Item 7. Management’s Discussion and Analysis
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
The following discussion should be read in conjunction with the consolidated financial statements and related notes included elsewhere in this report. Refer to Part II, Item 7 in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (filed with the SEC on March 2, 2023) for additional discussion of our financial condition and results of operations for the year ended December 31, 2022, as well as our financial condition and results of operations for the year ended December 31, 2022 compared to the year ended December 31, 2021. In addition to historical information, the following discussion and other parts of this Annual Report contain forward-looking information that involves risks and uncertainties.
Overview
SIGA Technologies, Inc. (“SIGA” or the “Company”) is a commercial-stage pharmaceutical company. The Company sells its lead product, TPOXX® (“oral TPOXX®,” also known as "tecovirimat" in certain international markets), to the U.S. Government and international governments (including government affiliated entities). Additionally, the Company sells the intravenous formulation of TPOXX® ("IV TPOXX®") to the U.S. Government.
TPOXX® is an oral formulation antiviral drug for the treatment of human smallpox disease caused by variola virus. On July 13, 2018, the United States Food & Drug Administration (“FDA”) approved oral TPOXX® for the treatment of smallpox. The Company has been delivering oral TPOXX® to the U.S. Strategic National Stockpile ("Strategic Stockpile") since 2013.
In connection with IV TPOXX®, SIGA announced on May 19, 2022 that the FDA approved this formulation for the treatment of smallpox.
In addition to being approved by the FDA, oral TPOXX® (tecovirimat) has regulatory approval with the European Medicines Agency ("EMA"), Health Canada and the Medicines and Healthcare Products Regulatory Agency ("MHRA") of the United Kingdom. The EMA and MHRA approved label indication covers the treatment of smallpox, monkeypox ("mpox"), cowpox, and vaccinia complications following vaccination against smallpox. The Health Canada approved label indication covers the treatment of smallpox.
With respect to the regulatory approvals by the EMA, MHRA and Health Canada, oral tecovirimat represents the same formulation that was approved by the FDA in July 2018 under the brand name TPOXX®.
In connection with a potential FDA label expansion of oral TPOXX® for an indication covering smallpox post-exposure prophylaxis (“PEP”), the Company completed an immunogenicity trial and an expanded safety trial in early 2023. The nature and timing of a submission of a supplemental New Drug Application to the FDA (“Supplemental NDA”) for a smallpox PEP indication for oral TPOXX® will be based on the results of the trials; the Company is currently targeting a Supplemental NDA filing in 2024.
In connection with the 2022 global response to an mpox outbreak, a series of observational and randomized, placebo-controlled clinical trials were initiated to assess the safety and efficacy of TPOXX® in participants with mpox. As of December 31, 2023, there were five randomized, placebo-controlled clinical trials enrolling patients, when available, in locations including the United States, United Kingdom, the Democratic Republic of Congo ("DRC"), South America and Europe. These randomized clinical trials are enrolling patients to collect data on the potential benefits of using TPOXX® as an antiviral treatment for active mpox disease.
The Company may be able to use data from the trials noted above, as well as from other trials, to potentially pursue an FDA label expansion of oral TPOXX® for an indication covering the treatment of mpox. The viability, and timing, of a potential FDA submission for an mpox indication will be impacted by a series of factors, including the magnitude and severity of future mpox cases, the location of future cases, enrollment in clinical trials, and results of randomized, placebo-controlled and observational clinical trials.
Recent Developments
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On January 27, 2024, Dr. Diem Nguyen commenced her employment as our new Chief Executive Officer and was appointed to the Board.
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During January and February of 2024, the Company delivered a total of approximately $7 million of oral TPOXX® to six countries in Europe pursuant to the $18 million firm commitment order announced in October 2023, as well as a total of approximately $15 million of oral TPOXX® to the U.S. Strategic National Stockpile.
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On March 12, 2024, the Board declared a special dividend of $0.60 per share on the common stock of the Company. The special dividend is payable on April 11, 2024 to shareholders of record at the close of business on March 26, 2024.
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Procurement Contracts with the U.S. Government
19C BARDA Contract
On September 10, 2018, the Company entered into a contract with the U.S. Biomedical Advanced Research and Development Authority ("BARDA") pursuant to which SIGA agreed to deliver up to 1,488,000 courses of oral TPOXX® to the Strategic Stockpile, and to manufacture and deliver to the Strategic Stockpile, or store as vendor-managed inventory, up to 212,000 courses of IV TPOXX®. In October 2023, the contract was modified so that a course of IV TPOXX® was redefined within the contract from being 14 vials to being 28 vials; as such, the 19C BARDA Contract currently specifies 106,000 courses of IV TPOXX® (for the same payment amount as originally specified). In addition to the delivery of TPOXX® courses, the contract includes funding from BARDA for a range of activities, including: advanced development of IV TPOXX®, post-marketing activities for oral and IV TPOXX®, and procurement activities. As of December 31, 2023, the contract with BARDA (as amended, modified, or supplemented from time to time, the "19C BARDA Contract") contemplates up to approximately $602.5 million of payments, of which approximately $51.7 million of payments are included within the base period of performance, approximately $407.1 million of payments are related to exercised options and up to approximately $143.7 million of payments are currently specified as unexercised options. BARDA may choose in its sole discretion when, or whether, to exercise any of the unexercised options. The period of performance for options is up to ten years from the date of entry into the 19C BARDA Contract and such options could be exercised at any time during the contract term.
The base period of performance specifies potential payments of approximately $51.7 million for the following activities: payments of approximately $11.1 million for the delivery of approximately 35,700 courses of oral TPOXX® to the Strategic Stockpile; payments of $8.0 million for the manufacture of 10,000 courses (as currently defined within the contract as being 28 vials) of final drug product of IV TPOXX® ("IV FDP"), of which $3.2 million of payments are related to the manufacture of bulk drug substance ("IV BDS") to be used in the manufacture of IV FDP; payments of approximately $32.0 million to fund reimbursed activities; and payments of approximately $0.6 million for supportive procurement activities. As of December 31, 2023, the Company had received $11.1 million for the delivery of approximately 35,700 courses of oral TPOXX® to the Strategic Stockpile, $3.2 million for the manufacture of IV BDS, $4.3 million for the delivery of IV FDP to the Strategic Stockpile and $22.1 million for other base period activities. IV BDS has been used for the manufacture of courses of IV FDP. The $3.2 million received for the completed manufacture of IV BDS had been recorded as deferred revenue as of December 31, 2021, but with the delivery of IV FDP to the Strategic Stockpile during 2022, $2.9 million was recognized as revenue. The remaining $0.3 million of deferred revenue will be recognized as IV FDP containing such IV BDS is delivered to and accepted by the Strategic Stockpile.
The options that have been exercised to date provide for payments up to approximately $407.1 million. There are exercised options for the following activities: payments up to $337.7 million for the manufacture and delivery of up to 1.1 million courses of oral TPOXX®; payments up to $51.2 million for the manufacture of courses of IV FDP, of which $20.4 million of payments relate to the manufacture of IV BDS to be used in the manufacture of IV FDP; payments of up to approximately $3.6 million to fund post-marketing activities for IV TPOXX®; and payments of up to $14.6 million for funding of post-marketing activities for oral TPOXX®. As of December 31, 2023, the Company has cumulatively delivered $323.0 million of oral TPOXX® to the Strategic Stockpile, of which $97.9 million was delivered in the fourth quarter of 2023; has cumulatively received $20.5 million for the completed manufacture of IV BDS, of which $20.5 million has been recorded as deferred revenue as of December 31, 2023; and has been cumulatively reimbursed $7.9 million in connection with post-marketing activities for oral and IV TPOXX®. In the first two months of 2024 ended February 29, 2024, approximately $15 million of oral TPOXX® was delivered to the Strategic Stockpile.
Unexercised options specify potential payments up to approximately $143.7 million in total (if all such options are exercised), of which approximately $5.6 million relates to supportive activities that we currently do not expect to be required. There are options for the following activities: payments of up to $112.5 million for the delivery of oral TPOXX® to the Strategic Stockpile; and payments of up to $25.6 million for the manufacture of courses of IV FDP, of which up to $10.2 million of payments would be paid upon the manufacture of IV BDS to be used in the manufacture of IV FDP.
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The options related to IV TPOXX® are divided into two primary manufacturing steps. There are options related to the manufacture of bulk drug substance (“IV BDS Options”), and there are corresponding options (for the same number of IV courses) for the manufacture of final drug product (“IV FDP Options”). BARDA may choose to exercise any, all, or none of these options in its sole discretion. The 19C BARDA Contract includes: three separate IV BDS Options, each providing for the bulk drug substance equivalent of 32,000 courses (as currently defined within the contract) of IV TPOXX®; and three separate IV FDP Options, each providing for 32,000 courses of final drug product of IV TPOXX®. BARDA has the sole discretion as to whether to simultaneously exercise IV BDS Options and IV FDP Options, or whether to exercise options at different points in time (or alternatively, to only exercise the IV BDS Option but not the IV FDP Option). To date, BARDA has exercised two of the three IV BDS options and two of the three IV FDP options. If BARDA decides to only exercise the remaining IV BDS Option, then the Company would receive payments up to $10.2 million; alternatively, if BARDA decides to exercise the remaining IV BDS Option and IV FDP Option, then the Company would receive payments up to $25.6 million. For each set of options relating to a specific group of courses (for instance, the IV BDS and IV FDP options that reference the same 32,000 courses), BARDA has the option to independently purchase IV BDS or IV FDP. The Company estimates that sales of the IV formulation under this contract (under current terms), assuming the remaining IV FDP Option was exercised, would have a gross margin (sales less cost of sales, as a percentage of sales) that is less than 40%.
Under the terms of this contract, exercise of procurement options is at the sole discretion of BARDA. The request for proposal that preceded the award of the 19C BARDA Contract indicated that the expected purpose of the contract was to maintain the level of smallpox antiviral preparedness in the Strategic Stockpile. Based on prior product delivery activity, and current FDA-approved shelf life of oral TPOXX®, the Company estimates that the remaining options under the 19C BARDA Contract for 363,000 courses of oral TPOXX® (value of $112.5 million) and 32,000 courses of IV FDP (value of $25.6 million) would need to be exercised in 2024 in order to approximately maintain historical stockpile levels of unexpired TPOXX® treatment in the Strategic Stockpile.
U.S. Department of Defense Procurement Contracts
On May 12, 2022, the Company announced a contract with the U.S. Department of Defense ("DoD") for the procurement of oral TPOXX® ("DoD Contract #1"). The DoD Contract #1 included a firm commitment for the DoD to procure approximately $3.6 million of oral TPOXX®, and an option, exercisable at the sole discretion of the DoD, for the procurement of an additional approximately $3.8 million of oral TPOXX®. In the second quarter of 2022, the Company delivered oral TPOXX® to the DoD and recognized revenue of $3.6 million, fulfilling the firm commitment in DoD Contract #1. In the third quarter of 2022, the DoD exercised the option for $3.8 million of oral TPOXX® and the Company satisfied its obligation by delivering product in September 2022 and recognized the related revenue.
On September 28, 2022, the Company and the DoD signed a new procurement contract ("DoD Contract #2"). The DoD Contract #2 included a firm commitment for the DoD to procure approximately $5.1 million of oral TPOXX®, and an option, exercisable at the sole discretion of the DoD for the procurement of an additional approximately $5.5 million of oral TPOXX®.
In March 2023, the Company fulfilled the firm commitment by delivering $5.1 million of oral TPOXX® to the DoD, and recognized the related revenue. Additionally, in March 2023 the DoD exercised the $5.5 million option in DoD Contract #2 for the procurement of oral TPOXX® and the Company delivered these courses to the DoD in the fourth quarter of 2023.
In February 2024, DoD Contract #2 was amended and approximately $1 million of oral TPOXX® was ordered by the DoD.
International Procurement Contracts
In 2023, the Company has delivered, and received acceptance for, approximately $21.3 million of oral TPOXX® to five European countries, one Middle Eastern country, and one Asia Pacific country. In the first two months of 2024 ending February 29, 2024, the Company delivered an additional approximately $7 million of oral TPOXX® to six countries in Europe, completing greater than 95% of deliveries under the $18 million of firm commitment orders from 13 countries under the European Commission’s DG HERA (Health Emergency Preparedness and Response Authority) joint procurement mechanism, which was announced by the Company in October 2022. Additionally, $0.7 million of oral TPOXX® was delivered to the Canada Department of National Defence ("CDND") in February 2024. These deliveries were made in connection with orders and contracts under the International Promotion Agreement (defined and discussed below). Through the International Promotion Agreement, Meridian Medical Technologies, Inc. ("Meridian") is the counterparty to international contracts under which orders are placed for the purchase of oral TPOXX®.
In addition to the above-mentioned orders and deliveries, the Company has a contract with the CDND under which the CDND has an option until December 31, 2025, exercisable at its sole discretion, for the purchase of up to an additional $6.7 million of oral TPOXX®. As an international contract, this contract is also administered under the International Promotion Agreement. The contract with the CDND (the "Canadian Military Contract"), issued in April of 2020 and subsequently amended, is option-based and initially specified that the CDND would purchase up to $14 million of oral TPOXX® if all options were exercised.
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International Promotion Agreement
Under the terms of the International Promotion Agreement, as amended, which has an initial term that expires on May 31, 2024, Meridian was granted exclusive rights to market, advertise, promote, offer for sale, or sell oral TPOXX® in a field of use specified in the International Promotion Agreement in all geographic regions except for the United States (the “Territory”), and Meridian has agreed not to commercialize any competing product, as defined in the International Promotion Agreement, in the specified field of use in the Territory. SIGA retains ownership, intellectual property, distribution and supply rights and regulatory responsibilities in connection with TPOXX®, and, in the United States market, also retains sales and marketing rights with respect to oral TPOXX®. SIGA’s consent is required for the entry into any sales arrangement pursuant to the International Promotion Agreement.
Sales to international customers pursuant to the International Promotion Agreement are invoiced and collected by Meridian, and such collections are remitted, less Meridian's fees, to the Company under a quarterly process specified in the International Promotion Agreement. The fee Meridian retains pursuant to the International Promotion Agreement is a specified percentage of the collected proceeds of sales of oral TPOXX®, net of certain expenses, for calendar years in which customer collected amounts net of such expenses are less than or equal to a specified threshold, and a higher specified percentage of such collected net proceeds for calendar years in which such net collected amounts exceed the specified threshold. We exceeded the specified threshold in 2022 and therefore recorded the higher specified percentage for all International Promotion Agreement sales in 2022. Taking into account Meridian’s fee and manufacturing costs of oral TPOXX®, it is currently estimated by the Company that international sales of oral TPOXX® each year will have a contribution margin (as expressed as a percentage of product sales, and before any consideration of expenses not directly related to manufacturing or Meridian activities) of between approximately 65% and 80%, depending on the international sales levels each year. For purposes of this disclosure, contribution margin (in amount) represents international product sales less applicable cost of sales and the Meridian fee (which is included within selling, general and administrative expenses within the income statement).
Research Agreements and Grants
In July 2019, the Company was awarded a multi-year research contract ultimately valued at approximately $27 million from the DoD to support work in pursuit of a potential label expansion for oral TPOXX® that would include post-exposure prophylaxis ("PEP") of smallpox (such work known as the "PEP Label Expansion Program" and the contract referred to as the "PEP Label Expansion R&D Contract"). As of December 31, 2023, the Company invoiced the full amount of available funding. As of December 31, 2023, there is no remaining revenue to be recognized in the future under the PEP Label Expansion R&D Contract. Revenue from the performance obligation under the PEP Label Expansion R&D Contract was recognized over time using an input method using costs incurred to date relative to total estimated costs at completion.
Contracts and grants include, among other things, options that may or may not be exercised at the U.S. Government’s discretion. Moreover, contracts and grants contain customary terms and conditions including the U.S. Government’s right to terminate or restructure a contract or grant for convenience at any time. As such, the Company may not be eligible to receive all available funds.
Critical Accounting Estimates
The methods, estimates and judgments we use in applying our accounting policies have a significant impact on the results we report in our consolidated financial statements, which we discuss under the heading “Results of Operations” following this section of our Management’s Discussion and Analysis of Financial Condition and Results of Operations. Some of our accounting policies require us to make difficult and subjective judgments, often as a result of the need to make estimates of matters that are inherently uncertain. Our most critical accounting estimates include revenue recognition over time, and income taxes (including realization of deferred tax assets).
Revenue Recognition
We account for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”). The unit of account in ASC 606 is a performance obligation. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. Our performance obligations are satisfied over time as work progresses or at a point in time. Revenue connected with performance obligations related to product delivery and supportive services are recognized at a point in time. Revenue connected with performance obligations related to research and development are recognized over time.
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Due to the nature of the work required to be performed on many of our performance obligations for which revenue is recognized over time, the estimation of total revenue and costs to satisfy the obligations may be complex, subject to many variables and requires significant judgment. The consideration associated with these types of performance obligations is considered variable. We estimate variable consideration as the most likely amount to which we expect to be entitled. We include estimated amounts in the transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur and when any uncertainty associated with variable consideration is resolved. Our estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of our historical and anticipated performance, external factors, trends and all other information (historical, current and forecasted) that is reasonably available to us.
Contracts are often modified to account for additional services to be performed. We consider contract modifications to exist when the modification either creates new enforceable rights and obligations, or changes existing enforceable rights and obligations. If the effect of a contract modification on the transaction price changes our measure of progress for the performance obligation to which it relates, the impact will be recognized in the period of modification as an adjustment to revenue (either as an increase in or a reduction of revenue) on a cumulative catch-up basis.
We have a process in which management reviews the progress and execution of our performance obligations. As part of this process, management reviews information including, but not limited to, any outstanding key contract matters, progress towards completion and the related program schedule, identified risks and opportunities and the related changes in estimates of revenues and costs. The risks and opportunities include management’s judgment about the ability and cost to achieve the schedule, technical requirements and other contract requirements. Management must make assumptions and estimates regarding labor productivity, the complexity of the work to be performed, customer behavior and execution by our subcontractors, among other variables.
Based on this analysis, any quarterly adjustments to revenues, research and development expenses and cost of sales and supportive services are recognized as necessary in the period they become known. Changes in estimates of revenues, research and development expenses and cost of sales and supportive services are recognized quarterly on a cumulative catch-up basis, which recognizes in the current period the cumulative effect of the changes on current and prior periods based on a performance obligation’s percentage of completion. A significant change in one or more of these estimates could affect the profitability of one or more of our performance obligations.
Income Taxes
Our income tax expense and deferred tax assets and liabilities reflect management’s best estimate of current and future taxes to be paid. We are subject to U.S. federal income tax and state income tax in numerous jurisdictions. Significant judgments and estimates are required in the determination of our income tax expense.
Deferred income taxes arise from temporary differences between the tax basis of assets and their reported amounts in the financial statements, which will result in taxable or deductible amounts in the future. Each reporting period, we assess the realizability of our deferred tax assets to determine if the deductible temporary differences will be utilized on a more-likely-than-not basis. In making this determination, we assess all available positive and negative evidence to determine if our existing deferred tax assets are realizable on a more-likely-than-not basis. Significant weight is given to positive and negative evidence that is objectively verifiable. We consider the reversal of existing taxable temporary differences, projected future taxable income, tax planning strategies and recent financial operating results.
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The amount of deferred tax assets considered realizable, however, could be adjusted if estimates of future taxable income change and/or if significant objective negative evidence is no longer present or if significant negative evidence becomes available. Such changes could lead to a change in judgment related to the realization of the net deferred tax asset. Future changes in the estimated amount of deferred taxes expected to be realized will be reflected in our financial statements in the period the estimate is changed with a corresponding adjustment to operating results.
Income tax benefits are recognized for a tax position when, in management’s judgment, it is more likely than not that the position will be sustained upon examination by a taxing authority. For a tax position that meets the more-likely-than-not recognition threshold, the tax benefit is measured as the largest amount that is judged to have a greater than 50% likelihood of being realized upon ultimate settlement with a taxing authority. We have recorded a liability for unrecognized tax benefits resulting from tax positions taken, or expected to be taken, in an income tax return. It is the Company’s policy to recognize interest and penalties related to uncertain tax positions as a component of income tax expense. Uncertain tax positions are evaluated and adjusted as appropriate, while taking into account the progress of audits of various taxing jurisdictions.
Recently Issued Accounting Pronouncements
For discussion regarding the impact of accounting standards that were recently issued but are not yet effective, on our consolidated financial statements, see Note 2 , Summary of Significant Accounting Policies , to the consolidated financial statements.
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Results of Operations for the Years ended December 31, 2023 and 2022
Revenues from product sales and supportive services for the years ended December 31, 2023 and 2022 were $130.7 million and $86.7 million, respectively. Such revenues for the year ended December 31, 2023 include $97.9 million of oral TPOXX® sales to the U.S. Government under the 19C BARDA Contract; $21.3 million related to international sales of oral TPOXX®; and approximately $10.7 million of oral TPOXX® sales to the DoD. Such revenues for the year ended December 31, 2022 include $71.0 million related to international sales of oral TPOXX®; $7.5 million of oral TPOXX® sales to the DoD; and approximately $7.2 million of sales of IV TPOXX® to the U.S. Government under the 19C BARDA Contract.
Revenues from research and development activities for the years ended December 31, 2023 and 2022, were $9.2 million and $24.1 million, respectively. These revenues are mostly earned in connection with performance of research and development activities under the PEP Label Expansion R&D Contract and 19C BARDA Contract. The decrease of $14.9 million of revenue is primarily related to a decrease in clinical trial activity.
Cost of sales and supportive services for the years ended December 31, 2023 and 2022 were $17.8 million and $10.4 million, respectively. Such costs in 2023 were primarily associated with increases in the manufacture and delivery of oral TPOXX® courses to the U.S. Government and various international countries. Such costs in 2022 were primarily associated with the manufacture and delivery of oral TPOXX® courses to various international countries and approximately $4.4 million of costs for the manufacture and delivery of IV TPOXX®.
Selling, general and administrative expenses for the years ended December 31, 2023 and 2022 were $22.0 million and $35.1 million, respectively. The decrease of $13.1 million mostly reflects a decrease in promotion fees to Meridian as international sales decreased from approximately $71 million in 2022 (in response to the mpox outbreak) to approximately $21 million in 2023, partially offset by higher professional fees.
Research and development expenses were $16.4 million for the year ended December 31, 2023, a decrease of approximately $6.1 million from the $22.5 million incurred during the year ended December 31, 2022. The decrease is mostly attributable to lower direct vendor-related expenses incurred in connection with clinical activity, partially offset by an increase in regulatory costs associated with EMA regulatory submissions and related activities.
Changes in the fair value of the liability classified warrant to acquire common stock were recorded within the income statement. The warrant was fully exercised during the year ended December 31, 2022. For the year ended December 31, 2023, we recorded no activity. For the year ended December 31, 2022, we recorded a gain of approximately $0.4 million, reflecting a decrease in the fair value of the liability-classified warrant primarily due to the decrease in our stock price.
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Other income, net for the years ended December 31, 2023 and 2022 was $4.2 million and $1.0 million, respectively. The increase relates to interest income earned on cash and cash equivalents at rates that are substantially higher in 2023 in comparison to 2022.
For the year ended December 31, 2023, we recognized a tax provision of $19.7 million on pre-tax income of $87.8 million. Our effective tax rate for the year ended December 31, 2023 was 22.5% and differs from the statutory rate of 21% primarily as a result of non-deductible executive compensation under IRC Section 162(m), shortfalls on stock-based compensation, and state and local taxes.
For the year ended December 31, 2022, we recognized a tax provision of $10.2 million on pre-tax income of $44.1 million. Our effective tax rate for the year ended December 31, 2022 was 23.2% and differs from the statutory rate of 21% primarily as a result of non-deductible executive compensation under IRC Section 162(m), and state and local taxes.
Liquidity and Capital Resources
As of December 31, 2023, we had $150.1 million in cash and cash equivalents, compared with $98.8 million at December 31, 2022. We believe that our liquidity and capital resources will be sufficient to meet our anticipated requirements for at least the next twelve months from the issuance of these financial statements.
Operating Activities
We prepare our consolidated statement of cash flows using the indirect method. Under this method, we reconcile net income to cash flows from operating activities by adjusting net income for those items that impact net income but may not result in actual cash receipts or payments during the period. These reconciling items include but are not limited to stock-based compensation, deferred income taxes and changes in the fair value of our warrant liability; gains and losses from various transactions and changes in the consolidated balance sheet for working capital from the beginning to the end of the period.
Net cash provided by operations for the years ended December 31, 2023 and 2022 was $94.8 million and $41.6 million, respectively. For the year ended December 31, 2023, the receipt of substantially all of the $45 million of accounts receivable as of December 31, 2022, the receipt of approximately $111 million of 2023 product sales of oral TPOXX®, as well as approximately $10 million received in connection with IV BDS deferred revenue was partially offset by the use of cash to proactively build inventory, and for operating activities. For the year ended December 31, 2022, the receipt of approximately $80 million for the product delivery and acceptance of oral TPOXX® courses delivered to the Strategic Stockpile in December 2021, as well as the receipt of approximately $27 million in connection with 2022 product deliveries and advance payments were partially offset by the payment of $31 million of federal and state income taxes; an increase in inventory investment in connection with broadening of the customer base for TPOXX® and mitigation of increasing general supply chain risks; and costs in relation to customary operating activities.
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On December 31, 2023 and 2022, our accounts receivable balance was approximately $21.1 million (which includes approximately $10.3 million of unbilled receivables) and $45.4 million, respectively. Our accounts receivable balance as of December 31, 2023 primarily reflects sales of oral TPOXX® to the U.S. Government under the 19C BARDA Contract as well as various international countries, of which approximately $11.2 million was received by the Company through the end of February 2024. The remaining amounts of the receivable balance are expected to be collected during the first or second quarter of 2024. Our accounts receivable balance as of December 31, 2022 primarily reflected sales of oral TPOXX® to various international countries, of which approximately $35 million was received by the Company in February 2023. The remaining amounts of the receivable balance were collected during the second quarter of 2023.
Investing Activities
We used $21,686 for capital expenditures for the year ended December 31, 2023. For the year ended December 31, 2022, there were no cash-related activities.
Financing Activities
Cash used in financing activities for the years ended December 31, 2023 and 2022 was $43.4 million and $46.0 million, respectively. For the year ended December 31, 2023, we paid a special dividend of approximately $32.1 million. In addition, we purchased approximately 1.7 million shares of common stock for approximately $11.0 million. For the year ended December 31, 2022, we paid a special dividend of approximately $32.9 million. In addition, we purchased approximately 1.8 million shares of common stock for approximately $13.0 million.
Future Cash Requirements
As of December 31, 2023, we have outstanding purchase orders associated with manufacturing obligations in the aggregate amount of approximately $14.8 million.
On March 12, 2024, the Board of Directors declared a special dividend of $0.60 per share on the common stock of the Company. The special dividend is payable on April 11, 2024 to shareholders of record at the close of business on March 26, 2024.
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