Mistras Group, Inc. (MG) Insider Ownership

Historic Insider Ownership Trends

As of April 28, 2026, the three largest insider holders of MG are Sotirios J. Vahaviolos (Executive Chairman, 3.89Mn shares), Aspasia Felice Vahaviolos (TenPercentOwner, 854.29K shares), Manuel N. Stamatakis (Executive Chairman, 509.80K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Sotirios J. Vahaviolos Executive Chairman 3,890,699 0 03 May, 2024
Aspasia Felice Vahaviolos - 854,292 0 16 Feb, 2026
Manuel N. Stamatakis Executive Chairman 509,795 0 10 Mar, 2026
Dennis Bertolotti President And Ceo 424,358 0 30 Mar, 2023
Nicholas Debenedictis - 241,958 0 21 May, 2025
Michael J. Lange Senior Evp 240,515 0 25 Sep, 2024
Jonathan H Wolk Sr. Evp And Coo 194,575 0 03 Jan, 2023
James J Forese - 170,181 0 21 May, 2025
Edward J Prajzner Sr. Evp And Cfo 148,076 0 23 Mar, 2026
Natalia Shuman-Fabbri President And Ceo 126,190 0 06 Mar, 2026
John Anthony Smith Executive Vice President 100,447 0 05 Apr, 2024
Michelle Lohmeier - 92,361 0 21 May, 2025
Michael C Keefe Evp, General Counsel 91,558 0 20 Mar, 2025
Charles P Pizzi - 66,618 0 05 Dec, 2025
Hanei Wail Hammad Evp Chief Operating Officer 61,777 0 26 Mar, 2026
Richard H Glanton - 61,569 0 21 May, 2025
Gennaro A. D'Alterio Evp, Chief Commercial Officer 47,239 0 10 Mar, 2026
Eileen Mary Coggins Evp, General Counsel 22,242 0 04 Mar, 2026
Richard H Glanton - 0 2,810 19 Aug, 2024

* 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
26 Mar, 2026 Hanei Wail Hammad Common Stock D 2,865 $15.10 61,777 D F
22 Mar, 2026 Edward J Prajzner Common Stock D 1,367 $14.05 148,076 D F
16 Mar, 2026 Edward J Prajzner Common Stock D 2,239 $14.61 149,443 D F
04 Mar, 2026 Gennaro A. D'Alterio Common Stock D 184 $15.68 47,239 D F
04 Mar, 2026 Manuel N. Stamatakis Common Stock D 814 $15.68 509,795 D F
04 Mar, 2026 Edward J Prajzner Common Stock D 698 $15.68 154,222 D F
04 Mar, 2026 Hanei Wail Hammad Common Stock D 337 $15.68 64,642 D F
07 Mar, 2026 Edward J Prajzner Common Stock D 2,540 $14.82 151,682 D F
25 Feb, 2026 Natalia Shuman-Fabbri Common Stock A 101,190 $0.00 126,190 D A
25 Feb, 2026 Eileen Mary Coggins Common Stock A 7,242 $0.00 22,242 D A
25 Feb, 2026 Manuel N. Stamatakis Common Stock A 86,310 $0.00 510,609 D A
25 Feb, 2026 Gennaro A. D'Alterio Common Stock A 19,905 $0.00 48,940 D A
25 Feb, 2026 Edward J Prajzner Common Stock A 37,202 $0.00 156,223 D A
28 Feb, 2026 Gennaro A. D'Alterio Common Stock D 655 $15.28 48,285 D F
28 Feb, 2026 Edward J Prajzner Common Stock D 1,303 $15.28 154,920 D F
28 Feb, 2026 Gennaro A. D'Alterio Common Stock D 862 $15.28 47,423 D F
31 Dec, 2025 Aspasia Felice Vahaviolos Common Stock D 5,251,358 $0.00 854,292 D G
02 Jan, 2026 Manuel N. Stamatakis Common Stock A 40,000 $0.00 424,299 D A
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