Rallybio Corp (RLYB) Institutional Ownership

Ownership Summary

According to SEC filings for the period ending December 2025, Rallybio Corp (NASDAQ:RLYB) is held by 29 institutional firms.

• Institutional ownership in Rallybio edged down to 237.9% in December 2025, compared to 535.4% in September 2025.
• The company experienced a 1.20% quarterly change in institutional shares held, alongside a decrease of 42.00% in total owners annually.
• The latest 13F cycle for Rallybio reveals that of 29 total investors, 7 funds grew their exposure, whereas 5 reduced theirs and 17 made no changes.
• The total number of shares held by institutions in Rallybio increased to 13.23Mn as of December 2025, a net change of up by 156.90K shares quarter on quarter, and down 19.20Mn shares year over year.
• The top institutional stake in Rallybio as of December 31, 2025 belongs to JOHNSON & JOHNSON, which owns 3.64Mn shares, or 65.39% of the company.
• Among the most significant buyers of Rallybio during December 2025 were RENAISSANCE TECHNOLOGIES LLC (120.89K), GSA CAPITAL PARTNERS LLP (19.30K), VANGUARD GROUP INC (16.62K), Ground Swell Capital, LLC (15.40K), ACT Advisors, LLC. (13.15K).
• Leading sellers of Rallybio stock in December 2025 included HRT FINANCIAL LP (10.84K), PRUDENTIAL FINANCIAL INC (9.30K), ACADIAN ASSET MANAGEMENT LLC (6.77K), CITIGROUP INC (5.96K), JPMORGAN CHASE & CO (800).
• The top 10 institutional holders of Rallybio for the quarter ending December 2025 included JOHNSON & JOHNSON (3.64Mn), TPG GP A, LLC (3.03Mn), Pivotal bioVenture Partners Investment Advisor LLC (2.40Mn), VANGUARD GROUP INC (1.02Mn), RENAISSANCE TECHNOLOGIES LLC (835.69K), AJU IB Investment Co., Ltd. (754.68K), Canaan Partners XI LLC (450.00K), Mariner, LLC (404.55K), GEODE CAPITAL MANAGEMENT, LLC (248.00K), BlackRock, Inc. (141.66K).