IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (IRWD) Institutional Ownership

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

Type / Class
Equity / Class A Common Stock
Symbol
IRWD on Nasdaq
Shares outstanding
161,976,581
Price per share
$3.37
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
148,850,076
Total reported value
$195,021,976
% of total 13F portfolios
0%
Share change
+2,428,310
Value change
+$6,266,415
Number of holders
161
Price from insider filings
$3.37
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (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 8.5% +42% $12,056,000 +$3,724,160 13,700,000 +45% Armistice Capital, LLC 31 Mar 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 30 Sep 2025, 161 institutional investors reported holding 148,850,076 shares of IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (IRWD). This represents 92% of the company’s total 161,976,581 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (IRWD) together control 84% 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 10% 16,150,000 0% 0.66% $21,156,500
VANGUARD GROUP INC 9.9% 16,072,006 -0.8% 0% $21,054,327
Sarissa Capital Management LP 9.8% 15,919,435 0% 12% $20,854,460
BlackRock, Inc. 7.4% 12,062,558 +0.33% 0% $15,801,953
BANK OF AMERICA CORP /DE/ 7.2% 11,695,544 +248% 0% $15,321,162
RENAISSANCE TECHNOLOGIES LLC 5.2% 8,352,173 -0.64% 0.01% $10,941,347
ACADIAN ASSET MANAGEMENT LLC 4% 6,502,493 -0.72% 0.01% $8,505,000
Kynam Capital Management, LP 3.4% 5,466,825 0% 0.53% $7,161,541
AQR CAPITAL MANAGEMENT LLC 3.3% 5,378,535 -13% 0% $7,045,881
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 3% 4,917,336 +34% 0% $6,441,710
GEODE CAPITAL MANAGEMENT, LLC 2.2% 3,614,987 +3.3% 0% $4,736,657
TWO SIGMA ADVISERS, LP 2% 3,316,500 -2% 0.01% $4,344,615
STATE STREET CORP 1.9% 3,156,307 +1.6% 0% $4,134,762
MARSHALL WACE, LLP 1.9% 3,144,139 -21% 0% $4,118,822
Qube Research & Technologies Ltd 1.7% 2,806,910 -16% 0.01% $3,677,052
TWO SIGMA INVESTMENTS, LP 1.6% 2,534,511 -7.9% 0.01% $3,320,209
JANE STREET GROUP, LLC 1.4% 2,321,095 +33% 0% $3,040,635
Connor, Clark & Lunn Investment Management Ltd. 1.3% 2,161,818 -2% 0.01% $2,831,982
FEDERATED HERMES, INC. 1.3% 2,157,104 -0.92% 0% $2,825,806
JACOBS LEVY EQUITY MANAGEMENT, INC 1.2% 1,920,530 +30% 0.01% $2,515,894
DEUTSCHE BANK AG\ 0.94% 1,527,229 +0.26% 0% $2,000,670
NORTHERN TRUST CORP 0.83% 1,340,906 +2.7% 0% $1,756,587
LOS ANGELES CAPITAL MANAGEMENT LLC 0.7% 1,130,052 -6.7% 0.01% $1,480,368
GOLDMAN SACHS GROUP INC 0.67% 1,084,367 -25% 0% $1,420,521
UBS Group AG 0.5% 811,664 +170% 0% $1,063,279

Institutional Holders of IRONWOOD PHARMACEUTICALS INC - Class A Common Stock (IRWD) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 1,051,115 $3,699,894 +$1,192,107 $3.37 17
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