Who owns AMLX (AMLX)
Which tracked institutional funds hold AMLX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AMLX 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
59 tracked funds added or opened AMLX while 31 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
AMLX’s largest tracked holder by dollar value, FMR LLC, 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 AMLX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in AMLX 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 171 tracked filers holding AMLX, 89 increased or opened the position and 92 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 AMLX 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 9
- VANGUARD CAPITAL MANAGEMENT LLC$58M
- Jones Hill Capital LP$22M
- Siren, L.L.C.$17M
- VANGUARD PORTFOLIO MANAGEMENT LLC$13M
- VANGUARD FIDUCIARY TRUST CO$8M
- iA Global Asset Management Inc.$4M
Full exits 17
- VANGUARD GROUP INC$62M
- Sofinnova Investments, Inc.$6M
- SILVERARC CAPITAL MANAGEMENT, LLC$6M
- AMERIPRISE FINANCIAL INC$6M
- Patient Square Capital LP$4M
- TWO SIGMA ADVISERS, LP$4M
Largest adds
- FMR LLC$21M
- FRANKLIN RESOURCES INC$17M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$16M
- JANUS HENDERSON GROUP PLC$15M
- PERCEPTIVE ADVISORS LLC$15M
- BlackRock, Inc.$13M
Largest trims
- Nantahala Capital Management, LLC$3M
- Point72 Asset Management, L.P.$3M
- UBS Group AG$2M
- ACUTA CAPITAL PARTNERS, LLC$2M
- TWO SIGMA INVESTMENTS, LP$2M
- Alpha Wave Global, LP$2M
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 |
|---|---|---|---|---|
| FMR LLC trimmed | 15,862,576 | $220M | 12.7% | 2026-Q1 |
| BlackRock, Inc. trimmed | 8,828,836 | $123M | 7.1% | 2026-Q1 |
| PERCEPTIVE ADVISORS LLC | 8,284,882 | $115M | 6.6% | 2026-Q1 |
| TCG Crossover Management, LLC | 6,243,812 | $87M | 5.0% | 2026-Q1 |
| Commodore Capital LP | 5,650,000 | $79M | 4.5% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 4,986,073 | $69M | 4.0% | 2026-Q1 |
| Saturn V Capital Management LP trimmed | 4,349,885 | $60M | 3.5% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 4,141,575 | $58M | 3.3% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 3,560,764 | $49M | 2.9% | 2026-Q1 |
| First Light Asset Management, LLC trimmed | 3,190,645 | $44M | 2.6% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 2,987,147 | $42M | 2.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 2,625,991 | $37M | 2.1% | 2026-Q1 |
| STATE STREET CORP added | 2,363,161 | $33M | 1.9% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 2,261,569 | $31M | 1.8% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,210,932 | $31M | 1.8% | 2026-Q1 |
| MORGAN STANLEY trimmed | 2,175,547 | $30M | 1.7% | 2026-Q1 |
| Almitas Capital LLC | 2,122,597 | $30M | 1.7% | 2026-Q1 |
| GREAT POINT PARTNERS LLC | 1,750,000 | $24M | 1.4% | 2026-Q1 |
| Jones Hill Capital LP new | 1,598,794 | $22M | 1.3% | 2026-Q1 |
| 683 Capital Management, LLC trimmed | 1,530,000 | $21M | 1.2% | 2026-Q1 |
| EVENTIDE ASSET MANAGEMENT, LLC added | 1,513,958 | $21M | 1.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 1,330,689 | $18M | 1.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 1,267,785 | $18M | 1.0% | 2026-Q1 |
| Siren, L.L.C. new | 1,230,000 | $17M | 1.0% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,107,271 | $15M | 0.9% | 2026-Q1 |
| ADAR1 Capital Management, LLC added | 1,000,604 | $14M | 0.8% | 2026-Q1 |
| BARCLAYS PLC added | 971,854 | $14M | 0.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 944,781 | $13M | 0.8% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 903,192 | $13M | 0.7% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 868,325 | $12M | 0.7% | 2026-Q1 |
| Woodline Partners LP added | 845,800 | $12M | 0.7% | 2026-Q1 |
| Boxer Capital Management, LLC | 800,000 | $11M | 0.6% | 2026-Q1 |
| NORTHERN TRUST CORP trimmed | 779,908 | $11M | 0.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 716,225 | $10M | 0.6% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 702,236 | $10M | 0.6% | 2026-Q1 |
| Logos Global Management LP trimmed | 700,000 | $10M | 0.6% | 2026-Q1 |
| STEMPOINT CAPITAL LP added | 669,685 | $9M | 0.5% | 2026-Q1 |
| Parkman Healthcare Partners LLC added | 621,458 | $9M | 0.5% | 2026-Q1 |
| JUPITER ASSET MANAGEMENT LTD added | 592,654 | $8M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 586,152 | $8M | 0.5% | 2026-Q1 |
| Nantahala Capital Management, LLC trimmed | 535,684 | $7M | 0.4% | 2026-Q1 |
| Rock Springs Capital Management LP | 499,764 | $7M | 0.4% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 411,532 | $6M | 0.3% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 363,546 | $5M | 0.3% | 2026-Q1 |
| HighVista Strategies LLC added | 352,085 | $5M | 0.3% | 2026-Q1 |
| Cormorant Asset Management, LP trimmed | 350,000 | $5M | 0.3% | 2026-Q1 |
| UBS Group AG trimmed | 324,319 | $5M | 0.3% | 2026-Q1 |
| Tetragon Partners GP Ltd added | 317,877 | $4M | 0.3% | 2026-Q1 |
| iA Global Asset Management Inc. new | 304,786 | $4M | 0.2% | 2026-Q1 |
| Nuveen, LLC trimmed | 264,897 | $4M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp added | 251,104 | $3M | 0.2% | 2026-Q1 |
| SummitTX Capital, L.P. added | 227,010 | $3M | 0.2% | 2026-Q1 |
| Aldebaran Capital, LLC trimmed | 197,892 | $3M | 0.2% | 2026-Q1 |
| Invesco Ltd. trimmed | 171,620 | $2M | 0.1% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 161,945 | $2M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 157,089 | $2M | 0.1% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 156,128 | $2M | 0.1% | 2026-Q1 |
| ACUTA CAPITAL PARTNERS, LLC trimmed | 151,067 | $2M | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 159,663 | $2M | 0.1% | 2026-Q1 |
| PFM Health Sciences, LP added | 145,275 | $2M | 0.1% | 2026-Q1 |
| Alpha Wave Global, LP trimmed | 142,336 | $2M | 0.1% | 2026-Q1 |
| Swiss National Bank trimmed | 130,300 | $2M | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 121,439 | $2M | 0.1% | 2026-Q1 |
| Squarepoint Ops LLC added | 114,877 | $2M | 0.1% | 2026-Q1 |
| Elmind Capital, LP | 112,000 | $2M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 108,467 | $2M | 0.1% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 106,535 | $1M | 0.1% | 2026-Q1 |
| ALPS ADVISORS INC trimmed | 89,983 | $1M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 85,279 | $1M | 0.1% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC added | 77,794 | $1M | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 75,083 | $1M | 0.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 74,230 | $1M | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 72,061 | $1M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 5,106,289 | $62M | 3.6% | 2025-Q4 stale |
| Paradigm Biocapital Advisors LP new | 1,900,000 | $26M | 1.5% | 2025-Q3 stale |
| ORBIMED ADVISORS LLC added | 750,600 | $10M | 0.6% | 2025-Q3 stale |
| BRAIDWELL LP new | 612,841 | $8M | 0.5% | 2025-Q3 stale |
| JENNISON ASSOCIATES LLC new | 578,659 | $8M | 0.5% | 2025-Q3 stale |
| Sofinnova Investments, Inc. added | 527,099 | $6M | 0.4% | 2025-Q4 stale |
| SILVERARC CAPITAL MANAGEMENT, LLC trimmed | 506,242 | $6M | 0.4% | 2025-Q4 stale |
| AMERIPRISE FINANCIAL INC added | 502,366 | $6M | 0.3% | 2025-Q4 stale |
| Ally Bridge Group (NY) LLC added | 437,391 | $6M | 0.3% | 2025-Q3 stale |
| Aberdeen Group plc trimmed | 738,657 | $5M | 0.3% | 2025-Q2 stale |
| Patient Square Capital LP added | 350,000 | $4M | 0.2% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 328,401 | $4M | 0.2% | 2025-Q4 stale |
| JANE STREET GROUP, LLC added | 263,235 | $3M | 0.2% | 2025-Q4 stale |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 254,328 | $3M | 0.2% | 2025-Q4 stale |
| Longaeva Partners L.P. new | 200,000 | $3M | 0.2% | 2025-Q3 stale |
| Alyeska Investment Group, L.P. trimmed | 750,412 | $3M | 0.2% | 2025-Q1 stale |
| RENAISSANCE TECHNOLOGIES LLC added | 192,500 | $2M | 0.1% | 2025-Q4 stale |
| XTX Topco Ltd added | 189,673 | $2M | 0.1% | 2025-Q4 stale |
| FRED ALGER MANAGEMENT, LLC added | 164,042 | $2M | 0.1% | 2025-Q3 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 153,363 | $2M | 0.1% | 2025-Q4 stale |
| Atom Investors LP trimmed | 139,422 | $2M | 0.1% | 2025-Q4 stale |
| BANK OF MONTREAL /CAN/ trimmed | 138,525 | $2M | 0.1% | 2025-Q4 stale |
| J. Goldman & Co LP added | 258,600 | $2M | 0.1% | 2025-Q2 stale |
| Y-Intercept (Hong Kong) Ltd added | 240,379 | $2M | 0.1% | 2025-Q2 stale |
| DIADEMA PARTNERS LP new | 100,000 | $1M | 0.1% | 2025-Q3 stale |
| TANG CAPITAL MANAGEMENT LLC | 100,000 | $1M | 0.1% | 2025-Q3 stale |
| DARK FOREST CAPITAL MANAGEMENT LP trimmed | 86,795 | $1M | 0.1% | 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.