🕵️ Rallybio Corp ($RLYB)

SEC insider & ownership activity, last 12 months · CIK 1739410 · every row links its SEC filing

Over the last 12 months insiders sold $4K against $4.2M of open-market buying. ADAR1 Capital Management, LLC bought $4.2M (May). One red-flag 8-K in the window: Delisting notice (3.01), Aug 26, 2025.

Aug 2025: net +$0 Sep 2025: net +$0 Oct 2025: net +$0 Nov 2025: net +$0 Dec 2025: net +$0 Jan 2026: net +$0 Mar 2026: net +$0 Mar 2026: net +$0 Apr 2026: net +$0 May 2026: net +$4.2M Jun 2026: net +$0 Jul 2026: net +$0
Monthly net open-market insider flow, last 12 months (up = net buying)

Insider flow

1 buyer, $4.2M (14 lots) · 1 seller, $4K (1 lots)

InsiderBuysBoughtSellsSoldLast
ADAR1 Capital Management, LLC14$4.2M 0–May 19, 2026
Jonathan I. Lieber0– 1$4KFeb 23, 2026

5%+ holders

HolderStakeClassScheduleEvent
ADAR1 Capital Management, LLC 17.5% 13GJun 5, 2026 filing ↗
Daniel Schneeberger 17.5% 13GJun 5, 2026 filing ↗
FMR LLC 10.6% 13GMar 6, 2026 filing ↗
Abigail P. Johnson 10.6% 13GMar 6, 2026 filing ↗
Viking Global Investors LP 10.0% 13GMay 15, 2026 filing ↗
Viking Global Opportunities Parent GP LLC 10.0% 13GMay 15, 2026 filing ↗
Viking Global Opportunities GP LLC 10.0% 13GMay 15, 2026 filing ↗
Viking Global Opportunities Portfolio GP LLC 10.0% 13GMay 15, 2026 filing ↗
Viking Global Opportunities Illiquid Investments Sub-Master LP 10.0% 13GMay 15, 2026 filing ↗
Halvorsen Ole Andreas 10.0% 13GMay 15, 2026 filing ↗
Shabet Rose Sharon 10.0% 13GMay 15, 2026 filing ↗
David C. Ott 10.0% 13GFeb 17, 2026 filing ↗
Cormorant Asset Management, LP 7.6% 13GMay 15, 2026 filing ↗
Bihua Chen 7.6% 13GMay 15, 2026 filing ↗
TPG GP A, LLC 7.2% 13DMar 1, 2026 filing ↗
James G. Coulter 7.2% 13DMar 1, 2026 filing ↗
Jon Winkelried 7.2% 13DMar 1, 2026 filing ↗
Balyasny Asset Management L.P. 7.1% 13GMay 15, 2026 filing ↗
BAM GP LLC 7.1% 13GMay 15, 2026 filing ↗
Balyasny Asset Management Holdings LP 7.1% 13GMay 15, 2026 filing ↗
Dames GP LLC 7.1% 13GMay 15, 2026 filing ↗
Dmitry Balyasny 7.1% 13GMay 15, 2026 filing ↗
Laurion Capital Management LP 5.7% 13GApr 29, 2026 filing ↗
Benjamin Alexander Smith 5.7% 13GApr 29, 2026 filing ↗
Janaka Sheehan Maduraperuma 5.7% 13GApr 29, 2026 filing ↗
Nantahala Capital Management, LLC 5.7% 13GMay 15, 2026 filing ↗
Wilmot B. Harkey 5.7% 13GMay 15, 2026 filing ↗
Daniel Mack 5.7% 13GMay 15, 2026 filing ↗

Planned insider sales (Form 144)

No sale notices filed in the last 12 months.

Material events (8-K)

ItemEvent date
Material agreement (1.01)May 31, 2026 filing ↗
Unregistered equity sale (3.02)May 31, 2026 filing ↗
Change of control (5.01)May 31, 2026 filing ↗
Officer/director changes (5.02)May 31, 2026 filing ↗
Reg FD disclosure (7.01)May 31, 2026 filing ↗
Financial Statements and Exhibits (9.01)May 31, 2026 filing ↗
Agreement terminated (1.02)May 3, 2026 filing ↗
Financial Statements and Exhibits (9.01)May 3, 2026 filing ↗
Officer/director changes (5.02)Mar 31, 2026 filing ↗
Material agreement (1.01)Mar 1, 2026 filing ↗
Unregistered equity sale (3.02)Mar 1, 2026 filing ↗
Change of control (5.01)Mar 1, 2026 filing ↗
Officer/director changes (5.02)Mar 1, 2026 filing ↗
Reg FD disclosure (7.01)Mar 1, 2026 filing ↗
Financial Statements and Exhibits (9.01)Mar 1, 2026 filing ↗
Charter/bylaw changes (5.03)Jan 26, 2026 filing ↗
Shareholder vote (5.07)Jan 26, 2026 filing ↗
Financial Statements and Exhibits (9.01)Jan 26, 2026 filing ↗
Earnings (2.02)Nov 6, 2025 filing ↗
Financial Statements and Exhibits (9.01)Nov 6, 2025 filing ↗
Delisting notice (3.01)Aug 26, 2025 filing ↗
Financial Statements and Exhibits (9.01)Aug 26, 2025 filing ↗
Earnings (2.02)Aug 7, 2025 filing ↗
Financial Statements and Exhibits (9.01)Aug 7, 2025 filing ↗