---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-23-001474"
form_type: "8-K"
ticker: "RLYB"
cik: "0001739410"
company_name: "Rallybio Corp"
filed_at: "2023-01-31T23:59:59+00:00"
generated_at: "2026-06-20T05:33:47.498233+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Rallybio appoints Jonathan Lieber as CFO; co-founder Fryer departs Feb 15

## Summary
- Jonathan Lieber appointed CFO effective Feb 1, 2023; most recently CFO of AGTC.
- Base salary $460K, sign-on bonus $100K, target bonus up to 40% of base.
- Grant of option to purchase 240,000 shares, vesting over 4 years.
- Co-founder and former CFO Jeffrey Fryer departs Feb 15 after transition period.
- Lieber brings 30+ years experience as CFO and investment banker; also on board of Salarius Pharma.

## SEC filing metadata
- accession: 0000950170-23-001474
- form_type: 8-K
- ticker: RLYB
- cik: 0001739410
- company_name: Rallybio Corp
- filed_at: 2023-01-31T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1739410/000095017023001474/0000950170-23-001474-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1739410/000095017023001474/rlyb-20230131.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-23-001474
- JSON: https://secwatch.observer/filing/0000950170-23-001474.json
- Plain text: https://secwatch.observer/filing/0000950170-23-001474.txt

## Key facts
- Executive change
  Jonathan I. Lieber was appointed as Chief Financial Officer and Treasurer at Rallybio Corp.
  - Action: appointed
  - Role: Chief Financial Officer and Treasurer
  source text: On January 31, 2023, the Board of Directors (the Board) of Rallybio Corporation (Rallybio) appointed Jonathan I. Lieber as Chief Financial Officer and Treasurer, effective February 1, 2023.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1739410/000095017023001474/0000950170-23-001474-index.htm

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