Supply breakdown
Shares as of Oct 23, 2026| Category | Shares | % | Value | Status |
|---|---|---|---|---|
| Circulating | 133.94M | 100.0% | $40.32B | Estimated |
| Free float | - | - | - | Unavailable |
| Insider-held, unrestricted | - | - | - | Unavailable |
| Locked team funds | 0 | 0.0% | $0 | Unavailable |
| Other restricted | 0 | 0.0% | $0 | Unavailable |
| Total outstanding | 133.94M | 100.0% | $40.32B | Verified |
| Ownership views (overlap the categories above, never added) | ||||
| Institutional holdings (13F) | 133.34M | 99.6% | $40.14B | 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: circulating + locked team + other restricted = total outstanding reconciles.
Valuation
- Traditional$40.32B
- Fully diluted$41.59B
- Circulating$40.32B
- Free float-
- Locked team value$0
- Other restricted value$0
Locked and restricted shares
Not reviewed yet.
Institutional holders
| Holder | Shares | % of total |
|---|---|---|
| FMR LLC | 15.02M | 11.22% |
| Capital World Investors | 11.14M | 8.32% |
| BlackRock, Inc. | 10.91M | 8.14% |
| Capital Research Global Investors | 9.75M | 7.28% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 6.54M | 4.88% |
| VANGUARD CAPITAL MANAGEMENT LLC | 6.03M | 4.50% |
| T. Rowe Price Investment Management, Inc. | 5.64M | 4.21% |
| Invesco Ltd. | 3.75M | 2.80% |
| STATE STREET CORP | 3.56M | 2.65% |
| JPMORGAN CHASE & CO | 2.68M | 2.00% |
Insiders
Forms 3, 4 and 5Form 4 aggregation pending
Share classes
| Class | Listing | Shares outstanding | As of |
|---|---|---|---|
| Common stock | ALNY on Nasdaq | 133,937,576 | Oct 23, 2026 |
Notes and sources
- ALNYLAM PHARMACEUTICALS, INC. 10-Q for period ended 2026-09-30, Cover page (0001178670-26-000076)
- SEC public float (non-affiliates): $42.63B as of Jun 30, 2025, from the 10-K cover. It is a dollar value at a past date, not circulating supply.