Rallybio RLYB Institutional Ownership

Updated Nov 4, 2026

Rallybio Corp (NASDAQ:RLYB) had 37 institutional holders reporting a position on Form 13F for the quarter ended June 30, 2026.

• Together they owned 70.09% of the outstanding stock in Q2 2026, down from 82.03% a quarter earlier.
• Total holdings of Rallybio shares fell 14.40% from Q1 2026, and the number of holders fell 19.57% from Q2 2025.
• Of these 37 holders, 18 added to their positions, 7 reduced their stakes and 12 left their positions unchanged.
• Altogether, institutional holders owned 3.99Mn RLYB shares at the end of Q2 2026, down 672.16K from the prior quarter and up 107.82K from a year earlier.
• ADAR1 Capital Management, LLC led 13F holders of RLYB with 926.35K shares as of June 30, 2026, or 16.25% of shares outstanding.
• Holders that added the most shares of Rallybio in Q2 2026 were ADAR1 Capital Management, LLC (+905.82K shares), Rangeley Capital, LLC (+74.72K shares), Vanguard Capital Management LLC (+60.46K shares), Renaissance Technologies LLC (+43.38K shares) and BlackRock, Inc. (+12.85K shares).
• The biggest cuts to RLYB positions during Q2 2026 came from Nantahala Capital Management, LLC (-112.21K shares), Almitas Capital LLC (-70.52K shares), UBS Group AG (-7.77K shares), Geode Capital Management, LLC (-3.38K shares) and JPMorgan Chase & Co (-2.49K shares).
• Per Business Quant, the top 10 investors in RLYB for the quarter ended June 30, 2026 were ADAR1 Capital Management, LLC (926.35K shares), FMR LLC (794.72K shares), Viking Global Investors LP (524.35K shares), TPG GP A, LLC (378.55K shares), Pivotal bioVenture Partners Investment Advisor LLC (300.58K shares), Renaissance Technologies LLC (199.91K shares), Nantahala Capital Management, LLC (188.42K shares), Vanguard Capital Management LLC (172.5K shares), Almitas Capital LLC (120.68K shares) and Rangeley Capital, LLC (104.85K shares).