Mistras Group (MG)
Detects corrosion and structural fatigue in energy and industrial infrastructure through field inspection and monitoring instruments.
$20.87
After hours0.00 (0.00%)
At close$20.87(−0.57%)
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13F · 13D/G · Form 4
| Institutions | ≈ 60.49% | 19.27M shares | |
|---|---|---|---|
| 145 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail | |||
| Insiders | 80.20% | 25.54M shares | |
| 18 holders · as of Sep 22, 2026 | |||
| Strategic holders | 20.96% | 6.68M shares | |
| 2 holders · as of Feb 27, 2026 | |||
| Adds to | 161.65% | ||
31.85M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
These groups come from separate filings that can overlap, so they add to 161.65%; nothing is left for Other.
13F, as of Jun 30, 2026
145 holders · 19.27M shares · 27 new positions · 85 increased · 30 reduced · 16 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Mill Road Capital Management LLC | 1.93M | 6.06% | +58.9K | Aug 14, 2026 |
| Dimensional Fund Advisors LP | 1.70M | 5.34% | −2.9K | Aug 11, 2026 |
| Royce & Associates LP | 1.58M | 4.96% | +47.7K | Aug 14, 2026 |
| Weber Capital Management LLC /Adv | 1.45M | 4.55% | −8.8K | Aug 13, 2026 |
| BlackRock, Inc. | 1.17M | 3.66% | +306.7K | Aug 7, 2026 |
| Ies Holdings, Inc. | 1.12M | 3.53% | +3.7K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 1.05M | 3.30% | +122.3K | Aug 13, 2026 |
| Federated Hermes, Inc. | 656.0K | 2.06% | 0 | Aug 12, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Aspasia Vahaviolos | 19.32% | 6.11M | 13G | Mar 31, 2026 |
| Aspasia Felice Vahaviolosincl. Stephanie Athena Foglia, 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos | 19.10% | 6.08M | 13D | Sep 21, 2026 |
| Stephanie Fogliaincl. 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos | 18.60% | 5.92M | 13D | Jun 12, 2026 |
| Mill Road Capital III, L.P.incl. Thomas E. Lynch, Mill Road Capital III GP LLC | 6.10% | 1.94M | 13D | Sep 18, 2026 |
| Dimensional Fund Advisors LP | 5.20% | 1.62M | 13G | Jul 15, 2025 |
| Kristy Kyriakopoulos | 5.12% | 1.62M | 13G | Mar 31, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Apr 17, 2026 | Stephanie Athena Foglia10 percent owner | Sale | 1,000 | $18.00 | 1,692 |
| Mar 3, 2026 | Stephanie Athena Foglia10 percent owner | Sale | 1,000 | $15.50 | 2,692 |
| Feb 3, 2026 | Stephanie Athena Foglia10 percent owner | Sale | 1,000 | $14.60 | 3,692 |
| Jan 5, 2026 | Stephanie Athena Foglia10 percent owner | Sale | 1,000 | $13.60 | 4,692 |
| Sep 15, 2025 | Eileen Mary Cogginsofficer: EVP & Chief Legal Officer | Purchase · 2 lots | 40,000 | $9.55 | 40,000 |
House and Senate disclosures
Not reported.