and 1.8 years as of December 31, 2021 and 2020, respectively.

To compute the present value of the lease liabilities, the Company used weighted average discount rates of 7.5 % and 8.5 % as of December 31, 2021 and 2020, respectively.

During the year ended December 31, 2021, there was a change in the expected lease term of the Company’s Seattle, Washington headquarters, whereby the Company became reasonably certain that it will not exercise its option to terminate the lease.

As a result, the ROU asset and lease liability were remeasured using the present value of the remaining lease payments.

The re-measurement resulted in an addition to the ROU asset and lease liability of $ 3.1 million.

The change in the expected lease term has no effect on the classification of the lease.

Future minimum commitments due under the operating lease agreements as of December 31, 2021 are as follows (in thousands):

Years Ended December 31,

Total undiscounted lease payments

1 unchanged sentence

Total present value of lease payments

Convertible Notes and Other Debt

Convertible Notes

In October 2019, the Company issued

convertible promissory notes for proceeds of $10.0 million.

The notes were unsecured, bore an interest rate of 3% per year, and had a maturity date of March 31, 2020.

On March 4, 2020, these notes and accrued interest of

$0.1 million converted into 4,673,388 shares of the Companys Series B redeemable convertible preferred stock at the Series B redeemable convertible preferred stock issuance price of $2.16 per share.

Term Loan Payable

In November 2016, the Company

entered into a loan and security agreement with Silicon Valley Bank (SVB) that allowed borrowings up to $5.0 million in two tranches.

$3.5 million was immediately drawn as a term loan by the Company.

In conjunction with the term loan, SVB

received a warrant to purchase 7,601 shares of the Companys common stock with an exercise price of $2.31 per share.

The warrant was recorded as a discount to the loan and an increase in additional

paid-in capital.

In December 2020, the warrant was exercised in full.

Under the terms of the agreement, the

Company was able to draw an additional $1.5 million through a second tranche before December 31, 2017 if it met certain financing milestones.

SVB was eligible to receive an additional warrant contingent upon the Companys draw of this

additional tranche.

However, in December 2017, the Company amended the loan and security agreement to extend the second tranche draw window to March 31, 2018.

This tranche expired undrawn.

In exchange for the extension, SVB received an

additional warrant to purchase 1,553 shares of the Companys common stock with an exercise price of $2.42 per share and, because the tranche expired undrawn, an unused term loan fee.

Neither the additional warrant to purchase common stock or

the unused term loan fee were material to the financial statements.

In December 2020, the warrant was exercised in full.

The outstanding principal

amount of the term loan accrues interest at an annual rate of 1.75% per annum.

At closing, the Company incurred de minimis debt issuance costs and owed a final payment fee of $0.3 million, both of which are amortized to interest expense over

the remaining term of the debt under the effective interest method.

The effective interest rate of the Companys term loan is 5.14%.

Interest expense under the term loan was not material to the financial statements for the year ended

December 31, 2020 and totaled $0.1 million for the year ended December 31, 2019.

Silverback Therapeutics, Inc.

Notes to Financial Statements

The term loan is collateralized by the Companys tangible and intangible assets, excluding

intellectual property.

The proceeds are to be used as working capital and to fund general business requirements.

The agreement includes customary nonfinancial covenants and events of default that include, among other things, non-payment, inaccuracy of representations and warranties, covenant breaches, cross default to material indebtedness or material agreements, bankruptcy and insolvency, material judgments, a change of control, or any

material adverse event.

The Company was in compliance with all related covenants as of December 31, 2020 and 2019.

Given the existence of a subjective acceleration clause, all amounts due to SVB are classified as a current liability at

December 31, 2020 and 2019, though SVB has not accelerated any amounts due under the debt agreement.

The term loans original maturity

date was November 1, 2020.

In November 2016, the Company entered into a loan and security agreement with Silicon Valley Bank (“SVB”) and borrowed $ 3.5 million as a term loan.

The outstanding principal amount of the term loan accrued interest at an annual rate of 1.75 % per annum.

At closing, the Company incurred de minimis debt issuance costs and owed a final payment fee of $ 0.3 million, both of which are amortized to interest expense over the remaining term of the debt under the effective interest method.

The effective interest rate of the Company’s term loan was 5.14 %.

The term loan’s original maturity date was November 1, 2020 .

However, in April 2020, the Company amended the loan and security agreement to defer principal payments for six months and extend the maturity date to May 1, 2021 .

There were no costs or additional warrant

issuances in connection with this amendment.

The Company accounted for the amendment as a debt modification and is amortizing the remaining debt discount over the remaining term.

Redeemable Convertible Preferred Stock and Stockholders Equity (Deficit)

There were no costs or additional warrant issuances in connection with this amendment.

The Company accounted for the amendment as a debt modification and amortized the remaining debt discount over the remaining term.

On May 1, 2021, the Company made its final scheduled payment to SVB under the loan and security agreement including the final payment fee.

Stockholders’

Equity (Deficit)

Authorized Shares

In connection with the completion of

the Companys IPO in December 2020, the Company amended its Certificate of Incorporation to authorize 200,000,000 shares of common stock, par value $0.0001 per share, and 10,000,000 shares of preferred stock, par value $0.0001 per share.

The Company’s current Amended and Restated Certificate of Incorporation authorizes 200,000,000 shares of common stock, par value $ 0.0001 per share, and 10,000,000 shares of preferred stock, par value $ 0.0001 per share.

Redeemable Convertible Preferred Stock

conversion to common stock, the Companys redeemable convertible preferred stock was classified as mezzanine equity on the Companys balance sheets as the shares are contingently redeemable upon a deemed liquidation such as a change in

control and in that event, there is no guarantee that all stockholders would be entitled to receive the same form of consideration.

No accretion to redemption value was recorded during the years ended December 31, 2020 and 2019 as a deemed

liquidation event was not considered probable.

The Company did not issue any redeemable convertible preferred stock during the year ended

December 31, 2019.

Prior to its conversion to common stock in December 2020, the Company’s redeemable convertible preferred stock was classified as mezzanine equity on the Company’s balance sheets as the shares are contingently redeemable upon a deemed liquidation such as a change in control and in that event, there is no guarantee that all stockholders would be entitled to receive the same form of consideration.

No accretion to redemption value was recorded during the year ended December 31, 2020 as a deemed liquidation event was not considered probable.

During the year ended December 31, 2020, the Company issued convertible preferred stock as follows:

In March 2020, the

Company issued 14,701,054 shares of its Series B redeemable convertible preferred stock, including 4,673,388 shares issued upon conversion of then outstanding convertible notes and accrued interest, and 10,027,666 shares issued for cash at a

purchase price of $2.16 per share, resulting in gross proceeds of $21.5 million.

The Series B purchase agreement provides that the Company will issue, and the Series B holders will purchase, an additional 21,732,862 shares of the Companys

Series B redeemable convertible preferred stock across two tranches for aggregate proceeds of $46.9 million in the event that certain agreed upon milestones are achieved or the preferred majority approves their closing.

The future Series B

tranches did not meet the definition of freestanding instruments or the definition of derivatives, therefore, they were not accounted for separately or bifurcated.

Silverback Therapeutics, Inc.

Notes to Financial Statements

In July 2020, the Company issued 10,669,834 shares of its Series B redeemable convertible preferred

stock for cash at a purchase price of $2.16 per share, resulting in gross proceeds of $23.0 million.

In September 2020, the Company issued

11,063,028 additional shares of its Series B redeemable convertible preferred stock for cash at a purchase price of $2.16 per share, resulting in gross proceeds of $23.9 million, and 24,926,685 shares of its Series C redeemable convertible

preferred stock for cash at a purchase price of $3.41 per share, resulting in gross proceeds of $84.9 million.

In March 2020, the Company issued 14,701,054 shares of its Series B redeemable convertible preferred stock, including 4,673,388 shares issued upon conversion of then outstanding convertible notes and accrued interest, and 10,027,666 shares issued for cash at a purchase price of $ 2.16 per share, resulting in gross proceeds of $ 21.5 million.

The Series B purchase agreement provided that the Company would issue, and the Series B holders would purchase, an additional 21,732,862 shares of the Company’s Series B redeemable convertible preferred stock across two tranches for aggregate proceeds of $ 46.9 million in the event that certain agreed upon milestones were achieved or the preferred majority approved their closing.

The Series B tranches did not meet the definition of freestanding instruments or the definition of derivatives, therefore, they were not accounted for separately or bifurcated.

On July 1, 2020, the Company issued 10,669,834 shares of its Series B redeemable convertible preferred stock for cash at a purchase price of $ 2.16 per share, resulting in gross proceeds of $ 23.0 million.

In September 2020, the Company issued 11,063,028 additional shares of its Series B redeemable convertible preferred stock for cash at a purchase price of $ 2.16 per share, resulting in gross proceeds of $ 23.9 million, and 24,926,685 shares of its Series C redeemable convertible preferred stock for cash at a purchase price of $ 3.41 per share, resulting in gross proceeds of $ 84.9 million.

The Series C purchase agreement did not contain any embedded features that meet the definition of freestanding instruments or the definition of derivatives, therefore, they were not accounted for separately or bifurcated.

The Company has reserved shares of common stock for the following potential future issuances:

Conversion of outstanding redeemable convertible preferred stock

Shares underlying outstanding equity awards

1 unchanged sentence

Shares underlying early exercised equity awards

Exercise of common stock warrants

Shares underlying ESPP withholdings

Stock-Based Compensation

Stock-based compensation expense recognized for all equity awards has been reported in the statements of operations and comprehensive loss as follows (in

Stock-based compensation expense recognized for all equity awards has been reported in the statements of operations and comprehensive loss as follows (in thousands):

Years Ended December 31,

Research and development expense

1 unchanged sentence

Total stock-based compensation expense

As of December 31, 2020, the total unrecognized stock-based compensation expense was $60.8 million, which is

expected to be recognized over a remaining weighted-average period of approximately 3.4 years.

Stock-based compensation expense includes October

2020 and November 2020 grants that were originally granted with a strike price based upon the estimated grant date fair market value of our common stock as a private company;

however, when determining the Black-Scholes value of these stock options,

we utilized the public offering price of $21.00 per share as the estimated grant date fair market value of common stock.

Silverback Therapeutics, Inc.

Notes to Financial Statements

As of December 31, 2021 , the total unrecognized stock-based compensation expense was $ 50.5 million, which is expected to be recognized over a remaining weighted-average period of approximately 2.49 years.

Stock Option Awards

In November 2020, the Companys board of directors and stockholders approved the 2020 Equity Incentive Plan (the 2020 Plan).

Plan became effective upon the date of the underwriting agreement related to the IPO.

Upon adoption of the 2020 Plan, the Company restricted future grants from its 2016 Equity Incentive Plan, as amended (the 2016 Plan).

Under the 2020 Plan, the Company may grant stock options, stock appreciation rights, restricted stock, restricted stock units, performance stock awards,

performance cash awards and other forms of stock awards to employees, directors, and consultants, including employees and consultants of the Companys affiliates.

A total of 4,132,681 new shares of common stock were initially reserved for

issuance under the 2020 Plan.

The number of shares reserved under the 2020 Plan also includes 67,319 shares of common stock that remained available for issuance under the 2016 Plan at the time the 2020 Plan became effective and will be increased by

the number of shares under the 2016 Plan that are repurchased, forfeited, expired or cancelled on or after the effective date of the 2020 Plan.

In addition, the number of shares of common stock available for issuance under the 2020 Plan will

automatically increase on January 1 of each calendar year, starting on January 1, 2021 through January 1, 2030, in an amount equal to 5% of the total number of shares of Common Stock outstanding on December 31 of the preceding

year, or a lesser number of shares determined by the Companys board of directors.

As of December 31, 2020, the Companys plans

authorized a total of 7,824,721 shares, of which 1,506,806 shares are available for future grant, and 6,316,569 shares are outstanding.

Not included in the outstanding option balance are 100,263 shares pursuant to stock options that were early

exercised and subject to repurchase under the 2016 Plan that remain unvested as of December 31, 2020.

As of December 31, 2020, the

Company has granted stock options under its equity incentive plans.

Stock options granted under these plans expire no later than 10 years from the date of grant and generally vest over a four year period, with vesting either occurring at a rate of

25% at the end of the first and thereafter in 36 equal monthly installments or on a monthly basis.

In the case of awards granted to our non-employee board members, vesting generally occurs on a monthly basis over three years.

The Company issues new

shares of common stock upon the exercise of stock options.

A summary of the Companys stock option activity for the year ended

December 31, 2020 is as follows (in thousands, except share and per share data and years):

As of December 31, 2021 , the Company’s equity incentive plans authorized a total of 9,564,798 shares, of which 2,931,012 shares are available for future grant, and 6,370,873 shares are outstanding.

Not included in the outstanding option balance are 26,283 shares pursuant to stock options that were early exercised and subject to repurchase that remain unvested as of December 31, 2021.

Stock options granted under the Company’s equity incentive plans expire no later than 10 years from the date of grant and generally vest over a four year period, with vesting either occurring at a rate of 25 % at the end of the first and thereafter in 36 equal monthly installments or on a monthly basis.

In the case of awards granted to our non-employee board members, vesting generally occurs on a monthly basis over three years or in full on an annual basis.

The Company issues new shares of common stock upon the exercise of stock options.

A summary of the Company’s stock option activity for the year ended December 31, 2021 is as follows (in thousands, except share and per share data and years):

Stock Options Outstanding

2 unchanged sentences

Vested at December 31, 2021

Silverback Therapeutics, Inc.

Notes to Financial Statements

The total fair value of shares vested during the years ended December 31, 2020 and 2019 was

$1.1 million and $0.1 million, respectively.

The aggregate intrinsic value in the table above is calculated as the difference between the exercise price of the underlying options and the estimated fair value of the Companys common

stock for all options that were in-the-money at December 31, 2020.

The aggregate intrinsic value in the table above is calculated as the difference between the exercise price of the underlying options and the estimated fair value of the Company’s common stock for all options that were in-the-money at December 31, 2021.

The aggregate intrinsic value of options exercised during the years ended December 31, 2021 and 2020 was $ 7.7 million and $ 0.1 million, respectively.

The weighted-average grant date fair value per share of option grants for the years ended December 31, 2021 and 2020 was $ 22.15 and $ 10.50 , respectively.

The total fair value of shares vested during the years ended December 31, 2021 and 2020 was $ 17.0 million and $ 1.1 million, respectively.

The grant date fair value of stock options was estimated using a Black-Scholes option pricing model with the following weighted-average assumptions:

Years Ended December 31,

Expected term (in years)

5 unchanged sentences

Fair Value of Common Stock .

The grant date

fair market value of the shares of common stock underlying stock options is determined by the Companys board of directors.

Following the closing of the Companys IPO, the fair market value of our common stock is based on its closing price

as reported on the date of grant on the primary stock exchange on which the Companys common stock is traded.

Prior to the Companys IPO, because there was no public market for the Companys common stock, the board of directors

exercised reasonable judgment and considered a number of objective and subjective factors to determine the best estimate of the fair market value, which included contemporaneous valuations performed by an independent third-party, the Companys

results of operations and financial position, including its levels of available capital resources, its stage of development and material risks related to the Companys business, progress of the Companys research and development

activities, the Companys business conditions and projections, the lack of marketability of the Companys common stock and preferred stock as a private company, the prices at which the Company sold shares of its redeemable convertible

preferred stock to outside investors in arms-length transactions, the rights, preferences and privileges of the Companys redeemable convertible preferred stock relative to those of its common stock, the analysis of IPOs and the market

performance of similar companies in the biopharmaceutical industry, the likelihood of achieving a liquidity event for the Companys securityholders, such as an IPO or a sale of the company, given prevailing market conditions, the hiring of key

personnel and the experience of management, trends and developments in the Companys industry and external market conditions affecting the life sciences and biotechnology industry sectors.

Prior to the Company's initial public offering in 2020, the grant date fair market value of the shares of common stock underlying stock options was determined by the Company’s board of directors.

Following the closing of the Company’s IPO, the fair market value of the Company's common stock is based on its closing price as reported on the date of grant on the primary stock exchange on which the Company’s common stock is traded.

Prior to the Company’s IPO, because there was no public market for the Company’s common stock, the board of directors exercised reasonable judgment and considered a number of objective and subjective factors to determine the best estimate of the fair market value, which included contemporaneous valuations performed by an independent third-party, the Company’s results of operations and financial position, including its levels of available capital resources, its stage of development and material risks related to the Company’s business, progress of the Company’s research and development activities, the Company’s business conditions and projections, the lack of marketability of the Company’s common stock and preferred stock as a private company, the prices at which the Company sold shares of its redeemable convertible preferred stock to outside investors in arms-length transactions, the rights, preferences and privileges of the Company’s redeemable convertible preferred stock relative to those of its common stock, the analysis of IPOs and the market performance of similar companies in the biopharmaceutical industry, the likelihood of achieving a liquidity event for the Company’s securityholders, such as an IPO or a sale of the company, given prevailing market conditions, the hiring of key personnel and the experience of management, trends and developments in the Company’s industry and external market conditions affecting the life sciences and biotechnology industry sectors.

Expected Term .

The expected term represents the period that the options granted are expected to be outstanding.

The expected term

of stock options issued is determined using the simplified method (based on the mid-point between the vesting date and the end of the contractual term) as the Company has concluded that its stock option exercise history does not provide a reasonable

basis upon which to estimate expected term.

Silverback Therapeutics, Inc.

Notes to Financial Statements

The expected term of stock options issued is determined using the simplified method (based on the mid-point between the vesting date and the end of the contractual term) as the Company has concluded that its stock option exercise history does not provide a reasonable basis upon which to estimate expected term.

Expected Volatility .

Given the Companys limited historical stock price

volatility data, the Company derived the expected volatility from the average historical volatilities over a period approximately equal to the expected term of comparable publicly traded companies within its peer group that were deemed to be

representative of future stock price trends as the Company has limited trading history for its common stock.

The Company will continue to apply this process until a sufficient amount of historical information regarding the volatility of its own

stock price becomes available.

Given the Company’s limited historical stock price volatility data, the Company derived the expected volatility from the average historical volatilities over a period approximately equal to the expected term of comparable publicly traded companies within its peer group that were deemed to be representative of future stock price trends as the Company has limited trading history for its common stock.

The Company will continue to apply this process until a sufficient amount of historical information regarding the volatility of its own stock price becomes available.

Risk-free Interest Rate .

The risk-free interest rate is based on the U.S.

Treasury rate, with

maturities similar to the expected term of the stock options.

Treasury rate, with maturities similar to the expected term of the stock options.

Expected Dividend Yield .

The Company has never paid

dividends on its common stock and does not anticipate paying any dividends in the foreseeable future.

The Company has never paid dividends on its common stock and does not anticipate paying any dividends in the foreseeable future.

Therefore, the Company uses an expected dividend yield of zero.

Employee Stock Purchase Plan

In November 2020, the

Companys board of directors and stockholders approved and adopted the 2020 ESPP.

The ESPP became effective immediately prior to the date of the underwriting agreement related to the IPO.

The ESPP permits eligible employees who elect to

participate in an offering under the ESPP to have up to 15% of their eligible earnings withheld, subject to certain limitations, to purchase shares of common stock pursuant to the ESPP.

The price of common stock purchased under the ESPP is equal to

85 percent of the lower of the fair market value of the common stock at the commencement date of each offering period or the relevant date of purchase.

A total of 350,000 shares of common stock were initially reserved for issuance under the

In addition, the number of shares of common stock available for issuance under the ESPP will automatically increase on January 1 of each calendar year, starting on January 1, 2021 through January 1, 2030, in an amount equal to

the lesser of (i) 1% of the total number of shares of the Companys common stock outstanding on December 31st of the preceding calendar year, and (ii) 700,000 shares of the Companys common stock, or a lesser number of shares determined by

the Companys board of directors.

As of December 31, 2020, no shares were issued under the ESPP.

The weighted average per share fair

value rights granted during the year ended December 31, 2020 was $10.28.

In determining the grant date fair value of shares to be issued under

the ESPP, the Company uses the Black-Scholes option pricing model.

In November 2020, the Company’s board of directors and stockholders approved and adopted the 2020 ESPP.

The ESPP permits eligible employees who elect to participate in an offering under the ESPP to have up to 15 % of their eligible earnings withheld, subject to certain limitations, to purchase shares of common stock pursuant to the ESPP.

The price of common stock purchased under the ESPP is equal to 85% of the lower of the fair market value of the common stock at the commencement date of each offering period or the relevant date of purchase.

As of December 31, 2021, a total of 698,015 shares were reserved under the ESPP, of which 627,185 shares are available for future issuance and 70,830 shares have been issued.

The weighted average per share fair value rights granted during the year ended December 31, 2021 was $ 15.95 .

In determining the grant date fair value of shares to be issued under the ESPP, the Company uses the Black-Scholes option pricing model.

The Black-Scholes inputs are determined in the same manner as for stock option awards.

The weighted average inputs used for the ESPP for the year ended December 31, 2020, were

The weighted average inputs used for the ESPP for the year ended December 31, 2021, were as follows:

Years Ended December 31,

Expected term (in years)

2 unchanged sentences

Expected dividend yield

Silverback Therapeutics, Inc.

Notes to Financial Statements

The Companys effective tax rates for the years ended December 31, 2020 and 2019 differ from the U.S.

federal statutory rate as follows (in

The Company’s effective tax rates for the years ended December 31, 2021 and 2020 differ from the U.S.

federal statutory rate as follows (in thousands):

Years Ended December 31,

Tax at the federal statutory rate

1 unchanged sentence

Stock-based compensation

Non-deductible executive compensation

Other temporary and permanent differences

1 unchanged sentence

Total provision for income taxes

The significant components of the Companys deferred tax assets and liabilities were as follows (in thousands):

The significant components of the Company’s deferred tax assets and liabilities were as follows (in thousands):

Years Ended December 31,

Deferred tax assets:

2 unchanged sentences

R&D tax credit carryforward

Share-based compensation

Other deferred tax assets

3 unchanged sentences

Net deferred tax assets

At December 31, 2020, the Company had net operating loss carryforwards for income tax purposes of approximately

$89.7 million.

At December 31, 2021, the Company had net operating loss carryforwards for income tax purposes of approximately $ 160.3 million.

If not used, $ 18.2 million of this carryforward will begin to expire in 2036 and $ 142.1 million has no expiration.

At December 31, 2020, the Company also had research and development tax credits of approximately

$1.5 million which will begin to expire in 2037 if left unused.

At December 31, 2021, the Company also had research and development tax credits of approximately $ 2.7 million which will begin to expire in 2037 if left unused.

The Company did not have any foreign tax provision and did not generate material net operating losses in any states with an income tax.

FASB ASC 740 requires that the tax benefit of net operating losses, temporary differences, and credit carryforwards be recorded as an asset to the

extent that management assesses the realization is more likely than not. Realization of the future tax benefits from the net operating losses or credit carryforwards, if any, is dependent on the Companys ability to generate

sufficient taxable income within the applicable carryforward period.

Because of the Companys recent history of operating losses, the Company maintains a full valuation allowance in the amount of $20.9 million and $13.7 million for

the years ended December 31, 2020 and 2019, respectively.

FASB ASC 740 requires that the tax benefit of net operating losses, temporary differences, and credit carryforwards be recorded as an asset to the extent that management assesses the realization is “more likely than not.”

Realization of the future tax benefits from the net operating losses or credit carryforwards, if any, is dependent on the Company’s ability to generate sufficient taxable income within the applicable carryforward period.

Because of the Company’s recent history of operating losses, the Company maintains a full valuation allowance in the amount of $ 39.0 million and $ 20.9 million for the years ended December 31, 2021 and 2020, respectively.

The Company may have already experienced one or more ownership changes.

the timing of any future utilization of its carryforwards, the Company may be limited as to the amount that

Silverback Therapeutics, Inc.

Notes to Financial Statements

can be utilized each year as a result of such previous ownership changes.

Depending on the timing of any future utilization of its carryforwards, the Company may be limited as to the amount that can be utilized each year as a result of such previous ownership changes.

However, the Company does not believe such limitations will cause its carryforwards to expire unutilized.

Future changes in the Companys stock ownership as well as other changes that may be outside the Companys control could potentially result in

further limitations on the Companys ability to utilize its net operating loss and tax credit carryforwards.

As of December 31, 2020 and

2019, the Company did not have any liabilities for unrecognized income tax benefits associated with uncertain tax positions, including any interest and penalties.

Future changes in the Company’s stock ownership as well as other changes that may be outside the Company’s control could potentially result in further limitations on the Company’s ability to utilize its net operating loss and tax credit carryforwards.

As of December 31, 2021 and 2020, the Company did no t have any liabilities for unrecognized income tax benefits associated with uncertain tax positions, including any interest and penalties.

Licensing Agreement

Cell Line License Agreement with WuXi

Biologics (Hong Kong) Limited

In October 2019, the Company entered into a cell line license agreement with WuXi Biologics (Hong Kong)

Limited (WuXi Bio).

Under the license agreement, WuXi Bio granted the Company a non-exclusive, worldwide, sublicensable, under certain of WuXi Bios intellectual property rights, know-how and biological materials (WuXi Bio Licensed Technology), to make, use, sell, offer for sale and import a product developed through the use of the WuXi Bio Licensed Technology (WuXi Bio

Licensed Product).

The WuXi Bio Licensed Technology is currently used to manufacture a component of the Companys lead product, SBT6050.

In consideration for the license, the Company paid WuXi Bio a license fee of $100,000 which was recorded as research and development expense in 2019

accordance with ASC 730.

In 2020 we incurred an additional license fee of $50,000 to WuXi Bio which was recorded in research and development expense in 2020.

In the event the Company manufactures its commercial supplies of a product produced by the

Licensed Cell Line using a manufacturer other than WuXi Bio or its affiliates, the Company will become obligated to pay WuXi Bio aggregate milestone payments, upon achievement of certain sales milestones, of up to $10.8 million.

The Company has the right to terminate the license by giving at least six months prior written notice to WuXi Bio and paying all amounts due to them

through the termination date.

In the event the Company fails to pay all amounts due to WuXi Bio under the license agreement, and fails to pay the amounts within 30 days after receiving written notice of such failure, WuXi Bio may terminate the

license with 45 days written notice to the Company.

In the event either party commits a material breach under the license and fails to cure the breach within 30 days after receiving written notice from the other party of such breach, either party

may terminate the license immediately upon written notice to the other party.

Cell Line License Agreement with WuXi Biologics (Hong Kong) Limited

In October 2019, the Company entered into a cell line license agreement with WuXi Biologics (Hong Kong) Limited (“WuXi Bio”).

Under the license agreement, WuXi Bio granted the Company a non-exclusive, worldwide, sublicensable, under certain of WuXi Bio’s intellectual property rights, know-how and biological materials (“WuXi Bio Licensed Technology”), to make, use, sell, offer for sale and import a product developed through the use of the WuXi Bio Licensed Technology (“WuXi Bio Licensed Product”).

The WuXi Bio Licensed Technology is currently used to manufacture a component of the Company’s ImmunoTAC platform.

The Company has paid an aggregate of $ 150,000 in license fees that were recorded in research and development expense when incurred.

In the event the Company manufactures its commercial supplies of a product produced by the Licensed Cell Line using a manufacturer other than WuXi Bio or its affiliates, the Company will become obligated to pay WuXi Bio aggregate milestone payments, upon achievement of certain sales milestones, of up to $ 10.8 million.

The Company has the right to terminate the license by giving at least six months prior written notice to WuXi Bio and paying all amounts due to them through the termination date.

In the event either party commits a material breach under the license and fails to cure the breach within 30 days after receiving written notice from the other party of such breach, either party may terminate the license immediately upon written notice to the other party.

Commitments and Contingencies

Legal Proceedings

From time to time, the Company may

have certain contingent liabilities that arise in the ordinary course of its business activities.

From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of its business activities.

The Company accrues a liability for such matters when it is probable that future expenditures will be made and can be reasonably estimated.

judgment is required to determine both probability and the estimated amount.

Silverback Therapeutics, Inc.

Notes to Financial Statements

Significant judgment is required to determine both probability and the estimated amount.

On November 5, 2021, a securities class action complaint was filed against the Company and certain of the Company's officers and directors in the U.S.

District for the Western District of Washington, captioned Dresner v.

Silverback Therapeutics, Inc., et al., Case No.

2:21-cv-01499.

The complaint alleges that between December 3, 2020 and September 10, 2021, the Company and certain of the Company's officers and directors violated (1) Sections 11 and 15 of the Securities Act of 1933, as amended;

and (2) Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and Securities and Exchange Commission (“SEC”) Rule 10b-5 promulgated thereunder, by making allegedly false and misleading statements in various SEC filings and press releases regarding the clinical and commercial prospects of the Company’s product candidate, SBT6050, which is now discontinued.

The complaint seeks unspecified damages and interest, as well as attorneys’

fees and other costs.

The court recently appointed lead plaintiff and lead plaintiff's counsel.

The Company and the other defendants have not yet filed a response to the complaint, and do not anticipate doing so until after the filing of an amended complaint.

The Company cannot predict the outcome of this suit, and failure by the Company to obtain a favorable resolution could have a material adverse effect on its business, results of operations and financial condition.

The Company’s chances of success on the merits are still uncertain and any possible loss or range of loss cannot be reasonably estimated and as such the Company has not recorded a liability as of December 31, 2021.

Indemnifications

In the ordinary course of business, the Company enters into agreements that may include indemnification provisions.

Pursuant to such agreements, the

Company may indemnify, hold harmless, and defend an indemnified party for losses suffered or incurred by the indemnified party.

Pursuant to such agreements, the Company may indemnify, hold harmless, and defend an indemnified party for losses suffered or incurred by the indemnified party.

Some of the provisions will limit losses to those arising from third party actions.

In some cases, the indemnification

will continue after the termination of the agreement.

In some cases, the indemnification will continue after the termination of the agreement.

The maximum potential amount of future payments the Company could be required to make under these provisions is not determinable.

The Company has never incurred material costs to defend lawsuits

or settle claims related to these indemnification provisions.

The Company intends to enter into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that

may arise by reason of their status or service as directors or officers to the fullest extent permitted by Delaware corporate law.

The Company currently has directors and officers insurance coverage that reduces its exposure and enables

the Company to recover a portion of any future amounts paid.

The Company has never incurred material costs to defend lawsuits or settle claims related to these indemnification provisions or related to any indemnification agreements.

The Company has entered into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers to the fullest extent permitted by Delaware corporate law.

The Company currently has directors’

and officers’

insurance coverage that reduces its exposure and enables the Company to recover a portion of any future amounts paid.

The Company believes the estimated fair value of these indemnification agreements in excess of applicable insurance coverage is minimal.

global COVID-19 pandemic continues to rapidly evolve, and management continue to monitor the situation closely.

The extent of the impact of COVID-19 on the

Companys business, operations and clinical development timelines and plans remains uncertain, and will depend on certain developments, including the duration and spread of the outbreak and its impact on the Companys clinical trial

enrollment, trial sites, CROs, third-party manufacturers, and other third parties with whom the Company does business, as well as its impact on regulatory authorities and the Companys key scientific and management personnel.

impact of the COVID-19 pandemic or a similar health epidemic is highly uncertain and subject to change.

To the extent possible, management is conducting business as usual, with necessary or advisable

modifications to employee travel and most of the Companys non-lab based employees working remotely.

Management will continue to actively monitor the rapidly evolving situation related to COVID-19 and may take further actions that alter Company operations, including those that may be required by federal, state or local authorities, or that management determines are in the best interests of the

Companys employees and other third parties with whom the Company does business.

At this point, the extent to which the COVID-19 pandemic may affect the Companys business, operations and clinical

development timelines and plans, including the resulting impact on Company expenditures and capital needs, remains uncertain and is subject to change.

Related Party Transactions

The Company reimburses certain travel expenses incurred by one of its investors to support the business.

to the investor totaled less than $0.1 million as of December 31, 2020 and 2019.

Reimbursable travel expenses incurred by the investor totaled less than $0.1 million during each of the years ended December 31, 2020 and 2019.

The global COVID-19 pandemic continues to rapidly evolve, and management continue to monitor the situation closely.

The extent of the impact of COVID-19 on the Company’s business, operations, planned preclinical studies and clinical trials, and manufacturing timelines and plans remains uncertain, and will depend on certain developments, including the duration and spread of the outbreak and its impact on the Company’s CROs, third-party manufacturers, supply chains necessary for research and development and manufacturing, and other third parties with whom the Company does business, as well as its impact on regulatory authorities and the Company’s key scientific and management personnel.

For example, the COVID-19 pandemic has caused the cost of obtaining animals for our preclinical studies to increase dramatically and, if the shortage continues, could also result in delays to our development timelines.

To the extent possible, management is conducting business as usual, with necessary or advisable modifications to employee travel and some of the Company’s non-lab based employees working remotely.

At this point, the extent to which the COVID-19 pandemic may further affect the Company’s business, operations and clinical development timelines and plans, including the resulting impact on Company expenditures and capital needs, remains uncertain and is subject to change.

Employee Benefit Plans

The Company maintains a

retirement plan, which is qualified under section 401(k) of the Internal Revenue Code of 1986, as amended, for the Companys U.S.

The plan allows eligible

Silverback Therapeutics, Inc.

Notes to Financial Statements

employees to defer, at the employees discretion, pretax compensation up to the IRS annual limits.

The Company does not match contributions made by employees.

The Company maintains a retirement plan, which is qualified under section 401(k) of the Internal Revenue Code of 1986, as amended, for the Company’s U.S.

The plan allows eligible employees to defer, at the employee’s discretion, pretax compensation up to the IRS annual limits.

The Company did not match contributions made by employees through December 31, 2021.

The Company began matching 4 % of employee contributions in 2022.

Net Loss Per Share Attributable to Common Stockholders

The following outstanding shares of potentially dilutive securities were excluded from the computation of the diluted net loss per share attributable to

common stockholders for the periods presented because their effect would have been anti-dilutive:

Year Ended December 31,

Redeemable convertible preferred stock

The following outstanding shares of potentially dilutive securities were excluded from the computation of the diluted net loss per share attributable to common stockholders for the periods presented because their effect would have been anti-dilutive:

As of December 31,

Common stock options

Unvested common stock

Common stock warrants

ESPP withholdings

Total potentially dilutive shares

Changes in and Disagreements With Accountants on Accounting and Financial

Subsequent Events

Subsequent to December 31, 2021 through March 31, 2022, the Company’s board of directors approved the grant of options to purchase an aggregate of 1,815,926 shares of common stock at an exercise price of $ 4.85 per share.

The unrecognized stock-based compensation expense for these grants is approximately $ 5.9 million.

Additionally, the Company’s board of directors approved the grant of 266,744 restricted stock units.

The unrecognized stock-based compensation expense for these awards is approximately $ 1.3 million.

On March 28, 2022, the Company’s board of directors approved a corporate restructuring plan to discontinue the Company’s clinical development programs for SBT6050 and SBT6290 and to prioritize resources on the development of SBT8230 and early-stage discovery programs (the “Restructuring Plan”).

In connection with the Restructuring Plan, the Company’s workforce will be reduced by 27 %, with substantially all of the reduction in personnel expected to be completed by July 15, 2022 .

The Company initiated the reduction in force on March 31, 2022 and expects to provide severance payments, continuation of group health insurance coverage, and other benefits for a specified period to the affected employees.

The Company currently estimates that it will incur costs of approximately $ 2.0 million for termination benefits related to the Restructuring Plan, all of which will be cash expenditures paid in 2022.

Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.

What changed 10-K

Item 8. Financial Statements and Supplementary Data