Who owns IRONWOOD PHARMACEUTICALS INC?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from SEC filings.
Institutional ownership of IRWD from SEC Form 13F filings across 156 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 156 institutions disclosed 104.5M shares of IRONWOOD PHARMACEUTICALS INC worth $411.5M — about 63.5% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.
156
13F holders
$411.5M
value, 2026 filers
63.5%
of shares outstanding (104.5M sh)
21
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of IRWD's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 17.8M | $74.9M | 0.0% | 10.8% | +33.1% |
| 2 | BANK OF AMERICA CORP /DE/ | 8.7M | $36.6M | 0.0% | 5.3% | 0.0% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 6.6M | $27.8M | 0.0% | 4% | -45.8% |
| 4 | ACADIAN ASSET MANAGEMENT LLC | 5.9M | $24,623 | 0.0% | 3.6% | -11.0% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 5.5M | $23.2M | 0.0% | 3.4% | -17.5% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 4.8M | $20.3M | 0.0% | 2.9% | +6.3% |
| 7 | TWO SIGMA INVESTMENTS, LP | 4.6M | $19.2M | 0.0% | 2.8% | -22.1% |
| 8 | MARSHALL WACE, LLP | 4.3M | $18.1M | 0.0% | 2.6% | -5.2% |
| 9 | GOLDMAN SACHS GROUP INC | 3.3M | $14.0M | 0.0% | 2% | +23.2% |
| 10 | Sixth Street Partners Management Company, L.P.NEW | 3.3M | $13.9M | 2.4% | 2% | new |
| 11 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 3.3M | $13.9M | 0.0% | 2% | -30.3% |
| 12 | FEDERATED HERMES, INC. | 3.2M | $13.6M | 0.0% | 2% | -3.5% |
| 13 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 3.0M | $12.7M | 0.0% | 1.8% | -11.2% |
| 14 | MACKENZIE FINANCIAL CORP | 2.4M | $10.0M | 0.0% | 1.4% | +322.7% |
| 15 | MORGAN STANLEY | 1.9M | $7.8M | 0.0% | 1.1% | +125.5% |
| 16 | Connor, Clark & Lunn Investment Management Ltd. | 1.8M | $7.6M | 0.0% | 1.1% | -1.3% |
| 17 | NORTHERN TRUST CORP | 1.4M | $5.8M | 0.0% | 0.8% | +8.5% |
| 18 | WELLS FARGO & COMPANY/MN | 1.2M | $5.1M | 0.0% | 0.7% | +1949.6% |
| 19 | DEUTSCHE BANK AG\ | 1.2M | $4.9M | 0.0% | 0.7% | +2.9% |
| 20 | VANGUARD FIDUCIARY TRUST CO | 1.0M | $4.4M | 0.0% | 0.6% | +5.2% |
| 21 | FRANKLIN RESOURCES INC | 1.0M | $4.2M | 0.0% | 0.6% | +35.2% |
| 22 | FMR LLC | 909,488 | $3.8M | 0.0% | 0.6% | +15.1% |
| 23 | STATE OF WISCONSIN INVESTMENT BOARD | 778,515 | $3.3M | 0.0% | 0.5% | +30.2% |
| 24 | RAYMOND JAMES FINANCIAL INC | 725,085 | $3.1M | 0.0% | 0.4% | -5.1% |
| 25 | RITHOLTZ WEALTH MANAGEMENT | 720,188 | $3.0M | 0.0% | 0.4% | +722.7% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.