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): October 31, 2025

MESA AIR GROUP, INC.

(Exact name of registrant as specified in its charter)

Nevada

001-38626

85-0302351

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)


410 North 44^th Street, Suite 700, Phoenix, Arizona		85008
(Address of principal executive offices)		(Zip Code)

(602) 685-4000

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

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:

Title of each class

Trading

Symbol(s)

Name of each exchange

on which registered

Common Stock, no par value

MESA

Nasdaq Capital Market

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

Item 8.01. Other Events.

On October 31, 2025, Mesa Air Group, Inc. (the “Company”) issued a press release announcing an amendment to its Loan and Guarantee Agreement with the United States Treasury and providing certain updates related to its pending merger with Republic Airways Holdings Inc. A copy of the Press Release is furnished as Exhibit 99.1 to this report.

Item 9.01 Financial Statements and Exhibits.

(d)

Exhibits.


Exhibit Number		Description

99.1		Press Release, dated October 31, 2025, issued by Mesa Air Group, Inc.

104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Mesa Air Group, Inc.

Date: October 31, 2025

/s/ Brian S. Gillman

Name: Brian S. Gillman

Title: Executive Vice President and General Counsel

MESA AIR GROUP INC 8-K