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SCHEDULE 13D/A 0001235126-25-000003 0000938673 XXXXXXXX LIVE 12 Common Stock $0.001 par value per share 02/28/2026 false 0001362468 01748X102 Allegiant Travel Company 1201 N Town Center Drive Las Vegas NV 89144 Robert B. Goldberg, Esq. 678-613-7210 1144 Alpharetta Street Suite 200 Roswell GA 30075 0000938673 N Maurice J. Gallagher, Jr. PF N X1 2048348.00 2048348.00 2048348.00 N 11.1 IN (1) Mr. Gallagher exercises voting and dispositive power over 11,000 shares of common stock of Allegiant Travel Company held by a trust under which he serves as a Trustee and 150,000 shares of common stock held by a limited liability company controlled by Mr. Gallagher. (2) Based on the 18,452,294 shares of common stock outstanding as of February 20, 2026. Common Stock $0.001 par value per share Allegiant Travel Company 1201 N Town Center Drive Las Vegas NV 89144 This Amendment No. 12 relates to the Schedule 13D filed with the Securities and Exchange Commission on December 8, 2006 as amended by that certain Amendment No. 1 filed with the Commission on February 17, 2015, that certain Amendment No. 2 filed with the Commission on February 17, 2016, that certain Amendment No. 3 filed with the Commission on February 16, 2017, that certain Amendment No. 4 filed with the Commission on March 9, 2018, that certain Amendment No. 5 filed with the Commission on February 20, 2019, that certain Amendment No. 6 filed with the Commission on April 5, 2019, that certain Amendment No. 7 filed with the Commission on February 12, 2020, that certain Amendment No. 8 filed with the Commission on February 12, 2021, that certain Amendment No. 9 filed with the Commission on February 17, 2022, that certain Amendment No. 10 filed with the Commission on February 16, 2023 and that certain Amendment No. 11 filed with the Commission on February 20, 2025 relating to the Common Stock, $.001 par value per share, of Allegiant Travel Company, a Nevada corporation (the "Company"). The principal executive offices of the Company are located at 1201 North Town Center Drive, Las Vegas, Nevada 89144. Item 5 of the Schedule is hereby amended and supplemented by the following: As of February 28, 2026, Mr. Gallagher beneficially owns 2,048,348 shares of the Company's common stock, representing 11.10% of the outstanding common stock of the Company. These shares include (x) 11,000 shares of common stock held by a trust under which Mr. Gallagher serves as Trustee and 150,000 shares of common stock held by a limited liability company controlled by Mr. Gallagher as described in Item 6. The percentage of Mr. Gallagher's ownership of common stock of the Company has varied since the effective date of Amendment No. 11 to this Schedule 13D as Mr. Gallagher has sold shares of the Company's common stock. Mr. Gallagher has the sole power to vote and sole power to dispose or to direct the disposition of all of the 2,048,348 shares reported as beneficially owned by him. In the past 60 days, Mr. Gallagher has sold 250,000 shares of the Company's common stock owned by him directly and 50,000 shares of the Company's common stock held by a limited liability company controlled by Mr. Gallagher. No other person has the right to receive or the power to direct the receipt of the dividends from, or proceeds from the sale of, such securities. Maurice J. Gallagher, Jr. Maurice J. Gallagher, Jr. Maurice J. Gallagher, Jr. 03/09/2026