Mistras Group corrects insider holdings by 21,142 shares

Q: How many shares did Aspasia Felice Vahaviolos receive in the MG transaction?

Aspasia Felice Vahaviolos received 387,093 common shares on September 10, 2026, as an ordinary-course annuity payment from the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos.

Q: How many MG shares did Aspasia Felice Vahaviolos hold after the transaction?

Her reported direct holdings after the transaction were 2,160,790 shares. The reported amount was adjusted retroactively to reflect a reduction of 21,142 shares following reconciliation against the reporting person's internal records.

Her reported direct position after the transfer was 2,160,790 shares, following a retroactive 21,142-share reduction adjustment.

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Form Type

4/A

Rhea-AI Filing Summary

Mistras Group, Inc. (MG) 10% owner Aspasia Felice Vahaviolos received 387,093 common shares on September 10, 2026, as an ordinary-course annuity payment from the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos. Her reported direct holdings after the transaction were 2,160,790 shares. The reported amount was adjusted retroactively to reflect a reduction of 21,142 shares after reconciliation against the reporting person's internal records; the amendment corrects a clerical error in the previously reported amount.

Insider Trade Summary

387,093 shares gifted

Gift 1 txn

Insider Vahaviolos Aspasia Felice

Role 10% Owner

Type	Security	Shares	Price	Value
Gift	Common Stock ^{F1, F2, F3}	387,093	$0.00	$0.00

Holdings After Transaction: Common Stock — 2,160,790 shares (Direct)

Footnotes (3)

F1. Represents an ordinary course annuity payment made by the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos ("GRAT") to the reporting person pursuant to the terms of the GRAT.
F2. The amount was adjusted retroactively to reflect a reduction of 21,142 shares due to a reconciliation of the amounts previously reported against the reporting person's internal records.
F3. Amended solely to correct a clerical error in the amount previously reported in Column 5.

Key Figures

Common shares received: 387,093 shares Direct holdings after transaction: 2,160,790 shares Retroactive reduction: 21,142 shares

3 metrics

Common shares received 387,093 shares September 10, 2026 annuity payment

Direct holdings after transaction 2,160,790 shares Reported following the transaction

Retroactive reduction 21,142 shares Adjustment after reconciliation against the reporting person's internal records

Key Terms

Grantor Retained Annuity Trust, annuity payment

2 terms

Grantor Retained Annuity Trust financial

"2025 Irrevocable Two-Year Grantor Retained Annuity Trust"

A grantor retained annuity trust (GRAT) is an estate-planning tool where the person who creates the trust transfers assets into it but receives fixed cash payments (an annuity) from the trust for a set number of years; whatever remains after that term passes to designated beneficiaries. It matters to investors because it can shift future appreciation of assets out of the creator’s taxable estate—like putting an asset into a timed vending machine that pays you fixed amounts while any extra value that grows inside the machine goes to heirs with reduced gift or estate tax consequences.

annuity payment financial

"ordinary course annuity payment"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many shares did Aspasia Felice Vahaviolos receive in the MG transaction?

Aspasia Felice Vahaviolos received 387,093 common shares on September 10, 2026, as an ordinary-course annuity payment from the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos.

How many MG shares did Aspasia Felice Vahaviolos hold after the transaction?

Her reported direct holdings after the transaction were 2,160,790 shares. The reported amount was adjusted retroactively to reflect a reduction of 21,142 shares following reconciliation against the reporting person's internal records.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/07/2026 - 04:21 PM Accepted by SEC EDGAR 10/07/2026 - 04:20 PM

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
Estimated average burden
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)

7 RIDGEVIEW ROAD

(Street)

PRINCETON

NEW JERSEY

08540

(City)

(State)

(Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/10/2026

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

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

4. If Amendment, Date of Original Filed (Month/Day/Year)
09/14/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	09/10/2026		G⁽¹⁾		387,093	A	$0	2,160,790⁽²⁾⁽³⁾	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Represents an ordinary course annuity payment made by the 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos ("GRAT") to the reporting person pursuant to the terms of the GRAT.

2. The amount was adjusted retroactively to reflect a reduction of 21,142 shares due to a reconciliation of the amounts previously reported against the reporting person's internal records.

3. Amended solely to correct a clerical error in the amount previously reported in Column 5.

	/s/ Aspasia Vahaviolos	10/07/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR