Mistras Group, Inc. (MG) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, the three largest insider holders of MG are Sotirios J. Vahaviolos (Director, 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 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
Jonathan H Wolk Sr. Evp And Coo 194,575 0 03 Jan, 2023
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
Charles P Pizzi 66,618 0 05 Dec, 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
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 Edward J Prajzner Common Stock D 698 $15.68 154,222 D F
04 Mar, 2026 Manuel N. Stamatakis Common Stock D 814 $15.68 509,795 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 Manuel N. Stamatakis Common Stock A 86,310 $0.00 510,609 D A
25 Feb, 2026 Edward J Prajzner Common Stock A 37,202 $0.00 156,223 D A
28 Feb, 2026 Edward J Prajzner Common Stock D 1,303 $15.28 154,920 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
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
04 Dec, 2025 Charles P Pizzi Common Stock D 2,150 $0.00 66,618 D G
02 Jul, 2025 Aspasia Felice Vahaviolos Common Stock A 2,217,087 $0.00 6,105,650 D W
02 Jul, 2025 Vahaviolos January 2023 2-Year Grantor Retained Annuity Trust Sotirios Common Stock D 4,685,578 $0.00 0 D G
08 Sep, 2025 Natalia Shuman-Fabbri Common Stock A 25,000 $0.00 25,000 D A
08 Sep, 2025 Natalia Shuman-Fabbri Stock Options (Right to Buy) A 35,000 $0.00 35,000 D A
05 Jun, 2025 Manuel N. Stamatakis Common Stock A 10,000 $7.71 384,299 D P