Security key
75120L100
Rallybio Corporation - Common Stock, par value $0.0001 per share (RLYB)
CUSIP: 75120L100
Q1 2023 13F Holders as of 31 Mar 2023
- Security type / class
- Equity / Common Stock, par value $0.0001 per share
- Total 13F shares
- 32,110,359
- Total 13F value
- $183,344,535
- Share change
- -203,373
- SEC-reported price per share
- $5.71
- Number of holders
- 51
- Value change
- -$1,268,660
- Number of buys
- 21
- Number of sells
- 22
- Shares outstanding
- 5,294,835
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2023
Institutions
51
Top holders
10
RLYB full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q3 2025
Rallybio Corp SEC filings
Rallybio Corp company facts
Broader feeds
Reporting periods
Holder history for CUSIP 75120L100
Recent filing periods:
Ownership snapshot
Top reported holders of RLYB - Rallybio Corporation - Common Stock, par value $0.0001 per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
VIKING GLOBAL INVESTORS LP
Disclosed value leader
VIKING GLOBAL INVESTORS LP
Comparable rows
15/15
Latest evidence
31 Dec 2022
13F
3/4/5
Lead comparable stake: 79%
Showing 1-6 of 15 holder rows.
Quick read
VIKING GLOBAL INVESTORS LP leads the comparable SEC ownership view at 79%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens VIKING GLOBAL INVESTORS LP's linked filing trail.
Comparable ownership
Top 5
VIKING GLOBAL INVESTORS LP
79%
5AM Venture Management, LLC
70%
New Leaf Venture Partners, L.L.C.
62%
FMR LLC
61%
TPG GP A, LLC
57%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| VIKING GLOBAL INVESTORS LP |
13F
3/4/5
Company · 10%+ Owner
|
79%
|
$27,559,685
4,194,777 shares
|
— | 31 Dec 2022 |
| 5AM Venture Management, LLC |
13F
Company
|
70%
|
$24,510,857
3,730,724 shares
|
— | 31 Dec 2022 |
| New Leaf Venture Partners, L.L.C. |
13F
Company
|
62%
|
$21,691,532
3,301,603 shares
|
— | 31 Dec 2022 |
| FMR LLC |
13F
Company
|
61%
|
$21,322,442
3,245,425 shares
|
— | 31 Dec 2022 |
| TPG GP A, LLC |
13F
Company
|
57%
|
$19,896,680
3,028,414 shares
|
— | 31 Dec 2022 |
| Pivotal bioVenture Partners Investment Advisor LLC |
13F
Company
|
45%
|
$15,798,511
2,404,644 shares
|
— | 31 Dec 2022 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2023
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
51
Shares
32,110,359
Rows available
51
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2023 vs Q4 2025 Across Filers
Q4 2025 holders
44
Q1 2023 holders
51
Holder diff
7
| Investor | Q4 2025 Shares | Q1 2023 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2023 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend