Who Owns SIONNA THERAPEUTICS INC (SION)? -- Institutional Holders (2026-06-30)

155 institutions reported holding $2.12B of SIONNA THERAPEUTICS INC (SION) in SEC 13F filings for 2026-06-30. Largest institutional holders: RA CAPITAL MANAGEMENT, L.P. ($435.7M), TPG GP A, LLC ($285.7M), VIKING GLOBAL INVESTORS LP ($140.6M), Atlas Venture Life Science Advisors, LLC ($131.8M), ORBIMED ADVISORS LLC ($112.4M). Source: SEC Form 13F.

Rank	Institution	Value	Shares	Change
1	RA CAPITAL MANAGEMENT, L.P.	$435.7M	9.9M	Hold
2	TPG GP A, LLC	$285.7M	6.5M	Hold
3	VIKING GLOBAL INVESTORS LP	$140.6M	3.2M	Hold
4	Atlas Venture Life Science Advisors, LLC	$131.8M	3.0M	Hold
5	ORBIMED ADVISORS LLC	$112.4M	2.6M	Trimmed
6	ENAVATE SCIENCES GP, LLC	$109.0M	2.5M	Hold
7	ADAGE CAPITAL PARTNERS GP, L.L.C.	$70.4M	1.6M	Added
8	VANGUARD GROUP INC	$65.9M	1.5M	Added
9	BlackRock, Inc.	$64.9M	1.5M	Added
10	JPMORGAN CHASE & CO	$64.1M	1.5M	Added
11	JENNISON ASSOCIATES LLC	$51.6M	1.2M	Trimmed
12	CITADEL ADVISORS LLC	$50.9M	1.2M	Trimmed
13	STATE STREET CORP	$44.9M	1.0M	Added
14	PERCEPTIVE ADVISORS LLC	$39.8M	905,000	Added
15	DEERFIELD MANAGEMENT COMPANY, L.P.	$30.0M	680,916	Trimmed
16	Siren, L.L.C.	$26.9M	610,515	Added
17	PRICE T ROWE ASSOCIATES INC /MD/	$21.0M	478,016	Trimmed
18	EVENTIDE ASSET MANAGEMENT, LLC	$20.9M	474,981	Trimmed
19	GEODE CAPITAL MANAGEMENT, LLC	$20.1M	457,145	Added
20	BAKER BROS. ADVISORS LP	$17.6M	400,000	Hold
21	Casdin Capital, LLC	$17.6M	400,000	New
22	GOLDMAN SACHS GROUP INC	$17.1M	388,810	Added
23	Driehaus Capital Management LLC	$17.0M	385,447	Added
24	MILLENNIUM MANAGEMENT LLC	$14.3M	325,333	Added
25	FRANKLIN RESOURCES INC	$12.8M	290,113	Added

Source: SEC Form 13F filings · as of 2026-06-30