Rallybio RLYB Insider Ownership

Updated Nov 6, 2026

Across the past 12 months, open-market trades by Rallybio insiders totaled $4.23 million in purchases and $13,600 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 $13,600, most recently on October 27, 2026.
• Per Business Quant data, Rallybio insiders hold 1.32Mn shares in total based on their latest Form 4 filings.
• Direct holdings account for 398.36K shares (30.07%) of RLYB's insider total, and indirect holdings through trusts, partnerships and family members for 926.35K shares (69.93%).
• Business Quant counts 11 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, 148.86K shares) and Martin Mackay (Director, 125.03K shares).
• The holding of Adar1 Capital Management, LLC makes up 69.93% of all shares held by Rallybio insiders.
• Institutional investors held 70.09% of Rallybio stock at the end of Q2 2026, while the latest Form 4 filings of its insiders account for about 23.18%; other investors, including the public, hold roughly 6.73%.
• In the past year, 11 insiders of Rallybio submitted 25 Form 4 filings reporting trades, awards or other transactions.
• This summary of Rallybio insider activity covers Form 4 filings through November 5, 2026.