IRWD Institutional Ownership & Shareholders
IRONWOOD PHARMACEUTICALS INC (IRWD) is currently held by 215 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $671.46M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
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 $61.55M, representing an estimated loss of -17.81% 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
215
Total Reported Value
$671.46M
Largest Holder
Blackrock, Inc.
Largest Position
$74.89M
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
65
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 | $61,548,407 | -$13,341,419 | -17.81% | |
| Armistice Capital, Llc | 1.62% | 13,932,000 | $58,653,720 | $48,204,720 | -$10,449,000 | -17.81% | |
| Sarissa Capital Management Lp | 21.75% | 9,188,635 | $38,684,153 | $31,792,677 | -$6,891,476 | -17.81% | |
| State Street Corp | 0.00% | 8,809,601 | $37,088,420 | $30,481,219 | -$6,607,201 | -17.81% | |
| Bank Of America Corp | 0.00% | 8,683,803 | $36,558,810 | $30,045,958 | -$6,512,852 | -17.81% | |
| Renaissance Technologies LLC | Jim Simons | 0.05% | 7,993,226 | $33,651,481 | $27,656,562 | -$5,994,919 | -17.81% |
| Vanguard Capital Management Llc | 0.00% | 6,608,508 | $27,821,819 | $22,865,438 | -$4,956,381 | -17.81% | |
| Aqr Capital Management Llc | 0.01% | 6,465,921 | $27,221,528 | $22,372,087 | -$4,849,441 | -17.81% | |
| Acadian Asset Management Llc | 0.03% | 5,853,331 | $24,623,000 | $20,252,525 | -$4,370,475 | -17.75% | |
| Vanguard Portfolio Management Llc | 0.00% | 5,513,355 | $23,211,225 | $19,076,208 | -$4,135,017 | -17.81% | |
| Geode Capital Management, Llc | 0.00% | 4,831,657 | $20,345,036 | $16,717,533 | -$3,627,503 | -17.83% | |
| Two Sigma Investments, Lp | 0.01% | 4,556,089 | $19,181,135 | $15,764,068 | -$3,417,067 | -17.81% | |
| Marshall Wace, Llp | 0.02% | 4,290,093 | $18,061,293 | $14,843,722 | -$3,217,571 | -17.81% | |
| Jacobs Levy Equity Management, Inc | 0.06% | 4,065,964 | $17,117,708 | $14,068,235 | -$3,049,473 | -17.81% | |
| Goldman Sachs Group Inc | 0.00% | 3,313,808 | $13,951,132 | $11,465,776 | -$2,485,356 | -17.81% | |
| Charles Schwab Investment Management Inc | 0.00% | 3,302,242 | $13,902,439 | $11,425,757 | -$2,476,682 | -17.81% | |
| Federated Hermes, Inc. | 0.02% | 3,231,238 | $13,603,512 | $11,180,083 | -$2,423,429 | -17.81% | |
| Arrowstreet Capital, Limited Partnership | 0.01% | 3,017,089 | $12,701,945 | $10,439,128 | -$2,262,817 | -17.81% | |
| Dimensional Fund Advisors Lp | 0.00% | 2,522,891 | $10,622,431 | $8,729,203 | -$1,893,228 | -17.82% | |
| Mackenzie Financial Corp | 0.01% | 2,322,690 | $9,221,079 | $8,036,507 | -$1,184,572 | -12.85% | |
| Morgan Stanley | 0.00% | 1,859,914 | $7,830,240 | $6,435,302 | -$1,394,938 | -17.81% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | 1,811,714 | $7,627,316 | $6,268,530 | -$1,358,786 | -17.81% | |
| Northern Trust Corp | 0.00% | 1,373,974 | $5,784,430 | $4,753,950 | -$1,030,480 | -17.81% | |
| Hillsdale Investment Management Inc. | 0.12% | 1,250,428 | $5,264,302 | $4,326,481 | -$937,821 | -17.81% | |
| Wells Fargo & Company/Mn | 0.00% | 1,206,198 | $5,078,094 | $4,173,445 | -$904,649 | -17.81% | |
| Deutsche Bank Ag\ | 0.00% | 1,158,138 | $4,875,761 | $4,007,157 | -$868,604 | -17.81% | |
| Pacer Advisors, Inc. | 0.01% | 1,095,513 | $4,612,000 | $3,790,475 | -$821,525 | -17.81% | |
| Vanguard Fiduciary Trust Co | 0.00% | 1,040,335 | $4,379,810 | $3,599,559 | -$780,251 | -17.81% | |
| Fmr Llc | 0.00% | 909,488 | $3,828,942 | $3,146,828 | -$682,114 | -17.81% | |
| State Of Wisconsin Investment Board | 0.01% | 778,515 | $3,277,548 | $2,693,662 | -$583,886 | -17.81% | |
| Raymond James Financial Inc | 0.00% | 725,085 | $3,052,608 | $2,508,794 | -$543,814 | -17.81% | |
| Victory Capital Management Inc | 0.00% | 658,457 | $2,772,104 | $2,278,261 | -$493,843 | -17.81% | |
| Hrt Financial Lp | 0.00% | 577,337 | $2,430,000 | $1,997,586 | -$432,414 | -17.79% | |
| Ieq Capital, Llc | 0.01% | 561,588 | $2,364,286 | $1,943,094 | -$421,192 | -17.81% | |
| Vanguard Global Advisers, Llc | 0.00% | 561,038 | $2,361,970 | $1,941,191 | -$420,779 | -17.81% | |
| Prudential Financial Inc | 0.00% | 537,199 | $2,261,608 | $1,858,709 | -$402,899 | -17.81% | |
| Bank Of New York Mellon Corp | 0.00% | 508,880 | $2,142,384 | $1,760,725 | -$381,659 | -17.81% | |
| Citadel Advisors Llc | 0.00% | 502,403 | $2,115,117 | $1,738,314 | -$376,803 | -17.81% | |
| Voya Investment Management Llc | 0.00% | 484,450 | $2,039,535 | $1,676,197 | -$363,338 | -17.81% | |
| Cwa Asset Management Group, Llc | 0.06% | 498,643 | $1,979,613 | $1,725,305 | -$254,308 | -12.85% | |
| Wellington Management Group Llp | 0.00% | 468,821 | $1,973,737 | $1,622,121 | -$351,616 | -17.81% | |
| Sei Investments Co | 0.00% | 459,417 | $1,934,150 | $1,589,583 | -$344,567 | -17.81% | |
| O'Shaughnessy Asset Management, Llc | 0.01% | 438,911 | $1,847,815 | $1,518,632 | -$329,183 | -17.81% | |
| Wedge Capital Management L L P/Nc | 0.03% | 435,650 | $1,729,531 | $1,507,349 | -$222,182 | -12.85% | |
| Segall Bryant & Hamill, Llc | 0.02% | 408,064 | $1,717,949 | $1,411,901 | -$306,048 | -17.81% | |
| Invesco Ltd. | 0.00% | 403,209 | $1,697,510 | $1,395,103 | -$302,407 | -17.81% | |
| Man Group Plc | 0.00% | 392,117 | $1,650,813 | $1,356,725 | -$294,088 | -17.81% | |
| Bridgeway Capital Management, Llc | 0.03% | 389,793 | $1,641,029 | $1,348,684 | -$292,345 | -17.81% | |
| Ubs Group Ag | 0.00% | 389,529 | $1,639,917 | $1,347,770 | -$292,147 | -17.81% | |
| Bnp Paribas Asset Management Holding S.A. | 0.00% | 375,288 | $1,579,962 | $1,298,496 | -$281,466 | -17.81% |
Frequently asked questions about IRWD
Who are the largest institutional holders of IRWD?
The largest institutional holders of IRWD reported in the latest SEC Form 13F filings include Blackrock, Inc., Armistice Capital, Llc, Sarissa Capital Management Lp, State Street Corp, and Bank Of America Corp. InsiderSet ranks institutional holders by their latest reported IRWD position.
What is IRWD institutional ownership?
This page tracks IRWD positions reported by institutional investment managers through SEC Form 13F. IRONWOOD PHARMACEUTICALS INC (IRWD) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own IRWD?
InsiderSet currently tracks 215 institutional managers reporting IRWD holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of IRWD shareholders.
How much IRWD stock do institutions own?
Institutional investment managers disclosed approximately $671.46M in IRWD holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was IRWD institutional ownership last updated?
The latest IRWD institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional IRWD holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its IRWD position after the reporting date.
Are institutions buying or selling IRWD?
Institutional buying and selling can be analyzed by comparing IRWD positions across consecutive 13F reporting periods. InsiderSet's IRWD Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View IRWD ownership changes.
How has IRWD institutional ownership changed over time?
InsiderSet tracks IRWD institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.