Which hedge funds own IRWD? IRONWOOD PHARMACEUTICALS INC, Q2 2026 13F holders
21 tracked hedge funds disclosed a position in IRWD (IRONWOOD PHARMACEUTICALS INC) in their Q2 2026 13F filings, worth $221.4m in total. The largest holder by portfolio weight is Sarissa Capital Management LP at 21.7% of its book. 2 opened a new position this quarter: Prelude Capital Management, LLC, Quarry LP. 9 exited: EntryPoint Capital, LLC, Scientech Research LLC, MQS Management LLC.
- 21
- Holders Tracked managers whose filing for the quarter reports a long equity position in the security.
- 2
- New this quarter Holders whose previous filing (at most two quarters earlier) did not report the security.
- 9
- Exited this quarter Tracked managers whose previous filing reported the security and whose filing for the quarter does not.
- $78.6k
- Inflow, new holders Combined value of the positions the new holders reported for the quarter.
- $2.3m
- Outflow, exits Combined value the exiting managers reported for the security in their previous filing.
- $221m
- Combined value Sum of the holders' reported positions in the security.
- 1.7%
- Share of managers holding Holders as a share of tracked managers filing for that quarter. Comparable across the 2024 coverage expansion, where the raw holder count is not.
Holders, Q2 2026
| Sarissa Capital Management LP Hedge fund | 21.7% | 0.0% | held |
| Armistice Capital, LLC Hedge fund | 1.6% | −7.3% | reduced |
| CM Management, LLC Hedge fund | 0.9% | 0.0% | held |
| Hillsdale Investment Management Inc. Hedge fund | 0.1% | +1.1% | added |
| Gsa Capital Partners LLP Hedge fund | 0.07% | −60% | reduced |
| Cercano Management LLC Hedge fund | 0.06% | 0.0% | held |
| Renaissance Technologies LLC Hedge fund | 0.05% | −0.8% | reduced |
| Marshall Wace, LLP Hedge fund | 0.02% | −5.2% | reduced |
| Two Sigma Investments, LP Hedge fund | 0.01% | −22% | reduced |
| AQR Capital Management LLC Hedge fund | 0.01% | −14% | reduced |
| Prelude Capital Management, LLC Hedge fund | 0.01% | – | new |
| Arrowstreet Capital, Limited Partnership Hedge fund | 0.01% | −11% | reduced |
| Engineers Gate Manager LP Hedge fund | 0.01% | +23% | added |
| Qube Research & Technologies Ltd Hedge fund | 0.0% | −78% | reduced |
| Citadel Advisors LLC Hedge fund | 0.0% | +325% | added |
| Quantbot Technologies LP Hedge fund | 0.0% | +454% | added |
| Schonfeld Strategic Advisors LLC Hedge fund | 0.0% | −51% | reduced |
| Squarepoint Ops LLC Hedge fund | 0.0% | +104% | added |
| D. E. Shaw & Co., Inc. Hedge fund | 0.0% | +156% | added |
| Quarry LP Hedge fund | 0.0% | – | new |
| Walleye Capital LLC Hedge fund | 0.0% | −100% | reduced |
Exited since the previous filing
| EntryPoint Capital, LLC | 0.09% | $305k |
| Scientech Research LLC | 0.05% | $55.9k |
| MQS Management LLC | 0.03% | $40.2k |
| NINE MASTS CAPITAL Ltd | 0.01% | $47.5k |
| Graham Capital Management, L.P. | 0.0% | $108k |
| Millennium Management LLC | 0.0% | $1.6m |
| Y-Intercept (Hong Kong) Ltd | 0.0% | $47.3k |
| Brevan Howard Capital Management LP | 0.0% | $49.9k |
| Farallon Capital Management, L.L.C. | 0.0% | $45.6k |
Ownership over time
Who discovered IRWD first? Beta
The run: Q2 2025 → Q2 2026, +485%
| Bridger Management, LLC high conviction | Q3 2015 | – | +2.7 pts |
| Redmile Group, LLC | Q4 2015 | – | +0.9 pts |
| HighVista Strategies LLC | Q2 2019 | – | +0.5 pts |
| Lombard Odier Asset Management (USA) Corp | Q3 2015 | – | +0.1 pts |
| Orbimed Advisors LLC | Q2 2014 | – | +0.1 pts |
| Slate Path Capital LP | Q1 2020 | – | 0.0 pts |
| Sio Capital Management, LLC | Q2 2015 | 0.5% | −1.1 pts |
| Sarissa Capital Management LP high conviction | Q1 2019 | 7.4% | −7.8 pts |
Split-adjusted quarter-end prices, excluding dividends. They describe the stock while each manager held it, not the return it earned.