X0202 SCHEDULE 13D/A 0001104659-26-012643 0001052192 XXXXXXXX LIVE 1 Common stock, par value $0.01 per share 05/01/2026 false 0000350698 05329W102 AutoNation, Inc.

200 SW 1st Ave Fort Lauderdale FL 33301

Jeff Shim, Esq. (425) 889-7900 2365 Carillon Point Kirkland WA 98033 0001052192 N Cascade Investment, L.L.C. WC N WA 7062629.00 0.00 7062629.00 0.00 7062629.00 N 21.1 OO All shares of the common stock, $0.01 par value per share (the "Common Stock") of AutoNation, Inc. (the "Issuer") held by Cascade Investment, L.L.C. ("Cascade") may be deemed to be beneficially owned by William H. Gates III as the sole member of Cascade. Item 13 is based on 33,461,495 shares of Common Stock outstanding as of April 29, 2026, as reported on the Issuer's Form 10-Q filed on May 1, 2026. 0000902012 N William H. Gates III WC N X1 7062629.00 0.00 7062629.00 0.00 7062629.00 N 21.1 IN All shares of the Common Stock of the Issuer held by Cascade may be deemed to be beneficially owned by William H. Gates III as the sole member of Cascade. Item 13 is based on 33,461,495 shares of Common Stock outstanding as of April 29, 2026, as reported on the Issuer's Form 10-Q filed on May 1, 2026. Common stock, par value $0.01 per share AutoNation, Inc. 200 SW 1st Ave Fort Lauderdale FL 33301 This Amendment No. 1 to Schedule 13D ("Amendment") amends and supplements the Schedule 13D previously filed by Cascade Investment, L.L.C. ("Cascade") and William H. Gates III ("WHG," and together with Cascade, the "Reporting Persons") with the Securities and Exchange Commission on February 10, 2026, relating to the common stock, $0.01 par value per share (the "Common Stock"), of AutoNation, Inc. (the "Issuer"). Information in the Schedule 13D remains in effect except to the extent that it is amended or superseded by subsequently filed information, including information in this Amendment. This Amendment is being filed due to an increase in the percentage of the Reporting Persons' ownership resulting from a decrease in the Issuer's outstanding shares of Common Stock, and not as a result of recent acquisitions by the Reporting Persons. See items 11 and 13 of the cover pages to this Amendment for the aggregate number of shares of Common Stock and percentage of Common Stock beneficially owned by each of the Reporting Persons. See items 7 through 10 of the cover pages to this Amendment for the number of shares of Common Stock beneficially owned by each of the Reporting Persons as to which there is sole power to vote or to direct the vote, shared power to vote or to direct the vote, and sole or shared power to dispose or to direct the disposition. None. None. Not applicable. Cascade Investment, L.L.C. /s/ Alan Heuberger 05/05/2026 William H. Gates III /s/ Alan Heuberger 05/05/2026 This Amendment is being filed jointly by the Reporting Persons pursuant to the Joint Filing Agreement dated February 10, 2026, and included with the signature page to the Reporting Persons' Schedule 13D filed with respect to the Issuer on February 10, 2026, SEC File No. 005-40342, and incorporated by reference herein. Duly authorized under Special Limited Power of Attorney appointing Alan Heuberger attorney-in-fact, dated October 11, 2013, by and on behalf of Michael Larson, filed as Exhibit 99.1 to Amendment No. 9 to Cascade's Schedule 13D with respect to Western Asset/Claymore Inflation-Linked Opportunities & Income Fund on December 11, 2013, SEC File No. 005-81261, and incorporated by reference herein. Duly authorized under Special Limited Power of Attorney appointing Alan Heuberger attorney-in-fact, dated August 12, 2008, by and on behalf of William H. Gates III, filed as Exhibit 99.2 to Amendment No. 1 to Cascade's Schedule 13D with respect to Otter Tail Corporation on April 15, 2009, SEC File No. 005-06638, and incorporated by reference herein.