IRWD Ironwood Pharmaceuticals, Inc.
Ironwood Pharmaceuticals, Inc. (IRWD) Institutional Ownership
What the institutions did with IRWD last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 17.8M | 11.1% |
| ARMISTICE CAPITAL, LLC | 13.9M | 8.7% |
| Sarissa Capital Management LP | 9.2M | 5.7% |
| STATE STREET CORP | 8.8M | 5.5% |
| BANK OF AMERICA CORP /DE/ | 8.7M | 5.4% |
| RENAISSANCE TECHNOLOGIES LLC | 8.0M | 5.0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 6.6M | 4.1% |
| AQR CAPITAL MANAGEMENT LLC | 6.5M | 4.0% |
| ACADIAN ASSET MANAGEMENT LLC | 5.9M | 3.6% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.5M | 3.4% |
| GEODE CAPITAL MANAGEMENT, LLC | 4.8M | 3.0% |
| TWO SIGMA INVESTMENTS, LP | 4.6M | 2.8% |
| MARSHALL WACE, LLP | 4.3M | 2.7% |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 4.1M | 2.5% |
| GOLDMAN SACHS GROUP INC | 3.3M | 2.1% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 3.3M | 2.1% |
| FEDERATED HERMES, INC. | 3.2M | 2.0% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 3.0M | 1.9% |
| DIMENSIONAL FUND ADVISORS LP | 2.5M | 1.6% |
| MACKENZIE FINANCIAL CORP | 2.4M | 1.5% |
| MORGAN STANLEY | 1.9M | 1.2% |
| Connor, Clark & Lunn Investment Management Ltd. | 1.8M | 1.1% |
| NORTHERN TRUST CORP | 1.4M | 0.9% |
| Hillsdale Investment Management Inc. | 1.3M | 0.8% |
| WELLS FARGO & COMPANY/MN | 1.2M | 0.8% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| BlackRock, Inc. | Increased | 13.4M | 17.8M | +4.4M |
| MACKENZIE FINANCIAL CORP | Increased | 560.0K | 2.4M | +1.8M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Reduced | 4.7M | 3.3M | -1.4M |
| STATE STREET CORP | Increased | 7.5M | 8.8M | +1.4M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | 1.5M | 129.2K | -1.3M |
| TWO SIGMA INVESTMENTS, LP | Reduced | 5.8M | 4.6M | -1.3M |
| Qube Research & Technologies Ltd | Reduced | 1.6M | 348.0K | -1.2M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 6.7M | 5.5M | -1.2M |
| WELLS FARGO & COMPANY/MN | Increased | 58.9K | 1.2M | +1.1M |
| ARMISTICE CAPITAL, LLC | Reduced | 15.0M | 13.9M | -1.1M |
| AQR CAPITAL MANAGEMENT LLC | Reduced | 7.5M | 6.5M | -1.1M |
| MORGAN STANLEY | Increased | 824.8K | 1.9M | +1.0M |
| ACADIAN ASSET MANAGEMENT LLC | Reduced | 6.6M | 5.9M | -723.9K |
| GOLDMAN SACHS GROUP INC | Increased | 2.7M | 3.3M | +623.2K |
| HRT FINANCIAL LP | New | 0 | 577.3K | +577.3K |
| UBS Group AG | Reduced | 933.2K | 389.5K | -543.7K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 6.1M | 6.6M | +511.1K |
| JANE STREET GROUP, LLC | Reduced | 622.2K | 129.7K | -492.5K |
| Integrated Quantitative Investments LLC | Reduced | 552.1K | 93.7K | -458.4K |
| MILLENNIUM MANAGEMENT LLC | Sold Out | 457.1K | 0 | -457.1K |
| DIMENSIONAL FUND ADVISORS LP | Increased | 2.1M | 2.5M | +440.8K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | Increased | 3.6M | 4.1M | +433.5K |
| Range Financial Group LLC | Reduced | 433.3K | 12.9K | -420.4K |
| GSA CAPITAL PARTNERS LLP | Reduced | 654.4K | 259.5K | -394.9K |
| CITADEL ADVISORS LLC | Increased | 118.3K | 502.4K | +384.1K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Reduced | 3.4M | 3.0M | -380.2K |
| Amundi | Reduced | 404.2K | 33.0K | -371.2K |
| VOYA INVESTMENT MANAGEMENT LLC | Increased | 145.8K | 484.5K | +338.6K |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC | Increased | 128.2K | 438.9K | +310.7K |
| Tidal Investments LLC | Sold Out | 304.5K | 0 | -304.5K |
| CWA Asset Management Group, LLC | New | 0 | 290.4K | +290.4K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 4.5M | 4.8M | +288.1K |
| SEI INVESTMENTS CO | Reduced | 742.5K | 459.4K | -283.1K |
| RITHOLTZ WEALTH MANAGEMENT | Increased | 87.5K | 360.1K | +272.6K |
| LAZARD ASSET MANAGEMENT LLC | Reduced | 290.2K | 27.6K | -262.5K |
| FRANKLIN RESOURCES INC | Increased | 744.6K | 1.0M | +262.3K |
| Virtus Investment Advisers, LLC | Increased | 76.2K | 318.6K | +242.4K |
| Harvest Investment Services, LLC | Sold Out | 241.9K | 0 | -241.9K |
| MARSHALL WACE, LLP | Reduced | 4.5M | 4.3M | -235.0K |
| Walleye Capital LLC | Reduced | 225.1K | 1 | -225.1K |
| CITIGROUP INC | Increased | 39.4K | 226.8K | +187.4K |
| Hennion & Walsh Asset Management, Inc. | Sold Out | 184.5K | 0 | -184.5K |
| IEQ CAPITAL, LLC | Reduced | 742.7K | 561.6K | -181.1K |
| STATE OF WISCONSIN INVESTMENT BOARD | Increased | 598.2K | 778.5K | +180.4K |
| EVOLVE PRIVATE WEALTH, LLC | Increased | 15.5K | 186.9K | +171.4K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Reduced | 509.2K | 342.3K | -167.0K |
| Cerity Partners LLC | Reduced | 368.4K | 208.0K | -160.4K |
| WINTON GROUP Ltd | Reduced | 241.7K | 84.2K | -157.6K |
| Legato Capital Management LLC | Sold Out | 156.1K | 0 | -156.1K |
| Man Group plc | Reduced | 540.9K | 392.1K | -148.7K |
| Invesco Ltd. | Reduced | 547.4K | 403.2K | -144.2K |
| SEGALL BRYANT & HAMILL, LLC | Increased | 278.2K | 408.1K | +129.9K |
| Arax Advisory Partners | Increased | 1.7K | 127.0K | +125.3K |
| Nuveen, LLC | Increased | 233.4K | 355.4K | +122.0K |
| Inspire Investing, LLC | Increased | 509.9K | 630.1K | +120.1K |
| FMR LLC | Increased | 790.4K | 909.5K | +119.1K |
| FEDERATED HERMES, INC. | Reduced | 3.3M | 3.2M | -117.6K |
| NORTHERN TRUST CORP | Increased | 1.3M | 1.4M | +108.1K |
| WEDGE CAPITAL MANAGEMENT L L P/NC | Reduced | 540.5K | 435.7K | -104.8K |
| STRS OHIO | Sold Out | 97.4K | 0 | -97.4K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.