RLYB
Rallybio Corp
$15.82
-0.13 (-0.78%)
At close · Jul 2
Market Cap
$83.79M
Shares
5,298,137
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: $49,532,888
Total Shares: 5,522,064
Institutional Ownership Trend
2 quarters
Superinvestors Holding RLYB
All superinvestors →Holder Concentration
Across 38 13F filers · Δ vs Dec 31, 2025Top Holder
17.0%
−83.0 pts
Top 5
53.0%
−47.0 pts
Top 10
82.7%
−17.3 pts
HHI
836
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:
+90156.7%
Shares held:
+55120.6%
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mid Cormorant Asset Management, LP | 800,000 | $7,176,000 | |
| Mega FMR LLC | 793,451 | $7,117,254 | |
| Mid Laurion Capital Management LP | 605,512 | $5,431,442 | |
| Large VIKING GLOBAL INVESTORS LP | 524,347 | $4,703,392 | |
| Mid TPG GP A, LLC | 378,551 | $3,395,602 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Large CAPTRUST FINANCIAL ADVISORS | 10,000 | $54,880 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega FMR LLC | $7,117,254 | 14.37% | 793,451 | Shares | Defined | 2026-05-15 | ||||
| Large VIKING GLOBAL INVESTORS LP | $4,703,392 | 9.50% | 524,347 | Shares | Sole | 2026-05-15 | ||||
| Mid Cormorant Asset Management, LP | $3,588,000 | 7.24% | 400,000 | Shares | Sole | 2026-05-15 | ||||
| Mid Cormorant Asset Management, LP | $3,588,000 | 7.24% | 400,000 | Shares | Defined | 2026-05-15 | ||||
| Mid TPG GP A, LLC | $3,395,602 | 6.86% | 378,551 | Shares | Defined | 2026-05-15 | ||||
| Large Balyasny Asset Management L.P. | $3,377,859 | 6.82% | 376,573 | Shares | Sole | 2026-05-15 | ||||
| Mid Laurion Capital Management LP | $2,715,721 | 5.48% | 302,756 | Shares | Sole | 2026-04-29 | ||||
| Mid Laurion Capital Management LP | $2,715,721 | 5.48% | 302,756 | Shares | Sole | 2026-05-14 | ||||
| Mid Nantahala Capital Management, LLC | $2,696,695 | 5.44% | 300,635 | Shares | Sole | 2026-05-15 | ||||
| Small Pivotal bioVenture Partners Investment Advisor LLC Venture Capital | $2,696,193 | 5.44% | 300,579 | Shares | Defined | 2026-05-14 | ||||
| Small 5AM Venture Management, LLC | $2,617,338 | 5.28% | 291,788 | Shares | Sole | 2026-05-15 | ||||
| Small Almitas Capital LLC | $1,715,117 | 3.46% | 191,206 | Shares | Sole | 2026-05-15 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $1,404,047 | 2.83% | 156,527 | Shares | Sole | 2026-05-14 | ||||
| Small JOHNSON & JOHNSON | $1,371,521 | 2.77% | 152,901 | Shares | Sole | 2026-04-13 | ||||
| Small JOHNSON & JOHNSON | $1,371,521 | 2.77% | 152,901 | Shares | Defined | 2026-05-13 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $1,004,998 | 2.03% | 112,040 | Shares | Defined | 2026-05-15 | ||||
| Micro AJU IB Investment Co., Ltd. | $846,175 | 1.71% | 94,334 | Shares | Sole | 2026-05-08 | ||||
| Large Mariner, LLC | $453,577 | 0.92% | 50,566 | Shares | Sole | 2026-05-13 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $317,761 | 0.64% | 35,425 | Shares | Defined | 2026-05-15 | ||||
| Small DELTEC ASSET MANAGEMENT LLC | $302,737 | 0.61% | 33,750 | Shares | Sole | 2026-04-24 | ||||
| Small Rangeley Capital, LLC | $270,266 | 0.55% | 30,130 | Shares | Sole | 2026-05-15 | ||||
| Mid GTS SECURITIES LLC Broker-Dealer | $197,483 | 0.40% | 22,016 | Shares | Defined | 2026-05-15 | ||||
| Mid ADAR1 Capital Management, LLC | $184,198 | 0.37% | 20,535 | Shares | Sole | 2026-05-18 | ||||
| Mega CITADEL ADVISORS LLC | $178,377 | 0.36% | 19,886 | Shares | Defined | 2026-05-15 | ||||
| Mega BlackRock, Inc. | $156,849 | 0.32% | 17,486 | Shares | Sole | 2026-05-13 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $121,516 | 0.25% | 13,547 | Shares | Defined | 2026-05-08 | ||||
| Mega DIMENSIONAL FUND ADVISORS LP | $101,181 | 0.20% | 11,280 | Shares | Sole | 2026-05-07 | ||||
| Mid XTX Topco Ltd | $100,697 | 0.20% | 11,226 | Shares | Defined | 2026-05-15 | ||||
| Large ACADIAN ASSET MANAGEMENT LLC | $93,584 | 0.19% | 10,433 | Shares | Defined | 2026-05-13 | ||||
| Mega UBS Group AG | $70,987 | 0.14% | 7,914 | Shares | Defined | 2026-05-05 | ||||
| Mega JPMORGAN CHASE & CO | $22,397 | 0.05% | 2,497 | Shares | Defined | 2026-05-13 | ||||
| Mega Vanguard Global Advisers, LLC | $12,934 | 0.03% | 1,442 | Shares | Defined | 2026-05-08 | ||||
| Mid Tower Research Capital LLC (TRC) | $8,135 | 0.02% | 907 | Shares | Defined | 2026-05-15 | ||||
| Small Hartford Financial Management Inc. | $7,283 | 0.01% | 812 | Shares | Sole | 2026-04-16 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $4,700 | 0.01% | 524 | Shares | Defined | 2026-04-28 | ||||
| Mega MORGAN STANLEY | $1,129 | 0.00% | 126 | Shares | Defined | 2026-05-15 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $1,076 | 0.00% | 120 | Shares | Defined | 2026-05-12 | ||||
| Micro Fortitude Family Office, LLC Family Office | $475 | 0.00% | 53 | Shares | Sole | 2026-04-16 | ||||
| Mega WELLS FARGO & COMPANY/MN | $331 | 0.00% | 37 | Shares | Defined | 2026-05-11 | ||||
| Mid Allworth Financial LP | $53 | 0.00% | 6 | Shares | Sole | 2026-05-15 | ||||
| Large DANSKE BANK A/S Bank | $8 | 0.00% | 1 | Shares | Sole | 2026-05-12 | ||||
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