# EDGAR Filing Document

**Accession Number:** 0001181100
**File Stem:** 0001193125-26-161938
**Filing Date:** 2026-4
**Character Count:** 16536
**Document Hash:** a0ca0a07d2d0f5754941e102f10c9de2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-161938.hdr.sgml**: 20260417

**ACCESSION NUMBER**: 0001193125-26-161938

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260417

**FILED AS OF DATE**: 20260417

**DATE AS OF CHANGE**: 20260417

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** MADISON DEARBORN PARTNERS LLC
- **CENTRAL INDEX KEY:** 0001181100

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43238
- **FILM NUMBER:** 26872883

**BUSINESS ADDRESS:**
- **STREET 1:** 70 WEST MADISON STREET, SUITE 4600
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60602
- **BUSINESS PHONE:** 3128951000

**MAIL ADDRESS:**
- **STREET 1:** 70 WEST MADISON STREET, SUITE 4600
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60602
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** MADISON DEARBORN CAPITAL PARTNERS VII-B, L.P.
- **CENTRAL INDEX KEY:** 0001632184

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43238
- **FILM NUMBER:** 26872882

**BUSINESS ADDRESS:**
- **STREET 1:** THREE FIRST NATIONAL PLAZA, SUITE 4600
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60602
- **BUSINESS PHONE:** (312) 895-1000

**MAIL ADDRESS:**
- **STREET 1:** THREE FIRST NATIONAL PLAZA, SUITE 4600
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60602
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** MADISON DEARBORN CAPITAL PARTNERS VII-C, L.P.
- **CENTRAL INDEX KEY:** 0001632188

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43238
- **FILM NUMBER:** 26872880

**BUSINESS ADDRESS:**
- **STREET 1:** THREE FIRST NATIONAL PLAZA, SUITE 4600
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60602
- **BUSINESS PHONE:** (312) 895-1000

**MAIL ADDRESS:**
- **STREET 1:** THREE FIRST NATIONAL PLAZA, SUITE 4600
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60602
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** MADISON DEARBORN CAPITAL PARTNERS VII EXECUTIVE-B, L.P.
- **CENTRAL INDEX KEY:** 0001632190

**ORGANIZATION NAME:**
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-43238
- **FILM NUMBER:** 26872881

**BUSINESS ADDRESS:**
- **STREET 1:** THREE FIRST NATIONAL PLAZA, SUITE 4600
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60602
- **BUSINESS PHONE:** (312) 895-1000

**MAIL ADDRESS:**
- **STREET 1:** THREE FIRST NATIONAL PLAZA, SUITE 4600
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60602
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AEVEX Corp.
- **CENTRAL INDEX KEY:** 0002096300
- **STANDARD INDUSTRIAL CLASSIFICATION:** AIRCRAFT [3721]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 440 STEVENS AVE #150
- **CITY:** SOLANA BEACH
- **STATE:** CA
- **ZIP:** 92075
- **BUSINESS PHONE:** 858-704-4125

**MAIL ADDRESS:**
- **STREET 1:** 440 STEVENS AVE #150
- **CITY:** SOLANA BEACH
- **STATE:** CA
- **ZIP:** 92075

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Aevex Corp.
- **DATE OF NAME CHANGE:** 20251110

## Exhibit 24.1

POWER OF ATTORNEY<br>FOR SECTION 16 REPORTING OBLIGATIONS

Know all by these presents, that the undersigned hereby makes, constitutes and appoints Katherine M. Bryan and Annie S. Terry, each signing singly, as the undersigned's true and lawful attorneys-in-fact, with full power and authority as hereinafter described on behalf of and in the name, place and stead of the undersigned to:

(1)prepare, execute, acknowledge, deliver and file Forms 3, 4 and 5 (including any amendments thereto) with respect to the securities of AEVEX Corp., a company incorporated under the laws of the State of Delaware, or any successor thereto (the "<u>Company</u>"), with the U.S. Securities and Exchange Commission, any national securities exchanges and the Company, as considered necessary or advisable under Section 16(a) of the Securities Exchange Act of 1934 and the rules and regulations promulgated thereunder, as amended from time to time (the "<u>Exchange Act</u>");

(2)seek or obtain, as the undersigned's representative and on the undersigned's behalf, information of transactions in the Company's securities from any third-party, including brokers, employee benefit plan administrators and trustees, and the undersigned hereby authorizes any such person to release any such information to the undersigned and approves and ratifies any such release of information; and

(3)perform any and all other acts which in the discretion of such attorneys-in-fact is necessary or desirable for and on behalf of the undersigned in connection with the foregoing.

The undersigned acknowledges that:

(1)this Power of Attorney authorizes, but does not require, such attorneys-in-fact to act in his or her discretion on information provided to such attorneys-in-fact without independent verification of such information;

(2)any documents prepared, executed, acknowledged and/or delivered by such attorneys-in-fact on behalf of the undersigned pursuant to this Power of Attorney will be in such form and will contain such information and disclosure as such attorneys-in-fact, in his or her discretion, deems necessary or desirable;

(3)neither the Company nor such attorneys-in-fact assumes (i) any liability for the undersigned's responsibility to comply with the requirements of the Exchange Act, (ii) any liability of the undersigned for any failure to comply with such requirements or (iii) any obligation or liability of the undersigned for profit disgorgement under Section 16(b) of the Exchange Act; and

(4)this Power of Attorney does not relieve the undersigned from responsibility for compliance with the undersigned's obligations under the Exchange Act, including without limitation the reporting requirements under Section 16 of the Exchange Act.

The undersigned hereby gives and grants the foregoing attorneys-in-fact full power and authority to do and perform all and every act and thing whatsoever requisite, necessary or appropriate to be done in and about the foregoing matters as fully to all intents and purposes as the undersigned might or could do if present, hereby ratifying all that such attorneys-in-fact of, for and on behalf of the undersigned, shall lawfully do or cause to be done by virtue of this Power of Attorney.

This Power of Attorney shall remain in full force and effect until revoked by the undersigned in a signed writing delivered to such attorneys-in-fact.

------

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 17<sup>th</sup> day of April, 2026.

---

| | |
|:---|:---|
| **Madison Dearborn Partners, LLC** | **Madison Dearborn Partners, LLC** |
| By:  | /s/Katherine M. Bryan |
| Name: | Katherine M. Bryan |
| Its: | Director, Associate General Counsel and Chief Compliance Officer<br>|

---

---

| |
|:---|
| **Madison Dearborn Capital Partners VII-B, L.P.**<br>By: Madison Dearborn Partners VII-B, L.P. |
| Its: General Partner |
| By: Madison Dearborn Partners, LLC |
| Its: General Partner |

---

---

| | |
|:---|:---|
| By:  | /s/Katherine M. Bryan |
| Name: | Katherine M. Bryan |
| Its: | Director, Associate General Counsel and Chief Compliance Officer |

---

---

| |
|:---|
| **Madison Dearborn Capital Partners VII-C, L.P.**<br>By: Madison Dearborn Partners VII-A&C, L.P. |
| Its: General Partner |
| By: Madison Dearborn Partners, LLC |
| Its: General Partner |

---

---

| | |
|:---|:---|
| By:  | /s/Katherine M. Bryan |
| Name: | Katherine M. Bryan |
| Its: | Director, Associate General Counsel and Chief Compliance Officer |

---

*[Signature Page to Section 16 POA]*

------

---

| |
|:---|
| **Madison Dearborn Capital Partners VII Executive B, L.P.**<br>By: Madison Dearborn Partners VII-B, L.P. |
| Its: General Partner |
| By: Madison Dearborn Partners, LLC |
| Its: General Partner |

---

---

| | |
|:---|:---|
| By:  | /s/Katherine M. Bryan |
| Name: | Katherine M. Bryan |
| Its: | Director, Associate General Counsel and Chief Compliance Officer |

---

*[Signature Page to Section 16 POA]*

------

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>MADISON DEARBORN PARTNERS LLC<br><sub>(Last) (First) (Middle)</sub><br>C/O MADISON DEARBORN PARTNERS, LLC<br>70 W. MADISON STREET, SUITE 4600<br><sub>(Street)</sub><br>CHICAGO, IL 60602<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>AEVEX Corp. [ AVEX ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-04-17 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>MADISON DEARBORN CAPITAL PARTNERS VII-B, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O MADISON DEARBORN PARTNERS, LLC<br>70 W. MADISON STREET, SUITE 4600<br><sub>(Street)</sub><br>CHICAGO, IL 60602<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>AEVEX Corp. [ AVEX ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-04-17 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>MADISON DEARBORN CAPITAL PARTNERS VII EXECUTIVE-B, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O MADISON DEARBORN PARTNERS, LLC<br>70 W. MADISON STREET, SUITE 4600<br><sub>(Street)</sub><br>CHICAGO, IL 60602<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>AEVEX Corp. [ AVEX ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-04-17 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>MADISON DEARBORN CAPITAL PARTNERS VII-C, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O MADISON DEARBORN PARTNERS, LLC<br>70 W. MADISON STREET, SUITE 4600<br><sub>(Street)</sub><br>CHICAGO, IL 60602<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>AEVEX Corp. [ AVEX ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-04-17 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Class A Common Stock | 25135300 | I | See footnotes.<sup>(1)(2)</sup> |
| Class B Common Stock | 63297524 | I | See footnotes.<sup>(2)(3)</sup> |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Series B Units | <sup>(4)</sup> | <sup>(4)</sup> | Class A Common Stock | 63297524 | <sup>(4)</sup> | I | See footnotes.<sup>(2)(3)</sup> |

---

### Footnotes:

(1) The reported securities are directly held by ATS Pubco Holdings, LLC, which is controlled by Madison Dearborn Capital Partners VII-B, L.P., Madison Dearborn Capital Partners VII Executive-B, L.P. and Madison Dearborn Capital Partners VII-C, LP (collectively, the "MDP Funds").

(2) The ultimate general partner of each of the MDP Funds is Madison Dearborn Partners, LLC. Paul J. Finnegan and Vahe A. Dombalagian are the sole members of the board of managers of Madison Dearborn Partners, LLC, which has the power to vote or dispose of the securities held by the MDP Funds. By virtue of the relationships described herein, each of the reporting persons may be deemed to beneficially own the securities reported hereby. Each of the reporting persons disclaims beneficial ownership of the securities except to the extent of its pecuniary interest therein.

(3) The reported securities are directly held by ATS Investment Holdings, LLC, which is controlled by the MDP Funds.

(4) Series B Units of Athena Technology Solutions Holdings, LLC are exchangeable (together with an equal number of shares of Class B common stock) for shares of Class A common stock on a one-for-one basis. Series B Units do not expire.

**Remarks:**
Exhibit 24.1 - Power of Attorney

**Signature:** /s/ Katherine M. Bryan, Director, Associate General Counsel and Chief Compliance Officer of Madison Dearborn Partners, LLC  
**Date:** 2026-04-17

**Signature:** /s/ Katherine M. Bryan, Director, Associate General Counsel and Chief Compliance Officer of the General Partner of the General Partner of Madison Dearborn Capital Partners VII-B, L.P.  
**Date:** 2026-04-17

**Signature:** /s/ Katherine M. Bryan, Director, Associate General Counsel and Chief Compliance Officer Managing Director of the General Partner of the General Partner of Madison Dearborn Capital Partners VII Executive-B, L.P.  
**Date:** 2026-04-17

**Signature:** /s/ Katherine M. Bryan, Director, Associate General Counsel and Chief Compliance Officer Managing Director of the General Partner of the General Partner of Madison Dearborn Capital Partners VII-C, LP  
**Date:** 2026-04-17

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**