ALKS · Insider trading · 13F holders · Congress trades
Alkermes plc. (ALKS)
Who is buying and selling ALKS: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 39
- Insider buys, 90 days
- $0
- Insider sales, 90 days
- $3.8M
- Congress trades, 12 months
- 2
ALKS at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 4 ALKS insiders filed 7 sales worth $3.8M on SEC Form 4, and no open-market purchases; 6 of the sales were pre-planned under Rule 10b5-1.
- 39 13F filers hold ALKS among their 50 largest positions, worth $2.0B combined, including Julian and Felix Baker and Jim Simons. The biggest bets by portfolio weight are Commodore Capital LP (9.4%), Bain Capital Life Sciences Investors, LLC (6.0%) and Spruce Street Capital LP (5.6%). In their latest 13Fs, 1 manager opened a new position and 9 added to one.
- Members of Congress have disclosed 2 ALKS trades since 2026, 2 purchases and 0 sales in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Sep 29, 2026.
- ALKS last closed at $45.37 on Oct 29, 2026.
ALKS insider trading
Between Aug 1, 2026 and Oct 29, 2026, 4 ALKS insiders filed 7 sales worth $3.8M on SEC Form 4, and no open-market purchases; 6 of the sales were pre-planned under Rule 10b5-1.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Oct 2, 2026 | Gaffin David Joseph | EVP, CLO, Alkermes, Inc. | Sale10b5-1 | 2,034 | $41.03 | $83K | SEC |
| Sep 3, 2026 | Gaffin David Joseph | EVP, CLO, Alkermes, Inc. | Sale10b5-1 | 2,034 | $48.01 | $98K | SEC |
| Sep 1, 2026 | Hopkinson Craig C. | EVP R&D, Chief Medical Officer | Sale10b5-1 | 9,000 | $46.99 | $423K | SEC |
| Aug 17, 2026 | Nichols Christian Todd | SVP, Chief Commercial Officer | Sale10b5-1 | 7,576 | $49.23 | $373K | SEC |
| Aug 3, 2026 | snyderman nancy lynn MD | Director | Sale | 44,472 | $50.35 | $2.2M | SEC |
| Aug 3, 2026 | Hopkinson Craig C. | EVP R&D, Chief Medical Officer | Sale10b5-1 | 9,000 | $48.58 | $437K | SEC |
| Aug 3, 2026 | Gaffin David Joseph | EVP, CLO, Alkermes, Inc. | Sale10b5-1 | 2,034 | $48.58 | $99K | SEC |
Who owns ALKS? Hedge funds and superinvestors
39 13F filers hold ALKS among their 50 largest positions, worth $2.0B combined, including Julian and Felix Baker and Jim Simons. The biggest bets by portfolio weight are Commodore Capital LP (9.4%), Bain Capital Life Sciences Investors, LLC (6.0%) and Spruce Street Capital LP (5.6%). In their latest 13Fs, 1 manager opened a new position and 9 added to one.
Superinvestors holding ALKS: Julian and Felix Baker 2.6% · Jim Simons 0.5%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Julian and Felix BakerHedge fund | 2.6% | $524.6M | 10,012,267 | +0.0% shares | Q2 2026 |
| Jim SimonsHedge fund | 0.5% | $338.5M | 6,460,928 | +4.9% shares | Q2 2026 |
| Deep Track Capital, LPHedge fund | 3.1% | $209.6M | 4,000,000 | +11.4% shares | Q2 2026 |
| Commodore Capital LPHedge fund | 9.4% | $157.2M | 3,000,000 | -28.6% shares | Q2 2026 |
| Bvf Inc/ilInvestment manager | 2.9% | $112.9M | 2,154,704 | +7.7% shares | Q2 2026 |
| Bain Capital Life Sciences Investors, LLCAsset manager | 6.0% | $101.5M | 1,937,938 | +217.7% shares | Q2 2026 |
| Rtw Investments, LPHedge fund | 0.7% | $87.6M | 1,672,356 | +0.0% shares | Q2 2026 |
| Affinity Asset Advisors, LLCHedge fund | 2.9% | $58.9M | 1,125,000 | -16.7% shares | Q2 2026 |
| Soleus Capital Management, L.P.Hedge fund | 1.9% | $53.9M | 1,029,252 | -47.8% shares | Q2 2026 |
| Summit Partners Public Asset Management, LLCHedge fund | 1.3% | $49.8M | 950,234 | — | Q2 2026 |
| Frazier Life Sciences Management, L.P.Hedge fund | 0.8% | $36.7M | 700,647 | +0.0% shares | Q2 2026 |
| Spruce Street Capital LPHedge fund | 5.6% | $28.5M | 543,876 | +71.0% shares | Q2 2026 |
| Artia Global Partners LPHedge fund | 4.5% | $23.5M | 448,964 | New | Q2 2026 |
| Gendell Jeffrey LInvestment manager | 0.2% | $20.7M | 395,882 | — | Q2 2026 |
| Prosight Management, LPHedge fund | 3.6% | $20.7M | 394,389 | -23.2% shares | Q2 2026 |
| Rice Hall James & Associates, LLCAsset manager | 1.0% | $20.5M | 390,866 | +0.1% shares | Q2 2026 |
| Eagle Health Investments LPHedge fund | 2.6% | $15.6M | 297,302 | +24.6% shares | Q2 2026 |
| Senator Investment Group LPHedge fund | 0.5% | $14.4M | 275,000 | +17.0% shares | Q2 2026 |
| C WorldWide Group Holding A/SInvestment manager | 0.3% | $13.1M | 250,000 | — | Q2 2026 |
| Stempoint Capital LPHedge fund | 2.2% | $13.0M | 248,015 | +208.1% shares | Q2 2026 |
| S&co IncWealth manager | 0.7% | $12.8M | 244,760 | +0.0% shares | Q2 2026 |
| Palo Alto Investors LPHedge fund | 1.8% | $12.7M | 242,560 | +0.0% shares | Q2 2026 |
| Atle Fund Management ABAsset manager | 3.0% | $11.2M | 213,329 | -12.0% shares | Q2 2026 |
| BFC Planning, Inc.Wealth manager | 0.4% | $10.8M | 206,009 | — | Q2 2026 |
| Tetragon Partners GP LtdHedge fund | 1.6% | $10.0M | 189,979 | +18.9% shares | Q2 2026 |
| HighVista Strategies LLCHedge fund | 2.1% | $9.4M | 179,256 | +144.9% shares | Q2 2026 |
| Knott David M JrInvestment manager | 3.4% | $6.4M | 121,759 | +1.5% shares | Q2 2026 |
| Silverarc Capital Management, LLCHedge fund | 0.7% | $5.9M | 113,494 | -75.3% shares | Q2 2026 |
| DAFNA Capital Management LLCHedge fund | 1.0% | $5.3M | 101,266 | -27.4% shares | Q2 2026 |
| Neo Ivy Capital ManagementAsset manager | 1.2% | $5.0M | 95,741 | — | Q2 2026 |
The 30 largest of 39 positions, by value. Each manager counts with its latest 13F (Q3 2026: 2, Q2 2026: 36, Q1 2026: 1). Screen ALKS in the grand portfolio →
ALKS stock trades by members of Congress
Members of Congress have disclosed 2 ALKS trades since 2026, 2 purchases and 0 sales in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Sep 29, 2026.
| Filed | Member | Trade | Amount | Traded | Since |
|---|---|---|---|---|---|
| Oct 12, 2026 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $1K–15K | Sep 29, 2026 | +11.1% |
| Sep 4, 2026 | Gilbert Ray Cisneros, Jr.D-CA · House | Buy | $15K–50K | Jul 30, 2026 | -9.4% |
Analysis mentioning ALKS
Posts from the blog that cover Alkermes plc., newest first.
ALKS questions and answers
Are insiders buying ALKS stock?
Between Aug 1, 2026 and Oct 29, 2026, 4 ALKS insiders filed 7 sales worth $3.8M on SEC Form 4, and no open-market purchases; 6 of the sales were pre-planned under Rule 10b5-1.
Which hedge funds own ALKS?
39 13F filers hold ALKS among their 50 largest positions, worth $2.0B combined, including Julian and Felix Baker and Jim Simons. The biggest bets by portfolio weight are Commodore Capital LP (9.4%), Bain Capital Life Sciences Investors, LLC (6.0%) and Spruce Street Capital LP (5.6%). In their latest 13Fs, 1 manager opened a new position and 9 added to one.
Has Congress traded ALKS?
Members of Congress have disclosed 2 ALKS trades since 2026, 2 purchases and 0 sales in the past year; the latest was Gilbert Ray Cisneros, Jr. (D-CA), buying $1K–15K on Sep 29, 2026.
Who is the largest holder of ALKS?
Among 13F filers, Julian and Felix Baker reports the largest ALKS position, $524.6M (10,012,267 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Commodore Capital LP's: 9.4% of its portfolio.
Cite or share this
Free to use with a link back. The data updates every filing day.