Rallybio Corp (RLYB) Institutional Ownership

Ownership Summary

According to SEC filings for the period ending December 2025, Rallybio Corp (NASDAQ:RLYB) is held by 43 institutional firms.

• These investors collectively held 449.6% of the company's total shares outstanding in December 2025, down from 537.9% in September 2025.
• In percentage terms, this reflects as a holdings change of -5.78% quarter on quarter, and a decrease of 14.00% year over year.
• During the quarter, 11 institutions bought more Rallybio shares, 10 sold shares, and 22 of the 43 total investors held their position steady.
• Collectively, institutional investors decreased their stake in Rallybio to 24.88Mn shares as of December 2025, a change that is down by 1.53Mn shares quarter on quarter and down 7.54Mn shares year over year.
• With 4.19Mn shares, VIKING GLOBAL INVESTORS LP commands the largest institutional position in Rallybio as of December 31, 2025, equating to 75.78% of the company.
• Among the most significant buyers of Rallybio during December 2025 were RENAISSANCE TECHNOLOGIES LLC (120.89K), XTX Topco Ltd (97.31K), GSA CAPITAL PARTNERS LLP (19.30K), TWO SIGMA ADVISERS, LP (19.30K), VANGUARD GROUP INC (16.62K).
• Leading sellers of Rallybio stock in December 2025 included Almitas Capital LLC (1.55Mn), CITADEL ADVISORS LLC (184.86K), Rangeley Capital, LLC (43.01K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (35.57K), HRT FINANCIAL LP (10.84K).
• The top 10 institutional holders of Rallybio for the quarter ending December 2025 included VIKING GLOBAL INVESTORS LP (4.19Mn), JOHNSON & JOHNSON (3.64Mn), 5AM Venture Management, LLC (3.63Mn), TPG GP A, LLC (3.03Mn), Pivotal bioVenture Partners Investment Advisor LLC (2.40Mn), FMR LLC (1.69Mn), Almitas Capital LLC (1.53Mn), VANGUARD GROUP INC (1.02Mn), RENAISSANCE TECHNOLOGIES LLC (835.69K), AJU IB Investment Co., Ltd. (754.68K).