Ironwood Pharmaceuticals Inc. 13F holders
212 funds reported a position in Ironwood Pharmaceuticals Inc. in their 13F for the quarter ended 30 June 2026, together 160.6 million shares worth $675.8 million. Against the quarter before, 22 opened a position, 72 added, 84 trimmed and 36 sold out; together they sold a net 660,814 shares. The largest holders: BlackRock, Inc., Armistice Capital, LLC and Sarissa Capital Management LP.
Funds holding212-15 on Q1 2026
Shares they held160.6Mworth $675.8 million
Net sold on the quarter660,814 sharesabout $2.8 million at the funds' values
Funds buying to selling94 to 120opened or added, to cut or sold
Opened 22Added 72Held 33Trimmed 84Sold out 36
What each fund did in IRWD against its 13F for the quarter before; a change under 0.1% of a holding counts as held
Funds reporting a position in IRWD in their 13F, each quarter; hover a bar for the shares they held
Filed so far for the quarter to 30 September 2026
3,241 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 45 reported a position in Ironwood Pharmaceuticals Inc.: 9 opened one, 15 added, 11 trimmed and 5 sold out, a net 279,896 shares sold.
The largest moves in the name among the funds that have filed, against each fund's previous 13F.
The well-known funds
Of the 44 funds followed here, 5 reported a position in Ironwood Pharmaceuticals Inc. in a 13F for the quarter ended 30 June 2026. The largest: Renaissance Technologies, 8.0 million shares worth $33.7 million, 0.0% of its reported book. Sold out: Millennium Management. In the quarter, 3 funds added or opened a position and 3 trimmed or sold out; together they sold a net 1.0 million shares, about $4.3 million at the funds' own value per share on 30 June 2026. A change under 0.1% of a holding counts as held.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| Renaissance Technologies | 7,993,226 | $33.7 million | 0.0% | -67,847 | trimmed | 30 June 2026 | 13F |
| Geode Capital Management | 4,831,657 | $20.3 million | 0.0% | +288,135 | added | 30 June 2026 | 13F |
| Two Sigma Investments | 4,556,089 | $19.2 million | 0.0% | -1,292,187 | trimmed | 30 June 2026 | 13F |
| FMR LLC | 909,488 | $3.8 million | 0.0% | +119,102 | added | 30 June 2026 | 13F |
| Citadel Advisors | 502,403 | $2.1 million | 0.0% | +384,127 | added | 30 June 2026 | 13F |
| Millennium Management | 0 | $0 | 0.0% | -457,114 | exited | 30 June 2026 | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.The largest holders
| Fund | Shares | Share of all | Value | Of its book | Change in shares | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 17,788,557 | 11.08% | $74.9 million | 0.00% | +4,425,627 | 13F |
| Armistice Capital, LLC | 13,932,000 | 8.68% | $58.7 million | 1.62% | -1,096,000 | 13F |
| Sarissa Capital Management LP | 9,188,635 | 5.72% | $38.7 million | 21.75% | no change | 13F |
| State Street Corp. | 8,809,601 | 5.49% | $37.1 million | 0.00% | +1,352,657 | 13F |
| Bank of America Corp. | 8,683,803 | 5.41% | $36.6 million | 0.00% | +896 | 13F |
| Renaissance Technologies LLC | 7,993,226 | 4.98% | $33.7 million | 0.05% | -67,847 | 13F |
| Vanguard Capital Management LLC | 6,608,508 | 4.12% | $27.8 million | 0.00% | +511,054 | 13F |
| AQR Capital Management LLC | 6,465,921 | 4.03% | $27.2 million | 0.01% | -1,069,159 | 13F |
| Acadian Asset Management LLC | 5,853,331 | 3.65% | $24.6 million | 0.03% | -723,941 | 13F |
| Vanguard Portfolio Management LLC | 5,513,355 | 3.43% | $23.2 million | 0.00% | -1,168,682 | 13F |
| Geode Capital Management, LLC | 4,831,657 | 3.01% | $20.3 million | 0.00% | +288,135 | 13F |
| Two Sigma Investments, LP | 4,556,089 | 2.84% | $19.2 million | 0.01% | -1,292,187 | 13F |
| Marshall Wace, LLP | 4,290,093 | 2.67% | $18.1 million | 0.01% | -234,971 | 13F |
| Jacobs Levy Equity Management, Inc. | 4,065,964 | 2.53% | $17.1 million | 0.06% | +433,487 | 13F |
| Goldman Sachs Group Inc. | 3,313,808 | 2.06% | $14.0 million | 0.00% | +623,174 | 13F |
| Charles Schwab Investment Management Inc. | 3,302,242 | 2.06% | $13.9 million | 0.00% | -1,435,615 | 13F |
| Federated Hermes, Inc. | 3,231,238 | 2.01% | $13.6 million | 0.02% | -117,568 | 13F |
| Arrowstreet Capital, Limited Partnership | 3,017,089 | 1.88% | $12.7 million | 0.01% | -380,153 | 13F |
| Dimensional Fund Advisors LP | 2,522,891 | 1.57% | $10.6 million | 0.00% | +440,836 | 13F |
| Mackenzie Financial Corp. | 2,367,493 | 1.47% | $10.0 million | 0.01% | +1,807,459 | 13F |
| Morgan Stanley | 1,859,914 | 1.16% | $7.8 million | 0.00% | +1,035,095 | 13F |
| Connor, Clark & Lunn Investment Management Ltd. | 1,811,714 | 1.13% | $7.6 million | 0.01% | -23,710 | 13F |
| Northern Trust Corp. | 1,373,974 | 0.86% | $5.8 million | 0.00% | +108,132 | 13F |
| Hillsdale Investment Management Inc. | 1,250,428 | 0.78% | $5.3 million | 0.12% | +13,800 | 13F |
| Wells Fargo & Company | 1,206,198 | 0.75% | $5.1 million | 0.00% | +1,147,348 | 13F |
| Deutsche Bank AG | 1,158,138 | 0.72% | $4.9 million | 0.00% | +33,149 | 13F |
| Pacer Advisors, Inc. | 1,095,513 | 0.68% | $4.6 million | 0.01% | -38,999 | 13F |
| Vanguard Fiduciary Trust Co. | 1,040,335 | 0.65% | $4.4 million | 0.00% | +51,705 | 13F |
| Franklin Resources Inc. | 1,006,979 | 0.63% | $4.2 million | 0.00% | +262,341 | 13F |
| FMR LLC | 909,488 | 0.57% | $3.8 million | 0.00% | +119,102 | 13F |
| State of Wisconsin Investment Board | 778,515 | 0.48% | $3.3 million | 0.01% | +180,356 | 13F |
| Raymond James Financial Inc. | 725,085 | 0.45% | $3.1 million | 0.00% | -38,870 | 13F |
| Victory Capital Management Inc. | 658,457 | 0.41% | $2.8 million | 0.00% | -54,730 | 13F |
| Inspire Investing, LLC | 630,072 | 0.39% | $2.7 million | 0.11% | +120,131 | 13F |
| HRT Financial LP | 577,337 | 0.36% | $2.4 million | 0.00% | new | 13F |
| Ieq Capital, LLC | 561,588 | 0.35% | $2.4 million | 0.01% | -181,135 | 13F |
| Vanguard Global Advisers, LLC | 561,038 | 0.35% | $2.4 million | 0.00% | -30,451 | 13F |
| Prudential Financial Inc. | 537,199 | 0.33% | $2.3 million | 0.00% | +87,360 | 13F |
| Bank of New York Mellon Corp | 508,880 | 0.32% | $2.1 million | 0.00% | +24,844 | 13F |
| Citadel Advisors LLC | 502,403 | 0.31% | $2.1 million | 0.00% | +384,127 | 13F |
| Voya Investment Management LLC | 484,450 | 0.30% | $2.0 million | 0.00% | +338,631 | 13F |
| Wellington Management Group LLP | 468,821 | 0.29% | $2.0 million | 0.00% | +15,306 | 13F |
| Sei Investments Co. | 459,417 | 0.29% | $1.9 million | 0.00% | -283,131 | 13F |
| O'shaughnessy Asset Management, LLC | 438,911 | 0.27% | $1.8 million | 0.01% | +310,668 | 13F |
| Wedge Capital Management L L P | 435,650 | 0.27% | $1.8 million | 0.03% | -104,842 | 13F |
| Segall Bryant & Hamill, LLC | 408,064 | 0.25% | $1.7 million | 0.02% | +129,863 | 13F |
| Invesco Ltd. | 403,209 | 0.25% | $1.7 million | 0.00% | -144,151 | 13F |
| Man Group plc | 392,117 | 0.24% | $1.7 million | 0.00% | -148,747 | 13F |
| Bridgeway Capital Management, LLC | 389,793 | 0.24% | $1.6 million | 0.03% | -50,700 | 13F |
| UBS Group AG | 389,529 | 0.24% | $1.6 million | 0.00% | -543,696 | 13F |
The 50 largest of the 212 funds that reported a position in IRWD in their 13F for the quarter ended 30 June 2026, by the value each reported.
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Share of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?Options the funds reported on IRWD
| Fund | Option | Shares under the options | Value of those shares | Quarter ended | Filing |
|---|---|---|---|---|---|
| Citadel Advisors | Puts | 98,300 | $413,843 | 30 June 2026 | 13F |
| Citadel Advisors | Calls | 76,000 | $319,960 | 30 June 2026 | 13F |
A 13F lists calls and puts by the shares they cover and what those shares were worth at the quarter's end, not what the options cost.
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They are not counted in the holdings above. A put gains when the stock falls, a call when it rises, and a fund may hold either to hedge.Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 28 October 2026 | 13G/A | Bank Of America Corp and 1 other | 5.2 million | 3.2% | 30 September 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 14 August 2026 | 13G/A | Armistice Capital, LLC and 3 others | 13.9 million | 8.4% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 7 August 2026 | 13G | State Street Corporation and 1 other | 8.8 million | 5.4% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 28 July 2026 | 13G/A | BlackRock, Inc. and 1 other | 13.4 million | 8.1% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 15 May 2026 | 13G/A | Armistice Capital, LLC and 3 others | 15.0 million | 9.2% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 14 May 2026 | 13G/A | Renaissance Technologies LLC and 3 others | 8.1 million | 4.9% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 27 April 2026 | 13G/A | Bank Of America Corp and 1 other | 10.0 million | 6.1% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 27 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 19 March 2026 | 13D/A | Sarissa Capital Management LP and 1 other | 9.4 million | 5.8% | 17 March 2026 | EDGAR | |
| 17 February 2026 | 13G/A | Armistice Capital, LLC and 3 others | 16.0 million | 9.8% | 31 December 2025 | passive, institutional (13d-1(b)) | EDGAR |
| 14 November 2025 | 13G | Bank Of America Corp and 1 other | 12.0 million | 7.4% | 30 September 2025 | passive, institutional (13d-1(b)) | EDGAR |
| 12 November 2025 | 13G/A | Barclays PLC and 1 other | 3.2 million | 1.9% | 30 September 2025 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13GFails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 21 September 2026 | 169,040 | $4.36 | SEC |
| 18 September 2026 | 3,363 | $4.23 | SEC |
| 4 September 2026 | 211 | $4.29 | SEC |
| 24 August 2026 | 97 | $4.29 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.