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Rallybio
RLYB

45 hedge funds and large institutions have $14.1M invested in Rallybio in 2025 Q3 according to their latest regulatory filings, with 6 funds opening new positions, 7 increasing their positions, 12 reducing their positions, and 9 closing their positions.

New
Increased
Maintained
Reduced
Closed

34% more capital invested

Capital invested by funds: $10.5M → $14.1M (+$3.6M)

25% more funds holding in top 10

Funds holding in top 10: 4 → 5 (+1)

0.91% less ownership

Funds ownership: 9.37% → 8.46% (-0.91%)

6% less funds holding

Funds holding: 48 → 45 (-3)

33% less first-time investments, than exits

New positions opened: 6 | Existing positions closed: 9

42% less repeat investments, than reductions

Existing positions increased: 7 | Existing positions reduced: 12

Holders
45
Holders Change
-3
Holders Change %
-6.25%
% of All Funds
0.59%
Holding in Top 10
5
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+25%
% of All Funds
0.07%
New
6
Increased
7
Reduced
12
Closed
9
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
Citadel Advisors
Citadel Advisors
Florida
+$196K
2
Renaissance Technologies
Renaissance Technologies
New York
+$121K
3
Susquehanna International Group
Susquehanna International Group
Pennsylvania
+$59.4K
4
Vanguard Group
Vanguard Group
Pennsylvania
+$47.1K
5
RC
Rangeley Capital
Connecticut
+$43.6K

Top Sellers

Rank Fund Capital Flow
1
Aberdeen Group
Aberdeen Group
United Kingdom
-$539K
2
CPX
Canaan Partners XI
California
-$258K
3
LCM
Laurion Capital Management
New York
-$249K
4
AC
Almitas Capital
California
-$146K
5
Fidelity Investments
Fidelity Investments
Massachusetts
-$92.4K
Name Holding Trade Value Shares
Change 		Change in
Stake
Two Sigma Investments
26
Two Sigma Investments
New York
$10.7K -$22.2K -5,291 -66%
OIA
27
OneDigital Investment Advisors
Kansas
$9.98K +$10.5K +2,500 New
GVAG
28
Great Valley Advisor Group
Delaware
$7.49K – – –
URS
29
Utah Retirement Systems
Utah
$6.61K – – –
TRCT
30
Tower Research Capital (TRC)
New York
$5.08K +$1.49K +355 +39%
CAPTRUST Financial Advisors
31
CAPTRUST Financial Advisors
North Carolina
$4.99K – – –
Mercer Global Advisors
32
Mercer Global Advisors
Colorado
$4.99K – – –
Citigroup
33
Citigroup
New York
$4.94K +$5.2K +1,237 New
HFM
34
Hartford Financial Management
Connecticut
$3.24K – – –
Barclays
35
Barclays
United Kingdom
$2.85K -$5.08K -1,209 -63%
Morgan Stanley
36
Morgan Stanley
New York
$2.31K -$16.7K -3,981 -87%
SS
37
SBI Securities
Japan
$2.12K -$105 -25 -4%
UBS Group
38
UBS Group
Switzerland
$1.18K -$61.9K -14,734 -98%
BNP Paribas Financial Markets
39
BNP Paribas Financial Markets
France
$489 – – –
JP Morgan Chase
40
JP Morgan Chase
New York
$440 – – –
Rockefeller Capital Management
41
Rockefeller Capital Management
New York
$274 +$290 +69 New
Wells Fargo
42
Wells Fargo
California
$150 -$20.9K -4,966 -99%
Bank of America
43
Bank of America
North Carolina
$107 -$4.5K -1,070 -98%
Jones Financial Companies
44
Jones Financial Companies
Missouri
$50 +$46 +11 New
AF
45
Allworth Financial
California
$25 – – –
Aberdeen Group
46
Aberdeen Group
United Kingdom
– -$539K -199,408 Closed
LCM
47
Laurion Capital Management
New York
– -$249K -91,943 Closed
Millennium Management
48
Millennium Management
New York
– -$60.8K -22,480 Closed
Two Sigma Advisers
49
Two Sigma Advisers
New York
– -$30K -11,113 Closed
TSS
50
Two Sigma Securities
New York
– -$5.12K -1,894 Closed
1
2
3

RLYB Hedge Fund Activity: Q3 2025 in Review

45 of the 7,625 institutional investors tracked by Wall St. Rank reported a position in Rallybio (RLYB) for Q3 2025, worth a combined $14.1M — up 34% from $10.5M a quarter earlier.

Sellers outnumbered buyers: 9 funds closed out of RLYB and 6 opened new positions — a net loss of 3 holders — while 12 trimmed existing stakes and 7 added.

The largest buyer was Citadel Advisors, adding an estimated $196K. The largest seller was Aberdeen Group, exiting entirely with an estimated $539K sold.

  • 45 institutional investors held Rallybio (RLYB) as of Q3 2025, down from 48 in Q2 2025.
  • Funds reported $14.1M of Rallybio stock for Q3 2025, up 34% quarter-over-quarter.
  • 6 funds opened new Rallybio positions in Q3 2025 and 9 closed out, a net change of -3 holders.
  • The largest Rallybio buyer in Q3 2025 was Citadel Advisors, an estimated $196K added.
  • The largest Rallybio seller in Q3 2025 was Aberdeen Group, an estimated $539K sold.

Based on aggregated 13F filings for Q3 2025.