Mistras Group, Inc.
MG- Exchange
- NYSE
- Industry
- Services-Engineering Services
- SEC CIK
- 0001436126
No open-market purchases or sales by Mistras Group, Inc. insiders were filed in the last 90 days; 137 institutions reported holding it in 13F filings for Q2 2026, worth $336.7M in total; no superinvestor holds it.
Holders of 5% or more of MG
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Mistras Group, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Foglia Stephanie Athena | 13D | 21.72%6.86M shares | +16.62 ppfrom 5.10% | Sep 11, 20252 filings | Mar 31, 2026 | SEC |
| Vahaviolos Aspasia Felice | 13G | 19.32%6.11M shares | −0.08 ppfrom 19.40% | Sep 11, 20252 filings | Mar 31, 2026 | SEC |
| Mill Road Capital III, L.P. | 13D/A | 5.70%1.76M shares | – | Mar 10, 20251 filing | Mar 10, 2025 | SEC |
| Dimensional Fund Advisors LP | 13G | 5.20%1.62M shares | New | Jul 15, 20251 filing | Jul 15, 2025 | SEC |
| Kyriakopoulos Kristy Vahaviolos | 13G/A | 5.12%1.62M shares | −0.18 ppfrom 5.30% | Sep 11, 20252 filings | Mar 31, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
8 Schedule 13D and 13G filings on Mistras Group, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Mar 31, 20264:25 PM ET | Kyriakopoulos Kristy Vahaviolos | 13G/A | 5.12%1.62M shares | −0.18 ppfrom 5.30% | Jul 8, 2025 | SEC |
| Mar 31, 20264:17 PM ET | Vahaviolos Aspasia Felice | 13G | 19.32%6.11M shares | −0.08 ppfrom 19.40% | Dec 31, 2025 | SEC |
| Mar 31, 20264:12 PM ET | Foglia Stephanie Athenaand 1 other | 13D | 21.72%6.86M shares | +16.62 ppfrom 5.10% | Dec 31, 2025 | SEC |
| Sep 11, 20254:52 PM ET | Foglia Stephanie Athena | 13G | 5.10%1.60M shares | New | Jul 8, 2025 | SEC |
| Sep 11, 20254:50 PM ET | Kyriakopoulos Kristy Vahaviolos | 13G | 5.30%1.67M shares | New | Jul 8, 2025 | SEC |
| Sep 11, 20254:50 PM ET | Vahaviolos Aspasia Felice | 13G | 19.40%6.11M shares | New | May 23, 2025 | SEC |
| Jul 15, 20254:03 PM ET | Dimensional Fund Advisors LP | 13G | 5.20%1.62M shares | New | Jun 30, 2025 | SEC |
| Mar 10, 20258:08 PM ET | Mill Road Capital III, L.P.and 2 others | 13D/A | 5.70%1.76M shares | – | Mar 6, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Mistras Group, Inc. shares.
No Form 144 notices for Mistras Group, Inc. are on file.