Ionis Pharmaceuticals Ownership | Who Owns Ionis Pharmaceuticals?
Ionis Pharmaceuticals Ownership Summary
Ionis Pharmaceuticals is owned by 106.57% institutional investors, 0.78% insiders. Fmr is the largest institutional shareholder, holding 15.27% of IONS shares. Fidelity Growth Compy Commingled Pl S is the top mutual fund, with 6.84% of its assets in Ionis Pharmaceuticals shares.
IONS Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Ionis Pharmaceuticals | 106.57% | 0.78% | -7.35% |
| Sector | Healthcare Stocks | 488.17% | 11.08% | -399.26% |
| Industry | Biotech Stocks | 306.59% | 11.10% | -217.69% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Fmr | 22.69M | 15.27% | $793.22M |
| Vanguard group | 16.47M | 11.09% | $575.88M |
| T. rowe price investment management | 16.05M | 10.08% | $634.09M |
| Capital world investors | 12.54M | 7.88% | $495.46M |
| Blackrock | 10.32M | 7.09% | $491.90M |
| Blackrock funding, inc. /de | 10.90M | 6.85% | $430.54M |
| Wellington management group llp | 8.67M | 5.84% | $303.18M |
| Bellevue group | 7.85M | 4.93% | $310.28M |
| Deep track capital, lp | 4.89M | 3.07% | $193.26M |
| State street | 4.19M | 2.88% | $199.72M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Great point partners | 500.00K | 12.84% | $19.75M |
| Tweedy, browne | 2.89M | 10.60% | $114.26M |
| Bellevue group | 7.85M | 6.84% | $310.28M |
| Deep track capital, lp | 4.89M | 6.20% | $193.26M |
| Superstring capital management lp | 98.27K | 4.60% | $3.88M |
| Sector gamma as | 285.84K | 3.69% | $11.29M |
| Orion investment | 217.37K | 3.04% | $8.59M |
| Exome asset management | 121.12K | 3.02% | $4.79M |
| Privium fund management b.v. | 247.27K | 2.85% | $11.16M |
| Bvf inc/il | 1.91M | 2.70% | $75.60M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Adage capital partners gp | 3.80M | 0.25% | 2.72M |
| Ubs group | 1.92M | 0.01% | 1.75M |
| Norges bank | 1.71M | 0.01% | 1.71M |
| Vanguard group | 16.47M | 0.01% | 1.42M |
| Polar capital | 1.00M | 0.21% | 1.00M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Orbimed advisors | - | - | -2.54M |
| Clearbridge investments | - | - | -1.62M |
| Logos global management lp | - | - | -750.00K |
| Camber capital management lp | - | - | -725.00K |
| Man group | 8.31K | 0.00% | -587.95K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 1.71M | 0.01% | 1.71M | $59.95M |
| Polar capital | 1.00M | 0.21% | 1.00M | $39.51M |
| Balyasny asset management | 768.65K | 0.05% | 768.65K | $30.37M |
| Massachusetts financial services co /ma/ | 519.18K | 0.01% | 519.18K | $20.51M |
| Great lakes advisors | 399.65K | 0.13% | 399.65K | $15.79M |
Sold Out
| Holder | Change |
|---|---|
| Activest wealth management | -1.00 |
| Mv capital management | -3.00 |
| Hexagon capital partners | -9.00 |
| Voisard asset management group | -10.00 |
| Central trust | -15.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2025 | 379 | 3.55% | 169,594,655 | 1.94% | 106 | 0.97% | 201 | 28.85% | 108 | -14.29% |
| Mar 31, 2025 | 15 | -96.08% | 14,001,670 | -91.30% | 8 | 0.08% | 6 | -96.65% | 6 | -94.92% |
| Dec 31, 2024 | 235 | -38.48% | 100,254,792 | -35.75% | 67 | 0.61% | 111 | -39.34% | 73 | -31.78% |
| Sep 30, 2024 | 378 | 0.27% | 156,005,896 | 8.92% | 104 | 1.08% | 182 | 3.41% | 106 | -17.83% |
| Jun 30, 2024 | 375 | -2.60% | 143,227,487 | 1.66% | 98 | 1.02% | 176 | 2.92% | 127 | 0.79% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Fidelity Growth Compy Commingled Pl S | 10.90M | 6.84% | 13.61K |
| Fidelity Growth Compy Commingled Pl O | 9.71M | 6.16% | 90.97K |
| BB Biotech AG Ord | 7.85M | 4.97% | - |
| Fidelity Growth Company Fund | 7.75M | 4.86% | 78.90K |
| T. Rowe Price Mid-Cap Growth | 5.99M | 3.77% | -4.50K |
| T. Rowe Price US Mid-Cap Growth Equity | 5.99M | 3.77% | 300.20K |
| Vanguard Total Stock Mkt Idx Inv | 4.77M | 2.99% | -99.81K |
| American Funds SMALLCAP World A | 4.57M | 2.87% | 108.08K |
| Vanguard US Total Market Shares ETF | 4.50M | 2.83% | 256.36K |
| Vanguard Health Care Inv | 3.99M | 2.50% | -1.74M |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Sep 09, 2025 | Baroldi Joseph | EVP, Chief Business Officer | Sell | $742.84K |
| Sep 09, 2025 | O'NEIL PATRICK R. | EVP CLO & General Counsel | Sell | $64.56K |
| Sep 05, 2025 | Baroldi Joseph | EVP, Chief Business Officer | Sell | $15.50K |
| Sep 05, 2025 | BENNETT C FRANK | EVP, Chief Scientific Officer | Sell | $357.58K |
| Sep 02, 2025 | Swayze Eric | EVP Research | Sell | $492.20K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q3 | - | 35 |
| 2025 Q2 | 1 | 3 |
| 2025 Q1 | - | 23 |
| 2024 Q4 | 2 | 4 |
| 2024 Q3 | - | 6 |
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