Who owns AMTM (AMTM)
Which tracked institutional funds hold AMTM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AMTM 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
70 tracked funds added or opened AMTM while 117 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
AMTM’s largest tracked holder by dollar value, AMERICAN SECURITIES LLC, sizes it at 29.9% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 29.8pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in AMTM 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 484 tracked filers holding AMTM, 220 increased or opened the position and 224 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 AMTM 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 29
- VANGUARD PORTFOLIO MANAGEMENT LLC$205M
- VANGUARD CAPITAL MANAGEMENT LLC$173M
- Permian Investment Partners, LP$41M
- TORONTO DOMINION BANK$41M
- Troluce Capital Advisors LLC$26M
- VANGUARD FIDUCIARY TRUST CO$25M
Full exits 23
- VANGUARD GROUP INC$441M
- ExodusPoint Capital Management, LP$34M
- COMERICA BANK$9M
- TWO SIGMA ADVISERS, LP$5M
- TWINBEECH CAPITAL LP$4M
- Blackstone Inc.$3M
Largest adds
- DIMENSIONAL FUND ADVISORS LP$46M
- UBS Group AG$39M
- BANK OF AMERICA CORP /DE/$29M
- SEGRA CAPITAL MANAGEMENT, LLC$25M
- Point72 Asset Management, L.P.$22M
- MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.$16M
Largest trims
- BlackRock, Inc.$177M
- M&T Bank Corp$145M
- AMERICAN SECURITIES LLC$131M
- Invesco Ltd.$83M
- FMR LLC$56M
- FRONTIER CAPITAL MANAGEMENT CO LLC$39M
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 |
|---|---|---|---|---|
| AMERICAN SECURITIES LLC | 45,026,743 | $1.2B | 20.8% | 2026-Q1 |
| Invesco Ltd. trimmed | 21,105,684 | $550M | 9.7% | 2026-Q1 |
| BlackRock, Inc. trimmed | 12,637,024 | $330M | 5.8% | 2026-Q1 |
| PRIMECAP MANAGEMENT CO/CA/ trimmed | 12,085,294 | $315M | 5.6% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 7,852,951 | $205M | 3.6% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 6,650,879 | $173M | 3.1% | 2026-Q1 |
| FMR LLC trimmed | 5,320,976 | $139M | 2.5% | 2026-Q1 |
| STATE STREET CORP added | 5,079,041 | $132M | 2.3% | 2026-Q1 |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 4,930,210 | $129M | 2.3% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 3,787,420 | $99M | 1.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,814,415 | $73M | 1.3% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 2,785,134 | $73M | 1.3% | 2026-Q1 |
| Focus Partners Wealth trimmed | 2,604,911 | $68M | 1.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 2,405,041 | $63M | 1.1% | 2026-Q1 |
| MORGAN STANLEY added | 2,234,913 | $58M | 1.0% | 2026-Q1 |
| Thrivent Financial for Lutherans added | 2,100,457 | $55M | 1.0% | 2026-Q1 |
| Arvin Capital Management LP added | 2,071,200 | $54M | 1.0% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 2,067,930 | $54M | 1.0% | 2026-Q1 |
| UBS Group AG added | 1,710,775 | $45M | 0.8% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 1,630,563 | $43M | 0.8% | 2026-Q1 |
| Ruane, Cunniff & Goldfarb L.P. trimmed | 1,622,982 | $42M | 0.7% | 2026-Q1 |
| SEGRA CAPITAL MANAGEMENT, LLC added | 1,612,726 | $42M | 0.7% | 2026-Q1 |
| Permian Investment Partners, LP new | 1,567,000 | $41M | 0.7% | 2026-Q1 |
| TORONTO DOMINION BANK added | 1,565,223 | $41M | 0.7% | 2026-Q1 |
| THOMPSON SIEGEL & WALMSLEY LLC trimmed | 1,525,884 | $40M | 0.7% | 2026-Q1 |
| BRIGHTLINE CAPITAL MANAGEMENT, LLC added | 1,396,000 | $36M | 0.6% | 2026-Q1 |
| Verition Fund Management LLC added | 1,297,946 | $34M | 0.6% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 1,199,491 | $31M | 0.6% | 2026-Q1 |
| NORGES BANK trimmed | 1,716,506 | $31M | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,131,438 | $30M | 0.5% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 1,081,336 | $28M | 0.5% | 2026-Q1 |
| Troluce Capital Advisors LLC new | 1,000,000 | $26M | 0.5% | 2026-Q1 |
| NORTHERN TRUST CORP added | 984,105 | $26M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 947,460 | $25M | 0.4% | 2026-Q1 |
| COOPER CREEK PARTNERS MANAGEMENT LLC trimmed | 929,334 | $24M | 0.4% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 908,599 | $24M | 0.4% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 900,177 | $23M | 0.4% | 2026-Q1 |
| CACTI ASSET MANAGEMENT LLC | 881,692 | $23M | 0.4% | 2026-Q1 |
| MOORE CAPITAL MANAGEMENT, LP added | 873,610 | $23M | 0.4% | 2026-Q1 |
| Nuveen, LLC added | 871,795 | $23M | 0.4% | 2026-Q1 |
| AVENIR CORP trimmed | 841,099 | $22M | 0.4% | 2026-Q1 |
| 683 Capital Management, LLC trimmed | 775,000 | $20M | 0.4% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC added | 744,728 | $19M | 0.3% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 713,828 | $19M | 0.3% | 2026-Q1 |
| Ancora Advisors LLC added | 703,119 | $18M | 0.3% | 2026-Q1 |
| Penn Capital Management Company, LLC trimmed | 694,352 | $18M | 0.3% | 2026-Q1 |
| FIL Ltd trimmed | 652,159 | $17M | 0.3% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 636,674 | $17M | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 631,055 | $16M | 0.3% | 2026-Q1 |
| Public Sector Pension Investment Board added | 549,797 | $14M | 0.3% | 2026-Q1 |
| ROYCE & ASSOCIATES LP added | 549,778 | $14M | 0.3% | 2026-Q1 |
| VAN ECK ASSOCIATES CORP added | 547,644 | $14M | 0.3% | 2026-Q1 |
| Gotham Asset Management, LLC trimmed | 521,041 | $14M | 0.2% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 502,487 | $13M | 0.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 495,669 | $13M | 0.2% | 2026-Q1 |
| CI INVESTMENTS INC. trimmed | 420,068 | $11M | 0.2% | 2026-Q1 |
| Vident Advisory, LLC added | 388,862 | $10M | 0.2% | 2026-Q1 |
| De Lisle Partners LLP new | 379,818 | $10M | 0.2% | 2026-Q1 |
| Legacy Advisors, LLC trimmed | 9,064,278 | $9M | 0.2% | 2026-Q1 |
| Aristotle Capital Boston, LLC trimmed | 344,976 | $9M | 0.2% | 2026-Q1 |
| Legal & General Group Plc trimmed | 334,896 | $9M | 0.2% | 2026-Q1 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC added | 333,800 | $9M | 0.2% | 2026-Q1 |
| Mawer Investment Management Ltd. new | 333,790 | $9M | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 330,049 | $9M | 0.2% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC trimmed | 329,745 | $9M | 0.2% | 2026-Q1 |
| Rovida Investment Management Ltd new | 315,000 | $8M | 0.1% | 2026-Q1 |
| Swiss National Bank added | 313,391 | $8M | 0.1% | 2026-Q1 |
| Hyperion Capital Advisors LP trimmed | 303,576 | $8M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 300,293 | $8M | 0.1% | 2026-Q1 |
| EXCHANGE TRADED CONCEPTS, LLC trimmed | 295,008 | $8M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 294,668 | $8M | 0.1% | 2026-Q1 |
| GRIZZLYROCK CAPITAL, LLC added | 289,113 | $8M | 0.1% | 2026-Q1 |
| California Public Employees Retirement System trimmed | 277,052 | $7M | 0.1% | 2026-Q1 |
| SG Americas Securities, LLC trimmed | 274,602 | $7M | 0.1% | 2026-Q1 |
| FIFTH THIRD BANCORP added | 273,316 | $7M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 247,957 | $6M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 245,824 | $6M | 0.1% | 2026-Q1 |
| FIRST NATIONAL BANK OF OMAHA added | 248,004 | $6M | 0.1% | 2026-Q1 |
| Soviero Asset Management, LP added | 240,000 | $6M | 0.1% | 2026-Q1 |
| AWH Capital, L.P. | 235,250 | $6M | 0.1% | 2026-Q1 |
| ROYAL BANK OF CANADA trimmed | 231,742 | $6M | 0.1% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 228,083 | $6M | 0.1% | 2026-Q1 |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC trimmed | 217,780 | $6M | 0.1% | 2026-Q1 |
| Hudson Value Partners, LLC added | 203,910 | $5M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 15,191,794 | $441M | 7.8% | 2025-Q4 stale |
| Kovitz Investment Group Partners, LLC added | 3,007,750 | $72M | 1.3% | 2025-Q3 stale |
| Freestone Grove Partners LP | 2,051,859 | $49M | 0.9% | 2025-Q3 stale |
| ExodusPoint Capital Management, LP added | 1,184,186 | $34M | 0.6% | 2025-Q4 stale |
| DISCOVERY CAPITAL MANAGEMENT, LLC / CT trimmed | 1,139,112 | $27M | 0.5% | 2025-Q3 stale |
| Kopernik Global Investors, LLC trimmed | 636,226 | $15M | 0.3% | 2025-Q2 stale |
| Engine Capital Management, LP | 635,255 | $15M | 0.3% | 2025-Q2 stale |
| Voss Capital, LP trimmed | 625,000 | $15M | 0.3% | 2025-Q3 stale |
| BW Gestao de Investimentos Ltda. trimmed | 511,477 | $12M | 0.2% | 2025-Q3 stale |
| Ghisallo Capital Management LLC new | 635,569 | $12M | 0.2% | 2025-Q1 stale |
| Loews Corp trimmed | 470,000 | $11M | 0.2% | 2025-Q2 stale |
| COMERICA BANK trimmed | 301,564 | $9M | 0.2% | 2025-Q4 stale |
| Monashee Investment Management LLC new | 360,000 | $7M | 0.1% | 2025-Q1 stale |
| Trexquant Investment LP new | 255,748 | $6M | 0.1% | 2025-Q3 stale |
| Arosa Capital Management LP trimmed | 252,500 | $6M | 0.1% | 2025-Q2 stale |
| Castalian Partners, LLC trimmed | 304,500 | $6M | 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.