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 168 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	$51.32M 10,222,470 shares	0.00%	-858.69K(-7.70%)Reduced	SEC filing ↗ Feb 17, 2026	▾
02	Redmile Group, LLC CIK 1425738 · View history	$50.45M 10,050,644 shares	3.72%	+3.75M(+59.50%)Added	SEC filing ↗ Feb 17, 2026	▾
03	BVF INC/IL CIK 1056807 · View history	$45.82M 9,128,080 shares	1.54%	+2.13M(+30.40%)Added	SEC filing ↗ Feb 17, 2026	▾
04	BlackRock, Inc. CIK 2012383 · View history	$44.98M 8,960,434 shares	0.00%	+1.06M(+13.40%)Added	SEC filing ↗ Feb 12, 2026	▾
05	VANGUARD GROUP INC CIK 102909 · View history	$38.92M 7,753,387 shares	0.00%	+1.92M(+32.90%)Added	SEC filing ↗ Jan 29, 2026	▾
06	ADAGE CAPITAL PARTNERS GP, L.L.C. CIK 1165408 · View history	$27.61M 5,500,000 shares	0.04%	+4.00M(+266.70%)Added	SEC filing ↗ Feb 17, 2026	▾
07	Bain Capital Life Sciences Investors, LLC CIK 1703031 · View history	$26.35M 5,249,069 shares	2.02%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
08	Bellevue Group AG CIK 1674546 · View history	$25.89M 5,157,290 shares	0.49%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
09	STATE STREET CORP CIK 93751 · View history	$23.35M 4,652,185 shares	0.00%	+2.60M(+126.90%)Added	SEC filing ↗ Feb 13, 2026	▾
10	AMERIPRISE FINANCIAL INC CIK 820027 · View history	$21.83M 4,348,782 shares	0.00%	+2.16M(+98.40%)Added	SEC filing ↗ Feb 17, 2026	▾
11	Woodline Partners LP CIK 1784547 · View history	$20.08M 4,000,074 shares	0.08%	+1.36M(+51.60%)Added	SEC filing ↗ Feb 17, 2026	▾
12	Balyasny Asset Management L.P. CIK 1218710 · View history	$16.56M 3,299,256 shares	0.03%	+2.00M(+154.30%)Added	SEC filing ↗ Feb 17, 2026	▾
13	Longaeva Partners L.P. CIK 2054122 · View history	$15.56M 3,100,000 shares	1.85%	+3.10MNew	SEC filing ↗ Feb 17, 2026	▾
14	MAK CAPITAL ONE LLC CIK 1385702 · View history	$14.85M 2,958,527 shares	2.00%	+2.96MNew	SEC filing ↗ Feb 17, 2026	▾
15	Nuveen, LLC CIK 1871926 · View history	$14.63M 2,915,324 shares	0.00%	+2.23M(+327.10%)Added	SEC filing ↗ Feb 12, 2026	▾
16	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$14.58M 2,902,896 shares	0.00%	+465.95K(+19.10%)Added	SEC filing ↗ Feb 9, 2026	▾
17	MORGAN STANLEY CIK 895421 · Amended · View history	$14.34M 2,856,143 shares	0.00%	-173.71K(-5.70%)Reduced	SEC filing ↗ May 27, 2026	▾
18	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$14.24M 2,836,857 shares	0.01%	+14.03K(+0.50%)Added	SEC filing ↗ Feb 17, 2026	▾
19	Opaleye Management Inc. CIK 1595855 · Amended · View history	$13.05M 2,600,000 shares	1.72%	0(0.00%)Unchanged	SEC filing ↗ Apr 13, 2026	▾
20	Palo Alto Investors LP CIK 1306923 · View history	$11.97M 2,384,192 shares	1.67%	+2.38MNew	SEC filing ↗ Feb 17, 2026	▾

Showing 20 / 168 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

168

Cancelled or null records excluded

Disclosed shares

136,904,584

Not deduplicated across managers

Disclosed value

$687.20M

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. · Q4 2025

Explore all 168 reporting institutions.

This page includes 20 of 168 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.