# EDGAR Filing Document

**Accession Number:** 0002082296
**File Stem:** 0001127602-25-021252
**Filing Date:** 2025-9
**Character Count:** 7511
**Document Hash:** 06a124ae802fac5e761800ac00229328
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001127602-25-021252.hdr.sgml**: 20250910

**ACCESSION NUMBER**: 0001127602-25-021252

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250523

**FILED AS OF DATE**: 20250910

**DATE AS OF CHANGE**: 20250910

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Vahaviolos Aspasia Felice
- **CENTRAL INDEX KEY:** 0002082296

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34481
- **FILM NUMBER:** 251305956

**MAIL ADDRESS:**
- **STREET 1:** 7 RIDGEVIEW ROAD
- **CITY:** PRINCETON
- **STATE:** NJ
- **ZIP:** 08540
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Mistras Group, Inc.
- **CENTRAL INDEX KEY:** 0001436126
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-ENGINEERING SERVICES [8711]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 223341267
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 195 CLARKSVILLE ROAD
- **CITY:** PRINCETON JUNCTION
- **STATE:** NJ
- **ZIP:** 08550
- **BUSINESS PHONE:** 609-716-4000

**MAIL ADDRESS:**
- **STREET 1:** 195 CLARKSVILLE ROAD
- **CITY:** PRINCETON JUNCTION
- **STATE:** NJ
- **ZIP:** 08550

## Ex-24

```

POWER OF ATTORNEY

The undersigned, being a person required to file reports pursuant to
Section 16 of the Securities Exchange Act of 1934 ("Section 16")
regarding the undersigned's beneficial ownership of equity securities in
Mistras Group, Inc. (the "Company"), hereby constitute and appoint each
of Michael Keefe, Edward Prajzner and Michael Kozole, signing
singly,as my true and lawful attorney-in-fact to:

(1)	prepare, execute in my name and on my behalf, and submit to the
U.S. Securities and Exchange Commission (the "SEC") a Form ID, including
amendments thereto, and any other documents necessary or appropriate to
obtain codes and passwords enabling me to make electronic filings with
the SEC of reports required by Sections 13 or 16 or any rule or regulation
of the SEC;

(2)	(2)	execute for and on my behalf, as a Section 16 reporting
person of the Company, Forms 3, 4, and 5 in accordance with Section 16
and the rules thereunder, Schedule 13G or 13D in accordance with
Section 13 and the rules thereunder, and any other forms or reports I
may be required to file in connection with my ownership, acquisition,
or disposition of securities of the Company; ;

(3)	(3)	do and perform any and all acts for and on my behalf
which may be necessary or desirable to complete and execute any such
Form 3, 4, or 5, Schedule 13G or 13D, or other form or report in
connection with my ownership, acquisition, or disposition of securities
of the Company, and file such form or report with the SEC and any stock
exchange or similar authority; and

(4)	take any other action of any type whatsoever in connection with
the foregoing which, in the opinion of such attorney-in-fact, may be to my
benefit, in my interest, or legally required by me, it being understood
that the documents executed by such attorney-in-fact on my behalf pursuant
to this Power of Attorney shall be in such form and shall contain such
terms and conditions as such attorney-in-fact may approve in such
attorney-in-fact's discretion.

	I hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the
rights and powers herein granted, as fully to all intents and purposes as
I might or could do if personally present, with full power
of substitution or revocation, hereby ratifying and confirming all that
such attorney-in-fact, or such attorney-in-fact's substitute or substitutes,
shall lawfully do or cause to be done by virtue of this Power of Attorney
and the rights and powers herein granted. I acknowledge that the foregoing
attorneys-in-fact, in serving in such capacity at my request, are not
assuming, nor is the Company assuming, any of my responsibilities to comply
with Sections 13 or 16.

	This Power of Attorney shall remain in full force and effect until
I am no longer required to file Forms 3, 4, and 5 or Schedules 13G or 13D
with respect to my holdings of and transactions in securities of the
Company, unless earlier revoked by me.  By executing this Power of Attorney,
I revoke all powers of attorney previously executed by me regarding the
powers and authority granted in this Power of Attorney.

Dated:  July 31, 2025

						 /s/ Aspasia Vahaviolos
						   Aspasia Vahaviolos

```

### 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>Vahaviolos Aspasia Felice<br><sub>(Last) (First) (Middle)</sub><br>C/O MISTRAS GROUP<br>195 CLARKSVILLE ROAD<br><sub>(Street)</sub><br>PRINCETON JUNCTION,  08550<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Mistras Group, Inc. [ MG ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-05-23 | **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>[X] Form filed by One Reporting Person<br>[ ] 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 |
| Common Stock | 3888563 | D |  |

---

## 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 |
|  |  |  |  |  |  |  |  |

---

**Signature:** /s/ Michael C. Keefe, attorney-in-fact for Aspasia Vahaviolos  
**Date:** 2025-09-10

### 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.**