Commodore Capital LP: ALKERMES PLC (ALKS): Quarterly 13F Position History
As of Q1 2026, Commodore Capital LP reported 4,200,000 shares of ALKERMES PLC (ALKS), worth $148.5M and representing 8.6% of its 13F equity book. Quarter-over-quarter share count change: + 650,000 (+18.3%) . The position first appeared in Q2 2024 and has been disclosed across 8 13F-HR filings in Pactolio's tracked window.
- 4,200,000Shares Held (Latest Filing)
- $148.5MReported Market Value (Latest Filing)
- 8.6%Portfolio Weight (% of 13F Equity Book)
- +650,000Quarter-over-Quarter Share Change
- +$49.2MQuarter-over-Quarter Value Change
- 4,200,000Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 8 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 4,200,000 | +650,000 | +18.3% | $148.5M | 8.6% | $35.4 |
| Q4 2025 | 3,550,000 | +453,246 | +14.6% | $99.3M | 6.6% | $28.0 |
| Q3 2025 | 3,096,754 | +646,754 | +26.4% | $92.9M | 4.5% | $30.0 |
| Q2 2025 | 2,450,000 | +500,000 | +25.6% | $70.1M | 4.9% | $28.6 |
| Q1 2025 | 1,950,000 | 350,000 | -15.2% | $64.4M | 4.7% | $33.0 |
| Q4 2024 | 2,300,000 | 600,000 | -20.7% | $66.1M | 4.8% | $28.8 |
| Q3 2024 | 2,900,000 | +1,525,000 | +110.9% | $81.2M | 5.1% | $28.0 |
| Q2 2024 | 1,375,000 | — | — | $33.1M | 2.3% | $24.1 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Commodore Capital LP first disclose a ALKS position in 13F-HR filings?
Commodore Capital LP first reported ALKERMES PLC (ALKS) on its 13F-HR filing for the period ending 2024-06-30 (Q2 2024). The position has appeared on 8 reported quarters within Pactolio's tracked window.
What was Commodore Capital LP's most recent quarter-over-quarter share-count change in ALKS?
Between Q4 2025 and Q1 2026, Commodore Capital LP added 650,000 shares of ALKS (+18.3%), bringing the total reported position to 4,200,000 shares at a market value of $148.5M.
Does the implied price-per-share represent Commodore Capital LP's cost basis in ALKS?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.