Latest Period
Q4 2025
Security Snapshot
Rallybio Corp - Common Stock, par value $0.0001 per share (RLYB) Institutional Ownership
CUSIP: 75120L100
13F Institutional Holders and Ownership History from Q3 2021 to Q1 2026
Institutions Reporting
44
Shares (Excl. Options)
24,166,490
Price
$0.69
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- Type / Class
- Equity / Common Stock, par value $0.0001 per share
- Symbol
- RLYB on Nasdaq
- Shares outstanding
- 5,292,937
- 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, par value $0.0001 per share is tracked under CUSIP 75120L100.
- 44 institutions reported positions in Q4 2025.
- 5 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
Open SEC Evidence
Latest holder context comes from 44 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 75120L100?
CUSIP 75120L100 identifies RLYB - Rallybio Corp - Common Stock, par value $0.0001 per share in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 75120L100:
Significant Owners of Rallybio Corp - Common Stock, par value $0.0001 per share (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 | |||
| Laurion Capital Management LP | 5.7% | $175,598 | 302,756 | Laurion Capital Management LP | 31 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, par value $0.0001 per share (RLYB). This represents 457% of the company’s total 5,292,937 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Rallybio Corp - Common Stock, par value $0.0001 per share (RLYB) together control 454% 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 | 79% | 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 | 45% | 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 | 7.6% | 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 | 0.4% | 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, par value $0.0001 per share (RLYB) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 0 | $0 | -$378,722 | $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 |