---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-118805"
form_type: "8-K"
ticker: "CTMX"
cik: "0001501989"
company_name: "CytomX Therapeutics, Inc."
filed_at: "2025-05-13T23:59:59+00:00"
generated_at: "2026-05-21T15:09:57.757385+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# CytomX nets $93.4M in underwritten common stock offering; 76.9M shares at $1.30

## Summary
- Sold 76,923,076 shares of common stock at $1.30/share, generating ~$93.4M in net proceeds after underwriting discounts and expenses.
- Proceeds to be used for research and development, general corporate purposes, and working capital.
- Underwriting syndicate led by Jefferies and Piper Sandler & Co.
- Offering closed on May 13, 2025; shares issued under effective shelf registration statement.

## SEC filing metadata
- accession: 0001193125-25-118805
- form_type: 8-K
- ticker: CTMX
- cik: 0001501989
- company_name: CytomX Therapeutics, Inc.
- filed_at: 2025-05-13T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- 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/1501989/000119312525118805/0001193125-25-118805-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1501989/000119312525118805/d53772d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-118805
- JSON: https://secwatch.observer/filing/0001193125-25-118805.json
- Plain text: https://secwatch.observer/filing/0001193125-25-118805.txt

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