Ironwood Pharmaceuticals IRWD Institutional Ownership

NASDAQ IRWD

$3.57 +0.02 (+0.56%)

At close: Oct 22, 2026 · 4:00 PM EDT

Institutions by Trading Activity

208 Institutions

Increased 99 47.6%

Unchanged 29 13.9%

Reduced 80 38.5%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

97.51%

▼-0.31 pp QoQ

Shares Held by Institutions

160.30Mn

of 164.41Mn outstanding

▲+0.27% QoQ

Shares Outstanding

164.41Mn

4.10Mn held outside 13F filers

Institutional Investors

208

filed 13F for Jun 2026

▼-15 vs prior quarter

Net Shares Added (QoQ)

+426.73K

accumulated since last quarter

Value of Holdings

$569.08Mn

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

Updated Oct 11, 2026

Ironwood Pharmaceuticals Inc (NASDAQ:IRWD) counted 208 institutional investors among its 13F-reported shareholders for the quarter ended June 30, 2026.

Together they owned 97.51% of the outstanding stock in Q2 2026, down from 97.81% a quarter earlier.
Total holdings of IRWD shares rose 0.27% from Q1 2026, and the holder count rose 35.06% from Q2 2025.
Of these 208 holders, 99 added to their positions, 80 reduced their stakes and 29 left their positions unchanged.
Altogether, institutional holders owned 160.3Mn IRWD shares at the end of Q2 2026, up 426.73K from the prior quarter and up 14.61Mn from a year earlier.
BlackRock, Inc. was the top holder of Ironwood Pharmaceuticals as of June 30, 2026, with 17.79Mn shares, or 10.82% of shares outstanding.
Among holders that already owned Ironwood Pharmaceuticals, the biggest buyers in Q2 2026 were BlackRock, Inc. (+4.43Mn shares), Mackenzie Financial Corp (+1.81Mn shares), State Street Corp (+1.35Mn shares), Wells Fargo & Company (+1.15Mn shares) and Morgan Stanley (+1.04Mn shares).
Holders that trimmed the most shares of Ironwood Pharmaceuticals in Q2 2026 while keeping a position were Charles Schwab Investment Management Inc (-1.44Mn shares), Susquehanna International Group, LLP (-1.34Mn shares), Two Sigma Investments, LP (-1.29Mn shares), Qube Research & Technologies Ltd (-1.24Mn shares) and Vanguard Portfolio Management LLC (-1.17Mn shares).
Business Quant data shows the 10 biggest positions in Ironwood Pharmaceuticals as of Q2 2026 were held by BlackRock, Inc. (17.79Mn shares), Armistice Capital, LLC (13.93Mn shares), Sarissa Capital Management LP (9.19Mn shares), State Street Corp (8.81Mn shares), Bank of America Corp (8.68Mn shares), Renaissance Technologies LLC (7.99Mn shares), Vanguard Capital Management LLC (6.61Mn shares), AQR Capital Management LLC (6.47Mn shares), Acadian Asset Management LLC (5.85Mn shares) and Vanguard Portfolio Management LLC (5.51Mn shares).

Form 13F Holdings

208 Institutional Holders

Report period 30 Jun, 2026

Total shares held 160.30Mn

Of outstanding 97.51%

#	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	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
20	MACKENZIE FINANCIAL CORP	0000919859	2,367,493	1.44%	▲1,807,459	+322.74%	$9.97Mn

Showing 1 to 20 of 208 holders