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
- 5,299,981
Holder snapshot
6 facts
Security identity
1 fact
Report period
Q1 2026
Institutions
38
Top holders
10
RLYB full security history
Ownership snapshot
Full 13F holder table
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
FMR LLC
Disclosed value leader
5AM Ventures V, L.P.
Comparable rows
15/15
Latest evidence
31 Mar 2026
13D/G
3/4/5
13F
Lead comparable stake: 11%
13D/G row: FMR LLC
Showing 1-6 of 15 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 11%.
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.
Comparable ownership
Top 5
FMR LLC
11%
VIKING GLOBAL INVESTORS LP
10%
Cormorant Asset Management, LP
7.6%
TPG GP A, LLC
7.2%
BALYASNY ASSET MANAGEMENT L.P.
7.1%
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 |
|---|---|---|---|---|---|
| FMR LLC |
13D/G
3/4/5
13F
Other*, 10%+ Owner · Company
|
11%
|
$2,679,776
561,798 shares
|
+$901,392 | 04 Mar 2026 |
| 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 |
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