WALTHAM, MA
SIONNA THERAPEUTICS, INC.SION— Latest position per institution from SEC 13F filings
15
Institutional holders
42.06M
Total shares held
1.78B
Estimated value
2.10M
Avg. position size
RA CAPITAL MANAGEMENT, L.P.
CIK 1346824
Shares
9.91M
Value
435.72M
Filed
Jun 30, 2026
TPG GP A, LLC
CIK 1903793
Shares
6.49M
Value
285.71M
Filed
Jun 30, 2026
VIKING GLOBAL INVESTORS LP
CIK 1103804
Shares
3.20M
Value
140.56M
Filed
Jun 30, 2026
ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC
CIK 1917529
Shares
3M
Value
131.78M
Filed
Jun 30, 2026
ORBIMED ADVISORS LLC
CIK 1055951
Shares
2.56M
Value
112.43M
Filed
Jun 30, 2026
ENAVATE SCIENCES GP, LLC
CIK 1953107
Shares
2.48M
Value
109.01M
Filed
Jun 30, 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 1165408
Shares
1.60M
Value
70.38M
Filed
Jun 30, 2026
JPMORGAN CHASE & CO
CIK 19617
Shares
1.49M
Value
64.09M
Filed
Jun 30, 2026
BLACKROCK, INC.
CIK 2012383
Shares
1.47M
Value
64.88M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
1.18M
Value
48.75M
Filed
Dec 31, 2025
JENNISON ASSOCIATES LLC
CIK 53417
Shares
1.17M
Value
51.56M
Filed
Jun 30, 2026
CITADEL ADVISORS LLC
CIK 1423053
Shares
1.16M
Value
50.85M
Filed
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
1.13M
Value
49.80M
Filed
Jun 30, 2026
Y-INTERCEPT (HONG KONG) LTD
CIK 1772875
Shares
1.06M
Value
5.56M
Filed
Sep 30, 2026
STATE STREET CORP
CIK 93751
Shares
1.02M
Value
44.94M
Filed
Jun 30, 2026
PERCEPTIVE ADVISORS LLC
CIK 1224962
Shares
905K
Value
39.81M
Filed
Jun 30, 2026
DEERFIELD MANAGEMENT COMPANY, L.P.
CIK 1009258
Shares
680.92K
Value
29.95M
Filed
Jun 30, 2026
SIREN, L.L.C.
CIK 2005245
Shares
610.51K
Value
26.86M
Filed
Jun 30, 2026
PRICE T ROWE ASSOCIATES INC /MD/
CIK 80255
Shares
478.02K
Value
21.03K
Filed
Jun 30, 2026
EVENTIDE ASSET MANAGEMENT, LLC
CIK 1442891
Shares
474.98K
Value
20.89M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | RA CAPITAL MANAGEMENT, L.P. | 1346824 | 9.91M | 435.72M | Jun 30, 2026 |
| 2 | TPG GP A, LLC | 1903793 | 6.49M | 285.71M | Jun 30, 2026 |
| 3 | VIKING GLOBAL INVESTORS LP | 1103804 | 3.20M | 140.56M | Jun 30, 2026 |
| 4 | ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | 1917529 | 3M | 131.78M | Jun 30, 2026 |
| 5 | ORBIMED ADVISORS LLC | 1055951 | 2.56M | 112.43M | Jun 30, 2026 |
| 6 | ENAVATE SCIENCES GP, LLC | 1953107 | 2.48M | 109.01M | Jun 30, 2026 |
| 7 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1165408 | 1.60M | 70.38M | Jun 30, 2026 |
| 8 | JPMORGAN CHASE & CO | 19617 | 1.49M | 64.09M | Jun 30, 2026 |
| 9 | BLACKROCK, INC. | 2012383 | 1.47M | 64.88M | Jun 30, 2026 |
| 10 | VANGUARD GROUP INC | 102909 | 1.18M | 48.75M | Dec 31, 2025 |
| 11 | JENNISON ASSOCIATES LLC | 53417 | 1.17M | 51.56M | Jun 30, 2026 |
| 12 | CITADEL ADVISORS LLC | 1423053 | 1.16M | 50.85M | Jun 30, 2026 |
| 13 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 1.13M | 49.80M | Jun 30, 2026 |
| 14 | Y-INTERCEPT (HONG KONG) LTD | 1772875 | 1.06M | 5.56M | Sep 30, 2026 |
| 15 | STATE STREET CORP | 93751 | 1.02M | 44.94M | Jun 30, 2026 |
| 16 | PERCEPTIVE ADVISORS LLC | 1224962 | 905K | 39.81M | Jun 30, 2026 |
| 17 | DEERFIELD MANAGEMENT COMPANY, L.P. | 1009258 | 680.92K | 29.95M | Jun 30, 2026 |
| 18 | SIREN, L.L.C. | 2005245 | 610.51K | 26.86M | Jun 30, 2026 |
| 19 | PRICE T ROWE ASSOCIATES INC /MD/ | 80255 | 478.02K | 21.03K | Jun 30, 2026 |
| 20 | EVENTIDE ASSET MANAGEMENT, LLC | 1442891 | 474.98K | 20.89M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.