Security key
75120L209
- Security type / class
- Equity / COMMON STOCK
- Total 13F shares
- 4,666,407
- Total 13F value
- $41,853,824
- Share change
- +4,529,258
- SEC-reported price per share
- $8.97
- Number of holders
- 38
- Value change
- +$40,706,436
- Number of buys
- 34
- Number of sells
- 1
- Shares outstanding
- 5,298,133
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2026
Institutions
38
Top holders
10
RLYB full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2026
Previous quarter: Q4 2025
Rallybio Corp SEC filings
Rallybio Corp company facts
Broader feeds
Reporting periods
Holder history for CUSIP 75120L209
Recent filing periods:
Ownership snapshot
Top reported holders of RLYB - Rallybio Corp - COMMON STOCK (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
5AM Ventures V, L.P.
Comparable rows
15/15
Latest evidence
31 Mar 2026
13F
13D/G
3/4/5
Lead comparable stake: 10%
13D/G row: VIKING GLOBAL INVESTORS LP
Showing 1-6 of 15 holder rows.
Quick read
VIKING GLOBAL INVESTORS LP leads the comparable SEC ownership view at 10%.
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
10%
Cormorant Asset Management, LP
7.6%
TPG GP A, LLC
7.2%
BALYASNY ASSET MANAGEMENT L.P.
7.1%
Laurion Capital Management LP
5.7%
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
13D/G
3/4/5
Company · 10%+ Owner
|
10%
from 13D/G
|
$2,878,037
4,194,777 shares
|
— | 31 Dec 2025 |
| Cormorant Asset Management, LP |
13D/G
|
7.6%
|
$232,000
400,000 shares
|
$0 | 31 Mar 2026 |
| TPG GP A, LLC |
13F
13D/G
Company
|
7.2%
from 13D/G
|
$2,089,606
3,028,414 shares
|
— | 31 Dec 2025 |
| BALYASNY ASSET MANAGEMENT L.P. |
13D/G
|
7.1%
|
$218,412
376,573 shares
|
$0 | 31 Mar 2026 |
| Laurion Capital Management LP |
13D/G
|
5.7%
|
$175,598
302,756 shares
|
$0 | 31 Mar 2026 |
| Nantahala Capital Management, LLC |
13D/G
|
5.7%
|
$174,368
300,635 shares
|
$0 | 31 Mar 2026 |
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 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
38
Shares
4,666,407
Rows available
38
| 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 2026 vs Q4 2025 Across Filers
Q4 2025 holders
1
Q1 2026 holders
38
Holder diff
37
| Investor | Q4 2025 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend