Rallybio Corp (RLYB) Institutional Ownership

Ownership Summary

Rallybio Corp (NASDAQ:RLYB) has 45 institutional investors that have filed 13F reports for the period ending December 2025.

• These investors collectively held 55.3% of Rallybio's outstanding shares in December 2025, down from 66.1% in September 2025.
• Their total shares held in RLYB decreased -5.82% from the prior quarter, while the number of investors in Rallybio decreased 10.0% year over year.
• Of these 45 holders, 10 added to their stakes in Rallybio, 12 trimmed positions, and 23 made no changes.
• The aggregate institutional position in Rallybio amounted to 3.12Mn shares as of December 2025, down by 192.63K shares quarter on quarter, and down 942.96K shares year over year.
• As of December 31, 2025, Johnson & Johnson held the largest stake in Rallybio with 909.09K shares, accounting for 16.14% of total shares outstanding.
• Leading buyers of Rallybio shares for the quarter ending December 2025 were RENAISSANCE TECHNOLOGIES LLC (15.11K), XTX Topco Ltd (12.16K), GSA CAPITAL PARTNERS LLP (2.41K), TWO SIGMA ADVISERS, LP (2.41K), VANGUARD GROUP INC (2.08K).
• The largest sellers of Rallybio for the quarter ending December 2025 were Almitas Capital LLC (193.48K), CITADEL ADVISORS LLC (23.11K), Rangeley Capital, LLC (5.38K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (4.45K), Barclays Plc (2.64K).
• Business Quant data shows the 10 biggest positions in Rallybio as of December 2025 are held by Johnson & Johnson (909.09K), VIKING GLOBAL INVESTORS LP (524.35K), 5AM Venture Management, LLC (453.84K), TPG GP A, LLC (378.55K), Pivotal bioVenture Partners Investment Advisor LLC (300.58K), FMR LLC (211.8K), Almitas Capital LLC (191.21K), VANGUARD GROUP INC (127.03K), RENAISSANCE TECHNOLOGIES LLC (104.46K), AJU IB Investment Co., Ltd. (94.33K).