---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-24-036399"
form_type: "8-K"
ticker: "ANNX"
cik: "0001528115"
company_name: "Annexon, Inc."
filed_at: "2024-03-26T23:59:59+00:00"
generated_at: "2026-06-04T07:50:24.953888+00:00"
event_type: "earnings"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Annexon reports Q4 2023 net loss $27.9M; cash $259.7M; Phase 3 GBS data Q2 2024

## Summary
- Net loss for FY2023 $134.2M vs $141.9M in prior year; R&D spend $113.8M.
- Cash and short-term investments $259.7M as of Dec 31, 2023; runway into mid-2026.
- Phase 3 ANX005 GBS topline data expected Q2 2024; BLA submission supported by RWE from IGOS.
- Phase 3 ANX007 GA ARCHER II trial (sham-controlled) to initiate mid-2024; ARROW head-to-head vs SYFOVRE planned H2 2024.
- Completed $125M financing in December 2023 extending operating runway.

## SEC filing metadata
- accession: 0000950170-24-036399
- form_type: 8-K
- ticker: ANNX
- cik: 0001528115
- company_name: Annexon, Inc.
- filed_at: 2024-03-26T23:59:59+00:00
- event_type: earnings
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1528115/000095017024036399/0000950170-24-036399-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1528115/000095017024036399/annx-20240326.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-24-036399
- JSON: https://secwatch.observer/filing/0000950170-24-036399.json
- Plain text: https://secwatch.observer/filing/0000950170-24-036399.txt

## Key facts
- Earnings Releases
  Annexon, Inc. reported financial results for fourth quarter and the year ended December 31, 2023.
  - Period: fourth quarter and the year ended December 31, 2023
  - Result: reported results
  source text: On March 26, 2024, Annexon, Inc. (the “Company”) announced certain financial results for the fourth quarter and the year ended December 31, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1528115/000095017024036399/0000950170-24-036399-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.