T. Rowe Price Investment Management, Inc. - Sep 30, 2025 SCHEDULE 13G/A Report for IONIS PHARMACEUTICALS INC COMMON STOCK (IONS)

Filing Manager: T. Rowe Price Investment Management, Inc.
Reporting Manager: T. Rowe Price Investment Management, Inc.
Security: IONIS PHARMACEUTICALS INC COMMON STOCK
Symbol: IONS
Shares outstanding: 159M shares
Disclosed Ownership: 13.2M shares
Ownership: 8.3%
Form type: SCHEDULE 13G/A
Date filed: 11/14/2025, 12:18 PM
Date of event: Sep 30, 2025
Previous filing: Feb 7, 2025
SEC: View on sec.gov

Reporting Managers (1)

Name	Ownership	Shares Owned	sole voting power	shared voting power	Signature	Title	CIK
T. Rowe Price Investment Management, Inc.	8.3%	13.2M	13M	0	Ellen York	Vice President