Insider Transactions Reported by 22 Insiders of Rallybio Corp

Symbol: RLYB on Nasdaq
Location: New Haven, CT

Key facts

RLYB - Rallybio Corp has 22 insiders with reported activity on this page.
Net insider value flow over the last year: +$8,458,527.
Recent transaction rows are available for direct filing-level review.

Change

Buy value: $8,458,527; sell value: $0.
Net share flow: +604,946.

Research use

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to buying over the last 12 months. Net value: +$8,458,527.

Buys

$8,458,527

Shares: 604,946

Insiders: 2

Sells

Shares: 0

Insiders: 0

Net

+$8,458,527

Shares: +604,946

Insiders: 2

Window (months)	Buy shares	Buy $	Sell $	Net $
0-3	604,946	$8,458,527	$0	+$8,458,527
3-6	0	$0	$0	$0
6-9	0	$0	$0	$0
9-12	0	$0	$0	$0

Rallybio Corp executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
5AM Opportunities I, L.P.	10%+ Owner	$30,591,937			Mixed	03 Jun 2022
5AM Partners V, LLC	10%+ Owner	$29,771,937			Mixed	07 Mar 2023
5AM Ventures V, L.P.	10%+ Owner	$22,833,933			Mixed	29 Jul 2021
ADAR1 Capital Management, LLC	10%+ Owner	$12,783,657	+$4,229,263	+49%	Filing P/S	18 May 2026
Daniel Schneeberger	10%+ Owner	$12,783,657	+$4,229,263	+49%	Filing P/S	18 May 2026
Jeffrey M. Fryer	Chief Financial Officer & Treasurer	$385,794			Mixed	21 Mar 2022
Stephen Uden	Chief Executive Officer, Director	$317,590			Mixed	14 Feb 2025
Steven Ryder	Chief Medical Officer	$126,000			Mixed	14 Feb 2025
FMR LLC	Other*, 10%+ Owner	$122,842			Market	04 Mar 2026
Robert Lorne Hopfner	Director	$80,705			Mixed	13 May 2025
Hui Liu	Director	$76,705			Mixed	13 May 2025
Martin Mackay	Director	$64,998			Mixed	18 Feb 2026
Ronald Hunt	Director	$51,498			Mixed	18 Feb 2026
Wendy Chung	Director	$29,205			Mixed	13 May 2025
Kush Parmar	Director	$29,205			Mixed	15 May 2024
Paula Soteropoulos	Director	$29,205			Mixed	13 May 2025
Christine A. Nash	Director	$29,205			Mixed	13 May 2025
Helen M. Boudreau	Director	$29,205			Mixed	13 May 2025
Timothy M. Shannon	Director	$10,693			Mixed	03 Jan 2022
Jonathan I. Lieber	Chief Financial Officer	$2,823			Mixed	18 Feb 2026
VIKING GLOBAL INVESTORS LP	10%+ Owner				Mixed	15 Nov 2022
Lucian Iancovici	Director				Mixed	29 Jul 2021

Top shareholders of Rallybio Corp (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
FMR LLC	13F 13D/G 3/4/5	Company · Other*, 10%+ Owner	11% from 13D/G	793,451	$7,117,256	—	31 Mar 2026	13F 13D/G 3/4/5
VIKING GLOBAL INVESTORS LP	13F 13D/G 3/4/5	Company · 10%+ Owner	10% from 13D/G	524,347	$4,703,393	—	31 Mar 2026	13F 13D/G 3/4/5
Cormorant Asset Management, LP	13F 13D/G	Company	7.6% from 13D/G	400,000	$3,588,000	—	31 Mar 2026	13F 13D/G
TPG GP A, LLC	13F 13D/G	Company	7.2% from 13D/G	378,551	$3,395,602	—	31 Mar 2026	13F 13D/G
BALYASNY ASSET MANAGEMENT L.P.	13F 13D/G	Company	7.1% from 13D/G	376,573	$3,377,860	—	31 Mar 2026	13F 13D/G
Laurion Capital Management LP	13F 13D/G	Company	5.7% from 13D/G	302,756	$2,715,721	—	31 Mar 2026	13F 13D/G
Nantahala Capital Management, LLC	13F 13D/G	Company	5.7% from 13D/G	300,635	$2,696,696	—	31 Mar 2026	13F 13D/G
JOHNSON & JOHNSON	13F 13D/G	Company	2.9% from 13D/G	152,901	$1,371,522	—	31 Mar 2026	13F 13D/G
ADAR1 Capital Management, LLC	3/4/5 13F	10%+ Owner · Company	17%	926,352	$12,783,657	+$4,229,263	18 May 2026	3/4/5 13F
Daniel Schneeberger	3/4/5	10%+ Owner	17%	926,352	$12,783,657	+$4,229,263	18 May 2026	3/4/5
Jonathan I. Lieber	3/4/5	Chief Financial Officer	0.08%	4,115	$2,823	—	18 Feb 2026	3/4/5
Pivotal bioVenture Partners Investment Advisor LLC	13F	Company	5.7%	300,579	$2,696,194	—	31 Mar 2026	13F
5AM Venture Management, LLC	13F	Company	5.5%	291,788	$2,617,338	—	31 Mar 2026	13F
Almitas Capital LLC	13F	Company	3.6%	191,206	$1,715,118	—	31 Mar 2026	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	3%	156,527	$1,404,047	—	31 Mar 2026	13F
VANGUARD CAPITAL MANAGEMENT LLC	13F	Company	2.1%	112,040	$1,004,999	—	31 Mar 2026	13F
AJU IB Investment Co., Ltd.	13F	Company	1.8%	94,334	$846,176	—	31 Mar 2026	13F
Mariner, LLC	13F	Company	0.95%	50,566	$453,577	—	31 Mar 2026	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.67%	35,425	$317,821	—	31 Mar 2026	13F
DELTEC ASSET MANAGEMENT LLC	13F	Company	0.64%	33,750	$302,737	—	31 Mar 2026	13F
Rangeley Capital, LLC	13F	Company	0.57%	30,130	$270,266	—	31 Mar 2026	13F
GTS SECURITIES LLC	13F	Company	0.42%	22,016	$197,484	—	31 Mar 2026	13F
CITADEL ADVISORS LLC	13F	Company	0.38%	19,886	$178,377	—	31 Mar 2026	13F
BlackRock, Inc.	13F	Company	0.33%	17,486	$156,849	—	31 Mar 2026	13F
VANGUARD FIDUCIARY TRUST CO	13F	Company	0.26%	13,547	$121,517	—	31 Mar 2026	13F
DIMENSIONAL FUND ADVISORS LP	13F	Company	0.21%	11,280	$101,182	—	31 Mar 2026	13F
XTX Topco Ltd	13F	Company	0.21%	11,226	$100,697	—	31 Mar 2026	13F
ACADIAN ASSET MANAGEMENT LLC	13F	Company	0.2%	10,433	$92,000	—	31 Mar 2026	13F
UBS Group AG	13F	Company	0.15%	7,914	$70,989	—	31 Mar 2026	13F
JPMORGAN CHASE & CO	13F	Company	0.05%	2,497	$20,076	—	31 Mar 2026	13F
Vanguard Global Advisers, LLC	13F	Company	0.03%	1,442	$12,935	—	31 Mar 2026	13F
Tower Research Capital LLC (TRC)	13F	Company	0.02%	907	$8,136	—	31 Mar 2026	13F
Hartford Financial Management Inc.	13F	Company	0.02%	812	$7,284	—	31 Mar 2026	13F
SBI Securities Co., Ltd.	13F	Company	0.01%	524	$4,700	—	31 Mar 2026	13F
MORGAN STANLEY	13F	Company	0%	126	$1,130	—	31 Mar 2026	13F
BNP PARIBAS FINANCIAL MARKETS	13F	Company	0%	120	$1,076	—	31 Mar 2026	13F
Fortitude Family Office, LLC	13F	Company	0%	53	$475	—	31 Mar 2026	13F
WELLS FARGO & COMPANY/MN	13F	Company	0%	37	$332	—	31 Mar 2026	13F
Allworth Financial LP	13F	Company	0%	6	$54	—	31 Mar 2026	13F
DANSKE BANK A/S	13F	Company	0%	1	$9	—	31 Mar 2026	13F
5AM Opportunities I, L.P.	3/4/5	10%+ Owner	— class O/S missing	3,730,724	$30,591,937	—	03 Jun 2022	3/4/5
5AM Partners V, LLC	3/4/5	10%+ Owner	— class O/S missing	3,630,724	$29,771,937	—	07 Mar 2023	3/4/5
5AM Ventures V, L.P.	3/4/5	10%+ Owner	— class O/S missing	2,784,626	$22,833,933	—	29 Jul 2021	3/4/5
Jeffrey M. Fryer	3/4/5	Chief Financial Officer & Treasurer	— class O/S missing	47,048	$385,794	—	21 Mar 2022	3/4/5
Stephen Uden	3/4/5	Chief Executive Officer, Director	— class O/S missing	453,700	$317,590	—	14 Feb 2025	3/4/5
Steven Ryder	3/4/5	Chief Medical Officer	— class O/S missing	180,000	$126,000	—	14 Feb 2025	3/4/5
Robert Lorne Hopfner	3/4/5	Director	— class O/S missing	45,000	$80,705	—	13 May 2025	3/4/5
Hui Liu	3/4/5	Director	— class O/S missing	45,000	$76,705	—	13 May 2025	3/4/5
Martin Mackay	3/4/5	Director	— class O/S missing	18,055	$64,998	—	18 Feb 2026	3/4/5
Ronald Hunt	3/4/5	Director	— class O/S missing	14,305	$51,498	—	18 Feb 2026	3/4/5

Recent Insider Transactions by Companies or Individuals for Rallybio Corp

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	1.11%	$142,582	$13.98	10,200	926,352	19 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	1.11%	$142,582	$13.98	10,200	926,352	19 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	0.66%	$83,981	$13.98	6,009	916,152	18 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	0.66%	$83,981	$13.98	6,009	916,152	18 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	0.03%	$4,170	$13.90	300	910,143	15 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	0.03%	$4,170	$13.90	300	910,143	15 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	9.54%	$1,108,807	$13.99	79,259	909,843	13 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	9.54%	$1,108,807	$13.99	79,259	909,843	13 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	0.1%	$11,063	$13.83	800	830,584	12 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	0.1%	$11,063	$13.83	800	830,584	12 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	6.41%	$699,992	$14.00	50,000	829,784	11 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	6.41%	$699,992	$14.00	50,000	829,784	11 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	4.71%	$491,260	$14.00	35,101	779,784	05 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	4.71%	$491,260	$14.00	35,101	779,784	05 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	19.4%	$1,687,409	$13.97	120,804	744,683	04 May 2026	See Footnote
ADAR1 Capital Management, LLC	RLYB	Common Stock	Purchase	19.4%	$1,687,409	$13.97	120,804	744,683	04 May 2026	See Footnote
Jonathan I. Lieber	RLYB	Common Stock	Sale	-16.1%			-789	4,115	23 Feb 2026	Direct
Jonathan I. Lieber	RLYB	Common Stock	Award	104%			2,500	4,904	18 Feb 2026	Direct
Martin Mackay	RLYB	Option (Right to Buy)	Award				18,055	18,055	18 Feb 2026	Direct
Ronald Hunt	RLYB	Option (Right to Buy)	Award				14,305	14,305	18 Feb 2026	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.