Who owns ACM
Which tracked institutional funds hold ACM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ACM company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
98 tracked funds added or opened ACM while 260 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
ACM’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes ACM more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ACM 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 2026-Q1 and 2026-Q2, across 533 tracked filers holding ACM, 247 increased or opened the position and 387 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 ACM between the 2026-Q1 and 2026-Q2 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 33
- Perpetual Ltd$34M
- LETKO, BROSSEAU & ASSOCIATES INC$27M
- ING GROEP NV$19M
- PDT Partners, LLC$12M
- Running Oak Capital LLC$9M
- Epoch Investment Partners, Inc.$8M
Full exits 77
- Amundi$104M
- LORD, ABBETT & CO. LLC$85M
- DekaBank Deutsche Girozentrale$62M
- SG Americas Securities, LLC$25M
- Vinva Investment Management Ltd$24M
- Sumitomo Mitsui Trust Group, Inc.$23M
Largest adds
- BARROW HANLEY MEWHINNEY & STRAUSS LLC$142M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$126M
- Qube Research & Technologies Ltd$110M
- FMR LLC$89M
- CIBC Bancorp USA Inc.$64M
- BlackRock, Inc.$47M
Largest trims
- Pictet Asset Management Holding SA$170M
- STATE STREET CORP$141M
- PRIMECAP MANAGEMENT CO/CA/$120M
- NORTHERN TRUST CORP$88M
- VANGUARD CAPITAL MANAGEMENT LLC$87M
- FIRST TRUST ADVISORS LP$86M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 14,379,638 | $1.0B | 13.3% | 2026-Q2 |
| PRIMECAP MANAGEMENT CO/CA/ added | 8,787,043 | $613M | 8.1% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 5,808,042 | $405M | 5.4% | 2026-Q2 |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC added | 5,497,153 | $384M | 5.1% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 5,486,637 | $383M | 5.1% | 2026-Q2 |
| STATE STREET CORP trimmed | 4,106,098 | $287M | 3.8% | 2026-Q2 |
| FMR LLC added | 3,758,192 | $262M | 3.5% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 3,565,323 | $249M | 3.3% | 2026-Q2 |
| Invesco Ltd. trimmed | 3,191,873 | $223M | 2.9% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 2,446,092 | $171M | 2.3% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 2,445,738 | $171M | 2.3% | 2026-Q2 |
| Impax Asset Management Group plc added | 2,128,339 | $149M | 2.0% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 2,119,499 | $148M | 2.0% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 2,096,935 | $146M | 1.9% | 2026-Q2 |
| NORGES BANK added | 1,853,035 | $129M | 1.7% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 1,795,383 | $124M | 1.6% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 1,711,157 | $119M | 1.6% | 2026-Q2 |
| UBS Group AG added | 1,695,404 | $118M | 1.6% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,640,760 | $115M | 1.5% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,638,429 | $114M | 1.5% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 1,352,854 | $94M | 1.3% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 1,321,296 | $92M | 1.2% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 1,139,237 | $80M | 1.1% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 1,125,934 | $79M | 1.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 1,050,704 | $73M | 1.0% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 968,695 | $68M | 0.9% | 2026-Q2 |
| CIBC Bancorp USA Inc. added | 925,183 | $65M | 0.9% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 875,607 | $61M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 812,607 | $57M | 0.8% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 770,270 | $54M | 0.7% | 2026-Q2 |
| Ninety One UK Ltd trimmed | 752,341 | $53M | 0.7% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 746,877 | $52M | 0.7% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 742,285 | $52M | 0.7% | 2026-Q2 |
| BARCLAYS PLC added | 728,214 | $51M | 0.7% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 677,771 | $47M | 0.6% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL added | 669,882 | $47M | 0.6% | 2026-Q2 |
| PFA Pension, Forsikringsaktieselskab trimmed | 618,067 | $43M | 0.6% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 567,740 | $39M | 0.5% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 556,862 | $47M | 0.6% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 534,601 | $37M | 0.5% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 512,703 | $36M | 0.5% | 2026-Q2 |
| Squarepoint Ops LLC added | 497,601 | $35M | 0.5% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 488,288 | $34M | 0.5% | 2026-Q2 |
| Perpetual Ltd new | 484,722 | $34M | 0.4% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 475,081 | $33M | 0.4% | 2026-Q2 |
| Gotham Asset Management, LLC added | 454,550 | $32M | 0.4% | 2026-Q2 |
| Nuveen, LLC trimmed | 443,361 | $31M | 0.4% | 2026-Q2 |
| Sandhill Capital Partners LLC trimmed | 414,675 | $29M | 0.4% | 2026-Q2 |
| LETKO, BROSSEAU & ASSOCIATES INC new | 390,075 | $27M | 0.4% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 363,000 | $25M | 0.3% | 2026-Q2 |
| WORLDQUANT MILLENNIUM ADVISORS LLC added | 352,968 | $25M | 0.3% | 2026-Q2 |
| Verition Fund Management LLC added | 349,533 | $24M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 346,707 | $24M | 0.3% | 2026-Q2 |
| Robeco Schweiz AG trimmed | 345,638 | $24M | 0.3% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 338,081 | $24M | 0.3% | 2026-Q2 |
| Allianz Asset Management GmbH trimmed | 337,242 | $29M | 0.4% | 2026-Q2 |
| BANK OF NOVA SCOTIA added | 325,300 | $23M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 325,257 | $23M | 0.3% | 2026-Q2 |
| Retirement Systems of Alabama trimmed | 313,737 | $22M | 0.3% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 306,336 | $21M | 0.3% | 2026-Q2 |
| Robeco Institutional Asset Management B.V. added | 303,028 | $21M | 0.3% | 2026-Q2 |
| FIL Ltd trimmed | 301,603 | $21M | 0.3% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 291,804 | $20M | 0.3% | 2026-Q2 |
| FLPUTNAM INVESTMENT MANAGEMENT CO trimmed | 287,110 | $20M | 0.3% | 2026-Q2 |
| HENNESSY ADVISORS INC | 285,700 | $20M | 0.3% | 2026-Q2 |
| ING GROEP NV added | 275,200 | $19M | 0.3% | 2026-Q2 |
| JUPITER ASSET MANAGEMENT LTD added | 267,028 | $19M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System added | 265,694 | $19M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 259,680 | $18M | 0.2% | 2026-Q2 |
| Trexquant Investment LP added | 239,325 | $17M | 0.2% | 2026-Q2 |
| TD Asset Management Inc added | 200,030 | $14M | 0.2% | 2026-Q2 |
| Legal & General Group Plc trimmed | 191,978 | $13M | 0.2% | 2026-Q2 |
| Vest Financial, LLC trimmed | 191,583 | $13M | 0.2% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC trimmed | 191,174 | $13M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO added | 190,053 | $13M | 0.2% | 2026-Q2 |
| PDT Partners, LLC added | 172,729 | $12M | 0.2% | 2026-Q2 |
| Swiss Life Asset Management Ltd trimmed | 170,021 | $12M | 0.2% | 2026-Q2 |
| Bridgewater Associates, LP trimmed | 163,405 | $11M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 159,018 | $11M | 0.1% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 152,298 | $11M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 149,714 | $10M | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 146,128 | $10M | 0.1% | 2026-Q2 |
| Delaney Capital Management Ltd. added | 141,526 | $10M | 0.1% | 2026-Q2 |
| MIROVA added | 140,048 | $10M | 0.1% | 2026-Q2 |
| Boston Partners added | 138,428 | $10M | 0.1% | 2026-Q2 |
| Running Oak Capital LLC new | 133,732 | $9M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 133,299 | $9M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 132,846 | $9M | 0.1% | 2026-Q2 |
| FORA Capital, LLC added | 131,911 | $9M | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP added | 129,355 | $9M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP trimmed | 119,610 | $8M | 0.1% | 2026-Q2 |
| Guinness Asset Management LTD trimmed | 119,464 | $8M | 0.1% | 2026-Q2 |
| Epoch Investment Partners, Inc. new | 118,420 | $8M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN trimmed | 116,740 | $8M | 0.1% | 2026-Q2 |
| Stanley Capital Management, LLC | 116,400 | $8M | 0.1% | 2026-Q2 |
| OCCUDO QUANTITATIVE STRATEGIES LP added | 116,351 | $8M | 0.1% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM trimmed | 112,799 | $8M | 0.1% | 2026-Q2 |
| Vontobel Holding Ltd. added | 109,629 | $8M | 0.1% | 2026-Q2 |
| Holocene Advisors, LP added | 107,951 | $8M | 0.1% | 2026-Q2 |
| Knights of Columbus Asset Advisors LLC added | 107,355 | $7M | 0.1% | 2026-Q2 |
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.