Ironwood Pharmaceuticals Ownership | Who Owns Ironwood Pharmaceuticals?
Ironwood Pharmaceuticals Ownership Summary
Ironwood Pharmaceuticals is owned by 100.25% institutional investors, 3.24% 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 | 100.25% | 3.24% | -3.48% |
| Sector | Healthcare Stocks | 244.59% | 12.11% | -156.70% |
| Industry | Specialty & Generic Drug Manufacturers Stocks | 37.12% | 13.99% | 48.89% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 22.88M | 14.51% | $149.16M |
| Blackrock funding, inc. /de | 17.79M | 10.88% | $74.89M |
| Vanguard group | 15.96M | 9.84% | $53.78M |
| Armistice capital | 13.93M | 8.52% | $58.65M |
| Sarissa capital management lp | 9.19M | 5.62% | $38.68M |
| State street | 8.81M | 5.39% | $37.09M |
| Bank of america corp /de/ | 8.68M | 5.31% | $36.56M |
| Renaissance | 7.99M | 4.89% | $33.65M |
| Vanguard capital management | 6.61M | 4.04% | $27.82M |
| Aqr capital management | 6.47M | 3.96% | $27.22M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Sarissa capital management lp | 9.19M | 21.75% | $38.68M |
| Cm management | 350.00K | 0.94% | $1.47M |
| Armistice capital | 13.93M | 0.72% | $58.65M |
| Kynam capital management, lp | 5.47M | 0.53% | $7.16M |
| Virtus investment advisers | 318.60K | 0.31% | $1.34M |
| Optimist retirement group | 102.05K | 0.17% | $429.65K |
| Globeflex capital l p | 259.81K | 0.14% | $1.09M |
| Hillsdale investment management | 1.25M | 0.12% | $5.26M |
| Inspire investing | 630.07K | 0.11% | $2.65M |
| Gsa capital partners llp | 259.51K | 0.07% | $1.09M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock funding, inc. /de | 17.79M | 0.00% | 4.43M |
| Sixth street partners management company | 3.30M | 0.00% | 3.30M |
| Mackenzie financial | 2.37M | 0.01% | 1.81M |
| State street | 8.81M | 0.00% | 1.35M |
| Wells fargo & company/mn | 1.21M | 0.00% | 1.15M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Braidwell lp | - | - | -6.62M |
| Brown capital management | - | - | -2.58M |
| Point72 asset management | - | - | -1.53M |
| Charles schwab investment management | 3.30M | 0.00% | -1.44M |
| Glenmede trust co na | - | - | -1.40M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Sixth street partners management company | 3.30M | 0.00% | 3.30M | $13.90M |
| Hrt financial lp | 577.34K | 0.00% | 577.34K | $2.43M |
| Cwa asset management group | 290.37K | 0.04% | 290.37K | $1.22M |
| Norges bank | 252.29K | 0.00% | 252.29K | $1.12M |
| Cubist systematic strategies | 53.99K | 0.00% | 53.99K | $70.73K |
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 % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | 219 | -6.41% | 163,855,186 | 1.48% | 100 | 1.01% | 98 | -31.47% | 83 | 53.70% |
| 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% |
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 | 5.41M | 3.28% | 12.43K |
| Vanguard Total Stock Mkt Idx Inv | 4.78M | 2.90% | 446.70K |
| Vanguard Morn Total Stk Mkt Idx Investor | 4.78M | 2.90% | 446.70K |
| Vanguard MStar Total Stk Mkt Idx Invest | 4.78M | 2.89% | - |
| Vanguard US Total Market Shares ETF | 4.18M | 2.59% | - |
| iShares Russell 2000 ETF | 4.17M | 2.52% | -74.02K |
| SPDR® S&P Biotech ETF | 2.51M | 1.57% | -15.31K |
| Vanguard Small Cap Index | 1.74M | 1.09% | 1.41K |
| Vanguard Strategic Equity Inv | 1.75M | 1.06% | -350.74K |
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 |
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