Ironwood Pharmaceuticals, Inc. has 14 Schedule 13D or 13G filings on record since 2025-07-07. 5 holders' latest filing reports 5% or more of class a common stock, $0.001 par value. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Armistice Capital, LLC | 8.43% | 13,932,000 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| BlackRock, Inc. | 8.1% | 13,373,568 | SCHEDULE 13G/A, 2026-07-28 | 2026-06-30 |
| Bank Of America Corp | 6.1% | 9,962,355 | SCHEDULE 13G/A, 2026-04-27 | 2026-03-31 |
| Sarissa Capital Management LP | 5.8% | 9,188,635 | SCHEDULE 13D/A, 2026-03-19 | 2026-03-17 |
| State Street Corporation | 5.4% | 8,809,601 | SCHEDULE 13G, 2026-08-07 | 2026-06-30 |
| Renaissance Technologies LLC | 4.9% | 8,061,073 | SCHEDULE 13G/A, 2026-05-14 | 2026-03-31 |
| Barclays PLC | 1.95% | 3,167,713 | SCHEDULE 13G/A, 2025-11-12 | 2025-09-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-07 | The Vanguard Group | 10.01% | SCHEDULE 13G/A |
| 2025-08-12 | Barclays PLC | 6.88% | SCHEDULE 13G |
| 2025-08-15 | Armistice Capital, LLC | 9.94% | SCHEDULE 13G/A |
| 2025-11-12 | Barclays PLC | 1.95% | SCHEDULE 13G/A |
| 2025-11-14 | Bank Of America Corp | 7.4% | SCHEDULE 13G |
| 2026-02-17 | Armistice Capital, LLC | 9.85% | SCHEDULE 13G/A |
| 2026-03-19 | Sarissa Capital Management LP | 5.8% | SCHEDULE 13D/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-27 | Bank Of America Corp | 6.1% | SCHEDULE 13G/A |
| 2026-05-14 | Renaissance Technologies LLC | 4.9% | SCHEDULE 13G/A |
| 2026-05-15 | Armistice Capital, LLC | 9.22% | SCHEDULE 13G/A |
| 2026-07-28 | BlackRock, Inc. | 8.1% | SCHEDULE 13G/A |
| 2026-08-07 | State Street Corporation | 5.4% | SCHEDULE 13G |
| 2026-08-14 | Armistice Capital, LLC | 8.43% | SCHEDULE 13G/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.