BOSTON, MA
IRONWOOD PHARMACEUTICALS INCIRWD— Latest position per institution from SEC 13F filings
15
Institutional holders
166.12M
Total shares held
680.20M
Estimated value
8.31M
Avg. position size
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
22.88M
Value
149.16M
Filed
Jun 30, 2024
BLACKROCK, INC.
CIK 2012383
Shares
17.79M
Value
74.89M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
15.96M
Value
53.78M
Filed
Dec 31, 2025
ARMISTICE CAPITAL, LLC
CIK 1601086
Shares
13.93M
Value
58.65M
Filed
Jun 30, 2026
SARISSA CAPITAL MANAGEMENT LP
CIK 1577524
Shares
9.19M
Value
38.68M
Filed
Jun 30, 2026
STATE STREET CORP
CIK 93751
Shares
8.81M
Value
37.09M
Filed
Jun 30, 2026
BANK OF AMERICA CORP /DE/
CIK 70858
Shares
8.68M
Value
36.56M
Filed
Jun 30, 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 1037389
Shares
7.99M
Value
33.65M
Filed
Jun 30, 2026
BRAIDWELL LP
CIK 1920938
Shares
6.62M
Value
9.74M
Filed
Mar 31, 2025
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
6.61M
Value
27.82M
Filed
Jun 30, 2026
AQR CAPITAL MANAGEMENT LLC
CIK 1167557
Shares
6.47M
Value
27.22M
Filed
Jun 30, 2026
ACADIAN ASSET MANAGEMENT LLC
CIK 916542
Shares
5.85M
Value
24.62K
Filed
Jun 30, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
5.51M
Value
23.21M
Filed
Jun 30, 2026
KYNAM CAPITAL MANAGEMENT, LP
CIK 1907884
Shares
5.47M
Value
7.16M
Filed
Sep 30, 2025
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
4.83M
Value
20.35M
Filed
Jun 30, 2026
TWO SIGMA INVESTMENTS, LP
CIK 1179392
Shares
4.56M
Value
19.18M
Filed
Jun 30, 2026
MARSHALL WACE, LLP
CIK 1318757
Shares
4.29M
Value
18.06M
Filed
Jun 30, 2026
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 884414
Shares
4.07M
Value
17.12M
Filed
Jun 30, 2026
GOLDMAN SACHS GROUP INC
CIK 886982
Shares
3.31M
Value
13.95M
Filed
Jun 30, 2026
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 884546
Shares
3.30M
Value
13.90M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | BLACKROCK FINANCE, INC. | 1364742 | 22.88M | 149.16M | Jun 30, 2024 |
| 2 | BLACKROCK, INC. | 2012383 | 17.79M | 74.89M | Jun 30, 2026 |
| 3 | VANGUARD GROUP INC | 102909 | 15.96M | 53.78M | Dec 31, 2025 |
| 4 | ARMISTICE CAPITAL, LLC | 1601086 | 13.93M | 58.65M | Jun 30, 2026 |
| 5 | SARISSA CAPITAL MANAGEMENT LP | 1577524 | 9.19M | 38.68M | Jun 30, 2026 |
| 6 | STATE STREET CORP | 93751 | 8.81M | 37.09M | Jun 30, 2026 |
| 7 | BANK OF AMERICA CORP /DE/ | 70858 | 8.68M | 36.56M | Jun 30, 2026 |
| 8 | RENAISSANCE TECHNOLOGIES LLC | 1037389 | 7.99M | 33.65M | Jun 30, 2026 |
| 9 | BRAIDWELL LP | 1920938 | 6.62M | 9.74M | Mar 31, 2025 |
| 10 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 6.61M | 27.82M | Jun 30, 2026 |
| 11 | AQR CAPITAL MANAGEMENT LLC | 1167557 | 6.47M | 27.22M | Jun 30, 2026 |
| 12 | ACADIAN ASSET MANAGEMENT LLC | 916542 | 5.85M | 24.62K | Jun 30, 2026 |
| 13 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 5.51M | 23.21M | Jun 30, 2026 |
| 14 | KYNAM CAPITAL MANAGEMENT, LP | 1907884 | 5.47M | 7.16M | Sep 30, 2025 |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 4.83M | 20.35M | Jun 30, 2026 |
| 16 | TWO SIGMA INVESTMENTS, LP | 1179392 | 4.56M | 19.18M | Jun 30, 2026 |
| 17 | MARSHALL WACE, LLP | 1318757 | 4.29M | 18.06M | Jun 30, 2026 |
| 18 | JACOBS LEVY EQUITY MANAGEMENT, INC | 884414 | 4.07M | 17.12M | Jun 30, 2026 |
| 19 | GOLDMAN SACHS GROUP INC | 886982 | 3.31M | 13.95M | Jun 30, 2026 |
| 20 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 884546 | 3.30M | 13.90M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.