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Ionis Pharmaceuticals Ownership | Who Owns Ionis Pharmaceuticals?

OverviewForecastRevenueFinancialsChartTranscripts

Ionis Pharmaceuticals Ownership Summary

Ionis Pharmaceuticals is owned by 109.88% institutional investors, 0.61% insiders. 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 6.76% of its assets in Ionis Pharmaceuticals shares.

IONS Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockIonis Pharmaceuticals109.88%0.61%-10.49%
SectorHealthcare Stocks 50.50%12.33%37.17%
IndustryBiotech Stocks 49.09%12.06%38.85%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Dld asset management, lp25.00M15.71%$34.63B
Fmr24.63M14.94%$1.95B
Capital world investors21.67M13.14%$1.72B
Vanguard group16.44M10.23%$1.30B
Blackrock10.32M7.09%$491.90M
Blackrock funding, inc. /de10.70M6.49%$848.77M
Wellington management group llp7.65M4.64%$606.68M
Vanguard capital management7.21M4.37%$571.80M
Lombard odier asset management (europe)6.49M4.08%$8.96M
Two sigma investments, lp6.25M3.79%$495.75M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Tweedy, browne2.28M13.70%$180.81M
Davern capital partners, lp798.71K10.80%$63.33M
Boone capital management519.98K9.64%$41.23M
Orion investment220.34K5.10%$17.47M
Privium fund management b.v.319.92K4.66%$25.37M
Exome asset management88.18K4.31%$6.99M
Sector gamma as189.47K3.26%$15.02M
Vestal point capital, lp1.07M3.18%$70.33M
Sicart associates160.69K3.12%$12.74M
Healthinvest partners ab137.13K2.93%$10.87M

Top Buyers

HolderShares% AssetsChange
Dld asset management, lp25.00M2.48%25.00M
Lombard odier asset management (europe)6.49M0.45%6.49M
Royal bank of canada6.18M0.07%2.38M
Sixth street partners management company1.61M0.02%1.61M
Barclays1.60M0.02%1.31M

Top Sellers

HolderShares% AssetsChange
Orbimed advisors---2.54M
T. rowe price investment management3.96M0.21%-2.20M
Bvf inc/il---1.91M
Macquarie group---1.13M
Bellevue group972.26K1.62%-846.41K

New Positions

HolderShares% AssetsChangeValue
Dld asset management, lp25.00M2.48%25.00M$34.63B
Lombard odier asset management (europe)6.49M0.45%6.49M$8.96M
Sixth street partners management company1.61M0.02%1.61M$127.26M
Capital investors823.76K0.01%823.76K$65.32M
Balyasny asset management768.65K0.05%768.65K$30.37M

Sold Out

HolderChange
Dunhill financial-2.00
Stone house investment management-3.00
Mv capital management-3.00
Wealthtrak capital management-5.00
Bare financial services-6.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Jun 30, 20265494.77%181,160,5464.97%1090.94%2758.27%151-1.95%
Mar 31, 2026320-39.16%77,385,968-54.54%480.43%144-47.83%98-32.41%
Dec 31, 2025388-18.32%92,594,267-53.74%570.36%211-18.53%100-14.53%
Sep 30, 202544917.23%194,303,01714.72%1221.08%24117.56%1156.48%
Jun 30, 20253793.55%169,594,6551.94%1060.97%20128.85%108-14.29%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
Fidelity Growth Compy Commingled Pl S11.23M6.76%78.82K
Fidelity Growth Compy Commingled Pl O9.71M6.16%90.97K
Fidelity Growth Company Fund8.47M5.10%-3.47K
American Funds Growth Fund of Amer A7.67M4.64%1.27M
American Funds Growth Fd of Amer A7.67M4.64%-
Capital Group Growth Fnd of Amer Comp7.67M4.61%-
BB Biotech AG Ord6.22M3.84%-1.63M
American Funds SMALLCAP World A5.26M3.18%801.77K
Vanguard Total Stock Mkt Idx Inv4.99M3.02%-9.79K
Vanguard Morn Total Stk Mkt Idx Investor4.99M3.00%-9.79K

Recent Insider Transactions

DateNameRoleActivityValue
Jul 31, 2026Hayden Michael R-Buy$258.00K
Jul 30, 2026Hayden Michael R-Buy$800.70K
Jul 07, 2026BENNETT C FRANK EVP, Chief Scientific OfficerSell$1.28M
Jul 07, 2026BENNETT C FRANK EVP, Chief Scientific OfficerSell$462.69K
Jul 07, 2026Diaz Allene M.-Sell$863.64K

Insider Transactions Trends

DateBuySell
2026 Q326
2026 Q2-26
2026 Q1-54
2025 Q4-33
2025 Q3-40

IONS Ownership FAQ

Who Owns Ionis Pharmaceuticals?

Ionis Pharmaceuticals shareholders are primarily institutional investors at 109.88%, followed by 0.61% insiders and -10.49% retail investors. The average institutional ownership in Ionis Pharmaceuticals's industry, Biotech Stocks , is 49.09%, which Ionis Pharmaceuticals exceeds.

Who owns the most shares of Ionis Pharmaceuticals?

Ionis Pharmaceuticals’s largest shareholders are Dld asset management, lp (25M shares, 15.71%), Fmr (24.63M shares, 14.94%), and Capital world investors (21.67M shares, 13.14%). Together, they hold 43.79% of Ionis Pharmaceuticals’s total shares outstanding.

Does Blackrock own Ionis Pharmaceuticals?

Yes, BlackRock owns 7.09% of Ionis Pharmaceuticals, totaling 10.32M shares as of Jun 2024. This represents 0.01% of BlackRock's total assets, with a market value of 491.9M$. In the last quarter, BlackRock increased its holdings by 549.14K shares, a 5.62% change.

Who is Ionis Pharmaceuticals’s biggest shareholder by percentage of total assets invested?

Tweedy, browne is Ionis Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 13.70% of its assets in 2.28M Ionis Pharmaceuticals shares, valued at 180.81M$.

Who is the top mutual fund holder of Ionis Pharmaceuticals shares?

Fidelity Growth Compy Commingled Pl S is the top mutual fund holder of Ionis Pharmaceuticals shares, with 6.76% of its total shares outstanding invested in 11.23M Ionis Pharmaceuticals shares.

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