AFFILIATED MANAGERS GROUP, INC. 10-Q

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds (a) None. (b) None. (c) Purchases of Equity Securities by the Issuer: Period Total Number of Shares Purchased (1) Average Price Paid Per Share Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs Average Price Paid Per Share Maximum Number of Shares that May Yet Be Purchased Under Outstanding Plans or Programs (2) July 1-31, 2024 572,663 $ 163.19 572,663 $ 163.19 5,998,041 August 1-31, 2024 60,182 163.56 60,182 163.56 5,937,859 September 1-30, 2024 — — — — 5,937,859 Total 632,845 163.23 632,845 163.23 ___________________________ (1) Includes shares surrendered to the Company to satisfy tax withholding and/or option exercise price obligations in connection with stock swap and option exercise transactions, if any. (2) Our Board of Directors authorized share repurchase programs in October 2022 , October 2023 , and July 2024 to repurchase up to 3.0 million , 3.3 million , and 5.4 million shares of our common stock, respectively, and these authorizations have no expiry. Purchases may be made from time to time, at management’s discretion, in the open market or in privately negotiated transactions, including through the use of trading plans, as well as pursuant to accelerated share repurchase programs or other share repurchase strategies that may include derivative financial instruments. As of March 31, 2024 , we had repurchased all of the shares in the repurchase program authorized in October 2022. As of September 30, 2024 , there were a total of 5.9 million shares available for repurchase under our share repurchase programs. Item 6. Exhibits The exhibits are listed on the Exhibit Index below. 43 Table of Contents EXHIBIT INDEX Exhibit No. Description 4.1 Second Supplemental Indenture, dated as of August 20, 2024, between the Registrant, as issuer, and U.S. Bank Trust Company, National Association, as trustee, including the form of Global Note attached as Annex A thereto (incorporated by reference to Exhibit 4.2 to the Registrant’s Current Report on Form 8-K (No. 001-13459), filed August 20, 2024) 31.1 Certification of Registrant’s Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002* 31.2 Certification of Registrant’s Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002* 32.1 Certification of Registrant’s Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002** 32.2 Certification of Registrant’s Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002** 101 The following financial statements from the Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2024 are filed herewith, formatted in XBRL (Inline eXtensible Business Reporting Language): (i) the Consolidated Statements of Income for the three- and nine -month periods ended September 30, 2024 and 2023 , (ii) the Consolidated Statements of Comprehensive Income for the three- and nine -month periods ended September 30, 2024 and 2023 , (iii) the Consolidated Balance Sheets at September 30, 2024 and December 31, 2023 , (iv) the Consolidated Statements of Changes in Equity for the three- and nine -month periods ended September 30, 2024 and 2023 , (v) the Consolidated Statements of Cash Flows for the nine -month periods ended September 30, 2024 and 2023 , and (vi) the Notes to the Consolidated Financial Statements 104 The cover page from the Registrant’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2024 , formatted in XBRL (Inline eXtensible Business Reporting Language) and contained in Exhibit 101 * Filed herewith ** Furnished herewith 44 Table of Contents SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. AFFILIATED MANAGERS GROUP, INC. (Registrant) November 7, 2024 /s/ DAVA E. RITCHEA Dava E. Ritchea on behalf of the Registrant as Chief Financial Officer (and also as Principal Financial and Principal Accounting Officer) Table of Contents QuickLinks PART I—FINANCIAL INFORMATION Item 1. Financial Statements AFFILIATED MANAGERS GROUP, INC. CONSOLIDATED STATEMENTS OF INCOME (in millions, except per share data) (unaudited) AFFILIATED MANAGERS GROUP, INC. CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (in millions) (unaudited) AFFILIATED MANAGERS GROUP, INC. CONSOLIDATED CONDENSED BALANCE SHEETS (in millions) (unaudited) AFFILIATED MANAGERS GROUP, INC. CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (in millions) (unaudited) AFFILIATED MANAGERS GROUP, INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (in millions) (unaudited) AFFILIATED MANAGERS GROUP, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations Item 3. Quantitative and Qualitative Disclosures About Market Risk Item 4. Controls and Procedures PART II—OTHER INFORMATION Item 2. Unregistered Sales of Equity Securities and Use of Proceeds Item 6. Exhibits EXHIBIT INDEX SIGNATURES