Ionis Pharmaceuticals, Inc. (IONS) ownership: insiders 1% · institutions 96% · index and ETF funds 10% (13F 2026-03-31). Insider activity, 90 days: Insiders bought (19 sales, 2 open-market buys). 1 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | % Outstanding | Reported |
|---|---|---|---|---|
| FMR (Fidelity) | 24556637.00 | $1.84B | 14.8% | 2026-03-31 |
| Capital Group | 21509384.00 | $1.62B | 12.9% | 2026-03-31 |
| Vanguard | 16210998.00 | $1.22B | 9.8% | 2026-03-31 |
| BlackRock | 10442476.00 | $784.13M | 6.3% | 2026-03-31 |
| Wellington Management | 6391816.00 | $479.96M | 3.8% | 2026-03-31 |
| T. Rowe Price | 6159027.00 | $462.48M | 3.7% | 2026-03-31 |
| Two Sigma | 5857629.00 | $439.85M | 3.5% | 2026-03-31 |
| Geode Capital Management | 3984332.00 | $305.20M | 2.4% | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Buy | null | 2026-07-30 | |
| Buy | null | 2026-07-30 | |
| Sell | null | 2026-07-15 | |
| Sell | null | 2026-07-15 | |
| Sell | null | 2026-07-15 | |
| Sell | null | 2026-07-15 | |
| Sell | null | 2026-07-15 | |
| Sell | null | 2026-07-15 |
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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.