Ionis Pharmaceuticals Ownership | Who Owns Ionis Pharmaceuticals?
Ionis Pharmaceuticals Ownership Summary
Ionis Pharmaceuticals is owned by 57.60% institutional investors, 0.72% insiders, and 41.69% retail investors. Dld asset management, lp is the largest institutional shareholder, holding 15.71% of IONS shares. Fidelity Growth Compy Commingled Pl S is the top mutual fund, with 6.67% of its assets in Ionis Pharmaceuticals shares.
IONS Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Ionis Pharmaceuticals | 57.60% | 0.72% | 41.69% |
| Sector | Healthcare Stocks | 232.64% | 10.66% | -143.30% |
| Industry | Biotech Stocks | 382.13% | 10.41% | -292.54% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Dld asset management, lp | 25.00M | 15.71% | $34.63B |
| Fmr | 23.69M | 14.89% | $1.55B |
| Capital world investors | 17.96M | 11.17% | $1.42B |
| Vanguard group | 16.44M | 10.23% | $1.30B |
| T. rowe price investment management | 13.16M | 8.27% | $860.73M |
| Blackrock | 10.32M | 7.09% | $491.90M |
| Blackrock funding, inc. /de | 10.65M | 6.62% | $842.35M |
| Wellington management group llp | 6.59M | 4.14% | $431.04M |
| Lombard odier asset management (europe) | 6.49M | 4.08% | $8.96M |
| Bellevue group | 6.24M | 3.92% | $408.51M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Tweedy, browne | 2.46M | 15.74% | $195.00M |
| Boone capital management | 417.83K | 8.96% | $27.33M |
| Bellevue group | 6.24M | 8.49% | $408.51M |
| Deep track capital, lp | 3.81M | 6.95% | $249.13M |
| Orion investment | 225.16K | 5.43% | $17.81M |
| Exome asset management | 131.02K | 5.19% | $8.57M |
| Privium fund management b.v. | 240.82K | 3.51% | $19.05M |
| Sicart associates | 163.56K | 3.43% | $12.94M |
| Sector gamma as | 184.98K | 3.34% | $14.63M |
| Vestal point capital, lp | 1.07M | 3.18% | $70.33M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Dld asset management, lp | 25.00M | 2.48% | 25.00M |
| Lombard odier asset management (europe) | 6.49M | 0.45% | 6.49M |
| Capital world investors | 17.96M | 0.19% | 5.24M |
| Deerfield management company, l.p. (series c) | 1.98M | 1.98% | 1.98M |
| Jpmorgan chase | 2.30M | 0.01% | 1.76M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| T. rowe price investment management | 13.16M | 0.53% | -2.89M |
| Orbimed advisors | - | - | -2.54M |
| Adage capital partners gp | 1.31M | 0.14% | -2.48M |
| Bvf inc/il | - | - | -1.91M |
| Bellevue group | 6.24M | 8.49% | -1.61M |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Dld asset management, lp | 25.00M | 2.48% | 25.00M | $34.63B |
| Lombard odier asset management (europe) | 6.49M | 0.45% | 6.49M | $8.96M |
| Deerfield management company, l.p. (series c) | 1.98M | 1.98% | 1.98M | $129.51M |
| Balyasny asset management | 768.65K | 0.05% | 768.65K | $30.37M |
| Summit partners public asset management | 750.00K | 1.02% | 750.00K | $49.06M |
Sold Out
| Holder | Change |
|---|---|
| Mv capital management | -3.00 |
| Wealthtrak capital management | -5.00 |
| Bryn mawr trust | -5.00 |
| Hexagon capital partners | -9.00 |
| Ronald blue trust | -10.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Dec 31, 2025 | 388 | -18.32% | 92,594,267 | -53.74% | 57 | 0.36% | 211 | -18.53% | 100 | -14.53% |
| Sep 30, 2025 | 449 | 17.23% | 194,303,017 | 14.72% | 122 | 1.08% | 241 | 17.56% | 115 | 6.48% |
| 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% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Fidelity Growth Compy Commingled Pl S | 11.01M | 6.67% | 28.88K |
| Fidelity Growth Compy Commingled Pl O | 9.71M | 6.16% | 90.97K |
| Fidelity Growth Company Fund | 8.11M | 4.91% | - |
| American Funds Growth Fund of Amer A | 6.40M | 3.95% | 4.00M |
| Capital Group Growth Fnd of Amer Comp | 6.40M | 3.95% | 4.00M |
| BB Biotech AG Ord | 6.22M | 3.84% | -1.63M |
| Vanguard Total Stock Mkt Idx Inv | 5.15M | 3.12% | 9.44K |
| Vanguard US Total Market Shares ETF | 4.50M | 2.83% | 256.36K |
| American Funds SMALLCAP World A | 4.22M | 2.61% | - |
| T. Rowe Price US Mid-Cap Growth Equity | 3.98M | 2.46% | -1.37M |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Apr 01, 2026 | KLEIN JOSEPH III | - | Sell | $168.31K |
| Apr 01, 2026 | KLEIN JOSEPH III | - | Sell | $1.52M |
| Apr 02, 2026 | Devers Shannon L. | EVP, Chief Human Resources Ofc | Sell | $458.61K |
| Mar 19, 2026 | Schneider Eugene | EVP, Chf Clinical Develop Ofcr | Sell | $412.49K |
| Mar 16, 2026 | HOUGEN ELIZABETH L | EVP, Finance & CFO | Sell | $14.88M |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | 3 |
| 2026 Q1 | - | 54 |
| 2025 Q4 | - | 33 |
| 2025 Q3 | - | 40 |
| 2025 Q2 | 1 | 3 |
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