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Ironwood Pharmaceuticals Ownership | Who Owns Ironwood Pharmaceuticals?

OverviewForecastRevenueFinancialsChartTranscripts

Ironwood Pharmaceuticals Ownership Summary

Ironwood Pharmaceuticals is owned by 92.04% institutional investors, 2.66% insiders, and 5.30% retail investors. 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

TypeName% Inst% Insiders% Retail
StockIronwood Pharmaceuticals92.04%2.66%5.30%
SectorHealthcare Stocks 42.54%10.83%46.63%
IndustrySpecialty & Generic Drug Manufacturers Stocks26.16%11.89%61.94%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Blackrock22.88M14.51%$149.16M
Armistice capital16.15M9.99%$21.16M
Vanguard group16.07M9.94%$21.05M
Sarissa capital management lp15.92M9.84%$20.85M
Blackrock funding, inc. /de12.06M7.46%$15.80M
Renaissance8.35M5.16%$10.94M
Acadian asset management6.50M4.02%$8.51M
Kynam capital management, lp5.47M3.38%$7.16M
Charles schwab investment management4.92M3.04%$6.44M
Jacobs levy equity management4.36M2.76%$28.42M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Sarissa capital management lp15.92M11.56%$20.85M
Kynam capital management, lp5.47M0.53%$7.16M
Armistice capital16.15M0.31%$21.16M
Jacobs levy equity management4.36M0.12%$28.42M
State of wyoming362.41K0.05%$474.75K
Gsa capital partners llp309.53K0.03%$405.00K
First dallas securities11.25K0.03%$73.35K
Highbridge capital management537.25K0.03%$703.80K
Artal group110.53K0.02%$720.67K
Acadian asset management6.50M0.01%$8.51M

Top Buyers

HolderShares% AssetsChange
Millennium management2.18M0.00%1.25M
Charles schwab investment management4.92M0.00%1.25M
Jane street group2.32M0.00%575.97K
Highbridge capital management537.25K0.03%537.25K
Ubs group811.66K0.00%511.55K

Top Sellers

HolderShares% AssetsChange
Braidwell lp---6.62M
Lsv asset management---2.75M
Brown capital management---2.58M
Pacer advisors---1.79M
Point72 asset management---1.53M

New Positions

HolderShares% AssetsChangeValue
Highbridge capital management537.25K0.03%537.25K$703.80K
Norges bank252.29K0.00%252.29K$1.12M
Srs capital advisors143.39K0.00%143.39K$187.84K
Cubist systematic strategies53.99K0.00%53.99K$70.73K
Hrt financial lp39.84K0.00%39.84K$52.00K

Sold Out

HolderChange
National bank of canada /fi/-1.00
Natixis-2.00
Sjs investment consulting-5.00
Jfs wealth advisors-10.00
Mendota financial group-11.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Sep 30, 20251608.84%148,842,9659.30%921.30%829.33%43-4.44%
Jun 30, 2025153-24.26%146,234,9095.06%901.21%76-27.62%49-20.97%
Mar 31, 2025201-11.45%155,281,777-5.40%960.91%104-11.86%62-18.42%
Dec 31, 2024213-3.62%155,039,542-4.94%970.93%1104.76%71-7.79%
Sep 30, 2024220-4.76%163,072,766-4.90%1020.86%104-9.57%77-2.53%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
iShares Core S&P Small-Cap ETF9.06M5.66%-
Vanguard US Total Market Shares ETF4.18M2.59%-
Vanguard Total Stock Mkt Idx Inv4.10M2.52%-90.46K
iShares Russell 2000 ETF3.78M2.32%-
SPDR® S&P Biotech ETF2.51M1.57%-15.31K
Vanguard Strategic Equity Inv2.45M1.51%-
Vanguard Explorer Inv2.23M1.38%-
Schwab Fundamental U.S. Small CompanyETF2.17M1.34%8.69K
Vanguard Small Cap Index1.74M1.09%1.41K
Fidelity Small Cap Index1.60M0.98%153.58K

Recent Insider Transactions

DateNameRoleActivityValue
Nov 17, 2025Gaskins Tammi L Chief Commercial OfficerSell$19.97K
Aug 11, 2025Gaskins Tammi L Chief Commercial OfficerSell$1.11K
Aug 11, 2025John Minardo Chief Legal OfficerSell$6.51K
Aug 11, 2025Martini Gregory S. Chief Financial OfficerSell$1.06K
Aug 11, 2025Silver Ronald Principal Accounting OfficerSell$2.39K

Insider Transactions Trends

DateBuySell
2025 Q4-1
2025 Q3-4
2025 Q2-2
2025 Q1-5
2024 Q4-2

IRWD Ownership FAQ

Who Owns Ironwood Pharmaceuticals?

Ironwood Pharmaceuticals shareholders are primarily institutional investors at 92.04%, followed by 2.66% insiders and 5.30% retail investors. The average institutional ownership in Ironwood Pharmaceuticals's industry, Specialty & Generic Drug Manufacturers Stocks, is 26.16%, which Ironwood Pharmaceuticals exceeds.

Who owns the most shares of Ironwood Pharmaceuticals?

Ironwood Pharmaceuticals’s largest shareholders are Blackrock (22.88M shares, 14.51%), Armistice capital (16.15M shares, 9.99%), and Vanguard group (16.07M shares, 9.94%). Together, they hold 34.43% 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 11.56% of its assets in 15.92M Ironwood Pharmaceuticals shares, valued at 20.85M$.

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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