Who owns Amarin Corporation (AMRN)
Which tracked institutional funds hold AMRN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See AMRN 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
7 tracked funds added or opened AMRN while 4 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
AMRN’s largest tracked holder by dollar value, Sarissa Capital Management LP, sizes it at 15.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 15.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in AMRN 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 78 tracked filers holding AMRN, 36 increased or opened the position and 22 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 AMRN 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 2
- JANE STREET GROUP, LLC$600K
- George Kaiser Family Foundation$593K
Full exits 2
- ACADIAN ASSET MANAGEMENT LLC$9M
- Point72 Asset Management, L.P.$3M
Largest adds
- Brooklands Fund Management Ltd$3M
- Sarissa Capital Management LP$2M
- Kynam Capital Management, LP$2M
- RENAISSANCE TECHNOLOGIES LLC$493K
- CITADEL ADVISORS LLC$355K
Largest trims
- MILLENNIUM MANAGEMENT LLC$2M
- MORGAN STANLEY$675K
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 |
|---|---|---|---|---|
| Sarissa Capital Management LP | 1,673,395 | $27M | 33.8% | 2026-Q2 |
| Kynam Capital Management, LP added | 532,982 | $8M | 10.8% | 2026-Q2 |
| MORGAN STANLEY trimmed | 223,617 | $4M | 4.5% | 2026-Q2 |
| Waterfront Wealth Inc. added | 213,949 | $3M | 4.0% | 2026-Q2 |
| Brooklands Fund Management Ltd added | 177,325 | $3M | 3.5% | 2026-Q2 |
| Eversept Partners, LP trimmed | 145,296 | $2M | 2.9% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 115,808 | $2M | 2.3% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 100,511 | $2M | 2.0% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 95,364 | $2M | 1.9% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 71,813 | $1M | 1.5% | 2026-Q2 |
| LCM Capital Management Inc added | 51,362 | $819K | 1.0% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 48,369 | $771K | 1.0% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 37,628 | $600K | 0.8% | 2026-Q2 |
| George Kaiser Family Foundation trimmed | 37,207 | $593K | 0.8% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 29,211 | $466K | 0.6% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 29,001 | $462K | 0.6% | 2026-Q2 |
| STATE STREET CORP added | 25,016 | $399K | 0.5% | 2026-Q2 |
| Bleakley Financial Group, LLC trimmed | 23,505 | $375K | 0.5% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 18,982 | $303K | 0.4% | 2026-Q2 |
| State of New Jersey Common Pension Fund D | 18,879 | $301K | 0.4% | 2026-Q2 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 18,370 | $293K | 0.4% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 18,165 | $290K | 0.4% | 2026-Q2 |
| R Squared Ltd trimmed | 16,938 | $270K | 0.3% | 2026-Q2 |
| State of Tennessee, Department of Treasury | 15,004 | $239K | 0.3% | 2026-Q2 |
| Quadrature Capital Ltd trimmed | 14,842 | $237K | 0.3% | 2026-Q2 |
| Quinn Opportunity Partners LLC | 14,305 | $228K | 0.3% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 13,913 | $222K | 0.3% | 2026-Q2 |
| EntryPoint Capital, LLC trimmed | 12,226 | $195K | 0.2% | 2026-Q2 |
| Jump Financial, LLC trimmed | 12,008 | $191K | 0.2% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC | 11,771 | $188K | 0.2% | 2026-Q2 |
| OSAIC HOLDINGS, INC. added | 11,565 | $184K | 0.2% | 2026-Q2 |
| Verdad Advisers, LP new | 10,431 | $166K | 0.2% | 2026-Q2 |
| UBS Group AG trimmed | 10,063 | $160K | 0.2% | 2026-Q2 |
| Steward Partners Investment Advisory, LLC trimmed | 8,910 | $142K | 0.2% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND | 7,605 | $121K | 0.2% | 2026-Q2 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO added | 5,774 | $92K | 0.1% | 2026-Q2 |
| Federation des caisses Desjardins du Quebec | 4,615 | $74K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 3,733 | $59K | 0.1% | 2026-Q2 |
| NATIONAL BANK OF CANADA /FI/ | 2,518 | $40K | 0.1% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 1,877 | $30K | 0.0% | 2026-Q2 |
| GAMMA Investing LLC added | 1,576 | $25K | 0.0% | 2026-Q2 |
| NewEdge Advisors, LLC trimmed | 1,347 | $21K | 0.0% | 2026-Q2 |
| Farther Finance Advisors, LLC trimmed | 958 | $15K | 0.0% | 2026-Q2 |
| IFP Advisors, Inc | 814 | $13K | 0.0% | 2026-Q2 |
| Beaird Harris Wealth Management, LLC | 750 | $12K | 0.0% | 2026-Q2 |
| CoreCap Advisors, LLC | 535 | $9K | 0.0% | 2026-Q2 |
| Integrated Wealth Concepts LLC trimmed | 530 | $8K | 0.0% | 2026-Q2 |
| JONES FINANCIAL COMPANIES LLLP added | 493 | $8K | 0.0% | 2026-Q2 |
| BARCLAYS PLC trimmed | 305 | $5K | 0.0% | 2026-Q2 |
| JPMORGAN CHASE & CO | 242 | $4K | 0.0% | 2026-Q2 |
| Westside Investment Management, Inc. | 205 | $3K | 0.0% | 2026-Q2 |
| Global Retirement Partners, LLC | 166 | $3K | 0.0% | 2026-Q2 |
| GROUP ONE TRADING LLC added | 130 | $2K | 0.0% | 2026-Q2 |
| HARBOUR INVESTMENTS, INC. | 98 | $2K | 0.0% | 2026-Q2 |
| HighMark Wealth Management LLC | 50 | $797 | 0.0% | 2026-Q2 |
| Activest Wealth Management | 50 | $797 | 0.0% | 2026-Q2 |
| Arax Advisory Partners new | 43 | $685 | 0.0% | 2026-Q2 |
| Darwin Wealth Management, LLC new | 25 | $398 | 0.0% | 2026-Q2 |
| Continuum Advisory, LLC trimmed | 19 | $303 | 0.0% | 2026-Q2 |
| Caitong International Asset Management Co., Ltd trimmed | 17 | $271 | 0.0% | 2026-Q2 |
| Atlantic Union Bankshares Corp | 12 | $192 | 0.0% | 2026-Q2 |
| Truvestments Capital LLC | 12 | $191 | 0.0% | 2026-Q2 |
| Parallel Advisors, LLC | 10 | $159 | 0.0% | 2026-Q2 |
| Creative Capital Management Investments LLC | 9 | $143 | 0.0% | 2026-Q2 |
| Key Financial Inc | 8 | $128 | 0.0% | 2026-Q2 |
| CITIGROUP INC trimmed | 8 | $128 | 0.0% | 2026-Q2 |
| MCGUIRE CAPITAL ADVISORS INC | 7 | $112 | 0.0% | 2026-Q2 |
| EASTERN BANK | 7 | $112 | 0.0% | 2026-Q2 |
| Winch Advisory Services, LLC | 7 | $112 | 0.0% | 2026-Q2 |
| Crewe Advisors LLC | 5 | $80 | 0.0% | 2026-Q2 |
| Allworth Financial LP | 5 | $80 | 0.0% | 2026-Q2 |
| Oakmont Advisory Group, LLC new | 5 | $80 | 0.0% | 2026-Q2 |
| BFSG, LLC new | 5 | $80 | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. | 5 | $80 | 0.0% | 2026-Q2 |
| WHITTIER TRUST CO new | 4 | $63 | 0.0% | 2026-Q2 |
| Caitlin John, LLC | 2 | $32 | 0.0% | 2026-Q2 |
| JFS WEALTH ADVISORS, LLC | 1 | $16 | 0.0% | 2026-Q2 |
| WHITTIER TRUST CO OF NEVADA INC new | 1 | $15 | 0.0% | 2026-Q2 |
| ACADIAN ASSET MANAGEMENT LLC added | 636,769 | $9M | 11.6% | 2026-Q1 stale (1 quarter behind) |
| Point72 Asset Management, L.P. added | 240,761 | $3M | 4.4% | 2026-Q1 stale (1 quarter behind) |
| Hayek Kallen Investment Management trimmed | 12,809 | $185K | 0.2% | 2026-Q1 stale (1 quarter behind) |
| GOLDMAN SACHS GROUP INC trimmed | 11,918 | $172K | 0.2% | 2026-Q1 stale (1 quarter behind) |
| EverSource Wealth Advisors, LLC new | 234 | $44K | 0.1% | 2026-Q1 stale (1 quarter behind) |
| BlackRock, Inc. trimmed | 1,164 | $17K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| SCP Investment, LP | 100,000 | $1M | 1.8% | 2025-Q4 stale (2 quarters behind) |
| TWO SIGMA ADVISERS, LP added | 36,995 | $516K | 0.7% | 2025-Q4 stale (2 quarters behind) |
| OneDigital Investment Advisors LLC trimmed | 20,326 | $284K | 0.4% | 2025-Q4 stale (2 quarters behind) |
| XTX Topco Ltd trimmed | 17,124 | $239K | 0.3% | 2025-Q4 stale (2 quarters behind) |
| Johnson Financial Group, Inc. | 10,000 | $140K | 0.2% | 2025-Q4 stale (2 quarters behind) |
| Tower Research Capital LLC (TRC) trimmed | 772 | $11K | 0.0% | 2025-Q4 stale (2 quarters behind) |
| Cubist Systematic Strategies, LLC new | 13,699 | $224K | 0.3% | 2025-Q3 stale (3 quarters behind) |
| Graham Capital Management, L.P. new | 13,520 | $221K | 0.3% | 2025-Q3 stale (3 quarters behind) |
| NJ State Employees Deferred Compensation Plan | 10,900 | $179K | 0.2% | 2025-Q3 stale (3 quarters behind) |
| MERCER GLOBAL ADVISORS INC /ADV trimmed | 10,025 | $164K | 0.2% | 2025-Q3 stale (3 quarters behind) |
| China Universal Asset Management Co., Ltd. trimmed | 3,534 | $58K | 0.1% | 2025-Q3 stale (3 quarters behind) |
| GPS Wealth Strategies Group, LLC | 2,000 | $33K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| Banque Cantonale Vaudoise trimmed | 1,957 | $32K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| Mirae Asset Global Investments Co., Ltd. added | 779 | $13K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| Trexquant Investment LP new | 32,686 | $530K | 0.7% | 2025-Q2 stale (4 quarters behind) |
| Headlands Technologies LLC new | 2,682 | $44K | 0.1% | 2025-Q2 stale (4 quarters behind) |
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.