Security Snapshot

Rallybio Corp - Common Stock, $0.0001 par value (RLYB) Institutional Ownership

CUSIP: 75120L100

13F Institutional Holders and Ownership History from Q3 2021 to Q1 2026

Latest Period

Q4 2025

Institutions Reporting

44

Shares (Excl. Options)

24,166,490

Price

$0.69

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Type / Class
Equity / Common Stock, $0.0001 par value
Symbol
RLYB on Nasdaq
Shares outstanding
5,272,448
Price per share
$0.58
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
24,166,490
Total reported value
$16,590,283
% of total 13F portfolios
0%
Share change
-70,991
Value change
-$46,693
Number of holders
44
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Quick Takeaways

  • RLYB - Rallybio Corp - Common Stock, $0.0001 par value is tracked under CUSIP 75120L100.
  • 44 institutions reported positions in Q4 2025.
  • 4 significant owners is listed from Schedule 13D/13G reporting.

What Changed

  • Holder count moved from 44 to 0 between Q4 2025 and Q1 2026.
  • Reported value moved from $16,590,283 to $0.

Why This Matters

  • You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
  • 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Source Evidence

Source: SEC Form 13F

Latest holder context comes from 44 institutions filings for Q4 2025.

Open SEC Evidence

Investment Quick Answers

What is CUSIP 75120L100?
CUSIP 75120L100 identifies RLYB - Rallybio Corp - Common Stock, $0.0001 par value in SEC 13F datasets.

Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.

Significant Owners of Rallybio Corp - Common Stock, $0.0001 par value (RLYB) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
VIKING GLOBAL INVESTORS LP 10% $2,897,379 4,222,969 VIKING GLOBAL INVESTORS LP 31 Dec 2025
FMR LLC 4.3% $441,675 1,766,701 FMR LLC 31 Dec 2024
TPG GP A, LLC 7.2% $219,560 378,551 TPG GP A, LLC 01 Mar 2026
JOHNSON & JOHNSON 2.9% $88,683 152,901 Johnson & Johnson 31 Mar 2026

As of 31 Dec 2025, 44 institutional investors reported holding 24,166,490 shares of Rallybio Corp - Common Stock, $0.0001 par value (RLYB). This represents 458% of the company’s total 5,272,448 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Rallybio Corp - Common Stock, $0.0001 par value (RLYB) together control 456% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
VIKING GLOBAL INVESTORS LP 80% 4,194,777 0% 0.01% $2,878,037
JOHNSON & JOHNSON 69% 3,636,363 0% 0.45% $2,494,909
5AM Venture Management, LLC 69% 3,630,724 0% 0.78% $2,491,040
TPG GP A, LLC 57% 3,028,414 0% 0.08% $2,089,606
Pivotal bioVenture Partners Investment Advisor LLC 46% 2,404,644 0% 0.64% $1,649,586
FMR LLC 32% 1,694,388 0% 0% $1,162,520
Almitas Capital LLC 29% 1,529,653 -0.59% 0.23% $1,049,495
VANGUARD GROUP INC 19% 1,016,249 +1.7% 0% $697,147
RENAISSANCE TECHNOLOGIES LLC 16% 835,692 +17% 0% $573,368
Canaan Partners XI LLC 8.5% 450,000 0% 0.23% $308,700
Mariner, LLC 7.7% 404,546 0% 0% $277,559
CITADEL ADVISORS LLC 4.8% 253,842 -42% 0% $174,161
GEODE CAPITAL MANAGEMENT, LLC 4.7% 248,005 +1.2% 0% $170,191
BlackRock, Inc. 2.7% 141,663 0% 0% $97,195
SUSQUEHANNA INTERNATIONAL GROUP, LLP 1.9% 100,724 -26% 0% $69,107
XTX Topco Ltd 1.8% 97,313 +65% 0% $66,766
ACADIAN ASSET MANAGEMENT LLC 1.6% 83,480 -7.5% 0% $56,000
STATE STREET CORP 1.2% 62,072 0% 0% $42,588
Rangeley Capital, LLC 0.76% 40,000 -52% 0.02% $27,444
NORTHERN TRUST CORP 0.72% 38,124 0% 0% $26,157
TWO SIGMA INVESTMENTS, LP 0.7% 37,000 +72% 0% $25,386
PRUDENTIAL FINANCIAL INC 0.55% 29,100 -24% 0% $19,966
Virtu Financial LLC 0.51% 27,132 -31% 0% $19,000
HRT FINANCIAL LP 0.41% 21,387 -34% 0% $14,000
OneDigital Investment Advisors LLC 0.38% 20,000 0% 0% $13,722

Institutional Holders of Rallybio Corp - Common Stock, $0.0001 par value (RLYB) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q1 0 $0 -$13,484 $0.58 0
2025 Q4 24,166,490 $16,590,283 -$46,693 $0.69 44
2025 Q3 28,293,762 $14,121,676 -$1,021,666 $0.50 45
2025 Q2 31,192,738 $10,521,574 -$558,784 $0.34 48
2025 Q1 32,001,262 $20,918,290 -$325,165 $0.65 47
2024 Q4 32,428,353 $31,130,298 -$372,186 $0.96 49
2024 Q3 31,212,752 $36,517,099 -$480,838 $1.17 49
2024 Q2 31,632,749 $42,387,896 +$1,547,544 $1.34 64
2024 Q1 30,198,382 $55,866,389 -$3,948,463 $1.85 59
2023 Q4 31,751,116 $75,885,524 +$1,489,758 $2.39 53
2023 Q3 31,203,619 $105,155,071 -$1,411,692 $3.37 58
2023 Q2 33,260,971 $188,259,076 +$6,505,885 $5.66 57
2023 Q1 32,110,359 $183,344,535 -$1,268,660 $5.71 51
2022 Q4 32,312,322 $212,289,584 +$34,532,833 $6.57 55
2022 Q3 27,791,116 $402,136,609 +$2,162,886 $14.47 50
2022 Q2 27,659,695 $208,831,000 -$776,317 $7.55 44
2022 Q1 27,776,100 $193,896,000 +$124,771 $6.98 47
2021 Q4 26,674,067 $252,852,000 +$1,365,608 $9.54 37
2021 Q3 24,054,356 $419,896,000 +$419,896,000 $17.58 33