Supply breakdown
Shares as of Jul 23, 2026| Category | Shares | % | Value | Status |
|---|---|---|---|---|
| Circulating | 167.76M | 100.0% | $8.79B | Estimated |
| Free float | - | - | - | Unavailable |
| Insider-held, unrestricted | - | - | - | Unavailable |
| Locked team funds | - | - | - | Unavailable |
| Other restricted (unlisted classes only) | - | - | - | Unavailable |
| Total outstanding | 167.76M | 100.0% | $8.79B | Verified |
| Ownership views (overlap the categories above, never added) | ||||
| Institutional holdings (13F; over 100%, double counted) | 177.93M | 106.1% | $9.32B | Estimated |
| Insider-held, all (Forms 3, 4, 5) | - | - | - | Unavailable |
Institutional and insider holdings can include both tradable and locked shares, so they are shown for reference and never added to the total. Check: no class has more shares deducted than it has outstanding, and the review found no shares that may be counted twice: reconciles.
Valuation
- Traditional$8.79B
- Fully diluted$9.13B
- Circulating$8.79B
- Free float-
- Locked team value$0
- Other restricted value$0
Locked and restricted shares
Not reviewed yet.
Institutional holders
13F, quarter ended Jun 30, 2026| Holder | Shares | % of total |
|---|---|---|
| BlackRock, Inc. | 29.24M | 17.43% |
| BAKER BROS. ADVISORS LP | 10.01M | 5.97% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 9.49M | 5.66% |
| STATE STREET CORP | 9.16M | 5.46% |
| VANGUARD CAPITAL MANAGEMENT LLC | 7.52M | 4.48% |
| PRICE T ROWE ASSOCIATES INC /MD/ | 6.74M | 4.02% |
| RENAISSANCE TECHNOLOGIES LLC | 6.46M | 3.85% |
| GEODE CAPITAL MANAGEMENT, LLC | 4.48M | 2.67% |
| DIMENSIONAL FUND ADVISORS LP | 4.19M | 2.50% |
| Deep Track Capital, LP | 4.00M | 2.38% |
Sum of long share positions in Form 13F reports for the quarter. 13F covers managers with over $100M in US equities; some positions are reported by more than one filer. The total is 106% of shares outstanding, so it counts some shares twice: positions reported by more than one manager, and lent shares that appear at both the lender and the buyer. Read it as an upper bound.
Insiders
Forms 3, 4 and 5Form 4 aggregation pending
Share classes
| Class | Listing | Shares outstanding | As of |
|---|---|---|---|
| Ordinary shares | ALKS on Nasdaq | 167,763,272 | Jul 23, 2026 |
Notes and sources
- Alkermes plc. 10-Q for period ended 2026-06-30, Cover page (0001193125-26-319022)
- SEC public float (non-affiliates): $4.66B as of Jun 30, 2025, from the 10-K cover. It is a dollar value at a past date, not circulating supply.