IRONWOOD PHARMACEUTICALS INC (IRWD) Institutional Shareholders
IRONWOOD PHARMACEUTICALS INC (IRWD) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $671.54M in IRWD holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of IRWD tracked by InsiderSet, reporting ownership valued at approximately $74.89M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $77.56M, representing an estimated gain of +3.56% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 57% of the total disclosed IRWD value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Armistice Capital, Llc, Sarissa Capital Management Lp, and several other long-term asset managers with concentrated positions in IRONWOOD PHARMACEUTICALS INC (IRWD).
This page ranks the largest institutional IRWD shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
207
Total Reported Value
$671.54M
Largest Holder
Blackrock, Inc.
Largest Position
$74.89M
Insider Transactions (90d)
3
Latest Filing Quarter
Q2 2026
New Institutional Positions
61
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 17,788,557 | $74,889,826 | $77,558,109 | +$2,668,283 | +3.56% | |
| Armistice Capital, Llc | 1.62% | 13,932,000 | $58,653,720 | $60,743,520 | +$2,089,800 | +3.56% | |
| Sarissa Capital Management Lp | 21.75% | 9,188,635 | $38,684,153 | $40,062,449 | +$1,378,296 | +3.56% | |
| State Street Corp | 0.00% | 8,809,601 | $37,088,420 | $38,409,860 | +$1,321,440 | +3.56% | |
| Bank Of America Corp | 0.00% | 8,683,803 | $36,558,810 | $37,861,381 | +$1,302,571 | +3.56% | |
| Renaissance Technologies LLC | Jim Simons | 0.05% | 7,993,226 | $33,651,481 | $34,850,465 | +$1,198,984 | +3.56% |
| Vanguard Capital Management Llc | 0.00% | 6,608,508 | $27,821,819 | $28,813,095 | +$991,276 | +3.56% | |
| Aqr Capital Management Llc | 0.01% | 6,465,921 | $27,221,528 | $28,191,416 | +$969,888 | +3.56% | |
| Acadian Asset Management Llc | 0.03% | 5,853,331 | $24,623,000 | $25,520,523 | +$897,523 | +3.65% | |
| Vanguard Portfolio Management Llc | 0.00% | 5,513,355 | $23,211,225 | $24,038,228 | +$827,003 | +3.56% | |
| Geode Capital Management, Llc | 0.00% | 4,831,657 | $20,345,036 | $21,066,025 | +$720,989 | +3.54% | |
| Two Sigma Investments, Lp | 0.01% | 4,556,089 | $19,181,135 | $19,864,548 | +$683,413 | +3.56% | |
| Marshall Wace, Llp | 0.02% | 4,290,093 | $18,061,293 | $18,704,805 | +$643,512 | +3.56% | |
| Jacobs Levy Equity Management, Inc | 0.06% | 4,065,964 | $17,117,708 | $17,727,603 | +$609,895 | +3.56% | |
| Goldman Sachs Group Inc | 0.00% | 3,313,808 | $13,951,132 | $14,448,203 | +$497,071 | +3.56% | |
| Charles Schwab Investment Management Inc | 0.00% | 3,302,242 | $13,902,439 | $14,397,775 | +$495,336 | +3.56% | |
| Federated Hermes, Inc. | 0.02% | 3,231,238 | $13,603,512 | $14,088,198 | +$484,686 | +3.56% | |
| Arrowstreet Capital, Limited Partnership | 0.01% | 3,017,089 | $12,701,945 | $13,154,508 | +$452,563 | +3.56% | |
| Dimensional Fund Advisors Lp | 0.00% | 2,522,891 | $10,622,431 | $10,999,805 | +$377,374 | +3.55% | |
| Mackenzie Financial Corp | 0.01% | 2,367,493 | $9,967,146 | $10,322,269 | +$355,123 | +3.56% | |
| Morgan Stanley | 0.00% | 1,859,914 | $7,830,240 | $8,109,225 | +$278,985 | +3.56% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | 1,811,714 | $7,627,316 | $7,899,073 | +$271,757 | +3.56% | |
| Northern Trust Corp | 0.00% | 1,373,974 | $5,784,430 | $5,990,527 | +$206,097 | +3.56% | |
| Hillsdale Investment Management Inc. | 0.12% | 1,250,428 | $5,264,302 | $5,451,866 | +$187,564 | +3.56% | |
| Wells Fargo & Company/Mn | 0.00% | 1,206,198 | $5,078,094 | $5,259,023 | +$180,929 | +3.56% | |
| Deutsche Bank Ag\ | 0.00% | 1,158,138 | $4,875,761 | $5,049,482 | +$173,721 | +3.56% | |
| Pacer Advisors, Inc. | 0.01% | 1,095,513 | $4,612,000 | $4,776,437 | +$164,437 | +3.57% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,040,335 | $4,379,810 | $4,535,861 | +$156,051 | +3.56% | |
| Fmr Llc | 0.00% | 909,488 | $3,828,942 | $3,965,368 | +$136,426 | +3.56% | |
| State Of Wisconsin Investment Board | 0.01% | 778,515 | $3,277,548 | $3,394,325 | +$116,777 | +3.56% | |
| Raymond James Financial Inc | 0.00% | 725,085 | $3,052,608 | $3,161,371 | +$108,763 | +3.56% | |
| Victory Capital Management Inc | 0.00% | 658,457 | $2,772,104 | $2,870,873 | +$98,769 | +3.56% | |
| Inspire Investing, Llc | 0.11% | 630,072 | $2,652,603 | $2,747,114 | +$94,511 | +3.56% | |
| Hrt Financial Lp | 0.00% | 577,337 | $2,430,000 | $2,517,189 | +$87,189 | +3.59% | |
| Ieq Capital, Llc | 0.01% | 561,588 | $2,364,286 | $2,448,524 | +$84,238 | +3.56% | |
| Vanguard Global Advisers, Llc | 0.00% | 561,038 | $2,361,970 | $2,446,126 | +$84,156 | +3.56% | |
| Prudential Financial Inc | 0.00% | 537,199 | $2,261,608 | $2,342,188 | +$80,580 | +3.56% | |
| Bank Of New York Mellon Corp | 0.00% | 508,880 | $2,142,384 | $2,218,717 | +$76,333 | +3.56% | |
| Citadel Advisors Llc | 0.00% | 502,403 | $2,115,117 | $2,190,477 | +$75,360 | +3.56% | |
| Voya Investment Management Llc | 0.00% | 484,450 | $2,039,535 | $2,112,202 | +$72,667 | +3.56% | |
| Wellington Management Group Llp | 0.00% | 468,821 | $1,973,737 | $2,044,060 | +$70,323 | +3.56% | |
| Sei Investments Co | 0.00% | 459,417 | $1,934,150 | $2,003,058 | +$68,908 | +3.56% | |
| O'Shaughnessy Asset Management, Llc | 0.01% | 438,911 | $1,847,815 | $1,913,652 | +$65,837 | +3.56% | |
| Wedge Capital Management L L P/Nc | 0.03% | 435,650 | $1,834,087 | $1,899,434 | +$65,347 | +3.56% | |
| Segall Bryant & Hamill, Llc | 0.02% | 408,064 | $1,717,949 | $1,779,159 | +$61,210 | +3.56% | |
| Invesco Ltd. | 0.00% | 403,209 | $1,697,510 | $1,757,991 | +$60,481 | +3.56% | |
| Man Group Plc | 0.00% | 392,117 | $1,650,813 | $1,709,630 | +$58,817 | +3.56% | |
| Bridgeway Capital Management, Llc | 0.03% | 389,793 | $1,641,029 | $1,699,497 | +$58,468 | +3.56% | |
| Ubs Group Ag | 0.00% | 389,529 | $1,639,917 | $1,698,346 | +$58,429 | +3.56% | |
| Bnp Paribas Asset Management Holding S.A. | 0.00% | 375,288 | $1,579,962 | $1,636,256 | +$56,294 | +3.56% |
Frequently asked questions about IRWD
Who owns the most IRWD stock?
The largest holders of IRWD are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for IRONWOOD PHARMACEUTICALS INC (IRWD).
Is IRWD widely held by superinvestors?
Many widely followed stocks like IRWD appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly IRWD is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.