Who owns ASM
Which tracked institutional funds hold ASM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ASM 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
28 tracked funds added or opened ASM while 21 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
ASM’s largest tracked holder by dollar value, Tidal Investments LLC, sizes it at 0.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ASM 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 135 tracked filers holding ASM, 90 increased or opened the position and 56 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 ASM 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 16
- Tidal Investments LLC$42M
- CITADEL ADVISORS LLC$6M
- Y-Intercept (Hong Kong) Ltd$4M
- Aquatic Capital Management LLC$4M
- SG Americas Securities, LLC$3M
- BANK OF MONTREAL /CAN/$3M
Full exits 7
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$9M
- Trek Financial, LLC$4M
- Perritt Capital Management Inc$2M
- Rothschild Wealth LLC$2M
- CAPTRUST FINANCIAL ADVISORS$2M
- VANGUARD GROUP INC$833K
Largest adds
- GEODE CAPITAL MANAGEMENT, LLC$7M
- TWO SIGMA INVESTMENTS, LP$5M
- TD Asset Management Inc$2M
- DIMENSIONAL FUND ADVISORS LP$2M
- MILLENNIUM MANAGEMENT LLC$2M
- Connor, Clark & Lunn Investment Management Ltd.$2M
Largest trims
- JANE STREET GROUP, LLC$4M
- BARD ASSOCIATES INC$3M
- Man Group plc$3M
- AMERICAN CENTURY COMPANIES INC$3M
- SPROTT INC.$1M
- DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main$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 |
|---|---|---|---|---|
| Tidal Investments LLC trimmed | 6,659,935 | $42M | 16.2% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 6,220,613 | $39M | 15.1% | 2026-Q1 |
| VAN ECK ASSOCIATES CORP trimmed | 5,014,108 | $32M | 12.2% | 2026-Q1 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main trimmed | 1,800,000 | $11M | 4.4% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 891,126 | $8M | 2.9% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 995,192 | $6M | 2.4% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 863,488 | $5M | 2.1% | 2026-Q1 |
| Man Group plc trimmed | 773,069 | $5M | 1.9% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 753,417 | $5M | 1.8% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. added | 668,611 | $4M | 1.6% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd new | 647,141 | $4M | 1.6% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 639,183 | $4M | 1.6% | 2026-Q1 |
| Aquatic Capital Management LLC new | 618,669 | $4M | 1.5% | 2026-Q1 |
| ALPS ADVISORS INC added | 609,207 | $4M | 1.5% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 560,814 | $4M | 1.4% | 2026-Q1 |
| SG Americas Securities, LLC new | 543,146 | $3M | 1.3% | 2026-Q1 |
| TD Asset Management Inc added | 525,671 | $3M | 1.3% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ added | 515,183 | $3M | 1.3% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 479,727 | $3M | 1.2% | 2026-Q1 |
| UBS Group AG trimmed | 399,815 | $3M | 1.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 372,173 | $2M | 0.9% | 2026-Q1 |
| Cedrus Wealth Group LLC trimmed | 340,769 | $2M | 0.8% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 314,900 | $2M | 0.8% | 2026-Q1 |
| MORGAN STANLEY added | 313,411 | $2M | 0.8% | 2026-Q1 |
| North Star Investment Management Corp. new | 300,000 | $2M | 0.7% | 2026-Q1 |
| Swiss National Bank added | 296,700 | $2M | 0.7% | 2026-Q1 |
| LPL Financial LLC added | 295,452 | $2M | 0.7% | 2026-Q1 |
| HRT FINANCIAL LP added | 278,920 | $2M | 0.7% | 2026-Q1 |
| Auxano Advisors, LLC trimmed | 220,020 | $1M | 0.5% | 2026-Q1 |
| Cambridge Investment Research Advisors, Inc. trimmed | 219,481 | $1M | 0.5% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 199,799 | $1M | 0.4% | 2026-Q1 |
| SPROTT INC. trimmed | 175,881 | $1M | 0.4% | 2026-Q1 |
| MACKENZIE FINANCIAL CORP added | 173,562 | $1M | 0.4% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 170,442 | $1M | 0.4% | 2026-Q1 |
| CIBC Asset Management Inc added | 150,805 | $954K | 0.4% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 146,715 | $931K | 0.4% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE new | 143,570 | $910K | 0.4% | 2026-Q1 |
| BRITISH COLUMBIA INVESTMENT MANAGEMENT Corp new | 136,403 | $865K | 0.3% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC new | 127,340 | $805K | 0.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 117,830 | $745K | 0.3% | 2026-Q1 |
| Nuveen, LLC | 109,287 | $691K | 0.3% | 2026-Q1 |
| Patriot Financial Group Insurance Agency, LLC added | 106,678 | $674K | 0.3% | 2026-Q1 |
| Legal & General Group Plc trimmed | 105,633 | $668K | 0.3% | 2026-Q1 |
| XTX Topco Ltd trimmed | 105,498 | $667K | 0.3% | 2026-Q1 |
| U S GLOBAL INVESTORS INC trimmed | 100,000 | $632K | 0.2% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 93,537 | $594K | 0.2% | 2026-Q1 |
| COMMONWEALTH EQUITY SERVICES, LLC added | 93,239 | $589K | 0.2% | 2026-Q1 |
| CenterBook Partners LP trimmed | 80,495 | $509K | 0.2% | 2026-Q1 |
| Qube Research & Technologies Ltd trimmed | 76,637 | $484K | 0.2% | 2026-Q1 |
| TORONTO DOMINION BANK added | 60,647 | $385K | 0.1% | 2026-Q1 |
| StoneX Group Inc. | 56,772 | $359K | 0.1% | 2026-Q1 |
| NATIONAL BANK OF CANADA /FI/ added | 56,296 | $357K | 0.1% | 2026-Q1 |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 53,982 | $342K | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC added | 52,629 | $333K | 0.1% | 2026-Q1 |
| Police & Firemen's Retirement System of New Jersey | 51,600 | $326K | 0.1% | 2026-Q1 |
| Private Advisor Group, LLC added | 45,252 | $286K | 0.1% | 2026-Q1 |
| TWO SIGMA SECURITIES, LLC trimmed | 44,269 | $280K | 0.1% | 2026-Q1 |
| Alberta Investment Management Corp new | 42,789 | $272K | 0.1% | 2026-Q1 |
| Quadrature Capital Ltd trimmed | 42,147 | $266K | 0.1% | 2026-Q1 |
| Vanguard Investments Australia, Ltd. new | 40,351 | $256K | 0.1% | 2026-Q1 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO added | 37,802 | $239K | 0.1% | 2026-Q1 |
| Caitong International Asset Management Co., Ltd added | 36,334 | $230K | 0.1% | 2026-Q1 |
| OSAIC HOLDINGS, INC. added | 32,376 | $205K | 0.1% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC new | 31,411 | $199K | 0.1% | 2026-Q1 |
| Pictet Asset Management Holding SA added | 31,028 | $196K | 0.1% | 2026-Q1 |
| Focus Partners Wealth added | 30,616 | $193K | 0.1% | 2026-Q1 |
| Scientech Research LLC new | 29,770 | $188K | 0.1% | 2026-Q1 |
| Janney Montgomery Scott LLC trimmed | 28,554 | $180K | 0.1% | 2026-Q1 |
| Mariner, LLC trimmed | 25,217 | $159K | 0.1% | 2026-Q1 |
| Themes Management Co LLC added | 22,952 | $146K | 0.1% | 2026-Q1 |
| Investment Management Corp of Ontario new | 22,700 | $143K | 0.1% | 2026-Q1 |
| Rathbones Group PLC | 21,100 | $134K | 0.1% | 2026-Q1 |
| State of Wyoming added | 20,428 | $127K | 0.0% | 2026-Q1 |
| Federation des caisses Desjardins du Quebec trimmed | 19,710 | $124K | 0.0% | 2026-Q1 |
| Corient Private Wealth LLC new | 18,200 | $115K | 0.0% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL new | 17,886 | $113K | 0.0% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 1,463,026 | $9M | 3.5% | 2025-Q4 stale |
| Trek Financial, LLC trimmed | 609,669 | $4M | 1.5% | 2025-Q4 stale |
| Rothschild Wealth LLC new | 350,000 | $2M | 0.8% | 2025-Q4 stale |
| Perritt Capital Management Inc trimmed | 350,000 | $2M | 0.8% | 2025-Q4 stale |
| CAPTRUST FINANCIAL ADVISORS trimmed | 242,467 | $2M | 0.6% | 2025-Q4 stale |
| Graham Capital Management, L.P. added | 179,454 | $942K | 0.4% | 2025-Q3 stale |
| AMERIPRISE FINANCIAL INC new | 237,400 | $855K | 0.3% | 2025-Q2 stale |
| VANGUARD GROUP INC new | 133,888 | $833K | 0.3% | 2025-Q4 stale |
| Virtu Financial LLC trimmed | 148,494 | $780K | 0.3% | 2025-Q3 stale |
| Spark Investment Management LLC trimmed | 137,000 | $718K | 0.3% | 2025-Q3 stale |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 183,300 | $657K | 0.3% | 2025-Q2 stale |
| OMERS ADMINISTRATION Corp added | 125,100 | $657K | 0.3% | 2025-Q3 stale |
| Quantbot Technologies LP added | 94,093 | $584K | 0.2% | 2025-Q4 stale |
| CreativeOne Wealth, LLC new | 82,496 | $433K | 0.2% | 2025-Q3 stale |
| PRUDENTIAL FINANCIAL INC | 77,600 | $407K | 0.2% | 2025-Q3 stale |
| OXFORD ASSET MANAGEMENT LLP new | 44,432 | $276K | 0.1% | 2025-Q4 stale |
| Brevan Howard Capital Management LP new | 33,495 | $208K | 0.1% | 2025-Q4 stale |
| Versor Investments LP new | 32,400 | $202K | 0.1% | 2025-Q4 stale |
| PRELUDE CAPITAL MANAGEMENT, LLC new | 29,938 | $186K | 0.1% | 2025-Q4 stale |
| Olympiad Research LP new | 25,536 | $159K | 0.1% | 2025-Q4 stale |
| Marex Group plc trimmed | 28,106 | $149K | 0.1% | 2025-Q3 stale |
| Cubist Systematic Strategies, LLC new | 72,575 | $134K | 0.1% | 2025-Q1 stale |
| RAYMOND JAMES FINANCIAL INC added | 20,192 | $125K | 0.0% | 2025-Q4 stale |
| Calamos Advisors LLC new | 21,055 | $111K | 0.0% | 2025-Q3 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.