---
schema_version: "secwatch.filing_event.v1"
accession: "0001739410-26-000010"
form_type: "8-K"
ticker: "RLYB"
cik: "0001739410"
company_name: "Rallybio Corp"
filed_at: "2026-01-29T23:59:59+00:00"
generated_at: "2026-05-16T06:29:32.520455+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Rallybio announces 1-for-8 reverse stock split effective Feb 6, 2026

## Summary
- Reverse stock split at 1-for-8 ratio approved by shareholders; effective 12:01 a.m. ET on Feb 6, 2026.
- Shareholder vote: 34,507,021 for, 464,514 against, 11,939 abstain; no broker non-votes.
- Post-split CUSIP changes to 75120L 209; trading symbol RLYB on Nasdaq remains unchanged.
- Board selected 1-for-8 ratio from authorized range of 1-for-5 to 1-for-20 per shareholder approval.

## SEC filing metadata
- accession: 0001739410-26-000010
- form_type: 8-K
- ticker: RLYB
- cik: 0001739410
- company_name: Rallybio Corp
- filed_at: 2026-01-29T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.03, 5.07, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1739410/000173941026000010/0001739410-26-000010-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1739410/000173941026000010/rlyb-20260126.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001739410-26-000010
- JSON: https://secwatch.observer/filing/0001739410-26-000010.json
- Plain text: https://secwatch.observer/filing/0001739410-26-000010.txt

## Source-grounded claims
- claim_id: 20ed413b5f52e444de4e07934548e5271e33097c
  claim: Rallybio Corp: Effected a 1-for-8 reverse stock split of common stock via Certificate of Amendment to the Amended and Restated Certificate of Incorporation (effective 2026-02-06).
  evidence_excerpt: On January 26, 2026, Rallybio Corporation (the “Company”) filed a Certificate of Amendment (the “Certificate of Amendment”) to its Amended and Restated Certificate of Incorporation (the “Certificate of Incorporation”) with the Secretary of State of the State of Delaware to effect a reverse stock split of the Company’s issued and outstanding common stock, par value $0.0001 (the “Common Stock”) at a ratio of 1-for-8 (the “Reverse Stock Split”). Pursuant to the Certificate of Amendment, the Reverse Stock Split will be effective at 12:01 a.m., Eastern Time, on February 6, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1739410/000173941026000010/0001739410-26-000010-index.htm

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