Mistras EVP has 662 shares withheld for tax

Mistras Group, Inc. (MG) reported that EVP and Chief Commercial Officer Gennaro A. D'Alterio had 662 shares of common stock withheld on September 20, 2026 to pay income taxes arising from the vesting of restricted stock units.

Available on EDGAR 09/22/2026 - 10:04 AM EDT Accepted by SEC EDGAR 09/22/2026 - 10:04 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Mistras Group, Inc. (MG) reported that EVP and Chief Commercial Officer Gennaro A. D'Alterio had 662 shares of common stock withheld on September 20, 2026 to pay income taxes arising from the vesting of restricted stock units. After this tax-withholding disposition, he holds 46,577 shares of Mistras Group common stock directly. No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Tax Withholding: 662 shares

Tax Withholding 1 txn

Insider D'Alterio Gennaro A.

Role EVP, Chief Commercial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	662	$20.75	$14K

Holdings After Transaction: Common Stock — 46,577 shares (Direct)

Holdings Before and After: Common Stock, 47,239 to 46,577 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: 662 shares Share valuation for withholding: $20.75 per share Shares owned after transaction: 46,577 shares

3 metrics

Shares withheld for taxes 662 shares Common stock withheld on September 20, 2026 for tax liability on RSU vesting

Share valuation for withholding $20.75 per share Value applied to 662 shares withheld for tax liability

Shares owned after transaction 46,577 shares Direct common stock holdings of Gennaro A. D'Alterio after September 20, 2026

Key Terms

restricted stock units, tax liability, withheld for payment

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

"withheld for payment of tax liability as a result"

withheld for payment financial

"Represents shares withheld for payment of tax liability"

FAQ

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

What insider transaction did MG report for EVP and Chief Commercial Officer Gennaro A. D'Alterio?

Mistras Group reported that Gennaro A. D'Alterio had 662 shares of common stock withheld on September 20, 2026 to pay tax liability from vesting restricted stock units. This is a tax-withholding event rather than an open-market sale.

How many MG shares does Gennaro A. D'Alterio own after this Form 4 transaction?

Following the September 20, 2026 tax-withholding transaction, Gennaro A. D'Alterio directly owns 46,577 shares of Mistras Group common stock, as reported in the Form 4 filing.

At what price were the MG shares valued for the tax withholding transaction?

The 662 shares withheld for tax purposes were valued at $20.75 per share, according to the Form 4 disclosure for the September 20, 2026 transaction.

Was the MG insider transaction made under a Rule 10b5-1 trading plan?

No. The Form 4 indicates that the September 20, 2026 transaction by Gennaro A. D'Alterio was not made pursuant to a Rule 10b5-1 trading plan.

What caused the MG share withholding for Gennaro A. D'Alterio?

The Form 4 states that the 662 shares were withheld for payment of tax liability resulting from the vesting of restricted stock units held by Gennaro A. D'Alterio.

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

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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^*

D'Alterio Gennaro A.

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Commercial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/20/2026

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	09/20/2026		F		662(1)	D	$20.75	46,577	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 Gennaro A. D'Alterio	09/22/2026
	** 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)