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RLYB · NASDAQ · Biotechnology

Rallybio (RLYB)

Develops rare-disease therapies while pursuing a merger with oncology developer Avenzo.

$17.12

At close+0.43 (+2.58%)

Watchlist

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Breakdown13F · 13D/G · Form 4

Institutions38 holders · as of Mar 31, 2026	87.87%	4.67M shares
Insiders2 holders · as of Jul 10, 2026	0.20%	10.7K shares
Otherremainder	11.93%	633.4K shares

5.31M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing

A stock split fell inside the quarter, so quarter-on-quarter changes are not shown.

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
FMR LLCInstitution	14.94%	793,451	13Fas of Mar 31, 2026
Viking Global Investors LPInstitution	9.87%	524,347	13Fas of Mar 31, 2026
Cormorant Asset Management, LPInstitution	7.53%	400,000	13Fas of Mar 31, 2026
TPG GP A, LLCInstitution	7.13%	378,551	13Fas of Mar 31, 2026
Balyasny Asset Management L.P.Institution	7.09%	376,573	13Fas of Mar 31, 2026
Laurion Capital Management LPInstitution	5.70%	302,756	13Fas of Mar 31, 2026
Nantahala Capital Management, LLCInstitution	5.66%	300,635	13Fas of Mar 31, 2026
Pivotal Bioventure Partners Investment Advisor LLCInstitution	5.66%	300,579	13Fas of Mar 31, 2026
5Am Venture Management, LLCInstitution	5.49%	291,788	13Fas of Mar 31, 2026
Almitas Capital LLCInstitution	3.60%	191,206	13Fas of Mar 31, 2026
Renaissance Technologies LLCInstitution	2.95%	156,527	13Fas of Mar 31, 2026
Johnson & JohnsonInstitution	2.88%	152,901	13Fas of Mar 31, 2026
Vanguard Capital Management LLCInstitution	2.11%	112,040	13Fas of Mar 31, 2026
Aju Ib Investment Co., Ltd.Institution	1.78%	94,334	13Fas of Mar 31, 2026
Mariner, LLCInstitution	0.95%	50,566	13Fas of Mar 31, 2026
Geode Capital Management, LLCInstitution	0.67%	35,425	13Fas of Mar 31, 2026
Deltec Asset Management LLCInstitution	0.64%	33,750	13Fas of Mar 31, 2026
Rangeley Capital, LLCInstitution	0.57%	30,130	13Fas of Mar 31, 2026
GTS Securities LLCInstitution	0.41%	22,016	13Fas of Mar 31, 2026
ADAR1 Capital Management, LLCInstitution	0.39%	20,535	13Fas of Mar 31, 2026
Citadel Advisors LLCInstitution	0.37%	19,886	13Fas of Mar 31, 2026
BlackRock, Inc.Institution	0.33%	17,486	13Fas of Mar 31, 2026
Vanguard Fiduciary Trust CoInstitution	0.26%	13,547	13Fas of Mar 31, 2026
Dimensional Fund Advisors LPInstitution	0.21%	11,280	13Fas of Mar 31, 2026
XTX Topco LtdInstitution	0.21%	11,226	13Fas of Mar 31, 2026

13F — a manager's quarterly holdings

Institutions13F, as of Mar 31, 2026

38 holders · 4.67M shares

Holder	Shares	% outstanding	Filed
FMR LLC	793.5K	14.94%	May 15, 2026
Viking Global Investors LP	524.3K	9.87%	May 15, 2026
Cormorant Asset Management, LP	400.0K	7.53%	May 15, 2026
TPG GP A, LLC	378.6K	7.13%	May 15, 2026
Balyasny Asset Management L.P.	376.6K	7.09%	May 15, 2026
Laurion Capital Management LP	302.8K	5.70%	May 14, 2026
Nantahala Capital Management, LLC	300.6K	5.66%	May 15, 2026
Pivotal Bioventure Partners Investment Advisor LLC	300.6K	5.66%	May 14, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
ADAR1 Capital Management, LLC	17.50%	926.4K	13G	Jun 5, 2026 ↗
Viking Global Investors LP	9.99%	529.0K	13G	May 15, 2026 ↗
Cormorant Asset Management, LP	7.56%	400.0K	13G	May 15, 2026 ↗
TPG GP A, LLCincl. James G. Coulter, Jon Winkelried	7.20%	378.6K	13D	Mar 3, 2026 ↗
Balyasny Asset Management L.P.	7.12%	376.6K	13G	May 15, 2026 ↗
FMR LLC	7.10%	372.8K	13G	Mar 6, 2026 ↗
Laurion Capital Management LP	5.72%	302.8K	13G	Apr 29, 2026 ↗
Nantahala Capital Management, LLC	5.68%	300.6K	13G	May 15, 2026 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
May 18, 2026	ADAR1 Capital Management, LLC10 percent owner	Purchase	6,009	$13.98	916,152
May 19, 2026	ADAR1 Capital Management, LLC10 percent owner	Purchase · 2 lots	10,200	$13.98	926,352
May 13, 2026	ADAR1 Capital Management, LLC10 percent owner	Purchase · 2 lots	79,259	$13.99	909,843
May 15, 2026	ADAR1 Capital Management, LLC10 percent owner	Purchase · 2 lots	300	$13.90	910,143
May 11, 2026	ADAR1 Capital Management, LLC10 percent owner	Purchase · 3 lots	50,000	$14.00	829,784
May 12, 2026	ADAR1 Capital Management, LLC10 percent owner	Purchase	800	$13.83	830,584
May 4, 2026	ADAR1 Capital Management, LLC10 percent owner	Purchase · 2 lots	120,804	$13.97	744,683
May 5, 2026	ADAR1 Capital Management, LLC10 percent owner	Purchase	35,101	$14.00	779,784
Feb 23, 2026	Jonathan I. Lieberofficer: Chief Financial Officer	Sale	789	$5.06	4,115

CongressHouse and Senate disclosures

Not reported.