Ironwood Pharmaceuticals Ownership | Who Owns Ironwood Pharmaceuticals?

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Ironwood Pharmaceuticals Ownership Summary

Ironwood Pharmaceuticals is owned by 98.65% institutional investors, 2.93% insiders. Blackrock is the largest institutional shareholder, holding 14.51% of IRWD shares. iShares Core S&P Small-Cap ETF is the top mutual fund, with 5.66% of its assets in Ironwood Pharmaceuticals shares.

IRWD Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Ironwood Pharmaceuticals	98.65%	2.93%	-1.58%
Sector	Healthcare Stocks	35.56%	12.08%	52.36%
Industry	Specialty & Generic Drug Manufacturers Stocks	21.33%	14.37%	64.29%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock	22.88M	14.51%	$149.16M
Vanguard group	15.96M	9.84%	$53.78M
Armistice capital	15.03M	9.26%	$52.75M
Blackrock funding, inc. /de	13.36M	8.24%	$46.90M
Sarissa capital management lp	9.19M	5.66%	$32.25M
Renaissance	8.06M	4.97%	$28.29M
Aqr capital management	7.54M	4.65%	$26.45M
State street	7.46M	4.60%	$26.17M
Acadian asset management	6.58M	4.05%	$23.07M
Two sigma investments, lp	5.85M	3.61%	$20.53M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Sarissa capital management lp	9.19M	20.46%	$32.25M
Cm management	350.00K	1.03%	$1.23M
Armistice capital	15.03M	0.94%	$52.75M
Kynam capital management, lp	5.47M	0.53%	$7.16M
Integrated quantitative investments	552.10K	0.35%	$1.94M
Harvest investment services	241.88K	0.16%	$849.00K
Inspire investing	509.94K	0.15%	$1.79M
Optimist retirement group	94.83K	0.15%	$332.86K
Gsa capital partners llp	654.45K	0.14%	$2.30M
Globeflex capital l p	259.81K	0.14%	$911.93K

Top Buyers

Holder	Shares	% Assets	Change
State street	7.46M	0.00%	3.05M
Two sigma investments, lp	5.85M	0.02%	3.00M
Arrowstreet capital, limited partnership	3.40M	0.01%	2.99M
Aqr capital management	7.54M	0.01%	2.81M
Dimensional fund advisors lp	2.08M	0.00%	1.75M

Top Sellers

Holder	Shares	% Assets	Change
Sarissa capital management lp	9.19M	20.46%	-6.73M
Braidwell lp	-	-	-6.62M
Brown capital management	-	-	-2.58M
Jane street group	622.25K	0.00%	-2.20M
Pacer advisors	-	-	-1.79M

New Positions

Holder	Shares	% Assets	Change	Value
Vanguard fiduciary trust	988.63K	0.00%	988.63K	$3.47M
Vanguard global advisers	591.49K	0.00%	591.49K	$2.08M
Inspire investing	509.94K	0.15%	509.94K	$1.79M
Bnp paribas asset management	375.29K	0.00%	375.29K	$1.32M
Cm management	350.00K	1.03%	350.00K	$1.23M

Sold Out

Holder	Change
Natixis	-2.00
Jfs wealth advisors	-10.00
Mendota financial group	-11.00
Dinuzzo private wealth	-15.00
Nelson, van denburg & campbell wealth management group	-26.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	230	12.75%	160,024,936	3.50%	98	1.09%	138	15.00%	54	14.89%
Dec 31, 2025	151	-10.12%	107,820,680	-27.61%	66	0.78%	85	-2.30%	38	-13.64%
Sep 30, 2025	160	8.84%	148,842,965	9.30%	92	1.30%	82	9.33%	43	-4.44%
Jun 30, 2025	153	-24.26%	146,234,909	5.06%	90	1.21%	76	-27.62%	49	-20.97%
Mar 31, 2025	201	-11.45%	155,281,777	-5.40%	96	0.91%	104	-11.86%	62	-18.42%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
iShares Core S&P Small-Cap ETF	9.06M	5.66%	-
State Street® SPDR® S&P® Biotech ETF	5.48M	3.33%	-122.04K
Vanguard Total Stock Mkt Idx Inv	4.78M	2.90%	446.70K
iShares Russell 2000 ETF	4.29M	2.60%	25.44K
Vanguard US Total Market Shares ETF	4.18M	2.59%	-
SPDR® S&P Biotech ETF	2.51M	1.57%	-15.31K
Vanguard Strategic Equity Inv	2.10M	1.28%	-343.65K
Vanguard Small Cap Index	1.74M	1.09%	1.41K
Vanguard Institutional Extnd Mkt Idx Tr	1.68M	1.02%	56.29K
Vanguard Explorer Inv	1.63M	0.99%	-602.51K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jul 07, 2026	Silver Ronald	PFO & PAO	Sell	$578.06K
Jun 16, 2026	McHugh Julie	-	Sell	$80.46K
Mar 17, 2026	DENNER ALEXANDER J	-	Sell	$20.51M
Mar 17, 2026	DENNER ALEXANDER J	-	Sell	$19.20K
Feb 23, 2026	John Minardo	Chief Legal Officer	Sell	$66.44K

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	1
2026 Q2	-	1
2026 Q1	-	15
2025 Q4	-	1
2025 Q3	-	4

IRWD Ownership FAQ

Who Owns Ironwood Pharmaceuticals?

Ironwood Pharmaceuticals shareholders are primarily institutional investors at 98.65%, followed by 2.93% insiders and -1.58% retail investors. The average institutional ownership in Ironwood Pharmaceuticals's industry, Specialty & Generic Drug Manufacturers Stocks, is 21.33%, which Ironwood Pharmaceuticals exceeds.

Who owns the most shares of Ironwood Pharmaceuticals?

Ironwood Pharmaceuticals’s largest shareholders are Blackrock (22.88M shares, 14.51%), Vanguard group (15.96M shares, 9.84%), and Armistice capital (15.03M shares, 9.26%). Together, they hold 33.61% of Ironwood Pharmaceuticals’s total shares outstanding.

Does Blackrock own Ironwood Pharmaceuticals?

Yes, BlackRock owns 14.51% of Ironwood Pharmaceuticals, totaling 22.88M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 149.16M$. In the last quarter, BlackRock decreased its holdings by -1.281M shares, a -5.30% change.

Who is Ironwood Pharmaceuticals’s biggest shareholder by percentage of total assets invested?

Sarissa capital management lp is Ironwood Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 20.46% of its assets in 9.19M Ironwood Pharmaceuticals shares, valued at 32.25M$.

Who is the top mutual fund holder of Ironwood Pharmaceuticals shares?

iShares Core S&P Small-Cap ETF is the top mutual fund holder of Ironwood Pharmaceuticals shares, with 5.66% of its total shares outstanding invested in 9.06M Ironwood Pharmaceuticals shares.

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