Who owns IRWDWhat IRWD owns — n/a

Who owns IRONWOOD PHARMACEUTICALS INC?

Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.

Institutional ownership of IRWD from SEC Form 13F filings across 212 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.

As of the 2026-06-30 reporting period, 212 institutions disclosed 160.6M shares of IRONWOOD PHARMACEUTICALS INC worth $675.8M — about 97.7% of shares outstanding; the largest disclosed holder is BlackRock, Inc.. Source: SEC Form 13F filings, parsed by EvidInvest.

212

13F holders

$675.8M

value, 2026 filers

97.7%

of shares outstanding (160.6M sh)

new positions (2026 filers)

Top institutional holders

ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of IRWD's shares outstanding

#	Manager	Shares	Value	% of fund	% of co.	Δ shares QoQ
1	BlackRock, Inc.	17.8M	$74.9M	0.0%	10.8%	+33.1%
2	ARMISTICE CAPITAL, LLC	13.9M	$58.7M	0.7%	8.5%	-7.3%
3	Sarissa Capital Management LP	9.2M	$38.7M	21.7%	5.6%	0.0%
4	STATE STREET CORP	8.8M	$37.1M	0.0%	5.4%	+18.1%
5	BANK OF AMERICA CORP /DE/	8.7M	$36.6M	0.0%	5.3%	0.0%
6	RENAISSANCE TECHNOLOGIES LLC	8.0M	$33.7M	0.0%	4.9%	-0.8%
7	VANGUARD CAPITAL MANAGEMENT LLC	6.6M	$27.8M	0.0%	4%	+8.4%
8	AQR CAPITAL MANAGEMENT LLC	6.5M	$27.2M	0.0%	3.9%	-14.2%
9	ACADIAN ASSET MANAGEMENT LLC	5.9M	$24.6M	0.0%	3.6%	-11.0%
10	VANGUARD PORTFOLIO MANAGEMENT LLC	5.5M	$23.2M	0.0%	3.4%	-17.5%
11	GEODE CAPITAL MANAGEMENT, LLC	4.8M	$20.3M	0.0%	2.9%	+6.3%
12	TWO SIGMA INVESTMENTS, LP	4.6M	$19.2M	0.0%	2.8%	-22.1%
13	MARSHALL WACE, LLP	4.3M	$18.1M	0.0%	2.6%	-5.2%
14	JACOBS LEVY EQUITY MANAGEMENT, INC	4.1M	$17.1M	0.1%	2.5%	+11.9%
15	GOLDMAN SACHS GROUP INC	3.3M	$14.0M	0.0%	2%	+23.2%
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	3.3M	$13.9M	0.0%	2%	-30.3%
17	FEDERATED HERMES, INC.	3.2M	$13.6M	0.0%	2%	-3.5%
18	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	3.0M	$12.7M	0.0%	1.8%	-11.2%
19	DIMENSIONAL FUND ADVISORS LP	2.5M	$10.6M	0.0%	1.5%	+21.2%
20	MACKENZIE FINANCIAL CORP	2.4M	$10.0M	0.0%	1.4%	+322.7%
21	MORGAN STANLEY	1.9M	$7.8M	0.0%	1.1%	+125.5%
22	Connor, Clark & Lunn Investment Management Ltd.	1.8M	$7.6M	0.0%	1.1%	-1.3%
23	NORTHERN TRUST CORP	1.4M	$5.8M	0.0%	0.8%	+8.5%
24	Hillsdale Investment Management Inc.	1.3M	$5.3M	0.1%	0.8%	+1.1%
25	WELLS FARGO & COMPANY/MN	1.2M	$5.1M	0.0%	0.7%	+1949.6%

Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.