Ironwood Pharmaceuticals Ownership | Who Owns Ironwood Pharmaceuticals?
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 | 35.58% | 11.87% | 52.55% |
| Industry | Specialty & Generic Drug Manufacturers Stocks | 20.67% | 13.90% | 65.43% |
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 |
| Range financial group | 433.26K | 0.51% | $1.52M |
| 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 |
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 |
| Wedge capital management l l p/nc | 540.49K | 0.04% | 540.49K | $1.90M |
| Inspire investing | 509.94K | 0.15% | 509.94K | $1.79M |
| Bnp paribas asset management | 375.29K | 0.00% | 375.29K | $1.32M |
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 | 4.43M | 2.69% | -44.88K |
| Vanguard Total Stock Mkt Idx Inv | 4.33M | 2.63% | - |
| Vanguard US Total Market Shares ETF | 4.18M | 2.59% | - |
| iShares Russell 2000 ETF | 3.80M | 2.31% | 32.05K |
| Schwab Fundamental U.S. Small CompanyETF | 2.85M | 1.73% | - |
| 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 Explorer Inv | 1.63M | 0.99% | -602.51K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Mar 17, 2026 | DENNER ALEXANDER J | - | Sell | $19.20K |
| Mar 17, 2026 | DENNER ALEXANDER J | - | Sell | $20.51M |
| Feb 23, 2026 | John Minardo | Chief Legal Officer | Sell | $66.44K |
| Feb 24, 2026 | John Minardo | Chief Legal Officer | Sell | $69.73K |
| Feb 23, 2026 | Shetzline Michael | SVP, CMO, Head-Res&Drug | Sell | $59.32K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | - |
| 2026 Q1 | - | 15 |
| 2025 Q4 | - | 1 |
| 2025 Q3 | - | 4 |
| 2025 Q2 | - | 2 |
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