Institutional Ownership
Ionis Pharmaceuticals Inc
CUSIP 462222100COMIONSQ1 2026
13D / 13G Filings
45
Schedule 13D/13G on record
Beneficial Filers
15
Distinct reporting persons
Largest Stake
15.0%
Max % of class reported
Institutional Holders
483
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
45 filings · latest Feb 17, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Feb 17, 2026 | T. Rowe Price Investment Management, Inc. | 13G/A | 5.6% | 9.11M | SEC |
| 2 | Jan 7, 2026 | Capital World Investors | 13G/A | 11.1% | 17.96M | SEC |
| 3 | Nov 14, 2025 | T. Rowe Price Investment Management, Inc. | 13G/A | 8.3% | 13.16M | SEC |
| 4 | Aug 12, 2025 | Wellington Management Group LLP | 13G/A | 4.3% | 6.88M | SEC |
| 5 | Apr 17, 2025 | Blackrock, Inc. | 13G/A | 5.7% | 9.07M | SEC |
| 6 | Feb 13, 2025 | Capital World Investors | 13G | 7.3% | 11.47M | SEC |
| 7 | Feb 7, 2025 | T. Rowe Price Investment Management, Inc. | 13G/A | 10.0% | 15.85M | SEC |
| 8 | Jan 8, 2025 | The Vanguard Group | 13G/A | 10.4% | 16.47M | SEC |
| 9 | Nov 14, 2024 | T. Rowe Price Investment Management, Inc. | 13G/A | 9.0% | 14.17M | SEC |
| 10 | Nov 14, 2024 | Bb Biotech AG | 13G/A | 5.0% | 850.0K | SEC |
35 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Ionis Pharmaceuticals Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Fmr LLC | 24.56M | $1.84B |
| 2 | Capital World Investors | 21.19M | $1.59B |
| 3 | Blackrock, Inc. | 10.44M | $784.13M |
| 4 | Wellington Management Group LLP | 6.39M | $479.96M |
| 5 | Two Sigma Investments, LP | 5.86M | $439.85M |
| 6 | Geode Capital Management, LLC | 3.98M | $305.20M |
| 7 | State Street Corp | 4.00M | $300.03M |
| 8 | Royal Bank Of Canada | 3.80M | $285.48M |
| 9 | Jpmorgan Chase & Co | 2.36M | $171.41M |
| 10 | Tweedy, Browne Co LLC | 2.28M | $170.88M |