Ionis Pharmaceuticals, Inc. (IONS) ownership: Top institutional holder: FMR LLC ($1.84B). Insider activity: Net Seller (0 buys, 20 sells). 1 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| FMR LLC | 24556637.00 | $1.84B | 2026-03-31 |
| Capital World Investors | 21186369.00 | $1.59B | 2026-03-31 |
| VANGUARD GROUP INC | 16440459.00 | $1.30B | 2025-12-31 |
| BlackRock, Inc. | 10442476.00 | $784.13M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 7808902.00 | $586.37M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 7118330.00 | $534.52M | 2026-03-31 |
| WELLINGTON MANAGEMENT GROUP LLP | 6391816.00 | $479.96M | 2026-03-31 |
| T. Rowe Price Investment Management, Inc. | 6159027.00 | $462.48M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-12 | |
| Sell | null | 2026-06-12 | |
| Sell | null | 2026-06-12 | |
| Sell | null | 2026-06-12 | |
| Sell | null | 2026-06-12 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.