Annexon Ownership | Who Owns Annexon?

Annexon Ownership Summary

Annexon is owned by 17.69% institutional investors, 0.57% insiders, and 81.75% 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

Type	Name	% Inst	% Insiders	% Retail
Stock	Annexon	17.69%	0.57%	81.75%
Sector	Healthcare Stocks	279.42%	10.64%	-190.05%
Industry	Biotech Stocks	64.05%	10.69%	25.27%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Fmr	14.22M	10.17%	$72.97M
Blackrock funding, inc. /de	8.49M	6.06%	$43.53M
Blackrock	6.59M	5.37%	$32.28M
Alerce investment management	7.41M	5.29%	$37.99M
Bvf inc/il	7.00M	4.73%	$13.51M
Redmile group	6.30M	4.25%	$12.16M
Point72 asset management	5.63M	4.02%	$28.87M
Vanguard group	5.55M	3.96%	$28.46M
Bellevue group	5.16M	3.69%	$26.46M
Bain capital life sciences investors	5.25M	3.54%	$10.13M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Alerce investment management	7.41M	66.89%	$37.99M
Sio capital management	3.40M	1.95%	$6.56M
Logos global management lp	2.55M	1.53%	$13.08M
Bain capital life sciences investors	5.25M	1.50%	$10.13M
Tfg asset management gp	2.65M	1.17%	$5.11M
Sphera funds management	1.24M	1.15%	$6.38M
Redmile group	6.30M	1.15%	$12.16M
Bvf inc/il	7.00M	0.55%	$13.51M
Bellevue group	5.16M	0.51%	$26.46M
Ghost tree capital	214.50K	0.33%	$1.05M

Top Buyers

Holder	Shares	% Assets	Change
Fmr	14.22M	0.00%	5.66M
Blackrock	6.59M	0.00%	1.54M
Tfg asset management gp	2.65M	1.17%	1.25M
Sphera funds management	1.24M	1.15%	1.24M
Sio capital management	3.40M	1.95%	1.03M

Top Sellers

Holder	Shares	% Assets	Change
Adage capital partners gp	-	-	-2.84M
Gmt capital	-	-	-1.91M
Pictet asset management sa	-	-	-1.64M
Eventide asset management	-	-	-1.02M
Polar capital	-	-	-1.00M

New Positions

Holder	Shares	% Assets	Change	Value
Sphera funds management	1.24M	1.15%	1.24M	$6.38M
Ghost tree capital	214.50K	0.33%	214.50K	$1.05M
J. safra sarasin	155.74K	0.01%	155.74K	$798.97K
Swiss national bank	135.00K	0.00%	135.00K	$692.55K
Lmr partners llp	120.00K	0.01%	120.00K	$588.00K

Sold Out

Holder	Change
National bank of canada /fi/	-2.00
Nelson, van denburg & campbell wealth management group	-9.00
Quadrant capital group	-34.00
Lindbrook capital	-83.00
Smartleaf asset management	-119.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2025	10	-93.59%	26,197,503	-76.64%	17	0.28%	4	-95.51%	-	-100.00%
Dec 31, 2024	155	6.16%	112,163,548	1.74%	80	1.29%	88	10.00%	38	2.70%
Sep 30, 2024	146	-7.01%	110,248,434	2.42%	78	1.02%	80	-18.37%	37	15.63%
Jun 30, 2024	157	16.30%	107,640,091	13.59%	87	1.47%	98	22.50%	32	14.29%
Mar 31, 2024	135	32.35%	94,758,161	17.52%	77	0.73%	80	42.86%	28	3.70%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
BB Biotech AG Ord	5.16M	4.84%	-
Vanguard Total Stock Mkt Idx Inv	3.01M	2.74%	-
Vanguard US Total Market Shares ETF	2.83M	2.58%	-
Candriam Eqs L Biotech C USD Cap	2.53M	2.31%	-
Fidelity Growth Compy Commingled Pl O	2.37M	2.25%	-
Fidelity Growth Compy Commingled Pl S	2.45M	2.24%	-549.39K
SPDR® S&P Biotech ETF	2.32M	2.11%	-14.13K
iShares Russell 2000 ETF	2.30M	2.10%	-37.22K
Fidelity Growth Company Fund	1.76M	1.60%	-408.00K
Vanguard Institutional Extnd Mkt Idx Tr	1.38M	1.26%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jul 30, 2025	Carson William H.	-	Buy	$10.00K
Jul 14, 2025	Yednock Ted	EVP & CHIEF INNOVATION OFFICER	Sell	$2.88K
Jul 14, 2025	Lew Jennifer	EVP & CHIEF FINANCIAL OFFICER	Sell	$2.88K
Jul 14, 2025	Overdorf Michael	EVP & CHIEF BUSINESS OFFICER	Sell	$2.23K
Jun 30, 2025	Carson William H.	-	Buy	$10.12K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	1	3
2025 Q2	1	-
2025 Q1	-	9
2024 Q4	2	1
2024 Q3	3	7

ANNX Ownership FAQ

Who Owns Annexon?

Annexon shareholders are primarily institutional investors at 17.69%, followed by 0.57% insiders and 81.74% retail investors. The average institutional ownership in Annexon's industry, Biotech Stocks , is 64.05%, 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 (8.49M shares, 6.06%), and Blackrock (6.59M shares, 5.37%). Together, they hold 21.60% 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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