[Form 4] Mistras Group Inc. Insider Trading Activity

Rhea-AI Filing Summary

Aspasia Vahaviolos, a director of Mistras Group, Inc. (MG), reported an acquisition of common stock on 07/02/2025. The Form 4 shows 2,217,087 shares acquired at a reported price of $0, and lists total beneficial ownership of 6,105,650 shares following the transaction. The filing indicates no derivative securities were reported. The Form 4 was signed by an attorney-in-fact, Michael C. Keefe, on 09/10/2025. No additional transaction details or explanatory notes appear in the document.

Insights

Securities Analyst

TL;DR: Director reported a large non-derivative share acquisition increasing beneficial ownership to 6.1M shares.

The filing records a non-derivative acquisition of 2,217,087 shares by Aspasia Vahaviolos on 07/02/2025, with reported price $0 and resulting beneficial ownership of 6,105,650 shares. The Form 4 contains no derivatives or explanatory notes that clarify the $0 price or the acquisition mechanism. For investors, the raw numbers are material because of the size of the reported share position, but the absence of contextual details (e.g., whether shares were vested, granted, converted, or transferred) limits interpretation.

Corporate Governance Expert

TL;DR: Director-level insider reported a significant change in ownership; documentation lacks transaction context.

The report identifies Aspasia Vahaviolos as a director and the sole reporting person for this filing. It documents a sizeable acquisition of common stock and a post-transaction beneficial ownership total. The form is signed by an attorney-in-fact. The filing does not include narrative explanation or a transaction code interpretation, which constrains governance analysis because the nature and intent of the transfer are not specified in the document itself.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Vahaviolos Aspasia Felice

(Last) (First) (Middle)

C/O MISTRAS GROUP

195 CLARKSVILLE ROAD

(Street)

PRINCETON JUNCTION 08550

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Mistras Group, Inc. [ MG ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
07/02/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/02/2025		W	V	2,217,087	A	$0	6,105,650	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

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

FAQ

What did Aspasia Vahaviolos report on the Form 4 for Mistras Group (MG)?

The Form 4 reports an acquisition of 2,217,087 shares of common stock on 07/02/2025, with total beneficial ownership of 6,105,650 shares following the transaction.

What price was reported for the shares acquired in the MG Form 4?

The filing lists a reported price of $0 for the 2,217,087 shares; the Form provides no additional explanation for the price.

Was any derivative security reported in this Form 4 for MG?

No. Table II for derivative securities contains no reported entries; only non-derivative common stock is listed.

Who signed the Form 4 for Aspasia Vahaviolos?

The Form 4 was signed by Michael C. Keefe, attorney-in-fact for Aspasia Vahaviolos, with a signature date of 09/10/2025 shown on the document.

Is the reporting person an officer or director of Mistras Group (MG)?

Yes. The filing marks the reporting person as a Director of Mistras Group, Inc.