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Equibles

RLYB

Rallybio Corp

Company with tickers: RLYB

CIK
1739410
CUSIP
75120L209
Shares Outstanding
5,800,000
13F Activity (30d)
32 filings 32 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 38
Total Value: $41,857,646
Total Shares: 4,666,407

Institutional Ownership Trend

2 quarters

Holder Concentration

Across 38 13F filers · Δ vs Dec 31, 2025
Top Holder
17.0%
Dec 2025 → Mar 2026 · range 17.0% – 100.0%
−83.0 pts
Top 5
53.0%
Dec 2025 → Mar 2026 · range 53.0% – 100.0%
−47.0 pts
Top 10
82.7%
Dec 2025 → Mar 2026 · range 82.7% – 100.0%
−17.3 pts
HHI
836
Dec 2025 → Mar 2026 · range 836 – 10,000
Broadly held −9,164

Quarterly Activity

vs Dec 31, 2025
New
38
Increased
0
Decreased
0
Sold Out
1
Unchanged
0
Holder count: +37
Institutional value: +76171.2%
Shares held: +46564.1%

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega FMR LLC 793,451 $7,117,254
Large VIKING GLOBAL INVESTORS LP 524,347 $4,703,392
Mid Cormorant Asset Management, LP 400,000 $3,588,000
Mid TPG GP A, LLC 378,551 $3,395,602
Large Balyasny Asset Management L.P. 376,573 $3,377,859

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Large CAPTRUST FINANCIAL ADVISORS 10,000 $54,880
Filter: New 38 Increased 0 Reduced 0 Sold out 1 Unchanged 0
Showing 38 of 38
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega FMR LLC $7,117,254 17.00% 793,451
Large VIKING GLOBAL INVESTORS LP $4,703,392 11.24% 524,347
Mid Cormorant Asset Management, LP $3,588,000 8.57% 400,000
Mid TPG GP A, LLC $3,395,602 8.11% 378,551
Large Balyasny Asset Management L.P. $3,377,859 8.07% 376,573
Mid Laurion Capital Management LP $2,715,721 6.49% 302,756
Mid Nantahala Capital Management, LLC $2,696,695 6.44% 300,635
Small Pivotal bioVenture Partners Investment Advisor LLC Venture Capital $2,696,193 6.44% 300,579
Small 5AM Venture Management, LLC $2,617,338 6.25% 291,788
Small Almitas Capital LLC $1,715,117 4.10% 191,206
Large RENAISSANCE TECHNOLOGIES LLC $1,404,047 3.35% 156,527
Small JOHNSON & JOHNSON $1,371,521 3.28% 152,901
Mega VANGUARD CAPITAL MANAGEMENT LLC $1,004,998 2.40% 112,040
Micro AJU IB Investment Co., Ltd. $846,175 2.02% 94,334
Large Mariner, LLC $453,577 1.08% 50,566
Mega GEODE CAPITAL MANAGEMENT, LLC $317,761 0.76% 35,425
Small DELTEC ASSET MANAGEMENT LLC $302,737 0.72% 33,750
Small Rangeley Capital, LLC $270,266 0.65% 30,130
Mid GTS SECURITIES LLC Broker-Dealer $197,483 0.47% 22,016
Mid ADAR1 Capital Management, LLC $184,198 0.44% 20,535
Mega CITADEL ADVISORS LLC $178,377 0.43% 19,886
Mega BlackRock, Inc. $156,849 0.37% 17,486
Mega VANGUARD FIDUCIARY TRUST CO Bank $121,516 0.29% 13,547
Mega DIMENSIONAL FUND ADVISORS LP $101,181 0.24% 11,280
Mid XTX Topco Ltd $100,697 0.24% 11,226
Large ACADIAN ASSET MANAGEMENT LLC $93,584 0.22% 10,433
Mega UBS Group AG $70,987 0.17% 7,914
Mega JPMORGAN CHASE & CO $22,397 0.05% 2,497
Mega Vanguard Global Advisers, LLC $12,934 0.03% 1,442
Mid Tower Research Capital LLC (TRC) $8,135 0.02% 907
Small Hartford Financial Management Inc. $7,283 0.02% 812
Mid SBI Securities Co., Ltd. Broker-Dealer $4,700 0.01% 524
Mega MORGAN STANLEY $1,129 0.00% 126
Mega BNP PARIBAS ARBITRAGE, SA $1,076 0.00% 120
Micro Fortitude Family Office, LLC Family Office $475 0.00% 53
Mega WELLS FARGO & COMPANY/MN $331 0.00% 37
Mid Allworth Financial LP $53 0.00% 6
Large DANSKE BANK A/S Bank $8 0.00% 1

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