Rallybio RLYB Insider Ownership

Updated Oct 9, 2026

Across the past 12 months, open-market trades by Rallybio insiders totaled $4.23 million in purchases and $3,992 in sales.

• Among RLYB insiders, Adar1 Capital Management, LLC (10% owner) bought the most stock on the open market in the past 12 months: $4.23 million, most recently on May 19, 2026.
• Meanwhile, the largest open-market sales of RLYB in the past 12 months were by Jonathan I. Lieber (Chief Financial Officer), totaling $3,992, most recently on February 23, 2026.
• Per Business Quant data, Rallybio insiders hold 1.07Mn shares in total based on their latest Form 4 filings, or 18.84% of the 5.7Mn shares outstanding; that total is up 4.71% from 1.03Mn shares (split-adjusted) at the end of Q3 2025.
• Direct holdings account for 147.51K shares (13.74%) of RLYB's insider total, and indirect holdings through trusts, partnerships and family members for 926.35K shares (86.26%).
• Business Quant counts 6 insiders with holdings in Rallybio stock, among the officers, directors and 10% owners who have filed a Form 4 in the past two years.
• Rallybio's top three insider holders by shares held are Adar1 Capital Management, LLC (10% owner, 926.35K shares), Stephen Uden (Chief Executive Officer, 115.62K shares) and Hui Liu (Director, 12.04K shares).
• The holding of Adar1 Capital Management, LLC makes up 86.26% of all shares held by Rallybio insiders.
• In the past year, 8 insiders of Rallybio submitted 12 Form 4 filings reporting trades, awards or other transactions.
• This summary of Rallybio insider activity covers Form 4 filings through October 8, 2026.