0001528115 2026-08-12 2026-08-12 false 0001528115 8-K 2026-08-12 ANNEXON, INC. DE 001-39402 27-5414423 1400 Sierra Point Parkway Bldg C Suite 200 Brisbane CA 94005 (650) 822-5500 false false false false Common Stock, par value $0.001 per share ANNX NASDAQ false