---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-302246"
form_type: "8-K/A"
ticker: "ANNX"
cik: "0001528115"
company_name: "Annexon, Inc."
filed_at: "2023-12-22T23:59:59+00:00"
generated_at: "2026-06-07T07:51:59.198035+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Annexon raises ~$125M via public offering of 25M shares and 18.4M pre-funded warrants at $2.88

## Summary
- Offering includes 25,035,000 common shares at $2.88/share and 18,379,861 pre-funded warrants at $2.879 each.
- Gross proceeds expected to be ~$125M before underwriting discounts and expenses.
- Underwriters: Jefferies LLC and Cowen and Company, LLC; closing expected December 26, 2023.
- Pre-funded warrants exercisable immediately but subject to 9.99% beneficial ownership limitation (waivable to 19.99%).
- Offering conducted under shelf registration statement on Form S-3 (File No. 333-258863).

## SEC filing metadata
- accession: 0001193125-23-302246
- form_type: 8-K/A
- ticker: ANNX
- cik: 0001528115
- company_name: Annexon, Inc.
- filed_at: 2023-12-22T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 1.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1528115/000119312523302246/0001193125-23-302246-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1528115/000119312523302246/d719794d8ka.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-302246
- JSON: https://secwatch.observer/filing/0001193125-23-302246.json
- Plain text: https://secwatch.observer/filing/0001193125-23-302246.txt

## Key facts
- Material Agreements
  Annexon, Inc. entered into Underwriting Agreement with Jefferies LLC and Cowen and Company, LLC valued at $125,000,000 gross proceeds; 25,035,000 shares of common stock at $2.880 per share and pre-funded wa (effective 2023-12-20).
  - Action: entry
  - Agreement: underwriting
  - Counterparty: Jefferies LLC and Cowen and Company, LLC
  - Value: $125,000,000 gross proceeds; 25,035,000 shares of common stock at $2.880 per share and pre-funded wa
  - Effective: 2023-12-20
  source text: On December 20, 2023, Annexon, Inc. (the “ Company ’) entered into an underwriting agreement (“ Underwriting Agreement ”) with Jefferies LLC and Cowen and Company, LLC (the “ Underwriters ”), to issue and sell 25,035,000 shares (the “ Shares ”) of the Company’s common stock, par value $0.001 per share (the “ Common Stock ”) at a price of $2.880 per share and, in lieu of Common Stock, certain investors were issued pre-funded warrants to purchase an aggregate of 18,379,861 shares of Common Stock at a price of $2.879 (the “ Pre-Funded Warrants ”), which represents the per share price for the Shares less the $0.001 per share exercise price for each Pre-Funded Warrant (the “ Offering ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1528115/000119312523302246/0001193125-23-302246-index.htm
- Material Agreements
  Annexon, Inc. entered into Form of Pre-Funded Warrant with Certain investors valued at Pre-funded warrants to purchase up to 18,379,861 shares of common stock at $0.001 exercise price per (effective 2023-12-20).
  - Action: entry
  - Agreement: equity purchase
  - Counterparty: Certain investors
  - Value: Pre-funded warrants to purchase up to 18,379,861 shares of common stock at $0.001 exercise price per
  - Effective: 2023-12-20
  source text: in lieu of Common Stock, certain investors were issued pre-funded warrants to purchase an aggregate of 18,379,861 shares of Common Stock at a price of $2.879 (the “ Pre-Funded Warrants ”), which represents the per share price for the Shares less the $0.001 per share exercise price for each Pre-Funded Warrant
  evidence_url: https://www.sec.gov/Archives/edgar/data/1528115/000119312523302246/0001193125-23-302246-index.htm

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