Mistras Group CEO has 2,410 shares withheld for taxes

Mistras Group’s CEO settled taxes on vested RSUs by withholding 2,410 shares and now holds 123,780 common shares directly.

Rhea-AI Filing Summary

Mistras Group, Inc. (MG) reported that President and CEO Natalia Shuman-Fabbri had 2,410 shares of Common Stock withheld on September 8, 2026 to pay tax liability arising from the vesting of restricted stock units. After this tax-withholding disposition, she directly holds 123,780 shares of Mistras Group common stock.

Insider Trade Summary

Tax Withholding: 2,410 shares

Tax Withholding 1 txn

Insider SHUMAN-FABBRI NATALIA

Role President and CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	2,410	$19.42	$47K

Holdings After Transaction: Common Stock — 123,780 shares (Direct)

Footnotes (1)

1. F1. Represents shares withheld for payment of tax liability as a result of the vesting of restricted stock units.

Key Figures

Shares withheld for taxes: 2,410 shares Price per share for withholding: $19.42 per share Shares held after transaction: 123,780 shares

3 metrics

Shares withheld for taxes 2,410 shares Withheld on September 8, 2026 to pay tax liability from RSU vesting

Price per share for withholding $19.42 per share Valuation used for the 2,410 shares withheld for tax liability

Shares held after transaction 123,780 shares Direct holdings of Mistras Group Common Stock by the CEO after the withholding

Key Terms

restricted stock units, tax liability, Common Stock

3 terms

restricted stock units financial

"as a result of the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax liability financial

"shares withheld for payment of tax liability as a result of the vesting"

Common Stock financial

"Represents shares of Common Stock withheld for payment of tax liability"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

FAQ

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

What insider transaction did MG’s CEO report in this Form 4?

Natalia Shuman-Fabbri reported that 2,410 shares of Mistras Group Common Stock were withheld on September 8, 2026 to pay tax liability triggered by the vesting of restricted stock units.

How many MG shares does the CEO hold after this reported transaction?

Following the reported tax-withholding transaction, President and CEO Natalia Shuman-Fabbri directly holds 123,780 shares of Mistras Group Common Stock.

Was the MG CEO’s Form 4 transaction a market sale or a tax withholding?

The Form 4 states the transaction was a payment of tax liability by delivering or withholding securities, with a footnote clarifying that the 2,410 shares represent shares withheld due to vesting of restricted stock units.

What price per share was used for the MG CEO’s tax-withholding shares?

The 2,410 shares withheld for tax purposes were valued at $19.42 per share in the Form 4, reflecting the price used to determine the tax-withholding amount.

Does this MG Form 4 indicate any Rule 10b5-1 trading plan?

No. The Form 4 indicates that the Rule 10b5-1 checkbox is not marked, and the transaction is described as shares withheld for payment of tax liability from vested restricted stock units rather than an open-market trading plan.

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

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Available on EDGAR 09/09/2026 - 08:18 PM Accepted by SEC EDGAR 09/09/2026 - 08:17 PM Learn about SEC filing dates

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^*

SHUMAN-FABBRI NATALIA

(Last) (First) (Middle)

C/O MISTRAS GROUP

195 CLARKSVILLE ROAD

(Street)

PRINCETON JUNCTION NEW JERSEY 08550

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/08/2026

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)

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	09/08/2026		F		2,410(1)	D	$19.42	123,780	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:

1. Represents shares withheld for payment of tax liability as a result of the vesting of restricted stock units.

	/s/ Laura Boswell, attorney-in-fact for Natalia Shuman-Fabbri	09/09/2026
	** 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)