Rallybio Corporation

RLYB • NASDAQ

Rallybio Corporation is a biotechnology company in the healthcare sector on NASDAQ, led by Stephen Uden, M.D., with a market cap of $30.9M. As of Q3 2025, 68% of shares are held by 45 institutional investors, with VIKING GLOBAL INVESTORS LP as the largest holder at 10.04%.

Chief Executive OfficerStephen Uden, M.D.

Market Cap$30.9M

Biotechnology

Healthcare

Employees30.0

Websiterallybio.com

Country

United States of America

Overview

Overview of institutional ownership in RLYB as of Q3 2025 with a market cap of $20.9M

All Institutions

Institutions: 45
Value Held: $14.1M
Shares Held: 28.3M
Avg Position: $313.8K
Median Position: $19.2K

Hedge Funds

Hedge Funds: 5
Value Held: $2.7M
Shares Held: 5.5M
Avg Position: $544.2K
Median Position: $218.9K

Ownership Breakdown

Institutional (non-HF)

54.68%

$11.4M

Hedge Funds

13.05%

$2.7M

Retail & Other

32.27%

$6.7M

Based on market cap of $20.9M as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in RLYB as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VIKING GLOBAL INVESTORS LP Hedge Fund•Long/Short	Ole Andreas Halvorsen CEO	$2.1M 0.01% of portfolio	10.04% 4.2M shares	Q3 2021 Held for 4y 2m	$38.5B
JOHNSON & JOHNSON Institution	Joaquin Duato CEO	$1.8M 0.36% of portfolio	8.70% 3.6M shares	Q2 2024 Held for 1y 5m	$503.7M
5 5AM Venture Management, LLC Institution	-	$1.8M 0.66% of portfolio	8.69% 3.6M shares	Q3 2021 Held for 4y 2m	$273.0M
New Leaf Venture Partners, L.L.C. Venture Capital	Vijay Kiran Lathi Managing Partner	$1.6M 3.83% of portfolio	7.90% 3.3M shares	Q3 2021 Held for 4y 2m	$43.0M
T TPG GP A, LLC Institution	-	$1.5M 0.08% of portfolio	7.25% 3.0M shares	Q4 2021 Held for 3y 11m	$1.8B
Pivotal bioVenture Partners Investment Advisor LLC RIA/Wealth	Tiffany Catherine Mcghee CEO	$1.2M 0.69% of portfolio	5.75% 2.4M shares	Q3 2021 Held for 4y 2m	$173.0M
FMR LLC Institution	-	$845.5K 0.00% of portfolio	4.05% 1.7M shares	Q3 2021 Held for 4y 2m	$1.92T
Almitas Capital LLC RIA/Wealth	Ronald Dean Mass Managing Partner	$767.8K 0.18% of portfolio	3.68% 1.5M shares	Q2 2024 Held for 1y 5m	$435.9M
VANGUARD GROUP INC Institution	Salim Ramji CEO	$498.8K 0.00% of portfolio	2.39% 999.6K shares	Q3 2021 Held for 4y 2m	$6.69T
AJU IB Investment Co., Ltd. Real Assets	Benjamin Jason Weprin CEO	$377.3K 0.33% of portfolio	1.81% 754.7K shares	Q4 2024 Held for 11 months	$115.1M

Net Capital Flow

Institutional buying and selling activity for RLYB in Q3 2025

Traded: −$937.1K
Buyers: 16
Sellers: 19
Total Bought: +$484.1K
Total Sold: −$1.4M
Avg Position: $261.5K

Biggest Buyers

Institution	Net Bought	Current Position
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	+$186.5K +373.8K shares	$218.9K 438.7K shares
RENAISSANCE TECHNOLOGIES LLC Hedge Fund•Quant	+$114.7K +229.8K shares	$356.7K 714.8K shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	+$56.4K +113.0K shares	$68.0K 136.3K shares
VANGUARD GROUP INC Institution	+$44.8K +89.7K shares	$498.8K 999.6K shares
R Rangeley Capital, LLC Hedge Fund•Event Driven	+$41.4K +83.0K shares	$41.4K 83.0K shares
PRUDENTIAL FINANCIAL INC Institution	+$19.2K +38.4K shares	$19.2K 38.4K shares
R Resources Investment Advisors, Inc. Pension/Endowment	+$10.0K +20.0K shares	$10.0K 20.0K shares
CITIGROUP INC Institution	+$4.9K +9.9K shares	$4.9K 9.9K shares
X XTX Topco Ltd Institution	+$1.8K +3.6K shares	$29.5K 59.1K shares
T Tower Research Capital LLC Institution	+$1.4K +2.8K shares	$5.1K 10.2K shares

Biggest Sellers

Institution	Net Sold	Current Position
S Standard Life Aberdeen plc Institution	−$539.2K −1.6M shares	Sold Off 0 shares
Laurion Capital Management LP Hedge Fund•Multi-Strategy	−$248.6K −735.5K shares	Sold Off 0 shares
C Canaan Partners XI LLC Institution	−$245.0K −491.0K shares	$224.6K 450.0K shares
Almitas Capital LLC RIA/Wealth	−$139.1K −278.8K shares	$767.8K 1.5M shares
FMR LLC Institution	−$87.8K −175.9K shares	$845.5K 1.7M shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$60.8K −179.8K shares	Sold Off 0 shares
TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy	−$30.0K −88.9K shares	Sold Off 0 shares
TWO SIGMA INVESTMENTS LLC Hedge Fund•Multi-Strategy	−$21.1K −42.3K shares	$10.7K 21.5K shares
MORGAN STANLEY RIA/Wealth	−$15.9K −31.8K shares	$2.3K 4.6K shares
V Virtu Financial LLC Institution	−$8.7K −17.5K shares	$19.6K 39.3K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited RLYB in Q3 2025

New Positions: 5
New Value: $70.9K
Exited Positions: 9
Exited Value: $892.3K

New Positions

Institution	Position Value
R Rangeley Capital, LLC Hedge Fund•Event Driven	$41.4K 83.0K shares
PRUDENTIAL FINANCIAL INC Institution	$19.2K 38.4K shares
R Resources Investment Advisors, Inc. Pension/Endowment	$10.0K 20.0K shares
Rockefeller Capital Management L.P. Long Only Manager	$274.0 550.0 shares
J JONES FINANCIAL COMPANIES LLLP Institution	$50.0 90.0 shares

Exited Positions

Institution	Previous Position
S Standard Life Aberdeen plc Institution	$539.2K 1.6M shares
Laurion Capital Management LP Hedge Fund•Multi-Strategy	$248.6K 735.5K shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	$60.8K 179.8K shares
TWO SIGMA ADVISERS, LLC Hedge Fund•Multi-Strategy	$30.0K 88.9K shares
T TWO SIGMA SECURITIES, LLC Institution	$5.1K 15.2K shares
J JANE STREET GROUP, LLC Institution	$4.0K 11.7K shares
H HSBC HOLDINGS PLC Institution	$3.5K 10.5K shares
FEDERATED INVESTORS INC /PA/ Long Only Manager	$747.0 2.2K shares
RAYMOND JAMES FINANCIAL INC RIA/Wealth	$288.0 850.0 shares

Options Activity

Institutions with the largest Call and Put options positions in RLYB as of Q3 2025

Call Positions: 0
Call Value: -
Put Positions: 0
Put Value: -

Call Positions

Institution	Position Value
No call positions found

Put Positions

Institution	Position Value
No put positions found

Most Committed Institutions

Institutions with RLYB as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
New Leaf Venture Partners, L.L.C. Venture Capital	Vijay Kiran Lathi Managing Partner	3.83% $1.6M	7.90% 3.3M shares	Q3 2021 Held for 4y 2m	$43.0M
Pivotal bioVenture Partners Investment Advisor LLC RIA/Wealth	Tiffany Catherine Mcghee CEO	0.69% $1.2M	5.75% 2.4M shares	Q3 2021 Held for 4y 2m	$173.0M
5 5AM Venture Management, LLC Institution	-	0.66% $1.8M	8.69% 3.6M shares	Q3 2021 Held for 4y 2m	$273.0M
JOHNSON & JOHNSON Institution	Joaquin Duato CEO	0.36% $1.8M	8.70% 3.6M shares	Q2 2024 Held for 1y 5m	$503.7M
AJU IB Investment Co., Ltd. Real Assets	Benjamin Jason Weprin CEO	0.33% $377.3K	1.81% 754.7K shares	Q4 2024 Held for 11 months	$115.1M
C Canaan Partners XI LLC Institution	-	0.22% $224.6K	1.08% 450.0K shares	Q4 2021 Held for 3y 11m	$102.9M
Almitas Capital LLC RIA/Wealth	Ronald Dean Mass Managing Partner	0.18% $767.8K	3.68% 1.5M shares	Q2 2024 Held for 1y 5m	$435.9M
T TPG GP A, LLC Institution	-	0.08% $1.5M	7.25% 3.0M shares	Q4 2021 Held for 3y 11m	$1.8B
R Rangeley Capital, LLC Hedge Fund•Event Driven	Christopher Clay Demuth Jr. Managing Partner	0.04% $41.4K	0.20% 83.0K shares	Q3 2025 Held for 2 months	$105.5M
VIKING GLOBAL INVESTORS LP Hedge Fund•Long/Short	Ole Andreas Halvorsen CEO	0.01% $2.1M	10.04% 4.2M shares	Q3 2021 Held for 4y 2m	$38.5B

Hedge Fund Spotlight

Discover hedge funds investing in RLYB

RENAISSANCE TECHNOLOGIES LLC

Hedge Fund • Quant

Portfolio ManagerPeter Fitzhugh Brown

Portfolio Value: $75.8B
Positions: 3,419
Last Reported: Q3 2025

Sector Allocation

Position in Rallybio Corporation

Market Value: $356.7K
Shares Held: 714.8K
Portfolio Weight: 0.00%
Owned Since: 2024-Q1

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