---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-115958"
form_type: "8-K"
ticker: "CTMX"
cik: "0001501989"
company_name: "CytomX Therapeutics, Inc."
filed_at: "2026-03-19T23:59:59+00:00"
generated_at: "2026-05-15T09:37:09.957768+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# CytomX closes public offering of ~47M shares/warrants, net proceeds ~$234.4M for pipeline

## Summary
- Sold 45,990,567 shares at $5.30 and pre-funded warrants for 1,179,245 shares at $5.29999 each.
- Underwriters granted 30-day option to purchase up to 7,075,471 additional shares at the offering price.
- Net proceeds estimated at approximately $234.4 million after underwriting discounts and expenses.
- Proceeds to fund continued development of Varseta-M and other pipeline programs, plus general corporate purposes.
- Offering closed on March 19, 2026 under an underwriting agreement dated March 17, 2026.

## SEC filing metadata
- accession: 0001193125-26-115958
- form_type: 8-K
- ticker: CTMX
- cik: 0001501989
- company_name: CytomX Therapeutics, Inc.
- filed_at: 2026-03-19T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1501989/000119312526115958/0001193125-26-115958-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1501989/000119312526115958/d100765d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-115958
- JSON: https://secwatch.observer/filing/0001193125-26-115958.json
- Plain text: https://secwatch.observer/filing/0001193125-26-115958.txt

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