Ironwood Pharmaceuticals IRWD Institutional Ownership

NASDAQ IRWD

$4.07 -0.10 (-2.40%)

As of: Sep 9, 2026 · 3:59 PM EDT

Institutions by Trading Activity

209 Institutions

Increased 100 47.8%

Unchanged 29 13.9%

Reduced 80 38.3%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

99.51%

▲+1.70 pp QoQ

Shares Held by Institutions

163.61Mn

of 164.41Mn outstanding

▲+4.01% QoQ

Shares Outstanding

164.41Mn

799.15K held outside 13F filers

Institutional Investors

209

filed 13F for Jun 2026

▼-14 vs prior quarter

Net Shares Added (QoQ)

+6.31Mn

accumulated since last quarter

Value of Holdings

$696.96Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Ironwood Pharmaceuticals Inc (NASDAQ:IRWD) appears in 209 institutional 13F filings for the quarter ending June 2026.

These investors held 99.5% of outstanding shares in June 2026, up from 97.8% in March 2026.
Their total shares held in IRWD increased 4.01% from the prior quarter, while the number of investors in Ironwood Pharmaceuticals increased 33.97% year over year.
Of these 209 holders, 100 added to their stakes in Ironwood Pharmaceuticals, 80 trimmed positions, and 29 made no changes.
In total, institutional investors held 163.61Mn shares in Ironwood Pharmaceuticals as of June 2026, up by 6.31Mn shares quarter on quarter, and up 17.01Mn shares year over year.
BlackRock, Inc. leads ownership in IRWD with 17.79Mn shares as of June 30, 2026, equal to 10.82% of outstanding shares.
The biggest buyers of Ironwood Pharmaceuticals for the quarter ending June 2026 included BlackRock, Inc. (4.43Mn), Sixth Street Partners Management Company, L.P. (3.3Mn), MACKENZIE FINANCIAL CORP (1.81Mn), State Street Corp (1.35Mn), Wells Fargo & Company/Mn (1.15Mn).
The largest sellers of Ironwood Pharmaceuticals for the quarter ending June 2026 were CHARLES SCHWAB INVESTMENT MANAGEMENT INC (1.44Mn), SUSQUEHANNA INTERNATIONAL GROUP, LLP (1.34Mn), TWO SIGMA INVESTMENTS, LP (1.29Mn), Qube Research & Technologies Ltd (1.24Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.17Mn).
Business Quant data shows the 10 biggest positions in Ironwood Pharmaceuticals as of June 2026 are held by BlackRock, Inc. (17.79Mn), ARMISTICE CAPITAL, LLC (13.93Mn), Sarissa Capital Management LP (9.19Mn), State Street Corp (8.81Mn), Bank Of America Corp /De/ (8.68Mn), RENAISSANCE TECHNOLOGIES LLC (7.99Mn), VANGUARD CAPITAL MANAGEMENT LLC (6.61Mn), AQR CAPITAL MANAGEMENT LLC (6.47Mn), ACADIAN ASSET MANAGEMENT LLC (5.85Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (5.51Mn).

Form 13F Holdings

209 Institutional Holders

Report period 30 Jun, 2026

Total shares held 163.61Mn

Of outstanding 99.51%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	17,788,557	10.82%	▲4,425,627	+33.12%	$74.89Mn
2	ARMISTICE CAPITAL, LLC	0001601086	13,932,000	8.47%	▼1,096,000	-7.29%	$58.65Mn
3	Sarissa Capital Management LP	0001577524	9,188,635	5.59%	0	0.00%	$38.68Mn
4	State Street Corp	0000093751	8,809,601	5.36%	▲1,352,657	+18.14%	$37.09Mn
5	Bank Of America Corp /De/	0000070858	8,683,803	5.28%	▲896	+0.01%	$36.56Mn
6	RENAISSANCE TECHNOLOGIES LLC	0001037389	7,993,226	4.86%	▼67,847	-0.84%	$33.65Mn
7	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	6,608,508	4.02%	▲511,054	+8.38%	$27.82Mn
8	AQR CAPITAL MANAGEMENT LLC	0001167557	6,465,921	3.93%	▼1,069,159	-14.19%	$27.22Mn
9	ACADIAN ASSET MANAGEMENT LLC	0000916542	5,853,331	3.56%	▼723,941	-11.01%	$24.62K
10	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	5,513,355	3.35%	▼1,168,682	-17.49%	$23.21Mn
11	GEODE CAPITAL MANAGEMENT, LLC	0001214717	4,831,657	2.94%	▲288,135	+6.34%	$20.35Mn
12	TWO SIGMA INVESTMENTS, LP	0001179392	4,556,089	2.77%	▼1,292,187	-22.10%	$19.18Mn
13	MARSHALL WACE, LLP	0001318757	4,290,093	2.61%	▼234,971	-5.19%	$18.06Mn
14	JACOBS LEVY EQUITY MANAGEMENT, INC	0000884414	4,065,964	2.47%	▲433,487	+11.93%	$17.12Mn
15	Goldman Sachs Group Inc	0000886982	3,313,808	2.02%	▲623,174	+23.16%	$13.95Mn
16	Sixth Street Partners Management Company, L.P.	0001812095	3,302,242	2.01%	▲3,302,242	0.00%	$13.90Mn
16	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	0000884546	3,302,242	2.01%	▼1,435,615	-30.30%	$13.90Mn
17	Federated Hermes, Inc.	0001056288	3,231,238	1.97%	▼117,568	-3.51%	$13.60Mn
18	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	0001164508	3,017,089	1.84%	▼380,153	-11.19%	$12.70Mn
19	DIMENSIONAL FUND ADVISORS LP	0000354204	2,522,891	1.53%	▲440,836	+21.17%	$10.62Mn

Showing 1 to 20 of 209 holders