Mistras CLO has 1,636 shares withheld for tax

Mistras Group’s chief legal officer had shares withheld to satisfy taxes on vested RSUs, leaving her with 13,364 MG shares.

Rhea-AI Filing Summary

Mistras Group, Inc. (MG) reported that Chief Legal Officer Eileen Mary Coggins had 1,636 shares of common stock withheld on September 18, 2026 to cover tax liability from the vesting of restricted stock units. After this tax-withholding disposition, she directly holds 13,364 shares of Mistras Group common stock.

Insider Trade Summary

Tax Withholding: 1,636 shares

Tax Withholding 1 txn

Insider Coggins Eileen Mary

Role Chief Legal Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	1,636	$19.66	$32K

Holdings After Transaction: Common Stock — 13,364 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: 1,636 shares Price per share for tax withholding: $19.66 per share Shares held after transaction: 13,364 shares +1 more

4 metrics

Shares withheld for taxes 1,636 shares Withheld on September 18, 2026 to pay tax liability on vested RSUs

Price per share for tax withholding $19.66 per share Value used for the 1,636 withheld shares

Shares held after transaction 13,364 shares Direct common stock ownership by Coggins after September 18, 2026

Shares related to exercise price or tax liability 1,636 shares Total shares reported under code F for payment of tax liability

Key Terms

restricted stock units, tax liability, withheld

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 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 Eileen Mary Coggins?

Mistras Group reported that Chief Legal Officer Eileen Mary Coggins had 1,636 shares of common stock withheld on September 18, 2026 to pay tax liability arising from the vesting of restricted stock units.

How many MG shares were involved in the tax-withholding transaction?

The transaction involved 1,636 shares of Mistras Group common stock, which were withheld to satisfy Coggins’ tax liability related to vested restricted stock units.

What is Eileen Mary Coggins’ MG shareholding after this Form 4 event?

Following the September 18, 2026 tax-withholding disposition, Chief Legal Officer Eileen Mary Coggins directly owns 13,364 shares of Mistras Group common stock.

Was the MG insider transaction a market sale or a tax withholding?

It was a tax withholding transaction. The Form 4 states the 1,636 shares represent shares withheld for payment of tax liability due to the vesting of restricted stock units, not an open-market sale.

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

No. The filing indicates that the Rule 10b5-1 plan checkbox is not selected, and the footnote describes the event as shares withheld for payment of tax liability on vested restricted stock units.

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

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Available on EDGAR 09/18/2026 - 06:35 PM Accepted by SEC EDGAR 09/18/2026 - 06:35 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^*

Coggins Eileen Mary

(Last) (First) (Middle)

195 CLARKSVILLE ROAD

(Street)

PRINCETON JCT 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)
	Chief Legal Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/18/2026

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	09/18/2026		F		1,636(1)	D	$19.66	13,364	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 Eileen Mary Coggins	09/18/2026
	** 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)