IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD)
CUSIP: 46333X108
Q4 2025 13F Holders as of 31 Dec 2025
- Type / Class
- Equity / Class A Common Stock, $0.001 par value
- Shares outstanding
- 162,843,862
- Total 13F shares
- 153,956,131
- Share change
- +6,460,716
- Total reported value
- $518,987,593
- Put/Call ratio
- 0.24%
- Price per share
- $3.37
- Number of holders
- 195
- Value change
- +$36,442,829
- Number of buys
- 114
- Number of sells
- 63
Quarterly Holders Quick Answers
What is CUSIP 46333X108?
CUSIP 46333X108 identifies IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value in SEC institutional holdings data.
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Related Filing Research
- Latest 13F filings for newly reported positions.
- Latest Schedule 13D/13G reports for ownership changes outside 13F cadence.
- Latest 10-Q/10-K reports for financial context tied to this issuer.
- Recent insider transactions for executive and insider activity.
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Recent filing periods for CUSIP 46333X108:
Top shareholders of IRWD - IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| ARMISTICE CAPITAL, LLC |
13D/G
13F
|
Company |
9.8%
|
16,025,000
|
$82,368,500 | +$11,950,500 | 31 Dec 2025 | |
| VANGUARD GROUP INC |
13F
13D/G
|
Company · The Vanguard Group |
10%
from 13D/G
|
16,072,006
|
$21,054,327 | — | 30 Sep 2025 | |
| Sarissa Capital Management LP |
13F
|
Company |
9.8%
|
15,919,435
|
$20,854,460 | — | 30 Sep 2025 | |
| BlackRock, Inc. |
13F
13D/G
|
Company |
7.1%
from 13D/G
|
12,062,558
|
$15,801,953 | — | 30 Sep 2025 | |
| BANK OF AMERICA CORP /DE/ |
13D/G
13F
|
Company |
7.4%
|
11,986,267
|
$15,702,010 | $0 | 30 Sep 2025 | |
| RENAISSANCE TECHNOLOGIES LLC |
13F
13D/G
|
Company |
5.4%
from 13D/G
|
8,352,173
|
$10,941,347 | — | 30 Sep 2025 | |
| ACADIAN ASSET MANAGEMENT LLC |
13F
|
Company |
4%
|
6,502,493
|
$8,505,000 | — | 30 Sep 2025 | |
| Kynam Capital Management, LP |
13F
|
Company |
3.4%
|
5,466,825
|
$7,161,541 | — | 30 Sep 2025 | |
| AQR CAPITAL MANAGEMENT LLC |
13F
|
Company |
3.3%
|
5,378,535
|
$7,045,881 | — | 30 Sep 2025 | |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC |
13F
|
Company |
3%
|
4,917,336
|
$6,441,710 | — | 30 Sep 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
2.2%
|
3,614,987
|
$4,736,657 | — | 30 Sep 2025 | |
| TWO SIGMA ADVISERS, LP |
13F
|
Company |
2%
|
3,316,500
|
$4,344,615 | — | 30 Sep 2025 | |
| Jason Rickard |
3/4/5
|
SVP, Chief Operating Officer |
—
mixed-class rows
|
398,150
mixed-class rows
|
$4,210,976 | — | 08 Mar 2023 | |
| BARCLAYS PLC |
13D/G
13F
|
Company |
2%
|
3,167,713
|
$4,149,704 | -$10,435,649 | 30 Sep 2025 | |
| STATE STREET CORP |
13F
13D/G
|
Company · STATE STREET CORPORATION |
2.2%
from 13D/G
|
3,156,307
|
$4,134,762 | — | 30 Sep 2025 | |
| MARSHALL WACE, LLP |
13F
|
Company |
1.9%
|
3,144,139
|
$4,118,822 | — | 30 Sep 2025 | |
| Qube Research & Technologies Ltd |
13F
|
Company |
1.7%
|
2,806,910
|
$3,677,052 | — | 30 Sep 2025 | |
| TWO SIGMA INVESTMENTS, LP |
13F
|
Company |
1.6%
|
2,534,511
|
$3,320,209 | — | 30 Sep 2025 | |
| Edward P. Owens |
3/4/5
|
Director |
—
class O/S missing
|
281,720
|
$3,152,447 | — | 02 Jun 2021 | |
| JANE STREET GROUP, LLC |
13F
|
Company |
1.4%
|
2,321,095
|
$3,040,635 | — | 30 Sep 2025 | |
| Connor, Clark & Lunn Investment Management Ltd. |
13F
|
Company |
1.3%
|
2,161,818
|
$2,831,982 | — | 30 Sep 2025 | |
| FEDERATED HERMES, INC. |
13F
|
Company |
1.3%
|
2,157,104
|
$2,825,806 | — | 30 Sep 2025 | |
| JACOBS LEVY EQUITY MANAGEMENT, INC |
13F
|
Company |
1.2%
|
1,920,530
|
$2,515,894 | — | 30 Sep 2025 | |
| DEUTSCHE BANK AG\ |
13F
|
Company |
0.94%
|
1,527,229
|
$2,000,670 | — | 30 Sep 2025 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.82%
|
1,340,906
|
$1,756,587 | — | 30 Sep 2025 | |
| Pacer Advisors, Inc. |
13D/G
|
Pacer US Small Cap Cash Cows ETF |
1.1%
|
1,789,098
|
$1,574,406 | -$8,748,672 | 31 Mar 2025 | |
| LOS ANGELES CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.69%
|
1,130,052
|
$1,480,368 | — | 30 Sep 2025 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.67%
|
1,084,367
|
$1,420,521 | — | 30 Sep 2025 | |
| Sravan Kumar Emany |
3/4/5
|
SVP, COO and CFO |
—
class O/S missing
|
309,572
|
$1,263,054 | — | 18 Nov 2024 | |
| Andrew Davis |
3/4/5
|
SVP, Chief Business Officer |
—
class O/S missing
|
284,685
|
$1,161,515 | — | 18 Nov 2024 | |
| UBS Group AG |
13F
|
Company |
0.5%
|
811,664
|
$1,063,279 | — | 30 Sep 2025 | |
| Lawrence S. Olanoff |
3/4/5
|
Director |
—
class O/S missing
|
91,395
|
$1,022,710 | — | 02 Jun 2021 | |
| SEI INVESTMENTS CO |
13F
|
Company |
0.42%
|
683,604
|
$895,518 | — | 30 Sep 2025 | |
| IEQ CAPITAL, LLC |
13F
|
Company |
0.41%
|
661,698
|
$866,824 | — | 30 Sep 2025 | |
| CITADEL ADVISORS LLC |
13F
|
Company |
0.4%
|
644,046
|
$843,701 | — | 30 Sep 2025 | |
| FMR LLC |
13F
|
Company |
0.34%
|
559,946
|
$733,530 | — | 30 Sep 2025 | |
| HIGHBRIDGE CAPITAL MANAGEMENT LLC |
13F
|
Company |
0.33%
|
537,252
|
$703,800 | — | 30 Sep 2025 | |
| Bank of New York Mellon Corp |
13F
|
Company |
0.31%
|
503,078
|
$659,032 | — | 30 Sep 2025 | |
| MORGAN STANLEY |
13F
|
Company |
0.29%
|
477,100
|
$625,001 | — | 30 Sep 2025 | |
| Mark G. Currie |
3/4/5
|
Director |
0.38%
|
613,419
|
$570,479 | — | 10 Jun 2025 | |
| D. E. Shaw & Co., Inc. |
13F
|
Company |
0.23%
|
372,270
|
$487,674 | — | 30 Sep 2025 | |
| Invesco Ltd. |
13F
|
Company |
0.23%
|
366,532
|
$480,156 | — | 30 Sep 2025 | |
| State of Wyoming |
13F
|
Company |
0.22%
|
362,407
|
$474,753 | — | 30 Sep 2025 | |
| Robeco Institutional Asset Management B.V. |
13F
|
Company |
0.21%
|
342,998
|
$449,327 | — | 30 Sep 2025 | |
| Cerity Partners LLC |
13F
|
Company |
0.21%
|
339,048
|
$444,153 | — | 30 Sep 2025 | |
| Russell Investments Group, Ltd. |
13F
|
Company |
0.2%
|
326,567
|
$429,282 | — | 30 Sep 2025 | |
| GSA CAPITAL PARTNERS LLP |
13F
|
Company |
0.19%
|
309,529
|
$405,000 | — | 30 Sep 2025 | |
| ROYCE & ASSOCIATES LP |
13F
|
Company |
0.18%
|
300,619
|
$393,811 | — | 30 Sep 2025 | |
| Tidal Investments LLC |
13F
|
Company |
0.18%
|
294,236
|
$385,449 | — | 30 Sep 2025 | |
| MILLENNIUM MANAGEMENT LLC |
13F
|
Company |
0.15%
|
250,119
|
$327,656 | — | 30 Sep 2025 |
Institutional Holders of IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD) as of Q4 2025
As of 31 Dec 2025,
IRONWOOD PHARMACEUTICALS INC - Class A Common Stock, $0.001 par value (IRWD) was held by
195 institutional
shareholders
that filed Form 13F with the SEC.
Together, they reported ownership of
153,956,131 shares.
The largest 10 holders included
ARMISTICE CAPITAL, LLC, VANGUARD GROUP INC, Sarissa Capital Management LP, BlackRock, Inc., BANK OF AMERICA CORP /DE/, RENAISSANCE TECHNOLOGIES LLC, ACADIAN ASSET MANAGEMENT LLC, CHARLES SCHWAB INVESTMENT MANAGEMENT INC, AQR CAPITAL MANAGEMENT LLC, and MARSHALL WACE, LLP.
This page lists
195
institutional shareholders reporting positions in this security
for the Q4 2025 filing period.
| Investor | Option | Weight % | Change % | Value $ | * Price | Shares | Share Change | Activity | Report Period |
|---|
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
160
Q4 2025 holders
195
Holder diff
35
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 Value $ | Q4 2025 Value $ | Value Diff $ | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.
An asterisk sign (*) next to the price indicates that the price is likely invalid.