Quick Takeaways
- Capital World Investors filed SCHEDULE 13G/A for Ionis Pharmaceuticals, Inc. Common Stock (IONS).
- Disclosed ownership: 11%.
- Date of event: 31 Dec 2025.
Capital World Investors - 31 Dec 2025 SCHEDULE 13G/A Report for Ionis Pharmaceuticals, Inc. Common Stock (IONS)
- Filing Manager
- Capital World Investors
- Reporting Manager
- Capital World Investors
- Symbol
- IONS
- Shares outstanding
- 161,813,505 shares
- Disclosed Ownership
- 17,961,299 shares
- Ownership
- 11%
- Form type
- SCHEDULE 13G/A
- Filing time
- 07 Jan 2026, 19:48:26 UTC
- Date of event
- 31 Dec 2025
- Previous filing
- 13 Feb 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"Capital World Investors disclosed 11% ownership in Ionis Pharmaceuticals, Inc. Common Stock (IONS) on 31 Dec 2025."
What Changed
- Previous schedule filing date: 13 Feb 2025.
- Current filing was accepted on 07 Jan 2026, 19:48.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (1)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Capital World Investors | 11% | 17,961,299 | 17,961,299 | 0 | Timothy J. Moon | Vice President and Senior Counsel, Capital Research and Management Company |