---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-249790"
form_type: "8-K"
ticker: "RLYB"
cik: "0001739410"
company_name: "Rallybio Corp"
filed_at: "2026-06-01T12:07:23+00:00"
generated_at: "2026-06-01T12:10:29.787076+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Rallybio to merge with Avenzo Therapeutics; pre-merger Avenzo holders to own ~56.6% of combined co

## Summary
- Avenzo stockholders expected to own ~56.6% of combined co; Rallybio stockholders ~2.8%; new investors in $215M concurrent financing ~40.6% on fully diluted basis.
- Rallybio will distribute net cash to stockholders pre-closing; holders receive CVRs for potential proceeds from legacy asset sales.
- Combined company led by Avenzo management: Dr. Athena Countouriotis as CEO, Scott Lipman as CFO; current Rallybio executives/directors expected to resign.
- Merger requires Rallybio stockholder approval, reverse stock split, name change to Avenzo Therapeutics; closing conditions include $215M financing and no material adverse effect.
- Support agreements from ~24.3% of Rallybio stockholders and ~78% of Avenzo stockholders; lock-up agreements for Avenzo insiders for 180 days post-closing.

## SEC filing metadata
- accession: 0001193125-26-249790
- form_type: 8-K
- ticker: RLYB
- cik: 0001739410
- company_name: Rallybio Corp
- filed_at: 2026-06-01T12:07:23+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 1.01, 3.02, 5.01, 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1739410/000119312526249790/0001193125-26-249790-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1739410/000119312526249790/d19106d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-249790
- JSON: https://secwatch.observer/filing/0001193125-26-249790.json
- Plain text: https://secwatch.observer/filing/0001193125-26-249790.txt

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