Who owns Mistras Group, Inc. (MG)
Which tracked institutional funds hold MG, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MG company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on MG is one-sided between 2025-Q4 and 2026-Q1: 34 added or opened and 11 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MG’s largest tracked holder by dollar value, Mill Road Capital Management LLC, sizes it at 14.5% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 14.5pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MG divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 129 tracked filers holding MG, 58 increased or opened the position and 60 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MG between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 9
- VANGUARD CAPITAL MANAGEMENT LLC$14M
- ESSEX INVESTMENT MANAGEMENT CO LLC$4M
- Knights of Columbus Asset Advisors LLC$2M
- VANGUARD FIDUCIARY TRUST CO$2M
- Legato Capital Management LLC$1M
- LAZARD ASSET MANAGEMENT LLC$1M
Full exits 3
- VANGUARD GROUP INC$14M
- J. Goldman & Co LP$2M
- TWO SIGMA ADVISERS, LP$630K
Largest adds
- Mill Road Capital Management LLC$6M
- ROYCE & ASSOCIATES LP$5M
- DIMENSIONAL FUND ADVISORS LP$4M
- First Eagle Investment Management, LLC$3M
- IES Holdings, Inc.$3M
- WEBER CAPITAL MANAGEMENT LLC /ADV$3M
Largest trims
- MILLENNIUM MANAGEMENT LLC$1M
- Squarepoint Ops LLC$861K
- D. E. Shaw & Co., Inc.$800K
- RENAISSANCE TECHNOLOGIES LLC$769K
- Clearline Capital LP$651K
- BANK OF AMERICA CORP /DE/$602K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Mill Road Capital Management LLC added | 1,870,580 | $28M | 9.2% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 1,703,681 | $25M | 8.4% | 2026-Q1 |
| ROYCE & ASSOCIATES LP added | 1,533,052 | $23M | 7.6% | 2026-Q1 |
| WEBER CAPITAL MANAGEMENT LLC /ADV trimmed | 1,456,969 | $22M | 7.2% | 2026-Q1 |
| IES Holdings, Inc. added | 1,120,545 | $17M | 5.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 930,178 | $14M | 4.6% | 2026-Q1 |
| BlackRock, Inc. trimmed | 859,452 | $13M | 4.2% | 2026-Q1 |
| FEDERATED HERMES, INC. | 656,032 | $10M | 3.2% | 2026-Q1 |
| Clearline Capital LP trimmed | 554,089 | $8M | 2.7% | 2026-Q1 |
| Invenomic Capital Management LP trimmed | 452,614 | $7M | 2.2% | 2026-Q1 |
| DEUTSCHE BANK AG\ | 379,454 | $6M | 1.9% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 354,371 | $5M | 1.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 353,411 | $5M | 1.7% | 2026-Q1 |
| STATE STREET CORP trimmed | 312,164 | $5M | 1.5% | 2026-Q1 |
| Pacific Ridge Capital Partners, LLC added | 285,274 | $4M | 1.4% | 2026-Q1 |
| First Eagle Investment Management, LLC added | 281,532 | $4M | 1.4% | 2026-Q1 |
| ESSEX INVESTMENT MANAGEMENT CO LLC new | 268,567 | $4M | 1.3% | 2026-Q1 |
| CSM Advisors, LLC trimmed | 267,881 | $4M | 1.3% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 231,325 | $3M | 1.1% | 2026-Q1 |
| Empowered Funds, LLC added | 225,494 | $3M | 1.1% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 218,046 | $3M | 1.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 204,840 | $3M | 1.0% | 2026-Q1 |
| JB CAPITAL PARTNERS LP | 202,243 | $3M | 1.0% | 2026-Q1 |
| ALGERT GLOBAL LLC added | 179,290 | $3M | 0.9% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 159,751 | $2M | 0.8% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 158,335 | $2M | 0.8% | 2026-Q1 |
| Knights of Columbus Asset Advisors LLC new | 140,081 | $2M | 0.7% | 2026-Q1 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC trimmed | 135,168 | $2M | 0.7% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 131,376 | $2M | 0.6% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 126,234 | $2M | 0.6% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 120,500 | $2M | 0.6% | 2026-Q1 |
| Inspire Investing, LLC added | 115,815 | $2M | 0.6% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 114,477 | $2M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 112,277 | $2M | 0.6% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 107,375 | $2M | 0.5% | 2026-Q1 |
| RITHOLTZ WEALTH MANAGEMENT added | 104,752 | $2M | 0.5% | 2026-Q1 |
| MORGAN STANLEY trimmed | 104,271 | $2M | 0.5% | 2026-Q1 |
| Informed Momentum Co LLC | 96,263 | $1M | 0.5% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 86,031 | $1M | 0.4% | 2026-Q1 |
| Legato Capital Management LLC new | 83,945 | $1M | 0.4% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC added | 70,369 | $1M | 0.3% | 2026-Q1 |
| Raiffeisen Bank International AG | 65,000 | $949K | 0.3% | 2026-Q1 |
| Nuveen, LLC trimmed | 63,884 | $944K | 0.3% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 63,813 | $943K | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp added | 63,129 | $933K | 0.3% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 57,210 | $846K | 0.3% | 2026-Q1 |
| RBF Capital, LLC | 55,000 | $813K | 0.3% | 2026-Q1 |
| Manatuck Hill Partners, LLC new | 50,000 | $739K | 0.2% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 49,764 | $736K | 0.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 48,798 | $721K | 0.2% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP added | 48,765 | $721K | 0.2% | 2026-Q1 |
| Trexquant Investment LP added | 43,928 | $649K | 0.2% | 2026-Q1 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC added | 40,234 | $616K | 0.2% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 36,968 | $546K | 0.2% | 2026-Q1 |
| LSV ASSET MANAGEMENT trimmed | 35,801 | $529K | 0.2% | 2026-Q1 |
| Values First Advisors, Inc. added | 35,327 | $522K | 0.2% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC added | 34,926 | $516K | 0.2% | 2026-Q1 |
| Verdad Advisers, LP trimmed | 34,526 | $510K | 0.2% | 2026-Q1 |
| STRS OHIO trimmed | 31,700 | $469K | 0.2% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 31,140 | $460K | 0.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 30,304 | $448K | 0.1% | 2026-Q1 |
| HRT FINANCIAL LP added | 26,770 | $395K | 0.1% | 2026-Q1 |
| Hillsdale Investment Management Inc. | 26,600 | $393K | 0.1% | 2026-Q1 |
| Cambridge Investment Research Advisors, Inc. added | 26,221 | $388K | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC trimmed | 25,402 | $375K | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 23,097 | $341K | 0.1% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 21,009 | $311K | 0.1% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC | 20,979 | $310K | 0.1% | 2026-Q1 |
| EntryPoint Capital, LLC added | 20,426 | $302K | 0.1% | 2026-Q1 |
| OLD NATIONAL BANCORP /IN/ | 20,000 | $296K | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 18,780 | $278K | 0.1% | 2026-Q1 |
| Assenagon Asset Management S.A. trimmed | 17,971 | $266K | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP added | 17,568 | $260K | 0.1% | 2026-Q1 |
| UBS Group AG trimmed | 16,761 | $248K | 0.1% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 15,906 | $235K | 0.1% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 14,735 | $218K | 0.1% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | 13,018 | $192K | 0.1% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 12,104 | $179K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 10,899 | $161K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 10,324 | $153K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 11,880 | $150K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 1,109,588 | $14M | 4.7% | 2025-Q4 stale |
| Acuitas Investments, LLC added | 643,483 | $6M | 2.1% | 2025-Q3 stale |
| Foundry Partners, LLC trimmed | 376,658 | $4M | 1.3% | 2025-Q1 stale |
| J. Goldman & Co LP trimmed | 134,200 | $2M | 0.6% | 2025-Q4 stale |
| MARSHALL WACE, LLP trimmed | 62,720 | $664K | 0.2% | 2025-Q1 stale |
| TWO SIGMA ADVISERS, LP added | 49,824 | $630K | 0.2% | 2025-Q4 stale |
| XTX Topco Ltd added | 56,753 | $455K | 0.2% | 2025-Q2 stale |
| Cubist Systematic Strategies, LLC trimmed | 39,829 | $421K | 0.1% | 2025-Q1 stale |
| MARTINGALE ASSET MANAGEMENT L P trimmed | 30,065 | $380K | 0.1% | 2025-Q4 stale |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 23,619 | $299K | 0.1% | 2025-Q4 stale |
| Inspire Advisors, LLC trimmed | 29,926 | $294K | 0.1% | 2025-Q3 stale |
| ExodusPoint Capital Management, LP added | 29,828 | $294K | 0.1% | 2025-Q3 stale |
| Dynamic Technology Lab Private Ltd added | 35,253 | $282K | 0.1% | 2025-Q2 stale |
| NJ State Employees Deferred Compensation Plan | 24,000 | $236K | 0.1% | 2025-Q3 stale |
| Brevan Howard Capital Management LP new | 18,173 | $230K | 0.1% | 2025-Q4 stale |
| LAWSON KROEKER INVESTMENT MANAGEMENT INC/NE | 21,362 | $210K | 0.1% | 2025-Q3 stale |
| WOLVERINE TRADING, LLC added | 20,556 | $204K | 0.1% | 2025-Q3 stale |
| Heron Bay Capital Management trimmed | 14,564 | $184K | 0.1% | 2025-Q4 stale |
| BALYASNY ASSET MANAGEMENT L.P. new | 19,392 | $155K | 0.1% | 2025-Q2 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.