Rallybio
RLYB
47 hedge funds and large institutions have $20.9M invested in Rallybio in 2025 Q1 according to their latest regulatory filings, with 2 funds opening new positions, 9 increasing their positions, 15 reducing their positions, and 4 closing their positions.
0% more funds holding in top 10
Funds holding in top 10: 4 → 4 (0)
0.16% less ownership
Funds ownership: 9.77% → 9.61% (-0.16%)
4% less funds holding
Funds holding: 49 → 47 (-2)
33% less capital invested
Capital invested by funds: $31.1M → $20.9M (-$10.2M)
40% less repeat investments, than reductions
Existing positions increased: 9 | Existing positions reduced: 15
50% less first-time investments, than exits
New positions opened: 2 | Existing positions closed: 4
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
+$41.7K |
| 2 |
Vanguard Group
Malvern,
Pennsylvania
|
+$36.7K |
| 3 |
Fidelity Investments
Boston,
Massachusetts
|
+$14.6K |
| 4 |
Squarepoint
New York
|
+$12.7K |
| 5 |
Jane Street
New York
|
+$8.39K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
CPX
Canaan Partners XI
Menlo Park,
California
|
-$130K |
| 2 |
NFC
Northeast Financial Consultants
Westport,
Connecticut
|
-$92.6K |
| 3 |
Millennium Management
New York
|
-$88.2K |
| 4 |
AI
Allostery Investments
Stamford,
Connecticut
|
-$40.4K |
| 5 |
Renaissance Technologies
New York
|
-$35.4K |
| Name | Holding | Trade Value |
Shares Change |
Change in Stake |
|
|---|---|---|---|---|---|
51
Citigroup
New York
| – | -$2.35K | -306 | Closed |
|
RLYB Hedge Fund Activity: Q1 2025 in Review
47 of the 7,457 institutional investors tracked by Wall St. Rank reported a position in Rallybio (RLYB) for Q1 2025, worth a combined $20.9M — down 33% from $31.1M a quarter earlier.
Sellers outnumbered buyers: 4 funds closed out of RLYB and 2 opened new positions — a net loss of 2 holders — while 15 trimmed existing stakes and 9 added.
The largest buyer was Citadel Advisors, opening a new position worth an estimated $41.7K. The largest seller was Canaan Partners XI, cutting an estimated $130K.
- 47 institutional investors held Rallybio (RLYB) as of Q1 2025, down from 49 in Q4 2024.
- Funds reported $20.9M of Rallybio stock for Q1 2025, down 33% quarter-over-quarter.
- 2 funds opened new Rallybio positions in Q1 2025 and 4 closed out, a net change of -2 holders.
- The largest Rallybio buyer in Q1 2025 was Citadel Advisors, an estimated $41.7K added.
- The largest Rallybio seller in Q1 2025 was Canaan Partners XI, an estimated $130K sold.
Based on aggregated 13F filings for Q1 2025.