Amarin Corporation plc
Amarin Corporation plc (AMRN) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · AMRN · as of Sep 30, 2025
Ownership Breakdown
96
Institutional Holders
▲ 3 vs Q2
$65.82M
Total Inst. Value
▲ $9.09M vs Q2
20.68M
Shares Outstanding
freeFloat 100.14%
4.00M
13F Shares Held
▲ 483,707 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
AMRN largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
SARISSA CAPITAL MANAGEMENT LP pharmaceutical preparations | 1.24M | 29.94% | 29.94% | $20.35B | Nov 14, 2025 | — held |
KYNAM CAPITAL MANAGEMENT, LP pharmaceutical preparations | 576.1K | 13.88% | 13.88% | $9.44B | Nov 14, 2025 | — held |
ACADIAN ASSET MANAGEMENT LLC pharmaceutical preparations | 456.6K | 11.00% | 11.00% | $7.46B | Nov 13, 2025 | ▲ 215.5K |
MORGAN STANLEY pharmaceutical preparations | 269.7K | 6.51% | 6.51% | $4.42B | May 27, 2026 | ▲ 106.7K |
EVERSEPT PARTNERS, LP pharmaceutical preparations | 167.3K | 4.03% | 4.03% | $2.74B | Nov 14, 2025 | — held |
SUSQUEHANNA INTERNATIONAL GROUP, LLP pharmaceutical preparations | 140.3K | 3.38% | 3.38% | $2.30B | Nov 14, 2025 | ▼ 30.9K |
MILLENNIUM MANAGEMENT LLC pharmaceutical preparations | 132.4K | 3.19% | 3.19% | $2.17B | Nov 14, 2025 | ▲ 87.1K |
CITADEL ADVISORS LLC pharmaceutical preparations | 122.3K | 2.95% | 2.95% | $2.00B | Nov 14, 2025 | ▲ 76.8K |
SCP INVESTMENT, LP pharmaceutical preparations | 100.0K | 2.41% | 2.41% | $1.64B | Nov 7, 2025 | ▼ 25.0K |
BNP PARIBAS ARBITRAGE, SNC pharmaceutical preparations | 87.4K | 2.11% | 2.11% | $1.43B | Nov 13, 2025 | ▲ 11.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+623.8K shares6
New Positions
first time holders14
Decreased
−161.0K shares0
Sold Out
fully exitedNet shares change (top 50)
+462.8K
+623.8K / −161.0K
Net new holders
+14
6 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
AMRN insider trading · insider activity
Source: SEC Form 4
2
Buy transactions
1
Sell transactions
2.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Bonfiglio Patrice Eadon director | Apr 18, 2026 | Tax Withhold | 403 | $14.98 | $6.0K | 836 | Form 4 ↗ |
Cohen Paul director | Apr 18, 2026 | Tax Withhold | 403 | $14.98 | $6.0K | 836 | Form 4 ↗ |
Sterling Louis III director | Apr 18, 2026 | Tax Withhold | 403 | $14.98 | $6.0K | 4.0K | Form 4 ↗ |
Sullivan Diane E. director | Apr 18, 2026 | Tax Withhold | 403 | $14.98 | $6.0K | 836 | Form 4 ↗ |
Odysseas Kostas D director | Apr 18, 2026 | Tax Withhold | 403 | $14.98 | $6.0K | 836 | Form 4 ↗ |
Horn Keith director | Apr 18, 2026 | Tax Withhold | 403 | $14.98 | $6.0K | 836 | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Amarin Corporation plc (AMRN) is primarily owned by institutional investors, who hold approximately 19.4% of total shares outstanding. Company insiders own approximately 0.00%, while retail and public investors account for the remaining 80.78%.
The largest institutional shareholder of Amarin Corporation plc is SARISSA CAPITAL MANAGEMENT LP, holding approximately 1.24 million shares — equal to 29.94% of outstanding shares — as of September 30, 2025.
A total of 96 institutional investors currently hold AMRN stock, with a combined institutional value of approximately $65,820,012 as of the most recent 13F filing period.
Frequently asked questions
AMRN ownershipAmarin Corporation plc (AMRN) is primarily owned by institutional investors, who hold approximately 19.4% of shares. The largest shareholder is SARISSA CAPITAL MANAGEMENT LP with a 29.94% stake. Company insiders hold 0.00%. Data sourced from SEC Form 13F as of September 30, 2025.