Allegiant Travel CO (0001362468) (Filer)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549 

_____________________________________________

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 2, 2026

Registrant’s telephone number, including area code:              (702) 851-7300

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as in Rule 405 of the Securities Act of 1933 (Section 17 CFR §230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (Section 17 CFR §240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Section 7    Regulation FD

Item 7.01    Regulation FD

As previously disclosed, on May 13, 2026, Allegiant Travel Company ("the Company") completed its acquisition of Sun Country Airlines Holdings, Inc. The Company is making available certain unaudited pro forma financial information for the three-month periods ended March 31, 2025, June 30, 2025, September 30, 2025, December 31, 2025, March 31, 2026, and June 30, 2026, and for the year ended December 31, 2025, all reflecting the acquisition on a pro forma basis as if the transaction closed on January 1, 2025. This information is attached as Exhibit 99.1 to this report.

The information in Section 7 of this Current Report on Form 8-K and the Exhibit filed herewith is furnished pursuant to Item 7.01 of Form 8-K and shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that Section. As such, this information shall not be incorporated by reference into any of the Company’s reports or other filings made with the Securities and Exchange Commission.

Section 9    Financial Statements and Exhibits

Item 9.01    Financial Statements and Exhibits.

a.Not applicable.

b.Not applicable.

c.Not applicable.

d.Exhibits

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, Allegiant Travel Company has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized.