Ironwood PharmaceuticalsIRWD
13F holders, Q3 2025 (September 30)166holders +11
29new positions
18sold out
7famous investors
$1.31avg. 13F price*
At the end of Q3 2025, 166 institutions reported holding Ironwood Pharmaceuticals Inc. (IRWD) in their 13F filings, up 11 from Q2 2025. 29 opened new positions and 18 sold out. The largest holders were Armistice Capital, LLC ($21.2M), Vanguard Group Inc. ($21.1M) and Sarissa Capital Management LP ($20.9M). 7 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Cliff Asness (0.0% of AQR Capital Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Ironwood Pharmaceuticals Inc.
- CUSIP
- 46333X108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 29 | $1.5M |
| Exits | 18 | $3.8M |
All 13F filers, Q2 2025 → Q3 2025: 14,214,324 shares bought and 11,764,064 shares sold, net +2,450,260 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 166 holders
| Armistice Capital, LLC | 0.67% | No change | 16,150,000 | $21.2M |
| Vanguard Group Inc. | 0.00% | Reduce -0.8% | 16,072,006 | $21.1M |
| Sarissa Capital Management LP | 11.56% | No change | 15,919,435 | $20.9M |
| BlackRock, Inc. | 0.00% | Add +0.3% | 12,062,558 | $15.8M |
| Bank of America Corp. | 0.00% | Add +248.3% | 11,695,544 | $15.3M |
| Renaissance Technologies | 0.01% | Reduce -0.6% | 8,352,173 | $10.9M |
| Acadian Asset Management LLC | 0.01% | Reduce -0.7% | 6,502,493 | $8.5M |
| Kynam Capital Management, LP | 0.53% | No change | 5,466,825 | $7.2M |
| AQR Capital Management | 0.00% | Reduce -12.8% | 5,378,535 | $7.0M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +34.2% | 4,917,336 | $6.4M |
| Geode Capital Management, LLC | 0.00% | Add +3.3% | 3,614,987 | $4.7M |
| Two Sigma Advisers, LP | 0.01% | Reduce -2.0% | 3,316,500 | $4.3M |
| State Street Corp. | 0.00% | Add +1.6% | 3,156,307 | $4.1M |
| Marshall Wace, LLP | 0.00% | Reduce -21.3% | 3,144,139 | $4.1M |
| Qube Research & Technologies Ltd | 0.01% | Reduce -16.2% | 2,806,910 | $3.7M |
| Two Sigma Investments, LP | 0.01% | Reduce -7.9% | 2,534,511 | $3.3M |
| Jane Street Group, LLC | 0.00% | Add +33.0% | 2,321,095 | $3.0M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | Reduce -2.0% | 2,161,818 | $2.8M |
| Federated Hermes, Inc. | 0.01% | Reduce -0.9% | 2,157,104 | $2.8M |
| Jacobs Levy Equity Management, Inc. | 0.01% | Add +30.2% | 1,920,530 | $2.5M |
| Deutsche Bank AG | 0.00% | Add +0.3% | 1,527,229 | $2.0M |
| Northern Trust Corp. | 0.00% | Add +2.7% | 1,340,906 | $1.8M |
| Los Angeles Capital Management LLC | 0.01% | Reduce -6.7% | 1,130,052 | $1.5M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -24.9% | 1,084,367 | $1.4M |
| UBS Group AG | 0.00% | Add +170.5% | 811,664 | $1.1M |
| Sei Investments Co. | 0.00% | No change | 683,604 | $896K |
| Ieq Capital, LLC | 0.00% | Add +34.5% | 661,698 | $867K |
| Citadel Advisors | 0.00% | Add +108.3% | 644,046 | $844K |
| FMR LLC | 0.00% | Add +12.6% | 559,946 | $734K |
| Highbridge Capital Management LLC | 0.10% | New | 537,252 | $704K |
| Bank of New York Mellon Corp | 0.00% | Add +3.3% | 503,078 | $659K |
| Morgan Stanley | 0.00% | Reduce -3.4% | 477,100 | $625K |
| D. E. Shaw & Co. | 0.00% | Reduce -77.7% | 372,270 | $488K |
| Invesco Ltd. | 0.00% | Add +13.8% | 366,532 | $480K |
| State of Wyoming | 0.05% | Add +76.2% | 362,407 | $475K |
| Robeco Institutional Asset Management B.V. | 0.00% | Reduce -7.4% | 342,998 | $449K |
| Cerity Partners LLC | 0.00% | Reduce -0.2% | 339,048 | $444K |
| Russell Investments Group, Ltd. | 0.00% | Add +56.4% | 326,567 | $429K |
| Gsa Capital Partners LLP | 0.03% | Reduce -57.1% | 309,529 | $405K |
| Royce & Associates LP | 0.00% | Reduce -40.6% | 300,619 | $394K |
| Barclays PLC | 0.00% | Reduce -18.6% | 297,318 | $389K |
| Tidal Investments LLC | 0.00% | Reduce -5.1% | 294,236 | $385K |
| Millennium Management | 0.00% | Add +159.6% | 250,119 | $328K |
| Cwm, LLC | 0.00% | Add +27.4% | 232,790 | $305K |
| Rhumbline Advisers | 0.00% | Add +3.5% | 223,229 | $292K |
| OMERS ADMINISTRATION Corp | 0.00% | No change | 215,110 | $282K |
| Alliancebernstein L.P. | 0.00% | No change | 199,520 | $261K |
| Exchange Traded Concepts, LLC | 0.00% | Reduce -42.7% | 195,732 | $256K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | Add +23.1% | 154,388 | $235K |
| KLP Kapitalforvaltning As | 0.00% | No change | 174,200 | $228K |
| Hennion & Walsh Asset Management, Inc. | 0.01% | Reduce -1.8% | 169,493 | $222K |
| Panagora Asset Management Inc. | 0.00% | Add +241.3% | 158,962 | $208K |
| Bridgeway Capital Management, LLC | 0.00% | Add +100.0% | 150,000 | $197K |
| Arax Advisory Partners | 0.00% | New | 143,392 | $188K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.00% | Reduce -76.3% | 124,875 | $164K |
| Algert Global LLC | 0.00% | No change | 122,580 | $161K |
| Ameriprise Financial Inc. | 0.00% | Add +149.3% | 119,969 | $157K |
| JPMorgan Chase & Co. | 0.00% | Reduce -1.0% | 112,157 | $147K |
| Siren, L.L.C. | 0.01% | No change | 110,532 | $145K |
| Engineers Gate Manager LP | 0.00% | Add +39.1% | 102,014 | $134K |
| Cercano Management LLC | 0.01% | No change | 101,378 | $133K |
| Mariner, LLC | 0.00% | Reduce -37.3% | 101,313 | $133K |
| Wells Fargo & Company | 0.00% | Add +15.7% | 101,252 | $133K |
| Susquehanna International Group, LLP | 0.00% | Reduce -63.6% | 96,866 | $127K |
| Dimensional Fund Advisors LP | 0.00% | No change | 90,373 | $118K |
| Creative Planning | 0.00% | Reduce -3.8% | 90,156 | $118K |
| Pallas Capital Advisors LLC | 0.00% | Add +10.1% | 87,569 | $115K |
| Focus Partners Advisor Solutions, LLC | 0.00% | Add +31.6% | 52,295 | $113K |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -53.5% | 80,178 | $106K |
| Tudor Investment Corporation | 0.00% | No change | 79,455 | $104K |
| STRS Ohio | 0.00% | No change | 76,600 | $100K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Reduce -16.5% | 72,971 | $96K |
| Vanguard Personalized Indexing Management, LLC | 0.00% | Add +43.5% | 72,706 | $95K |
| Intech Investment Management LLC | 0.00% | Reduce -17.8% | 72,194 | $95K |
| Mercer Global Advisors Inc. | 0.00% | Add +113.5% | 71,353 | $93K |
| Captrust Financial Advisors | 0.00% | Add +42.1% | 63,154 | $83K |
| Public Employees Retirement System of Ohio | 0.00% | Add +351.2% | 60,768 | $80K |
| MetLife Investment Management, LLC | 0.00% | New | 58,009 | $76K |
| Cubist Systematic Strategies, LLC | 0.00% | New | 53,995 | $71K |
| Manufacturers Life Insurance Company, The | 0.00% | New | 53,942 | $71K |
| Prudential Financial Inc. | 0.00% | Add +142.0% | 49,935 | $65K |
| Merit Financial Group, LLC | 0.00% | Add +17.4% | 48,879 | $64K |
| Krilogy Financial LLC | 0.00% | New | 30,208 | $62K |
| Focus Partners Wealth | 0.00% | Add +29.3% | 44,652 | $58K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | Add +50.5% | 44,115 | $58K |
| New York State Common Retirement Fund | 0.00% | No change | 41,869 | $55K |
| GRIMES & Co WEALTH MANAGEMENT, LLC | 0.00% | No change | 40,994 | $54K |
| HRT Financial LP | 0.00% | New | 39,844 | $52K |
| SG Americas Securities, LLC | 0.00% | New | 36,952 | $48K |
| Capstone Investment Advisors, LLC | 0.00% | No change | 36,268 | $48K |
| BNP Paribas Financial Markets | 0.00% | Add +83.2% | 34,331 | $45K |
| ProShare Advisors LLC | 0.00% | Reduce -14.7% | 33,145 | $43K |
| Brighton Jones LLC | 0.00% | Add +8.7% | 33,071 | $43K |
| Requisite Capital Management, LLC | 0.01% | New | 31,748 | $42K |
| Ariadne Wealth Management, LP | 0.02% | Reduce -5.0% | 12,241 | $41K |
| Vise Technologies, Inc. | 0.00% | New | 29,632 | $39K |
| Voya Investment Management LLC | 0.00% | Reduce -36.3% | 29,367 | $38K |
| China Universal Asset Management Co., Ltd. | 0.00% | Reduce -12.4% | 28,472 | $37K |
| Franklin Resources Inc. | 0.00% | No change | 23,251 | $30K |
| Essential Partners LLC | 0.01% | Add +51.7% | 21,928 | $29K |
"% of holder's portfolio" is IRWD's weight in each manager's 13F, not the share of Ironwood Pharmaceuticals Inc. the manager owns.