IRONWOOD PHARMACEUTICALS INC - Class A common stock, $0.001 par value (IRWD) Institutional Ownership

13F Institutional Holders and Ownership History from Q1 2014 to Q4 2025

Type / Class
Equity / Class A common stock, $0.001 par value
Symbol
IRWD on Nasdaq
Shares outstanding
162,690,355
Price per share
$5.14
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
153,924,339
Total reported value
$518,880,832
% of total 13F portfolios
0%
Share change
+6,129,721
Value change
+$35,964,129
Number of holders
194
Price from insider filings
$5.14
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of IRONWOOD PHARMACEUTICALS INC - Class A common stock, $0.001 par value (IRWD) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
VANGUARD GROUP INC 10% +2.1% $10,855,426 +$338,999 16,202,129 +3.2% The Vanguard Group 30 Jun 2025
ARMISTICE CAPITAL, LLC 9.8% +17% $82,368,500 +$11,950,500 16,025,000 +17% Armistice Capital, LLC 31 Dec 2025
BANK OF AMERICA CORP /DE/ 7.4% $15,702,010 11,986,267 BANK OF AMERICA CORP /DE/ 30 Sep 2025
BlackRock, Inc. 7.1% $9,930,271 11,284,399 BlackRock, Inc. 28 Feb 2025
RENAISSANCE TECHNOLOGIES LLC 5.4% $7,565,534 8,597,198 Renaissance Technologies LLC 15 May 2024
STATE STREET CORP 2.2% -60% $3,078,494 -$4,250,865 3,498,289 -58% STATE STREET CORPORATION 31 Mar 2025
BARCLAYS PLC 2% -70% $4,149,704 -$10,435,649 3,167,713 -72% Barclays PLC 30 Sep 2025
Pacer Advisors, Inc. 1.1% -89% $1,574,406 -$8,748,672 1,789,098 -85% Pacer US Small Cap Cash Cows ETF 31 Mar 2025

As of 31 Dec 2025, 194 institutional investors reported holding 153,924,339 shares of IRONWOOD PHARMACEUTICALS INC - Class A common stock, $0.001 par value (IRWD). This represents 95% of the company’s total 162,690,355 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of IRONWOOD PHARMACEUTICALS INC - Class A common stock, $0.001 par value (IRWD) together control 83% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
ARMISTICE CAPITAL, LLC 9.9% 16,025,000 -0.77% 1.3% $54,004,250
VANGUARD GROUP INC 9.8% 15,958,196 -0.71% 0% $53,779,120
Sarissa Capital Management LP 9.8% 15,919,435 0% 24% $53,648,496
BlackRock, Inc. 7.9% 12,784,806 +6% 0% $43,084,796
BANK OF AMERICA CORP /DE/ 7.1% 11,521,660 -1.5% 0% $38,827,995
RENAISSANCE TECHNOLOGIES LLC 5% 8,204,973 -1.8% 0.04% $27,650,759
ACADIAN ASSET MANAGEMENT LLC 4% 6,457,817 -0.69% 0.04% $21,746,000
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 3.1% 4,975,939 +1.2% 0% $16,768,914
AQR CAPITAL MANAGEMENT LLC 2.9% 4,723,531 -12% 0.01% $15,918,299
MARSHALL WACE, LLP 2.7% 4,424,002 +41% 0.01% $14,908,888
STATE STREET CORP 2.7% 4,411,222 +40% 0% $14,865,818
GEODE CAPITAL MANAGEMENT, LLC 2.2% 3,623,534 +0.24% 0% $12,213,817
FEDERATED HERMES, INC. 2% 3,318,137 +54% 0.02% $11,182,122
TWO SIGMA ADVISERS, LP 1.9% 3,140,100 -5.3% 0.02% $10,582,137
TWO SIGMA INVESTMENTS, LP 1.8% 2,853,205 +13% 0.01% $9,615,301
JANE STREET GROUP, LLC 1.7% 2,819,562 +21% 0.01% $9,501,924
JACOBS LEVY EQUITY MANAGEMENT, INC 1.7% 2,759,667 +44% 0.04% $9,300,078
Connor, Clark & Lunn Investment Management Ltd. 1.2% 1,990,927 -7.9% 0.02% $6,709,424
Qube Research & Technologies Ltd 1% 1,681,229 -40% 0.01% $5,665,742
GOLDMAN SACHS GROUP INC 0.78% 1,275,315 +18% 0% $4,297,812
NORTHERN TRUST CORP 0.76% 1,233,685 -8% 0% $4,157,518
Hillsdale Investment Management Inc. 0.71% 1,156,378 0.11% $3,896,994
DEUTSCHE BANK AG\ 0.68% 1,109,924 -27% 0% $3,740,444
LAZARD ASSET MANAGEMENT LLC 0.61% 1,000,445 0.01% $3,371,500
RAYMOND JAMES FINANCIAL INC 0.53% 869,826 +5681% 0% $2,931,314

Institutional Holders of IRONWOOD PHARMACEUTICALS INC - Class A common stock, $0.001 par value (IRWD) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 153,924,339 $518,880,832 +$35,964,129 $3.37 194
2025 Q3 148,850,076 $195,021,976 +$6,266,415 $1.31 161
2025 Q2 146,448,573 $105,056,220 -$19,990,203 $0.72 151
2025 Q1 155,587,802 $228,692,691 -$26,001,186 $1.47 200
2024 Q4 164,213,918 $727,463,387 +$1,737,232 $4.43 222
2024 Q3 163,472,233 $673,496,034 -$53,233,700 $4.12 218
2024 Q2 171,468,668 $1,117,746,593 -$10,390,681 $6.52 226
2024 Q1 172,118,333 $1,499,071,284 +$34,523,403 $8.71 259
2023 Q4 164,989,974 $1,887,503,875 +$27,460,717 $11.44 248
2023 Q3 162,344,641 $1,563,374,016 -$47,770,085 $9.63 248
2023 Q2 166,095,520 $1,767,006,761 +$4,551,974 $10.64 249
2023 Q1 165,499,147 $1,741,215,310 -$25,432,141 $10.52 253
2022 Q4 167,942,496 $2,080,711,382 -$11,969,237 $12.39 248
2022 Q3 169,832,029 $1,759,668,119 -$66,873,989 $10.36 234
2022 Q2 175,222,861 $2,020,512,624 +$105,001,683 $11.53 229
2022 Q1 166,602,554 $2,094,673,928 -$62,666,606 $12.58 205
2021 Q4 171,908,670 $2,002,842,425 -$78,175,850 $11.66 206
2021 Q3 177,433,352 $2,315,405,743 +$38,243,173 $13.06 216
2021 Q2 174,523,300 $2,245,931,885 +$54,432,994 $12.87 200
2021 Q1 171,145,457 $1,913,286,723 -$10,293,889 $11.18 202
2020 Q4 171,628,514 $1,954,636,964 -$289,602 $11.39 191
2020 Q3 179,160,124 $1,611,634,384 -$60,043,147 $9.00 183
2020 Q2 178,119,023 $1,838,125,889 +$1,165,854 $10.32 196
2020 Q1 178,568,993 $1,801,785,844 +$4,161,742 $10.09 186
2019 Q4 177,455,640 $2,362,005,410 +$49,445,414 $13.31 191
2019 Q3 173,764,399 $1,491,782,455 +$101,224,965 $8.58 156
2019 Q2 161,310,235 $1,764,640,729 +$57,814,939 $10.94 148
2019 Q1 154,995,090 $2,094,495,667 +$91,122,285 $13.53 150
2018 Q4 149,504,826 $1,548,336,251 -$71,151,637 $10.36 141
2018 Q3 144,665,764 $2,670,486,249 -$61,027,521 $18.46 149
2018 Q2 148,813,231 $2,845,437,392 -$59,848,588 $19.12 145
2018 Q1 152,306,846 $2,350,190,262 -$1,008,869 $15.43 145
2017 Q4 152,837,109 $2,291,153,384 -$72,488,750 $14.99 157
2017 Q3 157,184,610 $2,478,904,357 +$150,604,537 $15.77 145
2017 Q2 147,586,787 $2,784,285,643 +$174,107,575 $18.88 165
2017 Q1 146,394,957 $2,497,507,218 +$313,109,692 $17.06 158
2016 Q4 140,093,291 $2,142,057,976 +$7,058,282 $15.29 159
2016 Q3 138,112,999 $2,188,767,596 +$19,185,042 $15.88 150
2016 Q2 137,183,569 $1,793,474,568 -$46,641,420 $13.07 142
2016 Q1 141,086,992 $1,542,611,000 +$6,575,341 $10.94 133
2015 Q4 140,004,988 $1,623,135,302 -$10,046,894 $11.59 133
2015 Q3 141,087,024 $1,469,578,326 -$31,592,141 $10.42 129
2015 Q2 143,581,013 $1,730,907,955 +$111,334,758 $12.06 137
2015 Q1 133,635,220 $2,138,495,680 +$8,239,322 $16.00 142
2014 Q4 133,616,046 $2,046,265,589 +$20,104,400 $15.32 129
2014 Q3 131,914,423 $1,709,440,539 +$65,713,386 $12.96 138
2014 Q2 126,250,568 $1,934,608,469 -$76,713,665 $15.33 136
2014 Q1 131,861,633 $1,624,155,433 +$224,093,523 $12.32 135