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Rallybio
RLYB

48 hedge funds and large institutions have $10.5M invested in Rallybio in 2025 Q2 according to their latest regulatory filings, with 7 funds opening new positions, 8 increasing their positions, 12 reducing their positions, and 6 closing their positions.

New
Increased
Maintained
Reduced
Closed

17% more first-time investments, than exits

New positions opened: 7 | Existing positions closed: 6

2% more funds holding

Funds holding: 47 → 48 (+1)

0% more funds holding in top 10

Funds holding in top 10: 4 → 4 (0)

0.24% less ownership

Funds ownership: 9.61% → 9.37% (-0.24%)

33% less repeat investments, than reductions

Existing positions increased: 8 | Existing positions reduced: 12

50% less capital invested

Capital invested by funds: $20.9M → $10.5M (-$10.4M)

Holders
48
Holders Change
+1
Holders Change %
+2.13%
% 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
7
Increased
8
Reduced
12
Closed
6
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
AC
Almitas Capital
California
+$171K
2
UBS Group
UBS Group
Switzerland
+$34.7K
3
Renaissance Technologies
Renaissance Technologies
New York
+$29.3K
4
Fidelity Investments
Fidelity Investments
Massachusetts
+$28.2K
5
VF
Virtu Financial
New York
+$18.8K

Top Sellers

Rank Fund Capital Flow
1
AI
Allostery Investments
Connecticut
-$492K
2
CPX
Canaan Partners XI
California
-$196K
3
BCM
Bridgeway Capital Management
Texas
-$60K
4
Aberdeen Group
Aberdeen Group
United Kingdom
-$43.7K
5
Squarepoint
Squarepoint
New York
-$21.8K
Name Holding Trade Value Shares
Change 		Change in
Stake
XT
26
XTX Topco
Cayman Islands
$18.8K +$18.4K +6,935 New
Wells Fargo
27
Wells Fargo
California
$13.5K -$718 -271 -5%
Northern Trust
28
Northern Trust
Illinois
$12.9K – – –
Morgan Stanley
29
Morgan Stanley
New York
$12.3K – – –
HF
30
HRT Financial
New York
$10K +$9.81K +3,701 New
Susquehanna International Group
31
Susquehanna International Group
Pennsylvania
$7.86K +$7.71K +2,908 New
Barclays
32
Barclays
United Kingdom
$5.2K – – –
TSS
33
Two Sigma Securities
New York
$5.12K +$5.02K +1,894 New
GVAG
34
Great Valley Advisor Group
Delaware
$5.07K – – –
URS
35
Utah Retirement Systems
Utah
$4.47K – – –
Jane Street
36
Jane Street
New York
$3.97K +$371 +140 +11%
HSBC Holdings
37
HSBC Holdings
United Kingdom
$3.5K -$509 -192 -13%
CAPTRUST Financial Advisors
38
CAPTRUST Financial Advisors
North Carolina
$3.38K – – –
Mercer Global Advisors
39
Mercer Global Advisors
Colorado
$3.38K – – –
Bank of America
40
Bank of America
North Carolina
$2.96K +$11 +4 +0.4%
TRCT
41
Tower Research Capital (TRC)
New York
$2.48K +$713 +269 +41%
HFM
42
Hartford Financial Management
Connecticut
$2.2K – – –
SS
43
SBI Securities
Japan
$1.5K -$13 -5 -0.9%
Federated Hermes
44
Federated Hermes
Pennsylvania
$747 – – –
BNP Paribas Financial Markets
45
BNP Paribas Financial Markets
France
$332 – – –
JP Morgan Chase
46
JP Morgan Chase
New York
$298 -$21 -8 -7%
Raymond James Financial
47
Raymond James Financial
Florida
$288 +$281 +106 New
AF
48
Allworth Financial
California
$17 +$16 +6 New
AI
49
Allostery Investments
Connecticut
– -$492K -94,029 Closed
BCM
50
Bridgeway Capital Management
Texas
– -$60K -11,450 Closed
1
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3

RLYB Hedge Fund Activity: Q2 2025 in Review

48 of the 7,598 institutional investors tracked by Wall St. Rank reported a position in Rallybio (RLYB) for Q2 2025, worth a combined $10.5M — down 50% from $20.9M a quarter earlier.

Buyers outnumbered sellers: 7 funds opened new RLYB positions and 6 closed out — a net gain of 1 holder — while 8 added to existing stakes and 12 trimmed.

The largest buyer was Almitas Capital, adding an estimated $171K. The largest seller was Allostery Investments, exiting entirely with an estimated $492K sold.

  • 48 institutional investors held Rallybio (RLYB) as of Q2 2025, up from 47 in Q1 2025.
  • Funds reported $10.5M of Rallybio stock for Q2 2025, down 50% quarter-over-quarter.
  • 7 funds opened new Rallybio positions in Q2 2025 and 6 closed out, a net change of +1 holder.
  • The largest Rallybio buyer in Q2 2025 was Almitas Capital, an estimated $171K added.
  • The largest Rallybio seller in Q2 2025 was Allostery Investments, an estimated $492K sold.

Based on aggregated 13F filings for Q2 2025.