IRWD · Ironwood Pharmaceuticals Inc · Holdings
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.
Institutional Ownership Trend
Holder Concentration
Across 212 13F filersWho Holds IRWD
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 212 filers, like-for-like change -0.4%; actively managed books -7.5%; index-like books +20.8%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 49.0% | 108 | -5.4% |
| Exempt adviser | 2.9% | 2 | -24.7% |
| Adviser | 8.7% | 6 | -1.8% |
| Bank | 13.5% | 13 | +11.8% |
| Insurer | 0.3% | 2 | +19.1% |
| Broker-dealer | 0.0% | 1 | new |
| Benefit plan | 0.6% | 4 | +0.2% |
| Non-US | 1.1% | 6 | +0.9% |
| Holding company | 15.2% | 9 | +31.4% |
| Unknown | 8.7% | 61 | -16.0% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 30.5% | 27 | +20.8% |
| Systematic-like | 6.6% | 18 | -25.1% |
| Concentrated | 5.9% | 24 | -1.1% |
| Diversified active | 57.1% | 143 | -5.6% |
| Unknown | 0.0% | 0 | -100.0% |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 47.0% | 121 | +11.2% |
| Medium turnover | 37.1% | 52 | -3.9% |
| High turnover | 7.1% | 25 | -31.7% |
| Unknown | 8.7% | 14 | -3.5% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 9.0% | 19 | -9.1% |
| Medium horizon | 13.0% | 36 | +24.6% |
| Long horizon | 62.7% | 144 | +0.9% |
| Unknown | 15.3% | 13 | -14.7% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 6.7% | 41 | -9.6% |
| $1B to $10B | 11.9% | 49 | -6.2% |
| $10B to $100B | 24.1% | 65 | -2.1% |
| $100B or more | 57.3% | 57 | +2.9% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 2.1% | 54 | -4.3% |
| Pooled investment vehicles | 21.6% | 16 | -5.0% |
| Registered funds and BDCs | 15.9% | 17 | -5.5% |
| Pension and profit sharing plans | 0.0% | 2 | -4.2% |
| Insurance companies | 0.4% | 3 | +166.1% |
| Governments and sovereign funds | 0.2% | 2 | -66.8% |
| Other investment advisers | 0.0% | 3 | -9.5% |
| Diversified | 8.8% | 11 | -5.2% |
| Other | 0.0% | 0 | — |
| Unknown | 51.0% | 104 | +4.9% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 30.8% | 22 | -10.3% |
| Private equity funds | 0.7% | 7 | -6.6% |
| Venture capital funds | 0.0% | 1 | -1.2% |
| Real estate funds | 0.1% | 5 | +316.7% |
| Other private funds | 4.4% | 18 | +44.4% |
| Mixed private funds | 0.3% | 3 | 0.0% |
| Private funds, type not stated | 0.3% | 2 | +89.8% |
| No private funds | 15.3% | 52 | -10.1% |
| Securitized asset funds | 0.0% | 0 | — |
| Liquidity funds | 0.0% | 0 | — |
| Unknown | 48.2% | 102 | +7.4% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 91.2% | 179 | +0.6% |
| Outside the US | 8.8% | 33 | -9.9% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 1 holder with no observed 2026-03-31 13F and 3 holders with no observed 2026-06-30 13F.
Conviction and Crowding
212 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 38.0% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies IRWD's active holders also own, quarter ended Jun 30, 2026Shareholder Targets
13F filers that own its peers but not IRWD, quarter ended Jun 30, 2026Found through its holder-overlap peers: NVO, BMY, TMO, PFE, MSFT, UNH, INTC, AMAT, AMZN, MRK, MU, ABBV, LLY, AVGO, NVDA, AAPL, GOOGL. 7,068 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | NORGES BANK Non-US, Index-like | $343,206,946,300 16 held | NVDA, GOOGL, AAPL |
| 2 | Capital Research Global Investors Adviser, Diversified active | $273,986,952,179 15 held | AVGO, NVDA, GOOGL |
| 3 | Capital World Investors Adviser, Diversified active | $242,801,931,222 16 held | AVGO, GOOGL, MU |
| 4 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser, Index-like | $195,491,759,100 17 held | NVDA, AAPL, GOOGL |
| 5 | Capital International Investors Adviser, Diversified active | $151,936,717,540 16 held | AVGO, GOOGL, MSFT |
| 6 | LILLY ENDOWMENT INC Unknown, Unknown | $108,400,867,760 1 held | LLY |
| 7 | Berkshire Hathaway Inc Insurer, Concentrated | $103,714,385,303 2 held | AAPL, GOOGL |
| 8 | Fisher Asset Management, LLC Adviser, Diversified active | $95,788,951,752 17 held | NVDA, AAPL, GOOGL |
| 9 | PNC FINANCIAL SERVICES GROUP, INC. Bank, Concentrated | $84,463,080,759 17 held | LLY, AAPL, GOOGL |
| 10 | Swiss National Bank Unknown, Index-like | $68,400,762,576 16 held | NVDA, AAPL, GOOGL |
Fund Ownership of IRWD by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 20.81% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 3.83% | 6,325,284 |
| Index ETFs | 16.98% | 28,052,961 |
| Active ETFs | 1.65% | 2,725,539 |
| Active funds | 6.87% | 11,344,701 |
| Unclassified | 1.28% | 2,118,379 |
| All registered funds | 30.60% | 50,566,864 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $74,889,820 | 11.01% | 17,788,557 | Shares | 2026-08-07 | |
| Mid ARMISTICE CAPITAL, LLC Registered adviser | $58,653,720 | 8.62% | 13,932,000 | Shares | 2026-08-14 | |
| Small Sarissa Capital Management LP Adviser | $38,684,153 | 5.69% | 9,188,635 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP Bank | $37,088,420 | 5.45% | 8,809,601 | Shares | 2026-09-22 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $36,558,810 | 5.38% | 8,683,803 | Shares | 2026-08-14 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $33,651,481 | 4.95% | 7,993,226 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $27,821,818 | 4.09% | 6,608,508 | Shares | 2026-08-13 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $27,221,524 | 4.00% | 6,465,921 | Shares | 2026-08-14 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $24,642,523 | 3.62% | 5,853,331 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $23,211,224 | 3.41% | 5,513,355 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $20,341,275 | 2.99% | 4,831,657 | Shares | 2026-08-12 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $19,181,134 | 2.82% | 4,556,089 | Shares | 2026-08-14 | |
| Large MARSHALL WACE, LLP Exempt adviser | $18,061,290 | 2.66% | 4,290,093 | Shares | 2026-08-13 | |
| Large JACOBS LEVY EQUITY MANAGEMENT, INC Registered adviser | $17,117,708 | 2.52% | 4,065,964 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $13,951,131 | 2.05% | 3,313,808 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $13,902,438 | 2.04% | 3,302,242 | Shares | 2026-08-14 | |
| Large FEDERATED HERMES, INC. Adviser | $13,603,511 | 2.00% | 3,231,238 | Shares | 2026-08-12 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Registered adviser | $12,701,944 | 1.87% | 3,017,089 | Shares | 2026-08-13 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $10,621,369 | 1.56% | 2,522,891 | Shares | 2026-08-11 | |
| Large MACKENZIE FINANCIAL CORP Registered adviser | $9,967,145 | 1.47% | 2,367,493 | Shares | 2026-08-13 | |
| Mega MORGAN STANLEY Holding company | $7,830,234 | 1.15% | 1,859,914 | Shares | 2026-08-13 | |
| Large Connor, Clark & Lunn Investment Management Ltd. Registered adviser | $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. Registered adviser | $5,264,301 | 0.77% | 1,250,428 | Shares | 2026-08-12 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $5,078,093 | 0.75% | 1,206,198 | Shares | 2026-08-14 | |
| Mega DEUTSCHE BANK AG\ Non-US | $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 | $4,379,810 | 0.64% | 1,040,335 | Shares | 2026-08-13 | |
| Mega FRANKLIN RESOURCES INC Adviser | $4,239,379 | 0.62% | 1,006,979 | Shares | 2026-08-13 | |
| Mega FMR LLC Holding company | $3,828,944 | 0.56% | 909,488 | Shares | 2026-08-13 | |
| Large STATE OF WISCONSIN INVESTMENT BOARD Benefit plan | $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 Registered adviser | $2,772,103 | 0.41% | 658,457 | Shares | 2026-08-07 | |
| Mid Inspire Investing, LLC Registered adviser | $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 Registered adviser | $2,364,285 | 0.35% | 561,588 | Shares | 2026-08-11 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $2,361,969 | 0.35% | 561,038 | Shares | 2026-08-13 | |
| Large PRUDENTIAL FINANCIAL INC Insurer | $2,261,607 | 0.33% | 537,199 | Shares | 2026-08-12 | |
| Mega Bank of New York Mellon Corp Bank | $2,142,383 | 0.31% | 508,880 | Shares | 2026-08-06 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $2,115,116 | 0.31% | 502,403 | Shares | 2026-09-02 | |
| Mega VOYA INVESTMENT MANAGEMENT LLC Registered adviser | $2,039,533 | 0.30% | 484,450 | Shares | 2026-08-12 | |
| Mid CWA Asset Management Group, LLC Registered adviser | $1,979,612 | 0.29% | 498,643 | Shares | 2026-10-19 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $1,973,734 | 0.29% | 468,821 | Shares | 2026-08-14 | |
| Mega SEI INVESTMENTS CO | $1,934,144 | 0.28% | 459,417 | Shares | 2026-08-14 | |
| Large O'SHAUGHNESSY ASSET MANAGEMENT, LLC Registered adviser | $1,847,815 | 0.27% | 438,911 | Shares | 2026-08-13 | |
| Mid WEDGE CAPITAL MANAGEMENT L L P/NC | $1,729,530 | 0.25% | 435,650 | Shares | 2026-10-13 | |
| Mid SEGALL BRYANT & HAMILL, LLC Registered adviser | $1,717,949 | 0.25% | 408,064 | Shares | 2026-08-12 | |
| Mega Invesco Ltd. Adviser | $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 Registered adviser | $1,641,028 | 0.24% | 389,793 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $1,639,916 | 0.24% | 389,529 | Shares | 2026-08-13 | |
| Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. Non-US | $1,579,962 | 0.23% | 375,288 | Shares | 2026-08-13 | |
| Mid RITHOLTZ WEALTH MANAGEMENT Registered adviser | $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 Exempt adviser | $1,465,016 | 0.22% | 347,985 | Shares | 2026-08-14 | |
| Large LOS ANGELES CAPITAL MANAGEMENT LLC Registered adviser | $1,441,053 | 0.21% | 342,293 | Shares | 2026-08-13 | |
| Large Robeco Institutional Asset Management B.V. | $1,361,702 | 0.20% | 342,998 | Shares | 2026-10-20 | |
| Small Virtus Investment Advisers, LLC Registered adviser | $1,341,297 | 0.20% | 318,598 | Shares | 2026-08-11 | |
| Large LSV ASSET MANAGEMENT Registered adviser | $1,297,820 | 0.19% | 308,271 | Shares | 2026-08-06 | |
| Small GLOBEFLEX CAPITAL L P Registered adviser | $1,093,795 | 0.16% | 259,809 | Shares | 2026-08-12 | |
| Mid GSA CAPITAL PARTNERS LLP Registered adviser | $1,092,545 | 0.16% | 259,512 | Shares | 2026-08-06 | |
| Mega CITIGROUP INC Bank | $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 | |
| Mega JPMORGAN CHASE & CO Bank | $894,940 | 0.13% | 212,575 | Shares | 2026-08-12 | |
| Large Cerity Partners LLC Registered adviser | $875,759 | 0.13% | 208,019 | Shares | 2026-08-14 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $863,449 | 0.13% | 205,095 | Shares | 2026-08-12 | |
| Mid MARTINGALE ASSET MANAGEMENT L P Registered adviser | $863,012 | 0.13% | 204,991 | Shares | 2026-08-13 | |
| Large WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $849,953 | 0.12% | 214,094 | Shares | 2026-10-13 | |
| Mid EVOLVE PRIVATE WEALTH, LLC | $786,697 | 0.12% | 186,864 | Shares | 2026-08-12 | |
| Large Vident Advisory, LLC Registered adviser | $761,711 | 0.11% | 180,929 | Shares | 2026-08-12 | |
| Mega Creative Planning Registered adviser | $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 Registered adviser | $709,267 | 0.10% | 168,472 | Shares | 2026-08-13 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $697,975 | 0.10% | 165,790 | Shares | 2026-08-14 | |
| Large OMERS ADMINISTRATION Corp Benefit plan | $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 Registered adviser | $643,616 | 0.09% | 152,878 | Shares | 2026-08-14 | |
| Large Quantinno Capital Management LP Registered adviser | $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 Non-US | $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 | $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/ Registered adviser | $542,130 | 0.08% | 128,772 | Shares | 2026-08-14 | |
| Large Arax Advisory Partners Registered adviser | $534,526 | 0.08% | 126,966 | Shares | 2026-08-10 | |
| Large MERCER GLOBAL ADVISORS INC /ADV Registered adviser | $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 Registered adviser | $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 Registered adviser | $426,801 | 0.06% | 101,378 | Shares | 2026-08-14 | |
| Mega BARCLAYS PLC Bank | $421,517 | 0.06% | 100,123 | Shares | 2026-08-14 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $419,004 | 0.06% | 99,526 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $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 Registered adviser | $405,035 | 0.06% | 96,208 | Shares | 2026-08-14 | |
| Small Integrated Quantitative Investments LLC Registered adviser | $394,430 | 0.06% | 93,689 | Shares | 2026-08-14 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $392,333 | 0.06% | 93,191 | Shares | 2026-08-14 |
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