Siren LLC’s Annexon ANNX Stock Holding History

Siren LLC’s Portfolio ANNX Stock Details ANNX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$25.5M	Buy	4,458,646 +500,000	+13%	+$2.76M	0.52%	49
2026 Q1	$21.9M	Buy	+3,958,646	New	+$22.3M	0.61%	38

Other funds holding ANNX

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Redmile Group San Francisco, California $1.49B AUM 208.7% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

BVF Inc San Francisco, California $3.91B AUM 304.52% 1-Year Est. Return

Woodline Partners San Francisco, California $32.4B AUM 58.5% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

MCO

MAK Capital One New York $714M AUM 68.07% 1-Year Est. Return

Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

BCLSI

Bain Capital Life Sciences Investors Boston, Massachusetts $1.68B AUM 126.09% 1-Year Est. Return

Siren LLC's ANNX Position: Q2 2026 in Review

Siren LLC increased its Annexon (ANNX) stake by 13% in Q2 2026, buying an estimated $2.76M and bringing the position to 4,458,646 shares worth $25.5M. The position accounts for 0.52% of the portfolio, ranked #49.

Siren LLC first reported a position in ANNX in Q1 2026 and has held it in 2 quarters since. 217 funds tracked by Wall St. Rank hold ANNX as of Q2 2026.

Siren LLC held 4,458,646 shares of Annexon worth $25.5M as of Q2 2026.
Siren LLC bought 500,000 Annexon shares in Q2 2026, an estimated $2.76M.
Annexon made up 0.52% of Siren LLC's portfolio in Q2 2026, its #49 holding.
Siren LLC first reported a position in Annexon in Q1 2026 and has held it in 2 quarters since.
217 funds tracked by Wall St. Rank held Annexon as of Q2 2026.

Based on Siren LLC's 13F filing for Q2 2026, filed 13 Aug 2026.