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Ironwood Pharmaceuticals Ownership | Who Owns Ironwood Pharmaceuticals?

OverviewForecastRevenueFinancialsChartTranscripts

Ironwood Pharmaceuticals Ownership Summary

Ironwood Pharmaceuticals is owned by 66.47% institutional investors, 2.66% insiders, and 30.87% 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 Pharmaceuticals66.47%2.66%30.87%
SectorHealthcare Stocks 232.01%10.74%-142.75%
IndustrySpecialty & Generic Drug Manufacturers Stocks20.82%11.62%67.56%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Blackrock22.88M14.51%$149.16M
Armistice capital16.15M9.99%$21.16M
Sarissa capital management lp15.92M9.84%$20.85M
Vanguard group15.96M9.84%$53.78M
Blackrock funding, inc. /de12.78M7.88%$43.08M
Renaissance8.20M5.06%$27.65M
Acadian asset management6.46M3.98%$21.75M
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
Range financial group426.10K0.50%$1.44M
Armistice capital16.15M0.31%$21.16M
Gsa capital partners llp571.61K0.17%$1.93M
Jacobs levy equity management4.36M0.12%$28.42M
Hillsdale investment management1.16M0.11%$3.90M
Optimist retirement group59.91K0.09%$201.90K
Entrypoint capital66.63K0.09%$224.53K
Integrated quantitative investments102.65K0.07%$345.94K

Top Buyers

HolderShares% AssetsChange
Millennium management2.18M0.00%1.25M
Charles schwab investment management4.92M0.00%1.25M
Federated hermes3.32M0.02%1.16M
Hillsdale investment management1.16M0.11%1.16M
Blackrock funding, inc. /de12.78M0.00%722.25K

Top Sellers

HolderShares% AssetsChange
Braidwell lp---6.62M
Brown capital management---2.58M
Pacer advisors---1.79M
Point72 asset management---1.53M
Glenmede trust co na---1.40M

New Positions

HolderShares% AssetsChangeValue
Hillsdale investment management1.16M0.11%1.16M$3.90M
Range financial group426.10K0.50%426.10K$1.44M
O'shaughnessy asset management290.28K0.01%290.28K$978.24K
Norges bank252.29K0.00%252.29K$1.12M
Winton group164.34K0.02%164.34K$553.81K

Sold Out

HolderChange
National bank of canada /fi/-1.00
Natixis-2.00
Jfs wealth advisors-10.00
Mendota financial group-11.00
Dinuzzo private wealth-15.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Dec 31, 2025151-10.12%107,820,680-27.61%660.78%85-2.30%38-13.64%
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%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
iShares Core S&P Small-Cap ETF9.06M5.66%-
Vanguard Total Stock Mkt Idx Inv4.33M2.66%-
Vanguard US Total Market Shares ETF4.18M2.59%-
iShares Russell 2000 ETF3.86M2.37%892.14K
Schwab Fundamental U.S. Small CompanyETF3.12M1.92%-2.18K
SPDR® S&P Biotech ETF2.51M1.57%-15.31K
Vanguard Strategic Equity Inv2.45M1.50%-
Vanguard Explorer Inv2.23M1.37%-
Vanguard Small Cap Index1.74M1.09%1.41K
Fidelity Small Cap Index1.64M1.01%-1.95K

Recent Insider Transactions

DateNameRoleActivityValue
Feb 24, 2026John Minardo Chief Legal OfficerSell$69.73K
Feb 23, 2026John Minardo Chief Legal OfficerSell$66.44K
Feb 23, 2026Shetzline Michael SVP, CMO, Head-Res&DrugSell$59.32K
Feb 24, 2026Shetzline Michael SVP, CMO, Head-Res&DrugBuy$62.26K
Feb 23, 2026Gaskins Tammi L Chief Commercial OfficerSell$39.19K

Insider Transactions Trends

DateBuySell
2026 Q1-13
2025 Q4-1
2025 Q3-4
2025 Q2-2
2025 Q1-5

IRWD Ownership FAQ

Who Owns Ironwood Pharmaceuticals?

Ironwood Pharmaceuticals shareholders are primarily institutional investors at 66.47%, followed by 2.66% insiders and 30.87% retail investors. The average institutional ownership in Ironwood Pharmaceuticals's industry, Specialty & Generic Drug Manufacturers Stocks, is 20.82%, 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 Sarissa capital management lp (15.92M shares, 9.84%). Together, they hold 34.34% 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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