Rallybio Corporation (RLYB) has 20 known insider and institutional holders on record. The largest holder is VIKING GLOBAL INVESTORS LP with 3,333,388 shares. Other notable holders include ROCKLAGE SCOTT M and 5AM Partners V, LLC.
Over the last 12 months, insiders have made 13 transactions in RLYB stock — 11 buys (valued at $212.4K) and 1 sells (valued at $3.99K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
RLYB Insider Ownership
Top Holder
VIKING GLOBAL INVESTORS LP
3,333,388 shares
Buys (12 mo)
11
$212.4K value
Sells (12 mo)
1
$3.99K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Viking Global Investors Lp |
Director |
3,333,388 |
2022-11-17 |
|
| 2 |
Rocklage Scott M |
Director |
2,478,969 |
2022-06-07 |
|
| 3 |
5am Partners V, Llc |
10 Percent Owner |
2,378,969 |
2023-03-09 |
|
| 4 |
5am Opportunities I, L.p. |
10 Percent Owner |
1,251,755 |
2022-06-07 |
|
| 5 |
5am Ventures V, L.p. |
10 Percent Owner |
790,714 |
2021-08-04 |
|
| 6 |
Uden Stephen |
Chief Executive Officer |
453,700 |
2025-02-19 |
|
| 7 |
Fmr Llc |
10 Percent Owner, Other: See Remark 1 |
211,798 |
2026-03-10 |
|
| 8 |
Ryder Steven |
Chief Medical Officer |
180,000 |
2025-02-19 |
|
| 9 |
Fryer Jeffrey M |
See Remarks |
47,048 |
2022-03-23 |
|
| 10 |
Liu Hui |
Director |
28,500 |
2025-05-15 |
|
| 11 |
Hopfner Robert Lorne |
Director |
28,500 |
2025-05-15 |
|
| 12 |
Nash Christine A |
Director |
28,500 |
2025-05-15 |
|
| 13 |
Chung Wendy |
Director |
28,500 |
2025-05-15 |
|
| 14 |
Soteropoulos Paula |
Director |
28,500 |
2025-05-15 |
|
| 15 |
Boudreau Helen M |
Director |
28,500 |
2025-05-15 |
|
| 16 |
Mackay Martin |
Director |
18,055 |
2026-02-20 |
|
| 17 |
Parmar Kush |
Director |
16,500 |
2024-05-17 |
|
| 18 |
Hunt Ronald |
Director |
14,305 |
2026-02-20 |
|
| 19 |
Shannon Timothy M |
Director |
6,041 |
2022-01-05 |
|
| 20 |
Lieber Jonathan I |
Chief Financial Officer |
4,904 |
2026-02-23 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-04 |
Fmr Llc |
10 Percent Owner, Other: See Remark 1 |
Unknown |
- |
- |
- |
| 2026-02-23 |
Lieber Jonathan I |
Chief Financial Officer |
Informative Sell |
789 |
$5.06 |
$3.99K |
| 2026-02-18 |
Lieber Jonathan I |
Chief Financial Officer |
RSU Award |
2,500 |
- |
- |
| 2026-02-18 |
Mackay Martin |
Director |
RSU Award |
18,055 |
$4.45 |
$80.34K |
| 2026-02-18 |
Hunt Ronald |
Director |
RSU Award |
14,305 |
$4.45 |
$63.66K |
| 2025-05-13 |
Chung Wendy |
Director |
RSU Award |
28,500 |
$0.30 |
$8.55K |
| 2025-05-13 |
Liu Hui |
Director |
RSU Award |
28,500 |
$0.30 |
$8.55K |
| 2025-05-13 |
Soteropoulos Paula |
Director |
RSU Award |
28,500 |
$0.30 |
$8.55K |
| 2025-05-13 |
Boudreau Helen M |
Director |
RSU Award |
28,500 |
$0.30 |
$8.55K |
| 2025-05-13 |
Nash Christine A |
Director |
RSU Award |
28,500 |
$0.30 |
$8.55K |
| 2025-05-13 |
Hopfner Robert Lorne |
Director |
RSU Award |
28,500 |
$0.30 |
$8.55K |
| 2025-05-13 |
Mackay Martin |
Director |
RSU Award |
28,500 |
$0.30 |
$8.55K |
| 2025-05-13 |
Hunt Ronald |
Director |
RSU Award |
28,500 |
$0.30 |
$8.55K |
