Ionis Pharmaceuticals Ownership | Who Owns Ionis Pharmaceuticals?
Ionis Pharmaceuticals Ownership Summary
Ionis Pharmaceuticals is owned by 48.37% institutional investors, 0.61% insiders, and 51.02% 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 6.66% of its assets in Ionis Pharmaceuticals shares.
IONS Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Ionis Pharmaceuticals | 48.37% | 0.61% | 51.02% |
| Sector | Healthcare Stocks | 35.49% | 11.78% | 52.72% |
| Industry | Biotech Stocks | 34.84% | 11.71% | 53.45% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Dld asset management, lp | 25.00M | 15.71% | $34.63B |
| Fmr | 24.56M | 15.35% | $1.84B |
| Capital world investors | 21.19M | 13.24% | $1.59B |
| Vanguard group | 16.44M | 10.23% | $1.30B |
| Blackrock | 10.32M | 7.09% | $491.90M |
| Blackrock funding, inc. /de | 10.44M | 6.53% | $784.13M |
| Lombard odier asset management (europe) | 6.49M | 4.08% | $8.96M |
| Wellington management group llp | 6.39M | 3.99% | $479.96M |
| T. rowe price investment management | 6.16M | 3.85% | $462.48M |
| Two sigma investments, lp | 5.86M | 3.66% | $439.85M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Tweedy, browne | 2.28M | 13.57% | $170.88M |
| Boone capital management | 500.52K | 11.51% | $37.58M |
| Davern capital partners, lp | 386.90K | 7.97% | $29.05M |
| Orion investment | 225.01K | 5.36% | $16.90M |
| Privium fund management b.v. | 290.02K | 4.53% | $21.78M |
| Exome asset management | 110.06K | 4.27% | $8.26M |
| Bellevue group | 1.82M | 3.25% | $136.56M |
| Vestal point capital, lp | 1.07M | 3.18% | $70.33M |
| Sicart associates | 159.41K | 3.08% | $11.97M |
| Healthinvest partners ab | 27.87K | 3.03% | $9.40M |
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 | 21.19M | 0.22% | 3.23M |
| Two sigma investments, lp | 5.86M | 0.35% | 3.20M |
| Royal bank of canada | 3.80M | 0.05% | 2.68M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Bellevue group | 1.82M | 3.25% | -2.98M |
| T. rowe price investment management | 6.16M | 0.32% | -2.95M |
| Orbimed advisors | - | - | -2.54M |
| Bvf inc/il | - | - | -1.91M |
| Citadel advisors | 942.53K | 0.01% | -1.19M |
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 |
| Vanguard fiduciary trust | 1.02M | 0.02% | 1.02M | $76.92M |
| Balyasny asset management | 768.65K | 0.05% | 768.65K | $30.37M |
| Perceptive advisors | 504.00K | 0.74% | 504.00K | $37.85M |
Sold Out
| Holder | Change |
|---|---|
| Stone house investment management | -3.00 |
| Mv capital management | -3.00 |
| Wealthtrak capital management | -5.00 |
| Bryn mawr trust | -5.00 |
| Bare financial services | -6.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 31, 2026 | 320 | -39.16% | 77,385,968 | -54.54% | 48 | 0.43% | 144 | -47.83% | 98 | -32.41% |
| 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% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Fidelity Growth Compy Commingled Pl S | 11.01M | 6.66% | -84.03K |
| Fidelity Growth Compy Commingled Pl O | 9.71M | 6.16% | 90.97K |
| Fidelity Growth Company Fund | 8.41M | 5.09% | 301.10K |
| American Funds Growth Fund of Amer A | 7.67M | 4.64% | 1.27M |
| Capital Group Growth Fnd of Amer Comp | 7.67M | 4.62% | 1.27M |
| BB Biotech AG Ord | 6.22M | 3.84% | -1.63M |
| Vanguard Total Stock Mkt Idx Inv | 5.00M | 3.02% | -153.46K |
| American Funds New Economy A | 4.72M | 2.86% | 845.41K |
| Capital Group New Economy Comp | 4.72M | 2.85% | 845.41K |
| Vanguard US Total Market Shares ETF | 4.50M | 2.83% | 256.36K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| May 14, 2026 | Monia Brett P | Chief Executive Officer | Sell | $253.35K |
| May 13, 2026 | Monia Brett P | Chief Executive Officer | Sell | $102.67K |
| May 04, 2026 | LOSCALZO JOSEPH | - | Sell | $1.34M |
| May 04, 2026 | LOSCALZO JOSEPH | - | Sell | $4.46M |
| May 01, 2026 | KLEIN JOSEPH III | - | Sell | $106.53K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q2 | - | 15 |
| 2026 Q1 | - | 54 |
| 2025 Q4 | - | 33 |
| 2025 Q3 | - | 40 |
| 2025 Q2 | 1 | 3 |
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