Supply breakdown
Shares as of Jul 23, 2026| Category | Shares | % | Value | Status |
|---|---|---|---|---|
| Circulating | 166.18M | 100.0% | $13.18B | Estimated |
| Free float | - | - | - | Unavailable |
| Insider-held, unrestricted | - | - | - | Unavailable |
| Locked team funds | - | - | - | Unavailable |
| Other restricted (unlisted classes only) | - | - | - | Unavailable |
| Total outstanding | 166.18M | 100.0% | $13.18B | Verified |
| Ownership views (overlap the categories above, never added) | ||||
| Institutional holdings (13F; over 100%, double counted) | 179.71M | 108.1% | $14.25B | 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$13.18B
- Fully diluted-
- Circulating$13.18B
- 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 |
|---|---|---|
| FMR LLC | 24.63M | 14.82% |
| Capital World Investors | 21.67M | 13.04% |
| BlackRock, Inc. | 10.70M | 6.44% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7.86M | 4.73% |
| WELLINGTON MANAGEMENT GROUP LLP | 7.65M | 4.60% |
| VANGUARD CAPITAL MANAGEMENT LLC | 7.21M | 4.34% |
| TWO SIGMA INVESTMENTS, LP | 6.25M | 3.76% |
| ROYAL BANK OF CANADA | 6.18M | 3.72% |
| STATE STREET CORP | 4.33M | 2.61% |
| T. Rowe Price Investment Management, Inc. | 3.96M | 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 108% 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 |
|---|---|---|---|
| Common stock | IONS on Nasdaq | 166,184,322 | Jul 23, 2026 |
Notes and sources
- IONIS PHARMACEUTICALS INC 10-Q for period ended 2026-06-30, Cover page (0000874015-26-000251)
- SEC public float (non-affiliates): $5.28B as of Jun 30, 2025, from the 10-K cover. It is a dollar value at a past date, not circulating supply.