Stock

Rallybio Corp

RLYB · held by 38 managers

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025

Reported value

$41.8M

Holders

+35 new · −1 exited

Holders’ est. mark

$24.9M

Price effect on 25 books still in the name

Largest holder

$7.12M

Fidelity

Notable conviction

Share of each notable manager’s 13F book.

Viking Global0.0% · $4.7M
Renaissance Technologies0.0% · $1.4M
Citadel0.0% · $178.4K
Fidelity0.0% · $7.12M

Holder count by quarter

Q4 2022 Q1 2023 Q2 2023 Q3 2023 Q4 2023 Q1 2024 Q2 2024 Q3 2024 Q4 2024 Q1 2025 Q2 2025 Q3 2025 Q4 2025 Q1 2026

Who holds it

Notable only

Investor	Shares	Value	Est. mark	Change
Fidelity	793.5K	$7.12M	$6.57M	Added$5.95M
Viking Global	524.3K	$4.7M	$4.34M	Added$1.83M
Cormorant Asset Management, LP	400K	$3.59M	—	New
TPG GP A, LLC	378.6K	$3.4M	$3.13M	Added$1.31M
Balyasny Asset Management L.P.	376.6K	$3.38M	—	New
Laurion Capital Management LP	302.8K	$2.72M	—	New
Nantahala Capital Management, LLC	300.6K	$2.7M	—	New
Pivotal bioVenture Partners Investment Advisor LLC	300.6K	$2.7M	$2.49M	Added$1.05M
5AM Venture Management, LLC	291.8K	$2.62M	$2.42M	Added$126.3K
Almitas Capital LLC	191.2K	$1.72M	$1.58M	Added$665.6K
Renaissance Technologies	156.5K	$1.4M	$1.3M	Added$830.7K
JOHNSON & JOHNSON	152.9K	$1.37M	$1.27M	Cut−$1.12M
VANGUARD CAPITAL MANAGEMENT LLC	112K	$1M	—	Held
AJU IB Investment Co., Ltd.	94.3K	$846.2K	$328.4K	Cut−$3.3M
Mariner, LLC	50.6K	$453.6K	$418.9K	Added$176K
GEODE CAPITAL MANAGEMENT, LLC	35.4K	$317.8K	$293.5K	Added$147.6K
DELTEC ASSET MANAGEMENT LLC	33.8K	$302.7K	—	New
Rangeley Capital, LLC	30.1K	$270.3K	$249.6K	Added$242.8K
GTS SECURITIES LLC	22K	$197.5K	—	New
ADAR1 Capital Management, LLC	20.5K	$184.2K	—	New
Citadel	19.9K	$178.4K	$164.7K	Added$4.22K
BlackRock, Inc.	17.5K	$156.8K	$144.9K	Added$59.7K
VANGUARD FIDUCIARY TRUST CO	13.5K	$121.5K	—	Held
DIMENSIONAL FUND ADVISORS LP	11.3K	$101.2K	—	New
XTX Topco Ltd	11.2K	$100.7K	$93K	Added$33.9K
UBS Group AG	7.91K	$71K	$37.9K	Added$67.8K
JPMORGAN CHASE & CO	2.5K	$20.1K	$603	Added$20K
Vanguard Global Advisers, LLC	1.44K	$12.9K	—	Held
Tower Research Capital LLC (TRC)	907	$8.14K	$7.51K	Added$5.03K
Hartford Financial Management Inc.	812	$7.28K	$6.73K	Added$2.82K
SBI Securities Co., Ltd.	524	$4.7K	$4.34K	Added$1.78K
MORGAN STANLEY	126	$1.13K	$1.04K	Cut−$2.05K
BNP PARIBAS FINANCIAL MARKETS	120	$1.08K	$994	Added$404
Fortitude Family Office, LLC	53	$475	—	New
WELLS FARGO & COMPANY/MN	37	$332	$307	Added$126
ACADIAN ASSET MANAGEMENT LLC	10.4K	$92	$85	Added$36
Allworth Financial LP	6	$54	$50	Added$19
DANSKE BANK A/S	1	$9	—	New

Who left

AJU IB Investment Co., Ltd.$4.14M
Viking Global$2.88M
JOHNSON & JOHNSON$2.49M
5AM Venture Management, LLC$2.49M
TPG GP A, LLC$2.09M
Pivotal bioVenture Partners Investment Advisor LLC$1.65M
Fidelity$1.16M
Almitas Capital LLC$1.05M
Renaissance Technologies$573.4K
Canaan Partners XI LLC$308.7K
Mariner, LLC$277.6K
Citadel$174.2K
GEODE CAPITAL MANAGEMENT, LLC$170.2K
BlackRock, Inc.$97.2K
SUSQUEHANNA INTERNATIONAL GROUP, LLP$69.1K

Positions as of Q1 2026. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.