CEO — Robert V. Vitale: Robert V. Vitale is transitioning to the role of Executive Chairman, and Nicolas Catoggio has been appointed as President and Chief Executive Officer.

and Exhibit 99.1 attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

President and Chief Executive Officer — Robert V. Vitale: Robert V. Vitale is transitioning from President and CEO to Executive Chairman, with Nicolas Catoggio appointed as the new President and CEO.

and Exhibit 99.1 attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing.

Other Events. On May 5, 2026, the Board approved, effective May 9, 2026 (the “Effective Date”), a $600.0 million share repurchase authorization (the “New Authorization”) and cancelled, effective May 8, 2026, its existing $500.0 million share repurchase authorization, which was approved by the Board on February 3, 2026 and became effective on February 7, 2026 (the “Existing Authorization”). The Company had repurchased approximately $263.4 million of shares of the Company’s common stock under t…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. On March 13, 2026, Post Holdings, Inc. (the “Company”) issued 6.250% senior notes due 2034 (the “New Notes”) at a price of 100.75% of the principal amount, plus accrued interest from October 15, 2025 in an aggregate principal amount of $600.0 million (1) in the United States to persons reasonably believed to be qualified institutional buyers in an offering exempt from registratio…

Other Events. On March 4, 2026, Post Holdings, Inc. (the “Company”) announced the pricing of its previously announced senior notes offering. The Company priced $600.0 million in aggregate principal amount of 6.250% senior notes due 2034 (the “Notes”) at a price of 100.75% of the principal amount, plus accrued interest from October 15, 2025. The $600.0 million in aggregate principal amount of the Notes represented an increase from the original size of $500.0 million. The Notes offering is expe…

Other Events. On March 4, 2026, Post Holdings, Inc. (the “Company”) announced that it intends to commence a private offering to eligible purchasers, subject to market and other conditions, of $500.0 million in aggregate principal amount of the Company’s 6.250% senior notes due 2034 (the “Notes”). The Company also announced that it intends to use the net proceeds from the Notes offering to pay the costs, fees and expenses associated with the Notes offering, to fund the repayment of the outstan…

and Exhibit 99.1 attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Other Events. On February 3, 2026, the Board approved, effective February 7, 2026 (the “Effective Date”), a $500.0 million share repurchase authorization (the “New Authorization”) and cancelled, effective February 6, 2026, its existing $500.0 million share repurchase authorization, which was approved by the Board on November 25, 2025 and became effective on November 27, 2025 (the “Existing Authorization”). The Company had repurchased approximately $377.9 million of shares of the Company’s com…

President and Chief Executive Officer of Post Consumer Brands segment — Greg Pearson: Greg Pearson has been promoted to lead the Post Consumer Brands segment, while Nicolas Catoggio will continue in his existing role.

Director — Michelle M. Atkinson and Jeff A. Zadoks: The company appointed two new directors to the board.

Material Modification to Rights of Security Holders. To the extent applicable, the information set forth in

Other Events. On December 17, 2025, the Company completed the previously announced redemption of all of its outstanding 5.50% senior notes due 2029 (the “2029 Notes”). The 2029 Notes redeemed were governed by that certain Indenture dated as of July 3, 2019, by and among the Company, each of the guarantors party thereto and Computershare Trust Company, N.A., as successor to Wells Fargo Bank, National Association, Trustee, as supplemented by the First Supplemental Indenture dated as of February…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. On December 15, 2025, Post Holdings, Inc. (the “Company”) issued 6.50% senior notes due 2036 (the “New Notes”) at par in an aggregate principal amount of $1,300.0 million to certain persons reasonably believed to be qualified institutional buyers in reliance on Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”), and to certain non-U.S. persons in transa…

Other Events. On December 2, 2025, Post Holdings, Inc. (the “Company”) announced that it provided conditional notice that it has elected to redeem its outstanding 5.50% senior notes due 2029 (the “2029 Notes”), having an aggregate outstanding principal amount of $1,235.0 million, in accordance with the terms of the Indenture dated as of July 3, 2019, by and among the Company, each of the guarantors party thereto and Computershare Trust Company, N.A., as successor to Wells Fargo Bank, National…

Other Events. On December 1, 2025, Post Holdings, Inc. (the “Company”) announced the pricing of its previously announced senior notes offering. The Company priced $1,300.0 million in aggregate principal amount of 6.50% senior notes due 2036 at par (the “Notes”). The Notes offering is expected to close on December 15, 2025, subject to customary closing conditions. The Notes will be unsecured obligations of the Company and will be guaranteed on a senior unsecured basis by the Company’s existing…

Other Events. On December 1, 2025, the Company announced that it intends to commence a private offering to eligible purchasers, subject to market and other conditions, of $1,300.0 million in aggregate principal amount of senior notes due 2036 (the “Notes”). The Company also announced that it intends to use the net proceeds from the Notes offering to pay the costs, fees and expenses associated with the Notes offering, to redeem, after December 15, 2025, all of the Company’s outstanding 5.50% s…

Other Events. On November 25, 2025, the Board of Directors (the “Board”) of Post Holdings, Inc. (the “Company”) approved, effective November 27, 2025 (the “Effective Date”), a $500.0 million share repurchase authorization (the “New Authorization”) and cancelled, effective November 26, 2025, its existing $500.0 million share repurchase authorization, which was approved by the Board on August 27, 2025 and became effective on August 29, 2025 (the “Existing Authorization”). The Company had repurc…

CEO — Robert V. Vitale: The filing discloses the approval of routine annual stock-based compensation awards to named executive officers, not a change in management personnel.

Chairman — William P. Stiritz: The Chairman is retiring at age 91 with a pre-announced, orderly succession to the current CEO, indicating a planned transition rather than a sudden loss of leadership.

and Exhibit 99.1 attached hereto shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Other Events. On August 27, 2025, the Company’s Board of Directors (the “Board”) approved, effective August 29, 2025 (the “Effective Date”), a $500.0 million share repurchase authorization (the “New Authorization”) and cancelled, effective August 28, 2025, its existing $500.0 million share repurchase authorization, which was approved by the Board on February 4, 2025 and became effective on February 10, 2025 (the “Existing Authorization”). The Company had repurchased approximately $304.8 milli…

Results of Operations and Financial Condition. On August 7, 2025, Post Holdings, Inc. (the “Company”) issued a press release announcing results for its third fiscal quarter ended June 30, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

COO — Jeff A. Zadoks: The COO is retiring with a named successor (Nicolas Catoggio) already appointed, indicating an orderly succession rather than a sudden loss of leadership.