---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-213583"
form_type: "8-K"
ticker: "XOMA"
cik: "0000791908"
company_name: "XOMA Royalty Corp"
filed_at: "2025-09-23T23:59:59+00:00"
generated_at: "2026-05-17T05:55:47.126438+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# XOMA completes acquisition of HilleVax for $1.95 per share plus CVR

## Summary
- XOMA acquired HilleVax via tender offer and merger; offer price of $1.95 cash plus one CVR per share.
- Approximately 77.48% of HilleVax shares were tendered (39,214,689 shares) and accepted.
- Merger closed September 17, 2025; HilleVax is now a wholly owned subsidiary of XOMA.
- CVR represents right to receive potential cash payments under CVR Agreement dated September 17, 2025.
- Financial statements of HilleVax will be filed in an amendment to this Form 8-K.

## SEC filing metadata
- accession: 0001193125-25-213583
- form_type: 8-K
- ticker: XOMA
- cik: 0000791908
- company_name: XOMA Royalty Corp
- filed_at: 2025-09-23T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/791908/000119312525213583/0001193125-25-213583-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/791908/000119312525213583/d48493d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-213583
- JSON: https://secwatch.observer/filing/0001193125-25-213583.json
- Plain text: https://secwatch.observer/filing/0001193125-25-213583.txt

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