Who owns MAT (MAT)
Which tracked institutional funds hold MAT, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MAT 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
67 tracked funds added or opened MAT while 153 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
MAT’s largest tracked holder by dollar value, EdgePoint Investment Group Inc., sizes it at 5.7% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 5.7pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MAT 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 426 tracked filers holding MAT, 207 increased or opened the position and 229 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 MAT 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 30
- VANGUARD CAPITAL MANAGEMENT LLC$198M
- VANGUARD PORTFOLIO MANAGEMENT LLC$198M
- VANGUARD FIDUCIARY TRUST CO$28M
- Long Focus Capital Management, LLC$28M
- HBK INVESTMENTS L P$19M
- Interval Partners, LP$17M
Full exits 28
- VANGUARD GROUP INC$596M
- FRANKLIN RESOURCES INC$146M
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/$107M
- Patient Capital Management, LLC$55M
- Simcoe Capital Management, LLC$52M
- Ranmore Fund Management Ltd$44M
Largest adds
- MARSHALL WACE, LLP$54M
- SOUTHEASTERN ASSET MANAGEMENT INC/TN/$16M
- NORGES BANK$16M
- EDMOND DE ROTHSCHILD HOLDING S.A.$11M
- SEI INVESTMENTS CO$11M
- Gotham Asset Management, LLC$10M
Largest trims
- EdgePoint Investment Group Inc.$225M
- BlackRock, Inc.$164M
- PRIMECAP MANAGEMENT CO/CA/$160M
- FRONTIER CAPITAL MANAGEMENT CO LLC$59M
- MORGAN STANLEY$55M
- Point72 Asset Management, L.P.$54M
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 |
|---|---|---|---|---|
| EdgePoint Investment Group Inc. added | 49,140,882 | $714M | 13.0% | 2026-Q1 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 29,697,924 | $432M | 7.8% | 2026-Q1 |
| BlackRock, Inc. trimmed | 25,347,756 | $368M | 6.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 13,657,490 | $198M | 3.6% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 13,624,399 | $198M | 3.6% | 2026-Q1 |
| ARIEL INVESTMENTS, LLC added | 13,567,083 | $197M | 3.6% | 2026-Q1 |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/ added | 12,812,157 | $186M | 3.4% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 11,052,845 | $161M | 2.9% | 2026-Q1 |
| STATE STREET CORP added | 9,718,373 | $141M | 2.6% | 2026-Q1 |
| LSV ASSET MANAGEMENT added | 6,238,390 | $91M | 1.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 6,174,146 | $90M | 1.6% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 6,091,878 | $89M | 1.6% | 2026-Q1 |
| Alyeska Investment Group, L.P. added | 4,608,679 | $67M | 1.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 4,602,711 | $66M | 1.2% | 2026-Q1 |
| NORGES BANK added | 3,338,706 | $65M | 1.2% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 3,883,399 | $56M | 1.0% | 2026-Q1 |
| MARSHALL WACE, LLP added | 3,726,579 | $54M | 1.0% | 2026-Q1 |
| MORGAN STANLEY trimmed | 3,547,424 | $52M | 0.9% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 3,543,492 | $51M | 0.9% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 3,372,877 | $49M | 0.9% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 2,801,135 | $41M | 0.7% | 2026-Q1 |
| NORTHERN TRUST CORP added | 2,794,902 | $41M | 0.7% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 2,589,974 | $38M | 0.7% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 2,368,621 | $34M | 0.6% | 2026-Q1 |
| UBS Group AG added | 2,304,897 | $33M | 0.6% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 2,221,256 | $32M | 0.6% | 2026-Q1 |
| SEI INVESTMENTS CO added | 2,159,405 | $31M | 0.6% | 2026-Q1 |
| SERENITY CAPITAL MANAGEMENT PTE. LTD. trimmed | 2,002,032 | $29M | 0.5% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 1,946,260 | $28M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,921,414 | $28M | 0.5% | 2026-Q1 |
| Long Focus Capital Management, LLC new | 1,919,166 | $28M | 0.5% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,914,866 | $28M | 0.5% | 2026-Q1 |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 1,691,423 | $25M | 0.4% | 2026-Q1 |
| FULLER & THALER ASSET MANAGEMENT, INC. trimmed | 1,648,138 | $24M | 0.4% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 1,402,235 | $20M | 0.4% | 2026-Q1 |
| HBK INVESTMENTS L P new | 1,300,000 | $19M | 0.3% | 2026-Q1 |
| KING LUTHER CAPITAL MANAGEMENT CORP added | 1,238,336 | $18M | 0.3% | 2026-Q1 |
| Quantinno Capital Management LP trimmed | 1,222,491 | $18M | 0.3% | 2026-Q1 |
| Interval Partners, LP added | 1,193,062 | $17M | 0.3% | 2026-Q1 |
| Qube Research & Technologies Ltd trimmed | 1,159,230 | $17M | 0.3% | 2026-Q1 |
| EDMOND DE ROTHSCHILD HOLDING S.A. added | 960,000 | $14M | 0.3% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 805,163 | $12M | 0.2% | 2026-Q1 |
| Gotham Asset Management, LLC added | 802,437 | $12M | 0.2% | 2026-Q1 |
| CastleKnight Management LP added | 715,376 | $10M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 712,914 | $10M | 0.2% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 694,038 | $10M | 0.2% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 644,268 | $9M | 0.2% | 2026-Q1 |
| THOMPSON SIEGEL & WALMSLEY LLC added | 621,513 | $9M | 0.2% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 621,062 | $9M | 0.2% | 2026-Q1 |
| Swiss National Bank trimmed | 615,300 | $9M | 0.2% | 2026-Q1 |
| California Public Employees Retirement System trimmed | 593,247 | $9M | 0.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 590,470 | $9M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 587,995 | $9M | 0.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 574,188 | $8M | 0.2% | 2026-Q1 |
| Livforsakringsbolaget Skandia, Omsesidigt trimmed | 30,000 | $8M | 0.2% | 2026-Q1 |
| Galvin, Gaustad & Stein, LLC trimmed | 558,382 | $8M | 0.1% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC trimmed | 554,575 | $8M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 397,546 | $8M | 0.1% | 2026-Q1 |
| HANCOCK WHITNEY CORP trimmed | 521,936 | $8M | 0.1% | 2026-Q1 |
| Corient Private Wealth LLC added | 538,084 | $8M | 0.1% | 2026-Q1 |
| WINTON GROUP Ltd added | 509,872 | $7M | 0.1% | 2026-Q1 |
| CAPITAL FUND MANAGEMENT S.A. added | 505,750 | $7M | 0.1% | 2026-Q1 |
| JUPITER ASSET MANAGEMENT LTD added | 496,831 | $7M | 0.1% | 2026-Q1 |
| Pacer Advisors, Inc. added | 502,193 | $7M | 0.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 468,222 | $7M | 0.1% | 2026-Q1 |
| Man Group plc added | 445,006 | $6M | 0.1% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 433,951 | $6M | 0.1% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 429,259 | $6M | 0.1% | 2026-Q1 |
| Legal & General Group Plc trimmed | 410,448 | $6M | 0.1% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 407,750 | $6M | 0.1% | 2026-Q1 |
| Trexquant Investment LP added | 397,418 | $6M | 0.1% | 2026-Q1 |
| BARCLAYS PLC trimmed | 388,853 | $6M | 0.1% | 2026-Q1 |
| Retirement Systems of Alabama added | 381,025 | $6M | 0.1% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 379,147 | $6M | 0.1% | 2026-Q1 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC added | 376,227 | $5M | 0.1% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 374,109 | $5M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 373,051 | $5M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 30,017,669 | $596M | 10.8% | 2025-Q4 stale |
| FRANKLIN RESOURCES INC trimmed | 7,359,655 | $146M | 2.7% | 2025-Q4 stale |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 5,377,254 | $107M | 1.9% | 2025-Q4 stale |
| MANE GLOBAL CAPITAL MANAGEMENT LP added | 2,871,121 | $57M | 1.0% | 2025-Q2 stale |
| Patient Capital Management, LLC added | 2,794,343 | $55M | 1.0% | 2025-Q4 stale |
| Simcoe Capital Management, LLC added | 2,641,210 | $52M | 1.0% | 2025-Q4 stale |
| HENNESSY ADVISORS INC trimmed | 2,463,400 | $49M | 0.9% | 2025-Q2 stale |
| Ranmore Fund Management Ltd added | 2,200,000 | $44M | 0.8% | 2025-Q4 stale |
| Capital International Investors trimmed | 1,981,000 | $38M | 0.7% | 2025-Q1 stale |
| J. Goldman & Co LP added | 1,571,873 | $31M | 0.6% | 2025-Q4 stale |
| Freestone Grove Partners LP trimmed | 1,421,821 | $24M | 0.4% | 2025-Q3 stale |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,129,370 | $22M | 0.4% | 2025-Q2 stale |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) added | 973,829 | $19M | 0.4% | 2025-Q4 stale |
| Kodai Capital Management LP added | 723,624 | $14M | 0.3% | 2025-Q1 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 684,472 | $14M | 0.2% | 2025-Q4 stale |
| HS Management Partners, LLC trimmed | 683,200 | $14M | 0.2% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC added | 684,415 | $13M | 0.2% | 2025-Q1 stale |
| JANE STREET GROUP, LLC trimmed | 479,254 | $10M | 0.2% | 2025-Q4 stale |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 418,135 | $8M | 0.1% | 2025-Q2 stale |
| Corebridge Financial, Inc. trimmed | 372,130 | $7M | 0.1% | 2025-Q1 stale |
| ExodusPoint Capital Management, LP added | 309,044 | $6M | 0.1% | 2025-Q4 stale |
| Brandywine Global Investment Management, LLC added | 301,030 | $6M | 0.1% | 2025-Q4 stale |
| READYSTATE ASSET MANAGEMENT LP new | 279,444 | $6M | 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.