Company · Ownership research

Annexon, Inc. ANNX

CIK 0001528115 · CUSIP 03589W102

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 03589W102 (ANNX), not CUSIP 03589W902 (ANNX), CUSIP 03589W952 (ANNX), and does not merge CUSIPs.

This page lists the top 20 of 144 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	FMR LLC CIK 315066 · View history	$33.80M 11,081,163 shares	0.00%	-4.61M(-29.40%)Reduced	SEC filing ↗ Nov 13, 2025	▾
02	BlackRock, Inc. CIK 2012383 · View history	$24.09M 7,899,008 shares	0.00%	-63.36K(-0.80%)Reduced	SEC filing ↗ Nov 12, 2025	▾
03	BVF INC/IL CIK 1056807 · View history	$21.35M 7,000,000 shares	0.87%	0(0.00%)Unchanged	SEC filing ↗ Nov 14, 2025	▾
04	Redmile Group, LLC CIK 1425738 · View history	$19.22M 6,300,644 shares	1.87%	0(0.00%)Unchanged	SEC filing ↗ Nov 14, 2025	▾
05	VANGUARD GROUP INC CIK 102909 · View history	$17.80M 5,835,112 shares	0.00%	+469.07K(+8.70%)Added	SEC filing ↗ Nov 7, 2025	▾
06	Bain Capital Life Sciences Investors, LLC CIK 1703031 · View history	$16.01M 5,249,069 shares	1.06%	0(0.00%)Unchanged	SEC filing ↗ Nov 14, 2025	▾
07	Bellevue Group AG CIK 1674546 · View history	$15.73M 5,157,290 shares	0.33%	0(0.00%)Unchanged	SEC filing ↗ Nov 14, 2025	▾
08	MORGAN STANLEY CIK 895421 · Amended · View history	$9.24M 3,029,848 shares	0.00%	+2.20M(+263.90%)Added	SEC filing ↗ May 27, 2026	▾
09	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$8.61M 2,822,823 shares	0.01%	+308.69K(+12.30%)Added	SEC filing ↗ Nov 14, 2025	▾
10	Woodline Partners LP CIK 1784547 · View history	$8.05M 2,638,275 shares	0.04%	+1.58M(+150.40%)Added	SEC filing ↗ Nov 14, 2025	▾
11	Opaleye Management Inc. CIK 1595855 · View history	$7.93M 2,600,000 shares	1.12%	+2.60MNew	SEC filing ↗ Nov 14, 2025	▾
12	Candriam S.C.A. CIK 1537014 · View history	$7.73M 2,534,230 shares	0.04%	0(0.00%)Unchanged	SEC filing ↗ Nov 6, 2025	▾
13	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$7.43M 2,436,944 shares	0.00%	+152.17K(+6.70%)Added	SEC filing ↗ Nov 12, 2025	▾
14	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$7.34M 2,406,432 shares	0.00%	+775.78K(+47.60%)Added	SEC filing ↗ Nov 14, 2025	▾
15	AMERIPRISE FINANCIAL INC CIK 820027 · View history	$6.69M 2,192,354 shares	0.00%	+26.18K(+1.20%)Added	SEC filing ↗ Nov 14, 2025	▾
16	Tetragon Partners GP Ltd CIK 1515070 · View history	$6.44M 2,112,455 shares	0.94%	-697.54K(-24.80%)Reduced	SEC filing ↗ Nov 14, 2025	▾
17	STATE STREET CORP CIK 93751 · View history	$6.25M 2,050,308 shares	0.00%	+69.32K(+3.50%)Added	SEC filing ↗ Nov 14, 2025	▾
18	SPHERA FUNDS MANAGEMENT LTD. CIK 1496201 · View history	$5.47M 1,794,387 shares	1.30%	+30.00K(+1.70%)Added	SEC filing ↗ Nov 14, 2025	▾
19	DEUTSCHE BANK AG\ CIK 948046 · View history	$4.59M 1,504,349 shares	0.00%	+992.90K(+194.10%)Added	SEC filing ↗ Nov 13, 2025	▾
20	ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 1165408 · View history	$4.58M 1,500,000 shares	0.01%	+1.50MNew	SEC filing ↗ Nov 14, 2025	▾

Showing 20 / 144 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

144

Cancelled or null records excluded

Disclosed shares

101,381,026

Not deduplicated across managers

Disclosed value

$309.22M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Annexon, Inc. · Q3 2025

Explore all 144 reporting institutions.

This page includes 20 of 144 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.