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Buy Day today: Neutral (48) Mixed market breadth · no major macro event
RLYB

Rallybio Corp

Healthcare · Biotechnology

17.10$ +2.6% vs. previous close Closing price · As of: Sep 28, 2026

Ownership

Ownership Structure

Who owns Rallybio Corp (RLYB)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 33.1% of the shares are freely tradable; institutional investors hold 98.8%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 98.8%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 4.2%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 33.1%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 1.2%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 5Mio.

Largest Shareholders

Institutions

Institutions RLYB
Name Stake (%) Shares Change (%) Date
FMR Inc 14.94 793,451 +274.6 03/31/2026
Viking Global Investors LP 9.87 524,347 +0.0 03/31/2026
Cormorant Asset Management, LLC 7.53 400,000 +0.0 03/31/2026
TPG GP A, LLC 7.13 378,551 +0.0 03/31/2026
Balyasny Asset Management LLC 7.09 376,573 +0.0 03/31/2026
LAURION CAPITAL MANAGEMENT LP 5.70 302,756 +0.0 03/31/2026
Nantahala Capital Management, LLC 5.66 300,635 +0.0 03/31/2026
Pivotal bioVenture Partners Investment Advisor LLC 5.66 300,579 +0.0 06/30/2026
Almitas Capital LLC 3.60 191,206 +0.0 03/31/2026

Funds

Funds RLYB
Name Stake (%) Shares Change (%) Date
Fidelity Growth Company Fund 3.93 207,412 +0.0 07/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Insider holdings

Insider holdings RLYB
Person Role Shares Value As of Type
Chung Wendy Director 3,562 60,910 $ Sep 16, 2026 direct

Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.

Insiders

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
Sep 16, 2026 Chung Wendy Director Other 3,562 2.38 8,478

Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →

Data as of: September 28, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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