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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
Viking Global Investors
1
Viking Global Investors
Connecticut
$1.42M – – –
5VM
2
5AM Venture Management
California
$1.23M – – –
JJ
3
Johnson & Johnson
New Jersey
$1.21M – – –
NLVP
4
New Leaf Venture Partners
New York
$1.12M – – –
TGA
5
TPG GP A
Texas
$1.02M – – –
PBPIA
6
Pivotal bioVenture Partners Investment Advisor
California
$813K – – –
Fidelity Investments
7
Fidelity Investments
Massachusetts
$632K +$28.2K +10,633 +5%
AC
8
Almitas Capital
California
$614K +$171K +64,614 +40%
Aberdeen Group
9
Aberdeen Group
United Kingdom
$539K -$43.7K -16,475 -8%
CPX
10
Canaan Partners XI
California
$318K -$196K -73,946 -39%
Vanguard Group
11
Vanguard Group
Pennsylvania
$308K -$20.5K -7,748 -6%
AIIC
12
AJU IB Investment Company
South Korea
$255K – – –
LCM
13
Laurion Capital Management
New York
$249K – – –
Renaissance Technologies
14
Renaissance Technologies
New York
$164K +$29.3K +11,066 +22%
Mariner
15
Mariner
Kansas
$137K – – –
Geode Capital Management
16
Geode Capital Management
Massachusetts
$82.8K -$843 -318 -1%
Millennium Management
17
Millennium Management
New York
$60.8K -$15.7K -5,924 -21%
BlackRock
18
BlackRock
New York
$52.3K -$18.1K -6,846 -26%
UBS Group
19
UBS Group
Switzerland
$40.6K +$34.7K +13,105 +681%
Two Sigma Advisers
20
Two Sigma Advisers
New York
$30K -$702 -265 -2%
Acadian Asset Management
21
Acadian Asset Management
Massachusetts
$29K – – –
Citadel Advisors
22
Citadel Advisors
Florida
$21.9K +$4K +1,510 +23%
Two Sigma Investments
23
Two Sigma Investments
New York
$21.6K -$970 -366 -4%
State Street
24
State Street
Massachusetts
$21K – – –
VF
25
Virtu Financial
New York
$19K +$18.8K +7,095 New
1
2 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.