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IRWD

Ironwood Pharmaceuticals Inc
$4.00 +0.02 (+0.50%) At close · Jul 15
Market Cap
$637.05M
Shares
164,613,406

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 224
Total Value: $584,087,678
Total Shares: 166,208,629
Showing 1–100 of 233 holdings by value · page 1 of 3

Institutional Ownership Trend

26 quarters

Superinvestors Holding IRWD

All superinvestors →
Joel Greenblatt $37,406

Holder Concentration

Across 225 13F filers
Top Holder
9.0%
Jun 2023 → Mar 2026 · range 9.0% – 15.6%
of institutional value
Top 5
35.0%
Jun 2023 → Mar 2026 · range 35.0% – 49.2%
of institutional value
Top 10
56.5%
Jun 2023 → Mar 2026 · range 56.5% – 69.3%
of institutional value
HHI
411
Jun 2023 → Mar 2026 · range 411 – 631
Broadly held
Showing 100 of 233
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mid ARMISTICE CAPITAL, LLC $52,748,280 9.03% 15,028,000
Mega BlackRock, Inc. $46,903,878 8.03% 13,362,930
Mega UBS Group AG $39,313,123 6.73% 11,200,320
Small Sarissa Capital Management LP $32,252,108 5.52% 9,188,635
Mega BANK OF AMERICA CORP /DE/ Bank $30,477,003 5.22% 8,682,907
Large RENAISSANCE TECHNOLOGIES LLC $28,294,366 4.84% 8,061,073
Mega AQR CAPITAL MANAGEMENT LLC $26,448,126 4.53% 7,535,080
Mega STATE STREET CORP $26,173,873 4.48% 7,456,944
Large ACADIAN ASSET MANAGEMENT LLC $23,086,224 3.95% 6,577,272
Mega VANGUARD CAPITAL MANAGEMENT LLC $21,402,063 3.66% 6,097,454
Mega TWO SIGMA INVESTMENTS, LP $20,527,448 3.51% 5,848,276
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $16,629,878 2.85% 4,737,857
Mega GEODE CAPITAL MANAGEMENT, LLC $15,947,761 2.73% 4,543,522
Large MARSHALL WACE, LLP $15,882,974 2.72% 4,525,064
Large JACOBS LEVY EQUITY MANAGEMENT, INC $12,749,994 2.18% 3,632,477
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP $11,924,319 2.04% 3,397,242
Large FEDERATED HERMES, INC. $11,754,308 2.01% 3,348,806
Mega GOLDMAN SACHS GROUP INC $9,444,125 1.62% 2,690,634
Mega DIMENSIONAL FUND ADVISORS LP $7,308,012 1.25% 2,082,055
Large Connor, Clark & Lunn Investment Management Ltd. $6,442,338 1.10% 1,835,424
Large Qube Research & Technologies Ltd $5,581,184 0.96% 1,590,081
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $5,167,271 0.88% 1,472,157
Mega NORTHERN TRUST CORP Bank $4,443,104 0.76% 1,265,842
Mid Hillsdale Investment Management Inc. $4,340,564 0.74% 1,236,628
Large Pacer Advisors, Inc. $3,982,137 0.68% 1,134,512
Mega DEUTSCHE BANK AG\ Bank $3,948,710 0.68% 1,124,989
Mega VANGUARD FIDUCIARY TRUST CO Bank $3,470,091 0.59% 988,630
Mega UBS Group AG $3,275,619 0.56% 933,225
Mega MORGAN STANLEY $2,895,112 0.50% 824,819
Mega FMR LLC $2,774,254 0.47% 790,386
Mega RAYMOND JAMES FINANCIAL INC $2,681,480 0.46% 763,955
Mega FRANKLIN RESOURCES INC $2,613,677 0.45% 744,638
Large IEQ CAPITAL, LLC $2,606,957 0.45% 742,723
Large SEI INVESTMENTS CO $2,606,343 0.45% 742,548
Mega VICTORY CAPITAL MANAGEMENT INC $2,503,286 0.43% 713,187
Mid GSA CAPITAL PARTNERS LLP $2,297,101 0.39% 654,445
Mega JANE STREET GROUP, LLC $2,184,086 0.37% 622,247
Large STATE OF WISCONSIN INVESTMENT BOARD $2,099,538 0.36% 598,159
Mega Vanguard Global Advisers, LLC $2,076,126 0.36% 591,489
Large MACKENZIE FINANCIAL CORP $1,965,719 0.34% 560,034
Small Integrated Quantitative Investments LLC $1,937,885 0.33% 552,104
Mega Invesco Ltd. $1,921,231 0.33% 547,360
Large Man Group plc $1,898,432 0.33% 540,864
Mid WEDGE CAPITAL MANAGEMENT L L P/NC $1,834,086 0.31% 435,650
Small Inspire Investing, LLC $1,789,892 0.31% 509,941
Large LOS ANGELES CAPITAL MANAGEMENT LLC $1,787,456 0.31% 509,247
Mega Bank of New York Mellon Corp Bank $1,698,966 0.29% 484,036
Mega MILLENNIUM MANAGEMENT LLC $1,604,470 0.27% 457,114
Mega WELLINGTON MANAGEMENT GROUP LLP $1,591,836 0.27% 453,515
Large PRUDENTIAL FINANCIAL INC $1,578,934 0.27% 449,839
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $1,546,130 0.26% 440,493
Mega Amundi $1,418,871 0.24% 404,237
Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. $1,317,260 0.23% 375,288
Large Cerity Partners LLC $1,292,977 0.22% 368,370
Small CM Management, LLC $1,228,500 0.21% 350,000
Mid CWA Asset Management Group, LLC $1,222,440 0.21% 290,366
Large Robeco Institutional Asset Management B.V. $1,203,922 0.21% 342,998
Large LSV ASSET MANAGEMENT $1,082,031 0.19% 308,271
Large Tidal Investments LLC $1,068,707 0.18% 304,475
Large LAZARD ASSET MANAGEMENT LLC $1,018,563 0.17% 290,189
Large CWM, LLC $976,541 0.17% 278,217
Mid SEGALL BRYANT & HAMILL, LLC $976,485 0.17% 278,201
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $932,958 0.16% 265,800
Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $923,863 0.16% 219,445
Large Russell Investments Group, Ltd. $918,877 0.16% 261,789
Small GLOBEFLEX CAPITAL L P $911,929 0.16% 259,809
Small Harvest Investment Services, LLC $849,002 0.15% 241,881
Mid WINTON GROUP Ltd $848,528 0.15% 241,746
Mega Nuveen, LLC $819,275 0.14% 233,412
Large OMERS ADMINISTRATION Corp $794,348 0.14% 226,310
Large Walleye Capital LLC $790,227 0.14% 225,136
Large Rafferty Asset Management, LLC $760,346 0.13% 216,623
Large Mariner, LLC $729,304 0.12% 207,779
Mid MARTINGALE ASSET MANAGEMENT L P $719,518 0.12% 204,991
Mega RHUMBLINE ADVISERS $677,198 0.12% 192,934
Large Vident Advisory, LLC $647,022 0.11% 184,337
Large Creative Planning $623,095 0.11% 177,520
Large KLP KAPITALFORVALTNING AS $611,442 0.10% 174,200
Mega ALLIANCEBERNSTEIN L.P. $581,922 0.10% 165,790
Large FIFTH THIRD BANCORP Bank $579,479 0.10% 165,094
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $571,428 0.10% 162,800
Mid Legato Capital Management LLC $547,767 0.09% 156,059
Large VOYA INVESTMENT MANAGEMENT LLC $511,823 0.09% 145,819
Mega CANADA PENSION PLAN INVESTMENT BOARD Pension $473,850 0.08% 135,000
Large Quantinno Capital Management LP $455,257 0.08% 129,703
Large O'SHAUGHNESSY ASSET MANAGEMENT, LLC $450,132 0.08% 128,243
Small State of Wyoming $449,894 0.08% 128,175
Mega PRICE T ROWE ASSOCIATES INC /MD/ $436,342 0.07% 124,314
Mega CITADEL ADVISORS LLC $415,148 0.07% 118,276
Mega JPMORGAN CHASE & CO $414,849 0.07% 118,191
Large MERCER GLOBAL ADVISORS INC /ADV $403,930 0.07% 115,080
Large SG Americas Securities, LLC Broker-Dealer $398,841 0.07% 113,630
Mega CITADEL ADVISORS LLC $383,292 0.07% 109,200
Mid Cercano Management LLC $355,836 0.06% 101,378
Mega AMERIPRISE FINANCIAL INC $348,686 0.06% 99,341
Large STRS OHIO $341,874 0.06% 97,400
Mid PROFUND ADVISORS LLC $341,456 0.06% 97,281
Small Optimist Retirement Group LLC Pension $332,856 0.06% 94,831
Large FULLER & THALER ASSET MANAGEMENT, INC. $319,694 0.05% 91,081
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $316,282 0.05% 90,109
Key facts CIK 1446847 CUSIP 46333X108 13F (30d) 12 filings 12 filers Visit website Investor relations

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