Who owns Amarin Corporation plc (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-Q1 13F filings (latest filed 2026-05-15). 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
6 tracked funds added or opened AMRN while 9 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
AMRN’s largest tracked holder by dollar value, Sarissa Capital Management LP, sizes it at 15.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 15.3pp 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 2025-Q4 and 2026-Q1, across 68 tracked filers holding AMRN, 27 increased or opened the position and 33 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 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.
Full exits 2
- SCP Investment, LP$1M
- TWO SIGMA ADVISERS, LP$516K
Largest adds
- Point72 Asset Management, L.P.$3M
- MILLENNIUM MANAGEMENT LLC$2M
- Kynam Capital Management, LP$1M
- ACADIAN ASSET MANAGEMENT LLC$1M
- Sarissa Capital Management LP$845K
- Waterfront Wealth Inc.$675K
Largest trims
- CITADEL ADVISORS LLC$1M
- NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$433K
- MORGAN STANLEY$367K
- BNP PARIBAS FINANCIAL MARKETS$364K
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$318K
- Eversept Partners, LP$267K
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 | $24M | 32.4% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 636,769 | $9M | 12.3% | 2026-Q1 |
| Kynam Capital Management, LP added | 472,382 | $7M | 9.2% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 300,536 | $4M | 5.8% | 2026-Q1 |
| MORGAN STANLEY trimmed | 293,172 | $4M | 5.7% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 240,761 | $3M | 4.7% | 2026-Q1 |
| Waterfront Wealth Inc. added | 203,338 | $3M | 3.9% | 2026-Q1 |
| Eversept Partners, LP trimmed | 147,715 | $2M | 2.9% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 107,542 | $2M | 2.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 80,575 | $1M | 1.6% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 75,503 | $1M | 1.5% | 2026-Q1 |
| LCM Capital Management Inc added | 43,462 | $628K | 0.8% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 37,667 | $545K | 0.7% | 2026-Q1 |
| STATE STREET CORP added | 24,949 | $361K | 0.5% | 2026-Q1 |
| Bleakley Financial Group, LLC added | 23,564 | $341K | 0.5% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 19,256 | $278K | 0.4% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 19,075 | $276K | 0.4% | 2026-Q1 |
| State of New Jersey Common Pension Fund D | 18,879 | $273K | 0.4% | 2026-Q1 |
| COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS | 18,370 | $266K | 0.4% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 18,216 | $263K | 0.4% | 2026-Q1 |
| Brooklands Fund Management Ltd added | 15,596 | $226K | 0.3% | 2026-Q1 |
| State of Tennessee, Department of Treasury | 15,004 | $217K | 0.3% | 2026-Q1 |
| Quinn Opportunity Partners LLC | 14,305 | $207K | 0.3% | 2026-Q1 |
| UBS Group AG added | 13,192 | $191K | 0.3% | 2026-Q1 |
| Hayek Kallen Investment Management trimmed | 12,809 | $185K | 0.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 11,918 | $172K | 0.2% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC | 11,771 | $170K | 0.2% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 11,380 | $165K | 0.2% | 2026-Q1 |
| OSAIC HOLDINGS, INC. trimmed | 9,391 | $136K | 0.2% | 2026-Q1 |
| Steward Partners Investment Advisory, LLC added | 8,966 | $130K | 0.2% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND | 7,605 | $110K | 0.1% | 2026-Q1 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO added | 5,750 | $83K | 0.1% | 2026-Q1 |
| Federation des caisses Desjardins du Quebec | 4,615 | $67K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 3,339 | $48K | 0.1% | 2026-Q1 |
| EverSource Wealth Advisors, LLC new | 234 | $44K | 0.1% | 2026-Q1 |
| NATIONAL BANK OF CANADA /FI/ added | 2,518 | $36K | 0.0% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 1,953 | $29K | 0.0% | 2026-Q1 |
| BlackRock, Inc. trimmed | 1,164 | $17K | 0.0% | 2026-Q1 |
| Farther Finance Advisors, LLC added | 962 | $14K | 0.0% | 2026-Q1 |
| IFP Advisors, Inc added | 814 | $12K | 0.0% | 2026-Q1 |
| Beaird Harris Wealth Management, LLC | 750 | $11K | 0.0% | 2026-Q1 |
| SCP Investment, LP | 100,000 | $1M | 1.9% | 2025-Q4 stale |
| George Kaiser Family Foundation new | 38,197 | $620K | 0.8% | 2025-Q2 stale |
| Trexquant Investment LP added | 32,686 | $530K | 0.7% | 2025-Q2 stale |
| TWO SIGMA ADVISERS, LP added | 36,995 | $516K | 0.7% | 2025-Q4 stale |
| JANE STREET GROUP, LLC added | 32,832 | $458K | 0.6% | 2025-Q4 stale |
| SEI INVESTMENTS CO | 29,212 | $408K | 0.5% | 2025-Q4 stale |
| GSA CAPITAL PARTNERS LLP trimmed | 853,349 | $382K | 0.5% | 2025-Q1 stale |
| Jump Financial, LLC added | 26,900 | $375K | 0.5% | 2025-Q4 stale |
| Quadrature Capital Ltd new | 18,346 | $300K | 0.4% | 2025-Q3 stale |
| OneDigital Investment Advisors LLC trimmed | 20,326 | $284K | 0.4% | 2025-Q4 stale |
| XTX Topco Ltd trimmed | 17,124 | $239K | 0.3% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC trimmed | 13,699 | $224K | 0.3% | 2025-Q3 stale |
| Graham Capital Management, L.P. trimmed | 13,520 | $221K | 0.3% | 2025-Q3 stale |
| NJ State Employees Deferred Compensation Plan | 10,900 | $179K | 0.2% | 2025-Q3 stale |
| EntryPoint Capital, LLC new | 12,542 | $175K | 0.2% | 2025-Q4 stale |
| MERCER GLOBAL ADVISORS INC /ADV trimmed | 10,025 | $164K | 0.2% | 2025-Q3 stale |
| Johnson Financial Group, Inc. | 10,000 | $140K | 0.2% | 2025-Q4 stale |
| MACQUARIE GROUP LTD added | 286,210 | $128K | 0.2% | 2025-Q1 stale |
| Stonepine Capital Management, LLC added | 651,614 | $105K | 0.1% | 2025-Q1 stale |
| Cutter & CO Brokerage, Inc. trimmed | 230,020 | $104K | 0.1% | 2025-Q1 stale |
| Aptus Capital Advisors, LLC | 11,420 | $102K | 0.1% | 2025-Q1 stale |
| COMMONWEALTH EQUITY SERVICES, LLC added | 159,396 | $71K | 0.1% | 2025-Q1 stale |
| LPL Financial LLC added | 153,035 | $69K | 0.1% | 2025-Q1 stale |
| China Universal Asset Management Co., Ltd. trimmed | 3,534 | $58K | 0.1% | 2025-Q3 stale |
| TWO SIGMA SECURITIES, LLC added | 107,799 | $48K | 0.1% | 2025-Q1 stale |
| Generation Capital Management LLC | 104,000 | $47K | 0.1% | 2025-Q1 stale |
| Headlands Technologies LLC added | 2,682 | $44K | 0.1% | 2025-Q2 stale |
| KORNITZER CAPITAL MANAGEMENT INC /KS added | 88,200 | $40K | 0.1% | 2025-Q1 stale |
| Janney Montgomery Scott LLC trimmed | 78,262 | $35K | 0.0% | 2025-Q1 stale |
| GPS Wealth Strategies Group, LLC | 2,000 | $33K | 0.0% | 2025-Q3 stale |
| Banque Cantonale Vaudoise trimmed | 1,957 | $32K | 0.0% | 2025-Q3 stale |
| AXA S.A. trimmed | 61,937 | $28K | 0.0% | 2025-Q1 stale |
| Arkfeld Wealth Strategies, L.L.C. | 58,000 | $27K | 0.0% | 2025-Q1 stale |
| Stratos Wealth Partners, LTD. | 52,153 | $23K | 0.0% | 2025-Q1 stale |
| SFMG, LLC new | 50,000 | $22K | 0.0% | 2025-Q1 stale |
| J.W. COLE ADVISORS, INC. added | 44,167 | $20K | 0.0% | 2025-Q1 stale |
| Arcadia Wealth Management, Inc. | 42,834 | $19K | 0.0% | 2025-Q1 stale |
| NewEdge Advisors, LLC added | 1,370 | $19K | 0.0% | 2025-Q4 stale |
| RFP Financial Group LLC new | 40,000 | $18K | 0.0% | 2025-Q1 stale |
| Newbridge Financial Services Group, Inc. | 37,400 | $17K | 0.0% | 2025-Q1 stale |
| R Squared Ltd added | 37,360 | $17K | 0.0% | 2025-Q1 stale |
| Williams Jones Wealth Management, LLC. | 33,300 | $15K | 0.0% | 2025-Q1 stale |
| Significant Wealth Partners LLC trimmed | 32,969 | $15K | 0.0% | 2025-Q1 stale |
| Pine Valley Investments Ltd Liability Co | 31,000 | $14K | 0.0% | 2025-Q1 stale |
| NEUBERGER BERMAN GROUP LLC | 28,754 | $13K | 0.0% | 2025-Q1 stale |
| Creative Planning trimmed | 28,616 | $13K | 0.0% | 2025-Q1 stale |
| Mirae Asset Global Investments Co., Ltd. added | 779 | $13K | 0.0% | 2025-Q3 stale |
| Brookstone Capital Management | 27,365 | $12K | 0.0% | 2025-Q1 stale |
| Mariner, LLC trimmed | 26,590 | $12K | 0.0% | 2025-Q1 stale |
| Supplemental Annuity Collective Trust of NJ | 25,500 | $11K | 0.0% | 2025-Q1 stale |
| Cresset Asset Management, LLC | 24,877 | $11K | 0.0% | 2025-Q1 stale |
| Kestra Advisory Services, LLC trimmed | 24,196 | $11K | 0.0% | 2025-Q1 stale |
| Tower Research Capital LLC (TRC) trimmed | 772 | $11K | 0.0% | 2025-Q4 stale |
| Quarry LP new | 655 | $11K | 0.0% | 2025-Q3 stale |
| MML INVESTORS SERVICES, LLC trimmed | 21,247 | $10K | 0.0% | 2025-Q1 stale |
| BECK MACK & OLIVER LLC | 22,000 | $10K | 0.0% | 2025-Q1 stale |
| Savvy Advisors, Inc. added | 21,900 | $10K | 0.0% | 2025-Q1 stale |
| Garden State Investment Advisory Services LLC | 21,400 | $10K | 0.0% | 2025-Q1 stale |
| PFG Investments, LLC | 20,200 | $9K | 0.0% | 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.