Ironwood Pharmaceuticals Ownership | Who Owns Ironwood Pharmaceuticals?
Ironwood Pharmaceuticals Ownership Summary
Ironwood Pharmaceuticals is owned by 90.42% institutional investors, 2.66% insiders, and 6.92% 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
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Ironwood Pharmaceuticals | 90.42% | 2.66% | 6.92% |
| Sector | Healthcare Stocks | 488.17% | 11.08% | -399.26% |
| Industry | Specialty & Generic Drug Manufacturers Stocks | 43.51% | 11.55% | 44.95% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 22.88M | 14.51% | $149.16M |
| Vanguard group | 19.54M | 12.23% | $86.56M |
| Armistice capital | 16.15M | 9.99% | $11.58M |
| Sarissa capital management lp | 15.92M | 9.84% | $11.42M |
| Blackrock funding, inc. /de | 12.02M | 7.43% | $8.62M |
| State street | 9.24M | 5.86% | $60.26M |
| Renaissance | 9.07M | 5.68% | $40.16M |
| Acadian asset management | 6.55M | 4.05% | $4.68M |
| Kynam capital management, lp | 5.47M | 3.38% | $3.92M |
| Morgan stanley | 4.86M | 3.08% | $31.69M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Sarissa capital management lp | 15.92M | 7.40% | $11.42M |
| Kynam capital management, lp | 5.47M | 0.42% | $3.92M |
| Armistice capital | 16.15M | 0.20% | $11.58M |
| Jacobs levy equity management | 4.36M | 0.12% | $28.42M |
| Renaissance | 9.07M | 0.06% | $40.16M |
| Inspire investing | 552.42K | 0.04% | $396.20K |
| First dallas securities | 11.25K | 0.03% | $73.35K |
| State of wyoming | 41.86K | 0.02% | $185.43K |
| Artal group | 110.53K | 0.02% | $720.67K |
| China universal asset management | 33.93K | 0.01% | $150.32K |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Acadian asset management | 6.55M | 0.01% | 3.90M |
| Marshall wace, llp | 3.99M | 0.00% | 3.44M |
| Armistice capital | 16.15M | 0.20% | 2.45M |
| Morgan stanley | 4.86M | 0.00% | 2.18M |
| Millennium management | 2.18M | 0.00% | 1.25M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Braidwell lp | - | - | -6.62M |
| State street | 9.24M | 0.00% | -4.67M |
| Brown capital management | - | - | -2.58M |
| Vanguard group | 19.54M | 0.00% | -2.50M |
| Pacer advisors | - | - | -1.79M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Federated hermes | 370.48K | 0.00% | 370.48K | $1.64M |
| Norges bank | 252.29K | 0.00% | 252.29K | $1.12M |
| Algert global | 122.58K | 0.00% | 122.58K | $88.00K |
| Oversea-chinese banking | 35.02K | 0.00% | 35.02K | $25.11K |
| Colony group | 34.55K | 0.00% | 34.55K | $24.78K |
Sold Out
| Holder | Change |
|---|---|
| Natixis | -2.00 |
| Sjs investment consulting | -5.00 |
| Jfs wealth advisors | -10.00 |
| Mendota financial group | -11.00 |
| Dinuzzo private wealth | -15.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| 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% |
| Dec 31, 2024 | 213 | -3.62% | 155,039,542 | -4.94% | 97 | 0.93% | 110 | 4.76% | 71 | -7.79% |
| Sep 30, 2024 | 220 | -4.76% | 163,072,766 | -4.90% | 102 | 0.86% | 104 | -9.57% | 77 | -2.53% |
| Jun 30, 2024 | 231 | -19.23% | 171,479,228 | -0.14% | 108 | 0.92% | 115 | -22.30% | 79 | -3.66% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 9.06M | 5.66% | - |
| Vanguard US Total Market Shares ETF | 4.18M | 2.59% | - |
| Vanguard Total Stock Mkt Idx Inv | 4.10M | 2.52% | -90.46K |
| iShares Russell 2000 ETF | 3.69M | 2.28% | -70.25K |
| SPDR® S&P Biotech ETF | 2.51M | 1.57% | -15.31K |
| Vanguard Strategic Equity Inv | 2.45M | 1.51% | - |
| Vanguard Explorer Inv | 2.23M | 1.38% | - |
| Schwab Fundamental U.S. Small CompanyETF | 2.14M | 1.32% | - |
| Vanguard Small Cap Index | 1.74M | 1.09% | 1.41K |
| Vanguard Institutional Extnd Mkt Idx Tr | 1.55M | 0.95% | -704.83K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Aug 11, 2025 | Gaskins Tammi L | Chief Commercial Officer | Sell | $1.11K |
| Aug 11, 2025 | John Minardo | Chief Legal Officer | Sell | $6.51K |
| Aug 11, 2025 | Martini Gregory S. | Chief Financial Officer | Sell | $1.06K |
| Aug 11, 2025 | Silver Ronald | Principal Accounting Officer | Sell | $2.39K |
| May 16, 2025 | MCCOURT Thomas A | Chief Executive Officer | Sell | $7.74K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q3 | - | 4 |
| 2025 Q2 | - | 2 |
| 2025 Q1 | - | 5 |
| 2024 Q4 | - | 2 |
| 2024 Q3 | - | 2 |
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