13F reference period
n/a
Security Snapshot
Rallybio Corporation - 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
Shares (Excl. Options)
n/a
Price
$0.58
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended.
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- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Symbol
- RLYB on Nasdaq
- Shares outstanding
- 5,294,835
- SEC-reported price per share
- $0.58
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- RLYB - Rallybio Corporation - Common Stock, par value $0.0001 per share is tracked under CUSIP 75120L100.
- 13F reference-period holder data is not available.
- 8 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder data for the Q2 2026 reference period is not available.
- Available periods remain in the history table; they do not substitute for the headline period.
Research use
- 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.
Evidence
Source: SEC Schedule 13D/G
Open SEC evidence
Ownership context comes from Schedule 13D/G and available holder history for this CUSIP.
Security key
75120L100
13F reference period
n/a
13F holders
13D/G owners
8
CIK / CUSIP context first
RLYB full holder history
Rallybio Corp SEC filings
Rallybio Corp company facts
Rallybio Corp insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 75120L100:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
8
Security
RLYB
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| FMR LLC | 4.3% | $441,675 | 1,766,701 | FMR LLC | 31 Dec 2024 | |||
| VIKING GLOBAL INVESTORS LP | 10% | 0% | $306,793 | -$2,142,529 | 528,954 | -87% | VIKING GLOBAL INVESTORS LP | 31 Mar 2026 |
| Cormorant Asset Management, LP | 7.6% | $232,000 | 400,000 | Cormorant Asset Management, LP | 31 Mar 2026 | |||
| TPG GP A, LLC | 7.2% | $219,560 | 378,551 | TPG GP A, LLC | 01 Mar 2026 | |||
| BALYASNY ASSET MANAGEMENT L.P. | 7.1% | $218,412 | 376,573 | Balyasny Asset Management L.P. | 31 Mar 2026 | |||
| Laurion Capital Management LP | 5.7% | $175,598 | 302,756 | Laurion Capital Management LP | 31 Mar 2026 | |||
| Nantahala Capital Management, LLC | 5.7% | $174,368 | 300,635 | Nantahala Capital Management, LLC | 31 Mar 2026 | |||
| JOHNSON & JOHNSON | 2.9% | $88,683 | 152,901 | Johnson & Johnson | 31 Mar 2026 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
19
Headline period
n/a
Rows shown
1-19 of 19
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 0 | $0 | -$15,892,464 | $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 |