Mistras Group, Inc. (MG) Insider Ownership

Historic Insider Ownership Trends

Through the 90-day period concluding February 19, 2026, Mistras's top three insider stakeholders include TenPercentOwner Aspasia Felice Vahaviolos (6.11Mn shares), Director Sotirios J. Vahaviolos (3.89Mn shares), President And Ceo Dennis Bertolotti (424.36K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares Report Date
Aspasia Felice Vahaviolos 6,105,650 10 Sep, 2025
Sotirios J. Vahaviolos 3,890,699 03 May, 2024
Dennis Bertolotti President And Ceo 424,358 30 Mar, 2023
Manuel N. Stamatakis Executive Chairman 424,299 09 Jan, 2026
Nicholas Debenedictis 266,958 21 May, 2025
Michael J. Lange Senior Evp 240,515 25 Sep, 2024
Jonathan H Wolk Sr. Evp And Coo 194,575 03 Jan, 2023
James J Forese 170,181 21 May, 2025
Edward J Prajzner Sr. Evp And Cfo 119,021 09 Jan, 2026
John Anthony Smith Executive Vice President 100,447 05 Apr, 2024
Michelle Lohmeier 92,361 21 May, 2025
Michael C Keefe Evp And General Counsel 91,558 20 Mar, 2025
Charles P Pizzi 66,618 05 Dec, 2025
Hanei Wail Hammad Evp & Chief Operating Officer 64,979 06 Mar, 2025
Richard H Glanton 64,379 21 May, 2025
Gennaro A. D'Alterio Evp And Chief Commercial Officer 29,035 04 Dec, 2025
Natalia Shuman-Fabbri President And Ceo 25,000 10 Sep, 2025
Eileen Mary Coggins Evp & Chief Legal Officer 15,000 01 Oct, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
05 Jan, 2026 Edward J Prajzner Common Stock D 2,699 $12.65 119,021 D F
05 Jan, 2026 Edward J Prajzner Common Stock D 2,699 $12.65 119,021 D F
02 Jan, 2026 Manuel N. Stamatakis Common Stock A 40,000 $0.00 424,299 D A
02 Jan, 2026 Manuel N. Stamatakis Common Stock A 40,000 $0.00 424,299 D A
04 Dec, 2025 Charles P Pizzi Common Stock D 2,150 $0.00 66,618 D G
04 Dec, 2025 Charles P Pizzi - - 66,618 D
24 Sep, 2025 Gennaro A. D'Alterio Common Stock D 475 $9.53 29,035 D F
24 Sep, 2025 Gennaro A. D'Alterio - - 29,035 D
15 Sep, 2025 Eileen Mary Coggins - - 15,000 D
15 Sep, 2025 Eileen Mary Coggins Common Stock A 15,000 $9.55 15,000 D P
15 Sep, 2025 Eileen Mary Coggins Common Stock A 15,000 $0.00 15,000 D A
08 Sep, 2025 Natalia Shuman-Fabbri Common Stock A 25,000 $0.00 25,000 D A
08 Sep, 2025 Natalia Shuman-Fabbri - - 25,000 D
02 Jul, 2025 Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust Sotirios - - 0 D
02 Jul, 2025 Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust Sotirios Common Stock D 4,685,578 $0.00 0 D G
02 Jul, 2025 Aspasia Felice Vahaviolos Common Stock A 2,217,087 $0.00 6,105,650 D W
05 Jun, 2025 Manuel N. Stamatakis - - 384,299 D
05 Jun, 2025 Manuel N. Stamatakis Common Stock A 10,000 $7.71 384,299 D P
19 May, 2025 Richard H Glanton Common Stock A 14,447 $0.00 61,569 D A
19 May, 2025 Richard H Glanton - - 61,569 D