Lieber Jonathan I 4

What Happened
Jonathan I. Lieber, Chief Financial Officer of Rallybio (RLYB), reported a partial vesting of a performance stock award and a subsequent sale to cover taxes. On 2026-02-18 he was issued 2,500 shares as an award (acquired at $0.00). On 2026-02-23 he disposed of 789 shares in an open-market sale at $5.06 per share, generating proceeds of $3,992. The filing’s footnote states the sale was solely to satisfy tax withholding obligations upon vesting.

Key Details

• Award/Acquisition: 2,500 shares (code A) on 2026-02-18 at $0.00
• Sale/Disposition: 789 shares (code S) on 2026-02-23 at $5.06 — proceeds $3,992
• Footnote: Sale made solely to satisfy tax withholding on vested performance shares (F1)
• Shares owned after transaction: Not specified in the filing
• Filing date / Timeliness: Form 4 filed 2026-02-23 (same day as the reported sale), which appears timely under Form 4 reporting rules

Context
This sequence — shares vesting and a portion sold to cover withholding taxes — is a common, administrative insider transaction and does not by itself signal a change in the insider’s view of the company. Retail investors typically view outright purchases as stronger signals; routine withholding sales are primarily tax-driven.