How many institutional investors hold RLYB?

2 tracked institutional investors disclosed a position in RLYB (RALLYBIO CORP) in their most recent 13F filing.

Who is the largest institutional holder of RLYB?

Andreas Halvorsen, Viking Global Investors, holds the largest disclosed position in RLYB, valued at $5M.

Where does this RLYB ownership data come from?

SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.

RLYB — RALLYBIO CORP

Name: RALLYBIO CORP (RLYB) — Institutional Ownership
Creator: InvestorLens
License: https://www.sec.gov/about/website-policies

Public company

For educational research only.InvestorLens analyzes public regulatory filings (SEC EDGAR, STOCK Act PTRs) that may be delayed by 45 days or more. Information shown is historical and is not financial, legal, or tax advice, nor a recommendation or solicitation to buy or sell any security. Always do your own research.

InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.

Sourced from SEC EDGAR public filings

About RALLYBIO CORP (RLYB)

RALLYBIO CORP (RLYB) appears in the most recent 13F filings of 2 tracked institutional investors. The largest disclosed position is held by Andreas Halvorsen (Viking Global Investors), valued at $5M. Across recent filings, tracked investors recorded 2 new positions, 0 increased, 0 reduced, and 0 exited. All data sourced from SEC 13F filings.

Smart Money Consensus™

Based on recent institutional activity in RLYB

100

/100

Strong Institutional Accumulation

Added / Increased2

Reduced0

Exited0

BearishBullish

Crowded Trade Score™

How many top investors track RLYB

/100

Undiscovered

2investors

Only 2 tracked investors report this position.

UndiscoveredCrowded

151015+

RLYB Ownership Composition

How RALLYBIO CORP is held across tracked investor types, based on reported 13F positions.

Dominant Type

Other

100% of tracked value

Institutions

tracked investors

Total Reported

$4.9M

combined 13F value

Other100.0%

Other(2)

100.0%

Tracked investors reporting RLYB

Investor	Firm	Shares	Market value	% of portfolio	As of
Andreas Halvorsen	Viking Global Investors	524.3K	$4.7M	0.01%	Mar 31, 2026
Ken Griffin	Citadel Advisors	19.9K	$178.4K	0.00%	Mar 31, 2026

Andreas HalvorsenMar 31, 2026
Viking Global Investors
Shares
524.3K
Value
$4.7M
% Portfolio
0.01%
Ken GriffinMar 31, 2026
Citadel Advisors
Shares
19.9K
Value
$178.4K
% Portfolio
0.00%

Recent activity

Investor	Action	Δ %	Current value	Filing date
Andreas Halvorsen	New	—	$2.9M	Feb 17, 2026
Andreas Halvorsen	New	—	$4.7M	May 15, 2026

Andreas Halvorsen
New
$2.9MFeb 17, 2026
Andreas Halvorsen
New
$4.7MMay 15, 2026

Frequently asked questions

How many institutional investors hold RLYB?: 2 tracked institutional investors disclosed a position in RLYB (RALLYBIO CORP) in their most recent 13F filing.
Who is the largest institutional holder of RLYB?: Andreas Halvorsen, Viking Global Investors, holds the largest disclosed position in RLYB, valued at $5M.
Did institutional ownership of RLYB increase or decrease?: Across recent 13F filings, tracked investors recorded 2 new positions, 0 increased, 0 reduced, and 0 fully exited RLYB.
Where does this RLYB ownership data come from?: SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.