As of November 6, 2026, Mistras Group, Inc. is a publicly traded company (NYSE: MG). The largest holder reporting an active stake on Schedule 13D is Stephanie Athena Foglia, at 19.1%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include Aspasia Vahaviolos (19.32%), Aspasia Felice Vahaviolos (19.2%), Kristy Kyriakopoulos (5.12%) (Schedule 13D/A, October 7, 2026).
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Is Mistras Group, Inc. a real, registered company?
- Mistras Group, Inc. files with the SEC under CIK 1436126 (its SEC filings).
- Its shares are listed under the ticker MG on NYSE (SEC company record).
- Incorporated in Delaware; business address in Princeton Junction, New Jersey, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under Mistras Group, Inc. in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Stephanie Athena Foglia (filed 2026-10-07).
Who are Mistras Group, Inc.'s owners and officers?
Mistras Group, Inc.: incorporated in Delaware; business address in Princeton Junction, New Jersey; industry Services-Engineering Services (Schedule 13D/A, 2026-10-07).
| Report | Holder | Share |
|---|---|---|
| Schedule 13D/A, 2026-10-07 | Stephanie Athena Foglia | 19.1% |
| Schedule 13D/A, 2026-09-21 | Stephanie Athena Foglia | 19.1% |
| Schedule 13D/A, 2026-09-18 | Mill Road Capital Iii, L.P. | 6.1% |
| Schedule 13D/A, 2026-09-14 | Stephanie Athena Foglia | 17.4% |
| Schedule 13G/A, 2026-08-13 | Aspasia Felice Vahaviolos | 19.2% |
| Schedule 13D/A, 2026-06-12 | Stephanie Foglia | 18.6% |
| Schedule 13D/A, 2026-06-04 | Stephanie Foglia | 19.89% |
| Schedule 13D/A, 2026-04-23 | Mill Road Capital Iii, L.P. | 5.9% |
| Schedule 13G, 2026-03-31 | Aspasia Vahaviolos | 19.32% |
| Schedule 13D, 2026-03-31 | Stephanie Foglia | 21.72% |
| Schedule 13G/A, 2026-03-31 | Kristy Kyriakopoulos | 5.12% |
| Schedule 13G, 2025-09-11 | Aspasia Vahaviolos | 19.4% |
Questions about who owns Mistras Group, Inc.
Who owns Mistras Group, Inc.?
On this page, 6 holders' latest ownership filings report 5% or more of Mistras Group, Inc.: Aspasia Vahaviolos (19.32%, Schedule 13G, filed 2026-03-31), Aspasia Felice Vahaviolos (19.2%, Schedule 13G/A, filed 2026-08-13), Stephanie Athena Foglia (19.1%, Schedule 13D/A, filed 2026-10-07), Stephanie Foglia (18.6%, Schedule 13D/A, filed 2026-06-12) and Mill Road Capital Iii, L.P. (6.1%, Schedule 13D/A, filed 2026-09-18); 1 more is listed above.
Who are the largest shareholders of Mistras Group, Inc.?
By the share each holder's latest filing reports, the largest holders of Mistras Group, Inc. on this page are Aspasia Vahaviolos (19.32%), Aspasia Felice Vahaviolos (19.2%) and Stephanie Athena Foglia (19.1%).
When did Aspasia Vahaviolos buy into Mistras Group, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Aspasia Vahaviolos on this page is the Schedule 13G, filed 2025-09-11, reporting 19.4%; its latest, Schedule 13G filed 2026-03-31, reports 19.32%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on Mistras Group, Inc. covers
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What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
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Sources
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Which insiders own Mistras Group, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos, a 10% owner: 5,339,200 shares (16.8% of shares outstanding), 1,393,324 held directly and 3,945,876 indirectly, on a joint filing (Form 4, 2026-09-14).
- , a 10% owner: 5,339,200 shares (16.8% of shares outstanding), 1,393,324 held directly and 3,945,876 indirectly, on a joint filing (Form 4, 2026-09-14).
- , a 10% owner: 2,160,790 shares (6.8% of shares outstanding) (Form 4/A, 2026-10-07).
- , the chairman and a director: 509,795 shares (1.6% of shares outstanding) (Form 4, 2026-03-10).
- , a director: 273,820 shares (0.86% of shares outstanding), 248,820 held directly and 25,000 indirectly (Form 4, 2026-05-21).
Shares outstanding: 31,867,074 as of 2026-10-30, from the company's latest SEC cover page.
How much has Mistras Group, Inc. raised?
No fundraising or offering filing from Mistras Group, Inc. is on file with us.
Keep reading
More on Mistras Group, Inc. and the records around it.
Mistras Group, Inc. elsewhere on the record
- 5%+ stake filings Oct 2026
Companies that share a holder
- Mill Road Capital III, L.P. also filed stake reports on 2 other companies: Alta Equipment Group Inc. (Jan 2026), Landsea Homes Corporation (Jul 2025)
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
Related pages
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