IRWD · Ironwood Pharmaceuticals Inc
Market Cap
$705.57M
Shares
165.24M
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.
Holders: 212
Total Value: $679,179,240
Total Shares: 161,325,585
Showing 1–100
of 219 holdings by value
· page 1 of 3
Institutional Ownership Trend
26 quarters
Holder Concentration
Across 212 13F filers · Δ vs Mar 31, 2026Top Holder
11.0%
+2.4 pts
Top 5
36.2%
+2.5 pts
Top 10
56.3%
+1.7 pts
HHI
430
Broadly held+36
Quarterly Activity
vs Mar 31, 2026
New
24
Increased
73
Decreased
84
Sold Out
39
Unchanged
31
Holder count:
-15
Institutional value:
+11.6%
Shares held:
-7.0%
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega BlackRock, Inc. | +4,425,627 | 17,788,557 | |
| Large MACKENZIE FINANCIAL CORP | +1,807,459 | 2,367,493 | |
| Mega STATE STREET CORP | +1,352,657 | 8,809,601 | |
| Mega WELLS FARGO & COMPANY/MN | +1,147,348 | 1,206,198 | |
| Mega MORGAN STANLEY | +1,035,095 | 1,859,914 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega UBS Group AG | −11,744,016 | 389,529 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | −1,435,615 | 3,302,242 | |
| Mega TWO SIGMA INVESTMENTS, LP | −1,292,187 | 4,556,089 | |
| Mega Qube Research & Technologies Ltd | −1,242,096 | 347,985 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | −1,216,420 | 684,337 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Large HRT FINANCIAL LP | 577,337 | $2,430,588 | |
| Mid CWA Asset Management Group, LLC | 290,366 | $1,222,440 | |
| Mid Jump Financial, LLC | 39,964 | $168,248 | |
| Mega ENVESTNET ASSET MANAGEMENT INC | 35,531 | $149,585 | |
| Large TRUIST FINANCIAL CORP | 35,529 | $149,577 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega MILLENNIUM MANAGEMENT LLC | 457,114 | $1,604,470 | |
| Large Tidal Investments LLC | 304,475 | $1,068,707 | |
| Large CWM, LLC | 278,217 | $976,541 | |
| Small Harvest Investment Services, LLC | 241,881 | $849,002 | |
| Mid Hennion & Walsh Asset Management, Inc. | 184,485 | $647,542 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. | $74,889,820 | 11.03% | 17,788,557 | Shares | 2026-08-07 | |
| Mid ARMISTICE CAPITAL, LLC | $58,653,720 | 8.64% | 13,932,000 | Shares | 2026-08-14 | |
| Small Sarissa Capital Management LP | $38,684,153 | 5.70% | 9,188,635 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP | $37,088,420 | 5.46% | 8,809,601 | Shares | 2026-08-07 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $36,558,810 | 5.38% | 8,683,803 | Shares | 2026-08-14 | |
| Large RENAISSANCE TECHNOLOGIES LLC | $33,651,481 | 4.95% | 7,993,226 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $27,821,818 | 4.10% | 6,608,508 | Shares | 2026-08-13 | |
| Mega AQR CAPITAL MANAGEMENT LLC | $27,221,524 | 4.01% | 6,465,921 | Shares | 2026-08-14 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $24,642,523 | 3.63% | 5,853,331 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC | $23,211,224 | 3.42% | 5,513,355 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | $20,341,275 | 2.99% | 4,831,657 | Shares | 2026-08-12 | |
| Mega TWO SIGMA INVESTMENTS, LP | $19,181,134 | 2.82% | 4,556,089 | Shares | 2026-08-14 | |
| Large MARSHALL WACE, LLP | $18,061,290 | 2.66% | 4,290,093 | Shares | 2026-08-13 | |
| Large JACOBS LEVY EQUITY MANAGEMENT, INC | $17,117,708 | 2.52% | 4,065,964 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC | $13,951,131 | 2.05% | 3,313,808 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $13,902,438 | 2.05% | 3,302,242 | Shares | 2026-08-14 | |
| Large FEDERATED HERMES, INC. | $13,603,511 | 2.00% | 3,231,238 | Shares | 2026-08-12 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $12,701,944 | 1.87% | 3,017,089 | Shares | 2026-08-13 | |
| Mega DIMENSIONAL FUND ADVISORS LP | $10,621,369 | 1.56% | 2,522,891 | Shares | 2026-08-11 | |
| Large MACKENZIE FINANCIAL CORP | $9,967,145 | 1.47% | 2,367,493 | Shares | 2026-08-13 | |
| Mega MORGAN STANLEY | $7,830,234 | 1.15% | 1,859,914 | Shares | 2026-08-13 | |
| Large Connor, Clark & Lunn Investment Management Ltd. | $7,627,315 | 1.12% | 1,811,714 | Shares | 2026-08-13 | |
| Mega NORTHERN TRUST CORP Bank | $5,784,430 | 0.85% | 1,373,974 | Shares | 2026-08-13 | |
| Mid Hillsdale Investment Management Inc. | $5,264,301 | 0.78% | 1,250,428 | Shares | 2026-08-12 | |
| Mega WELLS FARGO & COMPANY/MN | $5,078,093 | 0.75% | 1,206,198 | Shares | 2026-08-14 | |
| Mega DEUTSCHE BANK AG\ Bank | $4,875,760 | 0.72% | 1,158,138 | Shares | 2026-08-07 | |
| Large Pacer Advisors, Inc. | $4,612,109 | 0.68% | 1,095,513 | Shares | 2026-08-13 | |
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $4,379,810 | 0.64% | 1,040,335 | Shares | 2026-08-13 | |
| Mega FRANKLIN RESOURCES INC | $4,239,379 | 0.62% | 1,006,979 | Shares | 2026-08-13 | |
| Mega FMR LLC | $3,828,944 | 0.56% | 909,488 | Shares | 2026-08-13 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD | $3,277,548 | 0.48% | 778,515 | Shares | 2026-08-14 | |
| Mega RAYMOND JAMES FINANCIAL INC | $3,052,607 | 0.45% | 725,085 | Shares | 2026-08-14 | |
| Mega VICTORY CAPITAL MANAGEMENT INC | $2,772,103 | 0.41% | 658,457 | Shares | 2026-08-07 | |
| Mid Inspire Investing, LLC | $2,652,603 | 0.39% | 630,072 | Shares | 2026-08-12 | |
| Large HRT FINANCIAL LP | $2,430,588 | 0.36% | 577,337 | Shares | 2026-08-14 | |
| Large IEQ CAPITAL, LLC | $2,364,285 | 0.35% | 561,588 | Shares | 2026-08-11 | |
| Mega Vanguard Global Advisers, LLC | $2,361,969 | 0.35% | 561,038 | Shares | 2026-08-13 | |
| Large PRUDENTIAL FINANCIAL INC | $2,261,607 | 0.33% | 537,199 | Shares | 2026-08-12 | |
| Mega Bank of New York Mellon Corp Bank | $2,142,383 | 0.32% | 508,880 | Shares | 2026-08-06 | |
| Mega CITADEL ADVISORS LLC | $2,115,116 | 0.31% | 502,403 | Shares | 2026-09-02 | |
| Large VOYA INVESTMENT MANAGEMENT LLC | $2,039,533 | 0.30% | 484,450 | Shares | 2026-08-12 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP | $1,973,734 | 0.29% | 468,821 | Shares | 2026-08-14 | |
| Large SEI INVESTMENTS CO | $1,934,144 | 0.28% | 459,417 | Shares | 2026-08-14 | |
| Large O'SHAUGHNESSY ASSET MANAGEMENT, LLC | $1,847,815 | 0.27% | 438,911 | Shares | 2026-08-13 | |
| Mid WEDGE CAPITAL MANAGEMENT L L P/NC | $1,834,086 | 0.27% | 435,650 | Shares | 2026-07-10 | |
| Mid SEGALL BRYANT & HAMILL, LLC | $1,717,949 | 0.25% | 408,064 | Shares | 2026-08-12 | |
| Mega Invesco Ltd. | $1,697,507 | 0.25% | 403,209 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $1,670,528 | 0.25% | 396,800 | Put | 2026-08-14 | |
| Large Man Group plc | $1,650,812 | 0.24% | 392,117 | Shares | 2026-08-14 | |
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | $1,641,028 | 0.24% | 389,793 | Shares | 2026-08-14 | |
| Mega UBS Group AG | $1,639,916 | 0.24% | 389,529 | Shares | 2026-08-13 | |
| Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. | $1,579,962 | 0.23% | 375,288 | Shares | 2026-08-13 | |
| Mid RITHOLTZ WEALTH MANAGEMENT | $1,515,995 | 0.22% | 360,094 | Shares | 2026-08-11 | |
| Mega Nuveen, LLC | $1,496,115 | 0.22% | 355,372 | Shares | 2026-08-11 | |
| Small CM Management, LLC | $1,473,500 | 0.22% | 350,000 | Shares | 2026-08-13 | |
| Mega Qube Research & Technologies Ltd | $1,465,016 | 0.22% | 347,985 | Shares | 2026-08-14 | |
| Large Robeco Institutional Asset Management B.V. | $1,444,021 | 0.21% | 342,998 | Shares | 2026-07-21 | |
| Large LOS ANGELES CAPITAL MANAGEMENT LLC | $1,441,053 | 0.21% | 342,293 | Shares | 2026-08-13 | |
| Small Virtus Investment Advisers, LLC | $1,341,297 | 0.20% | 318,598 | Shares | 2026-08-11 | |
| Large LSV ASSET MANAGEMENT | $1,297,820 | 0.19% | 308,271 | Shares | 2026-08-06 | |
| Mid CWA Asset Management Group, LLC | $1,222,440 | 0.18% | 290,366 | Shares | 2026-07-14 | |
| Small GLOBEFLEX CAPITAL L P | $1,093,795 | 0.16% | 259,809 | Shares | 2026-08-12 | |
| Mid GSA CAPITAL PARTNERS LLP | $1,092,545 | 0.16% | 259,512 | Shares | 2026-08-06 | |
| Mega CITIGROUP INC | $954,928 | 0.14% | 226,824 | Shares | 2026-08-03 | |
| Mega Russell Investments Group, Ltd. | $946,494 | 0.14% | 224,821 | Shares | 2026-08-06 | |
| Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $923,863 | 0.14% | 219,445 | Shares | 2026-07-15 | |
| Mega JPMORGAN CHASE & CO | $894,940 | 0.13% | 212,575 | Shares | 2026-08-12 | |
| Large Cerity Partners LLC | $875,759 | 0.13% | 208,019 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS | $863,449 | 0.13% | 205,095 | Shares | 2026-08-12 | |
| Mid MARTINGALE ASSET MANAGEMENT L P | $863,012 | 0.13% | 204,991 | Shares | 2026-08-13 | |
| Mid EVOLVE PRIVATE WEALTH, LLC | $786,697 | 0.12% | 186,864 | Shares | 2026-08-12 | |
| Large Vident Advisory, LLC | $761,711 | 0.11% | 180,929 | Shares | 2026-08-12 | |
| Large Creative Planning | $745,295 | 0.11% | 177,030 | Shares | 2026-08-13 | |
| Large KLP KAPITALFORVALTNING AS | $733,382 | 0.11% | 174,200 | Shares | 2026-08-12 | |
| Large Mariner, LLC | $709,267 | 0.10% | 168,472 | Shares | 2026-08-13 | |
| Mega ALLIANCEBERNSTEIN L.P. | $697,975 | 0.10% | 165,790 | Shares | 2026-08-14 | |
| Large OMERS ADMINISTRATION Corp | $669,432 | 0.10% | 159,010 | Shares | 2026-08-13 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $666,443 | 0.10% | 158,300 | Call | 2026-08-14 | |
| Large Rafferty Asset Management, LLC | $643,616 | 0.09% | 152,878 | Shares | 2026-08-14 | |
| Large Quantinno Capital Management LP | $634,042 | 0.09% | 150,604 | Shares | 2026-08-13 | |
| Large FIFTH THIRD BANCORP Bank | $558,869 | 0.08% | 132,748 | Shares | 2026-08-05 | |
| Mega CANADA PENSION PLAN INVESTMENT BOARD Pension | $551,089 | 0.08% | 130,900 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $546,036 | 0.08% | 129,700 | Shares | 2026-08-14 | |
| Mega SG Americas Securities, LLC Broker-Dealer | $544,268 | 0.08% | 129,280 | Shares | 2026-08-07 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $544,087 | 0.08% | 129,237 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ | $542,130 | 0.08% | 128,772 | Shares | 2026-08-14 | |
| Mid Arax Advisory Partners | $534,526 | 0.08% | 126,966 | Shares | 2026-08-10 | |
| Large MERCER GLOBAL ADVISORS INC /ADV | $531,133 | 0.08% | 126,160 | Shares | 2026-08-19 | |
| Mega HSBC HOLDINGS PLC | $530,881 | 0.08% | 126,100 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $517,438 | 0.08% | 122,907 | Shares | 2026-08-14 | |
| Small Optimist Retirement Group LLC Pension | $429,647 | 0.06% | 102,054 | Shares | 2026-08-10 | |
| Small State of Wyoming | $428,498 | 0.06% | 101,781 | Shares | 2026-08-06 | |
| Small Cercano Management LLC | $426,801 | 0.06% | 101,378 | Shares | 2026-08-14 | |
| Mega BARCLAYS PLC | $421,517 | 0.06% | 100,123 | Shares | 2026-08-14 | |
| Mega AMERIPRISE FINANCIAL INC | $419,004 | 0.06% | 99,526 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $413,843 | 0.06% | 98,300 | Put | 2026-09-02 | |
| Mid Engineers Gate Manager LP | $412,798 | 0.06% | 98,052 | Shares | 2026-08-14 | |
| Large MetLife Investment Management, LLC | $405,035 | 0.06% | 96,208 | Shares | 2026-08-14 | |
| Small Integrated Quantitative Investments LLC | $394,430 | 0.06% | 93,689 | Shares | 2026-08-14 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund | $392,333 | 0.06% | 93,191 | Shares | 2026-08-14 |
Key facts
CIK
1446847
CUSIP
46333X108
13F (30d)
173 filings
170 filers
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