Mistras Group
Detects corrosion and structural fatigue in energy and industrial infrastructure through field inspection and monitoring instruments.
$18.49
After-hours close0.00 (0.00%)
At close$18.49(−3.95%)
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Breakdown13F · Form 4
Institutions 60.75%19.33M sharesInsiders 5.26%1.67M sharesOther 33.99%10.81M shares
Shares outstanding 31.82M · Float 19.48M · 61.2% free float
Institutions13F, as of Jun 30, 2026
145 holders · 19.33M shares · 27 new positions · 86 increased · 29 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 | 5.35% | −2.9K | Aug 11, 2026 |
| Royce & Associates LP | 1.58M | 4.97% | +47.7K | Aug 14, 2026 |
| Weber Capital Management LLC /Adv | 1.45M | 4.55% | −8.8K | Aug 13, 2026 |
| BlackRock, Inc. | 1.17M | 3.67% | +306.7K | Aug 7, 2026 |
| Ies Holdings, Inc. | 1.12M | 3.53% | +3.7K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 1.05M | 3.31% | +122.3K | Aug 13, 2026 |
| Federated Hermes, Inc. | 656.0K | 2.06% | 0 | Aug 12, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Aspasia Vahaviolos | 19.32% | 6.11M | 13G | Mar 31, 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 | 5.90% | 1.87M | 13D | Apr 23, 2026 ↗ |
| Dimensional Fund Advisors LP | 5.20% | 1.62M | 13G | Jul 15, 2025 ↗ |
| Kristy Kyriakopoulos | 5.12% | 1.62M | 13G | Mar 31, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Foglia Stephanie Athena | 10 percent owner | 5.70M | 17.93% | Jun 12, 2026 |
| 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos | 10 percent owner | 5.25M | 16.51% | Feb 27, 2026 |
| Vahaviolos Aspasia Felice | 10 percent owner | 1.79M | 5.64% | Jun 12, 2026 |
| Manuel N. Stamatakis | director, officer: Executive Chairman | 509.8K | 1.60% | Mar 10, 2026 |
| Nicholas Debenedictis | director | 248.8K | 0.78% | May 21, 2026 |
| James J. Forese | director | 177.0K | 0.56% | May 21, 2026 |
| Edward J. Prajzner | officer: Sr. EVP and CFO | 148.1K | 0.47% | Mar 23, 2026 |
| Natalia Shuman-Fabbri | director, officer: President and CEO | 126.2K | 0.40% | Mar 6, 2026 |
| Michelle Lohmeier | director | 99.2K | 0.31% | May 21, 2026 |
| Michael C. Keefe | officer: EVP, General Counsel | 91.6K | 0.29% | Mar 20, 2025 |
3 ten-percent owners hold 12.75M shares by Form 4, outside the officers-and-directors figure above · 16 people have not refiled in the last 18 months (12.21M shares), so they are not in the figure above
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 |
CongressHouse and Senate disclosures
Not reported.