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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.

New
Increased
Maintained
Reduced
Closed

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

Holders
47
Holders Change
-2
Holders Change %
-4.08%
% of All Funds
0.63%
Holding in Top 10
4
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
2
Increased
9
Reduced
15
Closed
4
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
Citadel Advisors
Citadel Advisors
Florida
+$41.7K
2
Vanguard Group
Vanguard Group
Pennsylvania
+$36.7K
3
Fidelity Investments
Fidelity Investments
Massachusetts
+$14.6K
4
Squarepoint
Squarepoint
New York
+$12.7K
5
Jane Street
Jane Street
New York
+$8.39K

Top Sellers

Rank Fund Capital Flow
1
CPX
Canaan Partners XI
California
-$130K
2
NFC
Northeast Financial Consultants
Connecticut
-$92.6K
3
Millennium Management
Millennium Management
New York
-$88.2K
4
AI
Allostery Investments
Connecticut
-$40.4K
5
Renaissance Technologies
Renaissance Technologies
New York
-$35.4K
Name Holding Trade Value Shares
Change 		Change in
Stake
Wells Fargo
26
Wells Fargo
California
$27.6K +$1.5K +237 +5%
Northern Trust
27
Northern Trust
Illinois
$25K -$28K -4,434 -48%
Morgan Stanley
28
Morgan Stanley
New York
$23.9K – – –
Squarepoint
29
Squarepoint
New York
$21.8K +$12.7K +2,016 +94%
Barclays
30
Barclays
United Kingdom
$10.1K – – –
UBS Group
31
UBS Group
Switzerland
$10.1K +$5.56K +880 +84%
GVAG
32
Great Valley Advisor Group
Delaware
$9.82K – – –
ACM
33
ADAR1 Capital Management
Texas
$8.77K – – –
URS
34
Utah Retirement Systems
Utah
$8.67K – – –
HSBC Holdings
35
HSBC Holdings
United Kingdom
$7.89K -$1.6K -253 -14%
Jane Street
36
Jane Street
New York
$6.95K +$8.39K +1,328 New
PAS
37
Point72 Asia (Singapore)
Singapore
$6.55K -$9.99K -1,581 -56%
CAPTRUST Financial Advisors
38
CAPTRUST Financial Advisors
North Carolina
$6.54K – – –
Mercer Global Advisors
39
Mercer Global Advisors
Colorado
$6.54K – – –
Bank of America
40
Bank of America
North Carolina
$5.72K +$6 +1 +0.1%
HFM
41
Hartford Financial Management
Connecticut
$4.25K – – –
TRCT
42
Tower Research Capital (TRC)
New York
$3.4K +$1.23K +195 +43%
SS
43
SBI Securities
Japan
$2.94K -$689 -109 -16%
Federated Hermes
44
Federated Hermes
Pennsylvania
$1.45K -$2.99K -473 -63%
BNP Paribas Financial Markets
45
BNP Paribas Financial Markets
France
$643 -$95 -15 -11%
PD
46
Point72 (DIFC)
United Arab Emirates
$638 -$3.91K -619 -84%
JP Morgan Chase
47
JP Morgan Chase
New York
$618 -$6 -1 -0.8%
NFC
48
Northeast Financial Consultants
Connecticut
– -$92.6K -12,053 Closed
EGM
49
Engineers Gate Manager
New York
– -$34.3K -4,467 Closed
XT
50
XTX Topco
Cayman Islands
– -$14.2K -1,852 Closed
1
2
3

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.