# EDGAR Filing Document

**Accession Number:** 0000810332
**File Stem:** 0001193125-25-221254
**Filing Date:** 2025-9
**Character Count:** 4777
**Document Hash:** d378f76d324222be2d41ecde236aaa3c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-221254.hdr.sgml**: 20250929

**ACCESSION NUMBER**: 0001193125-25-221254

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 12

**CONFORMED PERIOD OF REPORT**: 20250924

**ITEM INFORMATION**: Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

**FILED AS OF DATE**: 20250929

**DATE AS OF CHANGE**: 20250929

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MESA AIR GROUP INC
- **CENTRAL INDEX KEY:** 0000810332
- **STANDARD INDUSTRIAL CLASSIFICATION:** AIR TRANSPORTATION, SCHEDULED [4512]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 850302351
- **STATE OF INCORPORATION:** NV
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38626
- **FILM NUMBER:** 251351971

**BUSINESS ADDRESS:**
- **STREET 1:** 410 NORTH 44TH STREET
- **STREET 2:** SUITE 700
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85008
- **BUSINESS PHONE:** 602.685.4000

**MAIL ADDRESS:**
- **STREET 1:** 410 NORTH 44TH STREET
- **STREET 2:** SUITE 700
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85008

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MESA AIRLINES INC
- **DATE OF NAME CHANGE:** 19950426

?xml version='1.0' encoding='ASCII'? 8-K

### 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): September 24, 2025

## Mesa Air Group, Inc.

#### (Exact name of Registrant as Specified in Its Charter)

---

| | | |
|:---|:---|:---|
| **Nevada** | **001-38626** | **85-0302351** |
| **(State or Other Jurisdiction**<br> **of Incorporation)** | **(Commission**<br> **File Number)** | **(IRS Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **410 North 44th Street, Suite 700** |  |
| **Phoenix, Arizona** | **85008** |
| **(Address of Principal Executive Offices)** | **(Zip Code)** |

---

#### Registrant's Telephone Number, Including Area Code: (602) 685-4000

#### 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**<br> **Symbol(s)** | **Name of each exchange**<br> **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 5.03.** | **Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.**  |

---

On September 24, 2025, the Board of Directors of Mesa Air Group, Inc. (the "Company") approved a change in the Company's fiscal year-end, moving from September 30 to December 31 of each year, effective for the fiscal year beginning on January 1, 2025 and ending on December 31, 2025.

The Company will file a Quarterly Report on Form 10-Q on or about November 14, 2025 for the three and nine months ending September 30, 2025 and will file a Transition Report on Form 10-KT no later than December 29, 2025 for the transition period from October 1, 2024 through December 31, 2024.

------

#### SIGNATURE
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. | Mesa Air Group, Inc. |
| Date: September 29, 2025 | By: | /s/ Brian S. Gillman |
|  |  | Name: Brian S. Gillman |
|  |  | Title: Executive Vice President and General Counsel |

---