Annexon Ownership | Who Owns Annexon?


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Annexon Ownership Summary


Annexon is owned by 67.25% institutional investors, 0.42% insiders, and 32.33% retail investors. Fmr is the largest institutional shareholder, holding 10.17% of ANNX shares. BB Biotech AG Ord is the top mutual fund, with 4.84% of its assets in Annexon shares.

ANNX Ownership Benchmark


TypeName% Inst% Insiders% Retail
StockAnnexon67.25%0.42%32.33%
SectorHealthcare Stocks 486.50%11.08%-397.59%
IndustryBiotech Stocks 304.14%11.08%-215.23%

Institutional Shareholders


Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Fmr14.22M10.17%$72.97M
Blackrock funding, inc. /de7.96M5.38%$19.11M
Blackrock6.59M5.37%$32.28M
Alerce investment management7.41M5.29%$37.99M
Bvf inc/il7.00M4.73%$16.80M
Redmile group6.30M4.25%$15.12M
Vanguard group5.55M3.96%$28.46M
Bain capital life sciences investors5.25M3.54%$12.60M
Bellevue group5.16M3.48%$12.38M
State street4.51M3.22%$23.14M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Alerce investment management7.41M66.89%$37.99M
Sio capital management4.10M3.75%$9.83M
Redmile group6.30M1.61%$15.12M
Bain capital life sciences investors5.25M1.58%$12.60M
Tfg asset management gp2.65M1.17%$5.11M
Sphera funds management1.76M0.99%$4.23M
Logos global management lp2.41M0.64%$5.78M
Bvf inc/il7.00M0.60%$16.80M
Sirios capital management l p989.58K0.34%$2.37M
Ghost tree capital214.50K0.33%$1.05M

Top Buyers

HolderShares% AssetsChange
Fmr14.22M0.00%5.66M
Blackrock6.59M0.00%1.54M
Tfg asset management gp2.65M1.17%1.25M
Ameriprise financial926.64K0.00%767.87K
Sio capital management4.10M3.75%697.98K

Top Sellers

HolderShares% AssetsChange
Adage capital partners gp---2.84M
Gmt capital---1.91M
Pictet asset management sa---1.64M
Logos global management lp2.41M0.64%-1.59M
Eventide asset management---1.02M

New Positions

HolderShares% AssetsChangeValue
Ghost tree capital214.50K0.33%214.50K$1.05M
Susquehanna portfolio strategies207.72K0.01%207.72K$498.52K
Lmr partners llp120.00K0.01%120.00K$588.00K
Natixis77.10K0.00%77.10K$185.04K
Ubs asset management americas49.06K0.00%49.06K$251.69K

Sold Out

HolderChange
National bank of canada /fi/-2.00
Nelson, van denburg & campbell wealth management group-9.00
True wealth design-17.00
Quadrant capital group-34.00
Lindbrook capital-83.00

Institutional Ownership Trends


DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Jun 30, 2025129-15.13%99,605,116-0.16%671.48%67-15.19%34-17.07%
Mar 31, 202510-93.59%26,197,503-76.64%170.28%4-95.51%--100.00%
Dec 31, 20241556.16%112,163,5481.74%801.29%8810.00%382.70%
Sep 30, 2024146-7.01%110,248,4342.42%781.02%80-18.37%3715.63%
Jun 30, 202415716.30%107,640,09113.59%871.47%9822.50%3214.29%

Top Mutual Funds Shareholders


HolderShares% HoldingChange
BB Biotech AG Ord5.16M4.84%-
Vanguard Total Stock Mkt Idx Inv3.11M2.83%99.45K
Vanguard US Total Market Shares ETF2.83M2.58%-
Candriam Eqs L Biotech C USD Cap2.53M2.31%-
Fidelity Growth Compy Commingled Pl O2.37M2.25%-
Fidelity Growth Compy Commingled Pl S2.45M2.24%-549.39K
SPDR® S&P Biotech ETF2.32M2.11%-14.13K
iShares Russell 2000 ETF2.26M2.06%-42.95K
Fidelity Growth Company Fund1.76M1.60%-408.00K
Columbia Small Cap Value I A1.36M1.24%37.30K

Recent Insider Transactions


DateNameRoleActivityValue
Jul 30, 2025Carson William H.-Buy$10.00K
Jul 14, 2025Yednock Ted EVP & CHIEF INNOVATION OFFICERSell$2.88K
Jul 14, 2025Lew Jennifer EVP & CHIEF FINANCIAL OFFICERSell$2.88K
Jul 14, 2025Overdorf Michael EVP & CHIEF BUSINESS OFFICERSell$2.23K
Jun 30, 2025Carson William H.-Buy$10.12K

Insider Transactions Trends


DateBuySell
2025 Q313
2025 Q21-
2025 Q1-9
2024 Q421
2024 Q337

ANNX Ownership FAQ


Who Owns Annexon?

Annexon shareholders are primarily institutional investors at 67.25%, followed by 0.42% insiders and 32.33% retail investors. The average institutional ownership in Annexon's industry, Biotech Stocks , is 304.14%, which Annexon falls below.

Who owns the most shares of Annexon?

Annexon’s largest shareholders are Fmr (14.22M shares, 10.17%), Blackrock funding, inc. /de (7.96M shares, 5.38%), and Blackrock (6.59M shares, 5.37%). Together, they hold 20.91% of Annexon’s total shares outstanding.

Does Blackrock own Annexon?

Yes, BlackRock owns 5.37% of Annexon, totaling 6.59M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 32.28M$. In the last quarter, BlackRock increased its holdings by 1.54M shares, a 30.61% change.

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

Alerce investment management is Annexon’s biggest shareholder by percentage of total assets invested, with 66.89% of its assets in 7.41M Annexon shares, valued at 37.99M$.

Who is the top mutual fund holder of Annexon shares?

BB Biotech AG Ord is the top mutual fund holder of Annexon shares, with 4.84% of its total shares outstanding invested in 5.16M Annexon shares.

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