Who owns MPAA (MPAA)
Which tracked institutional funds hold MPAA, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MPAA company fundamentals →
Ownership as of the 2026-Q1 13F filings. 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
10 tracked funds added or opened MPAA while 23 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
MPAA’s largest tracked holder by dollar value, Private Capital Management, LLC, sizes it at 2.6% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 2.6pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MPAA 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 110 tracked filers holding MPAA, 61 increased or opened the position and 62 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 MPAA 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 6
- VANGUARD CAPITAL MANAGEMENT LLC$9M
- KENNEDY CAPITAL MANAGEMENT LLC$2M
- Mink Brook Asset Management LLC$2M
- VANGUARD FIDUCIARY TRUST CO$1M
- VANGUARD PORTFOLIO MANAGEMENT LLC$856K
- Manatuck Hill Partners, LLC$830K
Full exits 3
- VANGUARD GROUP INC$12M
- AXXCESS WEALTH MANAGEMENT, LLC$1M
- RENAISSANCE TECHNOLOGIES LLC$747K
Largest adds
- Azarias Capital Management, L.P.$3M
- DONALD SMITH & CO., INC.$2M
- CITADEL ADVISORS LLC$532K
- JPMORGAN CHASE & CO$258K
Largest trims
- 325 CAPITAL LLC$3M
- Private Capital Management, LLC$2M
- ACADIAN ASSET MANAGEMENT LLC$2M
- BlackRock, Inc.$1M
- AMERIPRISE FINANCIAL INC$1M
- O'SHAUGHNESSY ASSET MANAGEMENT, LLC$1M
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 |
|---|---|---|---|---|
| Private Capital Management, LLC added | 2,299,693 | $25M | 11.6% | 2026-Q1 |
| 325 CAPITAL LLC | 2,018,795 | $22M | 10.1% | 2026-Q1 |
| DONALD SMITH & CO., INC. added | 1,260,044 | $14M | 6.3% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 1,133,796 | $13M | 5.7% | 2026-Q1 |
| BlackRock, Inc. trimmed | 986,765 | $11M | 5.0% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 783,750 | $9M | 3.9% | 2026-Q1 |
| Pacific Ridge Capital Partners, LLC added | 772,421 | $9M | 3.9% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 635,043 | $7M | 3.2% | 2026-Q1 |
| Azarias Capital Management, L.P. added | 532,869 | $6M | 2.7% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 528,657 | $6M | 2.6% | 2026-Q1 |
| MORGAN STANLEY added | 455,663 | $5M | 2.3% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 394,449 | $4M | 2.0% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 307,503 | $3M | 1.5% | 2026-Q1 |
| RBF Capital, LLC trimmed | 298,252 | $3M | 1.5% | 2026-Q1 |
| STATE STREET CORP trimmed | 264,133 | $3M | 1.3% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 221,253 | $2M | 1.1% | 2026-Q1 |
| KENNEDY CAPITAL MANAGEMENT LLC trimmed | 206,401 | $2M | 1.0% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 201,074 | $2M | 1.0% | 2026-Q1 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC trimmed | 181,600 | $2M | 0.9% | 2026-Q1 |
| ALGERT GLOBAL LLC added | 144,884 | $2M | 0.7% | 2026-Q1 |
| Mink Brook Asset Management LLC new | 143,543 | $2M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP added | 121,755 | $1M | 0.6% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 117,878 | $1M | 0.6% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 116,653 | $1M | 0.6% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 114,730 | $1M | 0.6% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 105,288 | $1M | 0.5% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 95,783 | $1M | 0.5% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 94,579 | $1M | 0.5% | 2026-Q1 |
| Atlas Legacy Advisors, LLC | 93,443 | $1M | 0.5% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 85,000 | $940K | 0.4% | 2026-Q1 |
| CAPTRUST FINANCIAL ADVISORS trimmed | 80,681 | $892K | 0.4% | 2026-Q1 |
| Empowered Funds, LLC added | 80,600 | $891K | 0.4% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 77,358 | $856K | 0.4% | 2026-Q1 |
| Manatuck Hill Partners, LLC added | 75,000 | $830K | 0.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 72,940 | $807K | 0.4% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 72,839 | $805K | 0.4% | 2026-Q1 |
| MARTINGALE ASSET MANAGEMENT L P added | 66,711 | $738K | 0.3% | 2026-Q1 |
| SummerHaven Investment Management, LLC trimmed | 61,021 | $675K | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 60,720 | $672K | 0.3% | 2026-Q1 |
| EQUITABLE TRUST CO added | 58,492 | $647K | 0.3% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC added | 47,278 | $523K | 0.2% | 2026-Q1 |
| RITHOLTZ WEALTH MANAGEMENT trimmed | 46,855 | $518K | 0.2% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 44,544 | $493K | 0.2% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC trimmed | 43,912 | $486K | 0.2% | 2026-Q1 |
| STRS OHIO | 43,700 | $483K | 0.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 42,223 | $467K | 0.2% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 39,089 | $432K | 0.2% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC added | 38,523 | $426K | 0.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 30,049 | $332K | 0.2% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 29,224 | $323K | 0.1% | 2026-Q1 |
| Invesco Ltd. trimmed | 28,226 | $312K | 0.1% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 28,189 | $312K | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 28,112 | $311K | 0.1% | 2026-Q1 |
| XTX Topco Ltd added | 27,796 | $307K | 0.1% | 2026-Q1 |
| Hillsdale Investment Management Inc. | 27,600 | $305K | 0.1% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 27,195 | $301K | 0.1% | 2026-Q1 |
| BAILARD, INC. added | 27,000 | $299K | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC added | 25,843 | $286K | 0.1% | 2026-Q1 |
| OSAIC HOLDINGS, INC. trimmed | 20,890 | $231K | 0.1% | 2026-Q1 |
| UBS Group AG trimmed | 20,787 | $230K | 0.1% | 2026-Q1 |
| EVERGREEN CAPITAL MANAGEMENT LLC | 20,000 | $221K | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 18,247 | $202K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 18,100 | $200K | 0.1% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 17,835 | $197K | 0.1% | 2026-Q1 |
| Nuveen, LLC | 17,089 | $189K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 975,858 | $12M | 5.5% | 2025-Q4 stale |
| Tieton Capital Management, LLC trimmed | 670,697 | $6M | 2.9% | 2025-Q1 stale |
| Pure Financial Advisors, LLC new | 516,129 | $6M | 2.6% | 2025-Q2 stale |
| SEGALL BRYANT & HAMILL, LLC added | 140,629 | $2M | 1.1% | 2025-Q3 stale |
| Truffle Hound Capital, LLC new | 150,000 | $1M | 0.6% | 2025-Q1 stale |
| Informed Momentum Co LLC trimmed | 77,009 | $1M | 0.6% | 2025-Q3 stale |
| Perritt Capital Management Inc trimmed | 73,032 | $1M | 0.5% | 2025-Q3 stale |
| AXXCESS WEALTH MANAGEMENT, LLC new | 93,443 | $1M | 0.5% | 2025-Q4 stale |
| SCALAR GAUGE MANAGEMENT, LLC new | 53,000 | $877K | 0.4% | 2025-Q3 stale |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 60,500 | $747K | 0.3% | 2025-Q4 stale |
| Trexquant Investment LP added | 43,740 | $723K | 0.3% | 2025-Q3 stale |
| MILLENNIUM MANAGEMENT LLC trimmed | 38,432 | $474K | 0.2% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP trimmed | 38,400 | $474K | 0.2% | 2025-Q4 stale |
| OMERS ADMINISTRATION Corp added | 41,900 | $398K | 0.2% | 2025-Q1 stale |
| GSA CAPITAL PARTNERS LLP trimmed | 24,068 | $398K | 0.2% | 2025-Q3 stale |
| Cubist Systematic Strategies, LLC trimmed | 23,744 | $393K | 0.2% | 2025-Q3 stale |
| Jump Financial, LLC trimmed | 23,007 | $381K | 0.2% | 2025-Q3 stale |
| Integrated Quantitative Investments LLC new | 21,902 | $362K | 0.2% | 2025-Q3 stale |
| Verition Fund Management LLC trimmed | 29,660 | $332K | 0.2% | 2025-Q2 stale |
| Sequoia Financial Advisors, LLC | 26,190 | $323K | 0.1% | 2025-Q4 stale |
| Catalyst Funds Management Pty Ltd added | 24,745 | $305K | 0.1% | 2025-Q4 stale |
| Corton Capital Inc. added | 17,879 | $296K | 0.1% | 2025-Q3 stale |
| WINTON GROUP Ltd trimmed | 22,695 | $280K | 0.1% | 2025-Q4 stale |
| OCCUDO QUANTITATIVE STRATEGIES LP new | 16,694 | $276K | 0.1% | 2025-Q3 stale |
| Petrus Trust Company, LTA added | 24,137 | $270K | 0.1% | 2025-Q2 stale |
| Dynamic Technology Lab Private Ltd trimmed | 23,694 | $265K | 0.1% | 2025-Q2 stale |
| HRT FINANCIAL LP added | 21,347 | $263K | 0.1% | 2025-Q4 stale |
| Centiva Capital, LP new | 15,642 | $259K | 0.1% | 2025-Q3 stale |
| Ancora Advisors LLC trimmed | 22,705 | $254K | 0.1% | 2025-Q2 stale |
| PharVision Advisers, LLC trimmed | 20,032 | $247K | 0.1% | 2025-Q4 stale |
| Man Group plc trimmed | 17,246 | $213K | 0.1% | 2025-Q4 stale |
| Jain Global LLC new | 21,738 | $207K | 0.1% | 2025-Q1 stale |
| Qube Research & Technologies Ltd trimmed | 16,375 | $202K | 0.1% | 2025-Q4 stale |
| Rothschild Wealth LLC new | 16,032 | $198K | 0.1% | 2025-Q4 stale |
| BALYASNY ASSET MANAGEMENT L.P. added | 20,784 | $197K | 0.1% | 2025-Q1 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.