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) January 1-31, 2026 218,193 $ 315.95 218,193 $ 315.95 5,984,760 February 1-28, 2026 276,773 310.57 276,773 310.57 5,707,987 March 1-31, 2026 109,871 280.31 109,871 280.31 5,598,116 Total 604,837 $ 307.01 604,837 $ 307.01 ___________________________ (1) Includes shares surrendered to the Company in connection with certain st ock swap a nd option exercise transactions, if any. (2) Our Board of Directors authorized share repurchase programs in July 2024 and January 2026 to repurchase up to 5.4 million and 4.2 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, 2026 , there were a total of 5.6 million shares available for repurchase under our share repurchase programs. Item 6. Exhibits The exhibits are listed on the Exhibit Index below. 38 Table of Contents EXHIBIT INDEX Exhibit No. Description 10.1† Separation and Release Agreement, dated as of February 10, 2026, between the Registrant and Thomas M. Wojcik* 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 March 31, 2026 are filed herewith, formatted in XBRL (Inline eXtensible Business Reporting Language): (i) the Consolidated Statements of Income for the three -month periods ended March 31, 2026 and 2025 , (ii) the Consolidated Statements of Comprehensive Income for the three -month periods ended March 31, 2026 and 2025 , (iii) the Consolidated Balance Sheets at March 31, 2026 and December 31, 2025 , (iv) the Consolidated Statements of Changes in Equity for the three -month periods ended March 31, 2026 and 2025 , (v) the Consolidated Statements of Cash Flows for the three -month periods ended March 31, 2026 and 2025 , 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 March 31, 2026 , formatted in XBRL (Inline eXtensible Business Reporting Language) and contained in Exhibit 101 † Indicates a management contract or compensatory plan * Filed herewith ** Furnished herewith 39 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) May 7, 2026 /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)