Comparable stake leader
Aspasia Felice Vahaviolos
SEC ownership of Mistras Group, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001436126.
Disclosed value leader
Stephanie Athena Foglia
Comparable rows
50/50
Latest evidence
10 Jun 2026
- Public ticker
- MG on NYSE
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Aspasia Felice Vahaviolos
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Aspasia Felice Vahaviolos
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
10 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001436126
- Issuer location
- Princeton Junction, NJ
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Mistras Group, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Aspasia Felice Vahaviolos
Disclosed value leader
Stephanie Athena Foglia
Comparable rows
50/50
Latest evidence
10 Jun 2026
13D/G
3/4/5
13F
Lead comparable stake: 19%
13D/G row: Aspasia Felice Vahaviolos
Showing 1-8 of 50 holder rows.
Quick read
Aspasia Felice Vahaviolos leads the comparable SEC ownership view at 19%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Aspasia Felice Vahaviolos's linked filing trail.
Comparable ownership
Top 5
Aspasia Felice Vahaviolos
19%
Stephanie Athena Foglia
19%
Mill Road Capital III, L.P.
5.9%
DIMENSIONAL FUND ADVISORS LP
5.2%
Kristy Vahaviolos Kyriakopoulos
5.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Aspasia Felice Vahaviolos |
13D/G
3/4/5
Aspasia Vahaviolos · 10%+ Owner
|
19%
|
$95,736,592
6,105,650 shares
|
$0 | 31 Dec 2025 |
| Stephanie Athena Foglia |
13D/G
3/4/5
Stephanie Foglia · 10%+ Owner
|
19%
|
$101,656,379
5,917,135 shares
|
-$7,076,012 | 10 Jun 2026 |
| Mill Road Capital III, L.P. |
13D/G
|
5.9%
|
$27,647,172
1,870,580 shares
|
+$1,585,539 | 21 Apr 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13F
13D/G
Company
|
5.2%
from 13D/G
|
$25,180,276
1,703,681 shares
|
— | 31 Mar 2026 |
| Kristy Vahaviolos Kyriakopoulos |
13D/G
Kristy Kyriakopoulos
|
5.1%
|
$25,354,654
1,617,006 shares
|
$0 | 08 Jul 2025 |
| 2025 Irrevocable Two-Year Grantor Retained Annuity Trust of Aspasia F. Vahaviolos |
3/4/5
10%+ Owner
|
18%
|
$85,130,359
5,759,835 shares
|
-$61,700 | 10 Jun 2026 |
| Manuel N. Stamatakis |
3/4/5
Executive Chairman, Director
|
1.6%
|
$7,478,692
509,795 shares
|
— | 04 Mar 2026 |
| Nicholas DeBenedictis |
3/4/5
Director
|
0.86%
|
$4,047,059
273,820 shares
|
— | 19 May 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$123,400.
Buys
$0
Insiders: 0
Sells
$123,400
Insiders: 2
Net
-$123,400
Shares: -8,000
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 8,000
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 4,000 | $0 | $67,000 | -$67,000 |
| 6-9 | 0 | 4,000 | $0 | $56,400 | -$56,400 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 21 reporting-owner rows connected to Mistras Group, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
21
Largest Forms 3/4/5 holder
Stephanie Athena Foglia
Net 12M change
-$123,400
Latest report
10 Jun 2026
Recent insider transactions for Mistras Group, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Foglia Stephanie Athena | MG | Common Stock | Gift | -8.72% | -411,875 | 4,310,811 | 10 Jun 2026 | By GRAT | ||
| Stephanie Athena Foglia | MG | Common Stock | Gift | -8.72% | -411,875 | 4,310,811 | 10 Jun 2026 | By GRAT | ||
| Aspasia Felice Vahaviolos | MG | Common Stock | Gift | 29.8% | 411,875 | 1,794,839 | 10 Jun 2026 | Direct | ||
| Nicholas DeBenedictis | MG | Common Stock | Award | 2.84% | 6,862 | 248,820 | 19 May 2026 | Direct | ||
| Richard H. Glanton | MG | Common Stock | Award | 11.2% | 6,862 | 68,431 | 19 May 2026 | Direct | ||
| James J. Forese | MG | Common Stock | Award | 4.03% | 6,862 | 177,043 | 19 May 2026 | Direct | ||
| Michelle J. Lohmeier | MG | Common Stock | Award | 7.43% | 6,862 | 99,223 | 19 May 2026 | Direct | ||
| Charles P. Pizzi | MG | Common Stock | Award | 10.3% | 6,862 | 73,480 | 19 May 2026 | Direct | ||
| Foglia Stephanie Athena | MG | Common Stock | Gift | -10.1% | -528,672 | 4,722,686 | 27 Apr 2026 | By GRAT | ||
| Stephanie Athena Foglia | MG | Common Stock | Gift | -10.1% | -528,672 | 4,722,686 | 27 Apr 2026 | By GRAT | ||
| Foglia Stephanie Athena | MG | Common Stock | Sale | -37.2% | $18,000 | $18.00 | -1,000 | 1,692 | 17 Apr 2026 | By Spouse |
| Stephanie Athena Foglia | MG | Common Stock | Sale | -37.2% | $18,000 | $18.00 | -1,000 | 1,692 | 17 Apr 2026 | By Spouse |
| Hanei W. Hammad | MG | Common Stock | Tax liability | -4.43% | -2,865 | 61,777 | 26 Mar 2026 | Direct | ||
| Edward J. Prajzner | MG | Common Stock | Tax liability | -0.91% | -1,367 | 148,076 | 22 Mar 2026 | Direct | ||
| Edward J. Prajzner | MG | Common Stock | Tax liability | -1.48% | -2,239 | 149,443 | 16 Mar 2026 | Direct | ||
| Edward J. Prajzner | MG | Common Stock | Tax liability | -1.65% | -2,540 | 151,682 | 07 Mar 2026 | Direct | ||
| Manuel N. Stamatakis | MG | Common Stock | Tax liability | -0.16% | -814 | 509,795 | 04 Mar 2026 | Direct | ||
| Hanei W. Hammad | MG | Common Stock | Tax liability | -0.52% | -337 | 64,642 | 04 Mar 2026 | Direct | ||
| Edward J. Prajzner | MG | Common Stock | Tax liability | -0.45% | -698 | 154,222 | 04 Mar 2026 | Direct | ||
| Gennaro A. D'Alterio | MG | Common Stock | Tax liability | -0.39% | -184 | 47,239 | 04 Mar 2026 | Direct | ||
| Foglia Stephanie Athena | MG | Common Stock | Sale | -27.1% | $15,500 | $15.50 | -1,000 | 2,692 | 03 Mar 2026 | By Spouse |
| Stephanie Athena Foglia | MG | Common Stock | Sale | -27.1% | $15,500 | $15.50 | -1,000 | 2,692 | 03 Mar 2026 | By Spouse |
| Edward J. Prajzner | MG | Common Stock | Tax liability | -0.83% | -1,303 | 154,920 | 28 Feb 2026 | Direct | ||
| Gennaro A. D'Alterio | MG | Common Stock | Tax liability | -3.1% | -1,517 | 47,423 | 28 Feb 2026 | Direct | ||
| Hammad Hanei Wail | MG | Common Stock | Award | 50.8% | 29,762 | 88,357 | 25 Feb 2026 | Direct | ||
| Natalia Shuman-Fabbri | MG | Common Stock | Award | 404.8% | 101,190 | 126,190 | 25 Feb 2026 | Direct | ||
| Manuel N. Stamatakis | MG | Common Stock | Award | 20.3% | 86,310 | 510,609 | 25 Feb 2026 | Direct | ||
| Edward J. Prajzner | MG | Common Stock | Award | 31.3% | 37,202 | 156,223 | 25 Feb 2026 | Direct | ||
| Eileen Mary Coggins | MG | Common Stock | Award | 48.3% | 7,242 | 22,242 | 25 Feb 2026 | Direct | ||
| Gennaro A. D'Alterio | MG | Common Stock | Award | 68.6% | 19,905 | 48,940 | 25 Feb 2026 | Direct | ||
| Foglia Stephanie Athena | MG | Common Stock | Sale | -21.3% | $14,600 | $14.60 | -1,000 | 3,692 | 03 Feb 2026 | By Spouse |
| Stephanie Athena Foglia | MG | Common Stock | Sale | -21.3% | $14,600 | $14.60 | -1,000 | 3,692 | 03 Feb 2026 | By Spouse |
| Foglia Stephanie Athena | MG | Common Stock | Sale | -17.6% | $13,600 | $13.60 | -1,000 | 4,692 | 05 Jan 2026 | By Spouse |
| Stephanie Athena Foglia | MG | Common Stock | Sale | -17.6% | $13,600 | $13.60 | -1,000 | 4,692 | 05 Jan 2026 | By Spouse |
| Edward J. Prajzner | MG | Common Stock | Tax liability | -2.22% | -2,699 | 119,021 | 05 Jan 2026 | Direct | ||
| Manuel N. Stamatakis | MG | Common Stock | Award | 10.4% | 40,000 | 424,299 | 02 Jan 2026 | Direct | ||
| Aspasia Felice Vahaviolos | MG | Common Stock | Gift | 61.9% | 528,672 | 1,382,964 | 31 Dec 2025 | Direct | ||
| Aspasia Felice Vahaviolos | MG | Common Stock | Gift | -86% | -5,251,358 | 854,292 | 31 Dec 2025 | Direct | ||
| Charles P. Pizzi | MG | Common Stock | Gift | -3.13% | -2,150 | 66,618 | 04 Dec 2025 | Direct | ||
| Gennaro A. D'Alterio | MG | Common Stock | Tax liability | -1.61% | -475 | 29,035 | 24 Sep 2025 | Direct | ||
| Eileen Mary Coggins | MG | Common Stock | Award | 15,000 | 15,000 | 15 Sep 2025 | Direct | |||
| Eileen Mary Coggins | MG | Right to buy | Award | 25,000 | 25,000 | 15 Sep 2025 | Direct | |||
| Natalia Shuman-Fabbri | MG | Common Stock | Award | 25,000 | 25,000 | 08 Sep 2025 | Direct | |||
| Natalia Shuman-Fabbri | MG | Stock Options (Right to Buy) | Award | 35,000 | 35,000 | 08 Sep 2025 | Direct |
* marks a reported price that did not pass the local price check.