BOSTON, MA
IRONWOOD PHARMACEUTICALS INCIRWD— Latest position per institution from SEC 13F filings
15
Institutional holders
175.02M
Total shares held
632.34M
Estimated value
8.75M
Avg. position size
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
22.88M
Value
149.16M
Filed
Jun 30, 2024
VANGUARD GROUP INC
CIK 102909
Shares
15.96M
Value
53.78M
Filed
Dec 31, 2025
ARMISTICE CAPITAL, LLC
CIK 1601086
Shares
15.03M
Value
52.75M
Filed
Mar 31, 2026
BLACKROCK, INC.
CIK 2012383
Shares
13.36M
Value
46.90M
Filed
Mar 31, 2026
UBS GROUP AG
CIK 1610520
Shares
12.13M
Value
42.59M
Filed
Mar 31, 2026
SARISSA CAPITAL MANAGEMENT LP
CIK 1577524
Shares
9.19M
Value
32.25M
Filed
Mar 31, 2026
BANK OF AMERICA CORP /DE/
CIK 70858
Shares
8.68M
Value
30.48M
Filed
Mar 31, 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 1037389
Shares
8.06M
Value
28.29M
Filed
Mar 31, 2026
AQR CAPITAL MANAGEMENT LLC
CIK 1167557
Shares
7.54M
Value
26.45M
Filed
Mar 31, 2026
STATE STREET CORP
CIK 93751
Shares
7.46M
Value
26.17M
Filed
Mar 31, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
6.68M
Value
23.45M
Filed
Mar 31, 2026
BRAIDWELL LP
CIK 1920938
Shares
6.62M
Value
9.74M
Filed
Mar 31, 2025
ACADIAN ASSET MANAGEMENT LLC
CIK 916542
Shares
6.58M
Value
23.07K
Filed
Mar 31, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
6.10M
Value
21.40M
Filed
Mar 31, 2026
TWO SIGMA INVESTMENTS, LP
CIK 1179392
Shares
5.85M
Value
20.53M
Filed
Mar 31, 2026
KYNAM CAPITAL MANAGEMENT, LP
CIK 1907884
Shares
5.47M
Value
7.16M
Filed
Sep 30, 2025
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 884546
Shares
4.74M
Value
16.63M
Filed
Mar 31, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
4.54M
Value
15.95M
Filed
Mar 31, 2026
MARSHALL WACE, LLP
CIK 1318757
Shares
4.53M
Value
15.88M
Filed
Mar 31, 2026
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 884414
Shares
3.63M
Value
12.75M
Filed
Mar 31, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | BLACKROCK FINANCE, INC. | 1364742 | 22.88M | 149.16M | Jun 30, 2024 |
| 2 | VANGUARD GROUP INC | 102909 | 15.96M | 53.78M | Dec 31, 2025 |
| 3 | ARMISTICE CAPITAL, LLC | 1601086 | 15.03M | 52.75M | Mar 31, 2026 |
| 4 | BLACKROCK, INC. | 2012383 | 13.36M | 46.90M | Mar 31, 2026 |
| 5 | UBS GROUP AG | 1610520 | 12.13M | 42.59M | Mar 31, 2026 |
| 6 | SARISSA CAPITAL MANAGEMENT LP | 1577524 | 9.19M | 32.25M | Mar 31, 2026 |
| 7 | BANK OF AMERICA CORP /DE/ | 70858 | 8.68M | 30.48M | Mar 31, 2026 |
| 8 | RENAISSANCE TECHNOLOGIES LLC | 1037389 | 8.06M | 28.29M | Mar 31, 2026 |
| 9 | AQR CAPITAL MANAGEMENT LLC | 1167557 | 7.54M | 26.45M | Mar 31, 2026 |
| 10 | STATE STREET CORP | 93751 | 7.46M | 26.17M | Mar 31, 2026 |
| 11 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 6.68M | 23.45M | Mar 31, 2026 |
| 12 | BRAIDWELL LP | 1920938 | 6.62M | 9.74M | Mar 31, 2025 |
| 13 | ACADIAN ASSET MANAGEMENT LLC | 916542 | 6.58M | 23.07K | Mar 31, 2026 |
| 14 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 6.10M | 21.40M | Mar 31, 2026 |
| 15 | TWO SIGMA INVESTMENTS, LP | 1179392 | 5.85M | 20.53M | Mar 31, 2026 |
| 16 | KYNAM CAPITAL MANAGEMENT, LP | 1907884 | 5.47M | 7.16M | Sep 30, 2025 |
| 17 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 884546 | 4.74M | 16.63M | Mar 31, 2026 |
| 18 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 4.54M | 15.95M | Mar 31, 2026 |
| 19 | MARSHALL WACE, LLP | 1318757 | 4.53M | 15.88M | Mar 31, 2026 |
| 20 | JACOBS LEVY EQUITY MANAGEMENT, INC | 884414 | 3.63M | 12.75M | Mar 31, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.