Ionis Pharmaceuticals Ownership | Who Owns Ionis Pharmaceuticals?


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Ionis Pharmaceuticals Ownership Summary


Ionis Pharmaceuticals is owned by 122.10% 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 6.84% of its assets in Ionis Pharmaceuticals shares.

IONS Ownership Benchmark


TypeName% Inst% Insiders% Retail
StockIonis Pharmaceuticals122.10%0.61%-22.71%
SectorHealthcare Stocks 42.54%10.83%46.63%
IndustryBiotech Stocks 45.22%10.75%44.04%

Institutional Shareholders


Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Dld asset management, lp25.00M15.71%$34.63B
Fmr23.69M14.89%$1.55B
Vanguard group16.48M10.36%$1.08B
T. rowe price investment management13.16M8.27%$860.73M
Capital world investors12.72M7.99%$832.32M
Blackrock10.32M7.09%$491.90M
Blackrock funding, inc. /de10.45M6.57%$683.50M
Wellington management group llp6.59M4.14%$431.04M
Lombard odier asset management (europe)6.49M4.08%$8.96M
Bellevue group6.24M3.92%$408.51M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Tweedy, browne2.89M10.60%$114.26M
Boone capital management417.83K8.96%$27.33M
Bellevue group6.24M8.49%$408.51M
Deep track capital, lp3.81M6.95%$249.13M
Exome asset management131.02K5.19%$8.57M
Orion investment224.71K4.67%$14.70M
Sector gamma as270.96K4.40%$17.73M
Capricorn fund managers162.80K3.58%$10.65M
Vestal point capital, lp1.07M3.18%$70.33M
Privium fund management b.v.248.89K2.93%$16.28M

Top Buyers

HolderShares% AssetsChange
Dld asset management, lp25.00M2.48%25.00M
Lombard odier asset management (europe)6.49M0.45%6.49M
Deerfield management company, l.p. (series c)1.98M1.98%1.98M
Norges bank1.71M0.01%1.71M
Marshall wace, llp958.83K0.06%945.73K

Top Sellers

HolderShares% AssetsChange
T. rowe price investment management13.16M0.53%-2.89M
Orbimed advisors---2.54M
Adage capital partners gp1.31M0.14%-2.48M
Bvf inc/il---1.91M
Clearbridge investments---1.62M

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
Deerfield management company, l.p. (series c)1.98M1.98%1.98M$129.51M
Norges bank1.71M0.01%1.71M$59.95M
Balyasny asset management768.65K0.05%768.65K$30.37M

Sold Out

HolderChange
Activest wealth management-1.00
Mv capital management-3.00
Wealthtrak capital management-5.00
Hexagon capital partners-9.00
Voisard asset management group-10.00

Institutional Ownership Trends


DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
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%
Mar 31, 202515-96.08%14,001,670-91.30%80.08%6-96.65%6-94.92%
Dec 31, 2024235-38.48%100,254,792-35.75%670.61%111-39.34%73-31.78%
Sep 30, 20243780.27%156,005,8968.92%1041.08%1823.41%106-17.83%

Top Mutual Funds Shareholders


HolderShares% HoldingChange
Fidelity Growth Compy Commingled Pl S10.91M6.84%14.25K
Fidelity Growth Compy Commingled Pl O9.71M6.16%90.97K
BB Biotech AG Ord7.85M4.97%-
Fidelity Growth Company Fund7.70M4.83%-46.11K
T. Rowe Price US Mid-Cap Growth Equity5.99M3.77%300.20K
T. Rowe Price Mid-Cap Growth5.98M3.75%-11.00K
Vanguard Total Stock Mkt Idx Inv4.77M2.99%-99.81K
American Funds SMALLCAP World A4.57M2.87%108.08K
Vanguard US Total Market Shares ETF4.50M2.83%256.36K
Vanguard Health Care Inv3.99M2.50%-1.74M

Recent Insider Transactions


DateNameRoleActivityValue
Dec 01, 2025WENDER JOSEPH H-Sell$603.49K
Dec 01, 2025WENDER JOSEPH H-Sell$1.66M
Nov 25, 2025KLEIN JOSEPH III-Sell$320.00K
Nov 25, 2025Devers Shannon L. EVP, Chief Human Resources OfcSell$1.36M
Nov 19, 2025HERMAN JOAN E-Sell$2.31M

Insider Transactions Trends


DateBuySell
2025 Q4-33
2025 Q3-40
2025 Q213
2025 Q1-23
2024 Q424

IONS Ownership FAQ


Who Owns Ionis Pharmaceuticals?

Ionis Pharmaceuticals shareholders are primarily institutional investors at 122.10%, followed by 0.61% insiders and -22.71% retail investors. The average institutional ownership in Ionis Pharmaceuticals's industry, Biotech Stocks , is 45.22%, 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 (23.69M shares, 14.89%), and Vanguard group (16.48M shares, 10.36%). Together, they hold 40.95% 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 10.60% of its assets in 2.89M Ionis Pharmaceuticals shares, valued at 114.26M$.

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 6.84% of its total shares outstanding invested in 10.91M Ionis Pharmaceuticals shares.

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