Ironwood Pharmaceuticals Inc (IRWD) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

0Shares Outstanding

829,148Shares held by institutions

$2,682,294Value of institutional holdings

82.89%Institutional ownership %

1.34%Shares Changed QoQ

155No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Ironwood Pharmaceuticals Inc (NASDAQ:IRWD) has 194 institutional investors with active 13F positions as of December 2025.

These investors collectively held 86.8% of Ironwood Pharmaceuticals's outstanding shares in December 2025, down from 90.5% in September 2025.
They increased total shares held in Ironwood Pharmaceuticals by 0.88% from the prior quarter, while the number of investors in IRWD decreased 12.61% year over year.
Among the 194 funds, 113 bought more Ironwood Pharmaceuticals shares, 51 sold down, and 30 held their ground.
Institutional investors collectively held 154.3Mn shares in Ironwood Pharmaceuticals as of December 2025, up by 1.34Mn shares quarter on quarter, and down 16.21Mn shares year over year.
ARMISTICE CAPITAL, LLC leads ownership in IRWD with 16.02Mn shares as of December 31, 2025, equal to 9.01% of outstanding shares.
The biggest buyers of Ironwood Pharmaceuticals for the quarter ending December 2025 included MARSHALL WACE, LLP (1.28Mn), State Street Corp (1.25Mn), Federated Hermes, Inc. (1.16Mn), Hillsdale Investment Management Inc. (1.16Mn), LAZARD ASSET MANAGEMENT LLC (1.0Mn).
Top sellers of IRWD stock for the quarter ending December 2025 included Bank Of America Corp /De/ (11.87Mn), Qube Research & Technologies Ltd (1.13Mn), AQR CAPITAL MANAGEMENT LLC (655.0K), LOS ANGELES CAPITAL MANAGEMENT LLC (495.72K), CITADEL ADVISORS LLC (420.08K).
Business Quant data shows the 10 biggest positions in Ironwood Pharmaceuticals as of December 2025 are held by ARMISTICE CAPITAL, LLC (16.02Mn), VANGUARD GROUP INC (15.96Mn), Sarissa Capital Management LP (15.92Mn), BlackRock, Inc. (12.78Mn), Bank Of America Corp /De/ (11.52Mn), RENAISSANCE TECHNOLOGIES LLC (8.2Mn), ACADIAN ASSET MANAGEMENT LLC (6.46Mn), CHARLES SCHWAB INVESTMENT MANAGEMENT INC (4.98Mn), AQR CAPITAL MANAGEMENT LLC (4.72Mn), MARSHALL WACE, LLP (4.42Mn).

194 Institutional Holders

829,148 Total Shares Held

Rows:

Download Data

Owner Name	Date	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	722,248	5.99%	$0.00
ARMISTICE CAPITAL, LLC	31 Dec, 2025	-125,000	-0.77%	$0.00
Qube Research & Technologies Ltd	31 Dec, 2025	-1,125,681	-40.10%	$0.00
Barclays Plc	31 Dec, 2025	-320,734	-44.94%	$0.00
VANGUARD GROUP INC	31 Dec, 2025	-113,810	-0.71%	$0.00
DIADEMA PARTNERS LP	31 Dec, 2025	683,611	0.00%	$0.00
HSBC HOLDINGS PLC	31 Dec, 2025	46,872	0.00%	$0.00
Sarissa Capital Management LP	31 Dec, 2025	0	0.00%	$0.00
Exome Asset Management LLC	31 Dec, 2025	648,532	0.00%	$0.00
Rockefeller Capital Management L.P.	31 Dec, 2025	434	65.56%	$0.00
Bank Of America Corp /De/	31 Dec, 2025	-11,869,428	-50.74%	$0.00
IEQ CAPITAL, LLC	31 Dec, 2025	-28,438	-4.30%	$0.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	-147,200	-1.76%	$0.00
Walleye Capital LLC	31 Dec, 2025	527,936	0.00%	$0.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	-44,676	-0.69%	$0.00
UBS Group AG	31 Dec, 2025	-301,121	-37.10%	$0.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	58,603	1.19%	$0.00
Range Financial Group LLC	31 Dec, 2025	426,095	0.00%	$0.00
AQR CAPITAL MANAGEMENT LLC	31 Dec, 2025	-655,004	-12.18%	$0.00
Russell Investments Group, Ltd.	31 Dec, 2025	-61,210	-18.74%	$0.00

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