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Similarweb
SMWB

109 hedge funds and large institutions have $371M invested in Similarweb in 2025 Q1 according to their latest regulatory filings, with 24 funds opening new positions, 33 increasing their positions, 40 reducing their positions, and 26 closing their positions.

New
Increased
Maintained
Reduced
Closed

49% more call options, than puts

Call options by funds: $9.35M | Put options by funds: $6.27M

3.55% more ownership

Funds ownership: 50.62% → 54.17% (+3.6%)

8% less first-time investments, than exits

New positions opened: 24 | Existing positions closed: 26

3% less funds holding

Funds holding: 112 → 109 (-3)

18% less repeat investments, than reductions

Existing positions increased: 33 | Existing positions reduced: 40

29% less funds holding in top 10

Funds holding in top 10: 7 → 5 (-2)

37% less capital invested

Capital invested by funds: $586M → $371M (-$215M)

Holders
109
Holders Change
-3
Holders Change %
-2.68%
% of All Funds
1.46%
Holding in Top 10
5
Holding in Top 10 Change
-2
Holding in Top 10 Change %
-28.57%
% of All Funds
0.07%
New
24
Increased
33
Reduced
40
Closed
26
Calls
$9.35M
Puts
$6.27M
Net Calls
+$3.08M
Net Calls Change
-$10.8M

Top Buyers

1
CCPM
Cooper Creek Partners Management
New York
+$14.7M
2
MIFH
Migdal Insurance & Financial Holdings
Israel
+$12.9M
3
Wellington Management Group
Wellington Management Group
Massachusetts
+$11M
4
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
+$9.07M
5
American Century Companies
American Century Companies
Missouri
+$8.97M

Top Sellers

1
NCGI
Next Century Growth Investors
Minnesota
-$9.91M
2
Acadian Asset Management
Acadian Asset Management
Massachusetts
-$8.67M
3
Walleye Capital
Walleye Capital
New York
-$6.78M
4
SSA
Schonfeld Strategic Advisors
New York
-$5.9M
5
Alyeska Investment Group
Alyeska Investment Group
Illinois
-$5.31M
Name Holding Trade Value Shares
Change 		Change in
Stake
ACM
101
Aquatic Capital Management
Illinois
$5.87K +$8.75K +710 New
Osaic Holdings
102
Osaic Holdings
Arizona
$5.37K -$91.9K -7,459 -92%
TRCT
103
Tower Research Capital (TRC)
New York
$3.37K +$4.6K +373 +1,066%
Wells Fargo
104
Wells Fargo
California
$2.05K -$123 -10 -4%
SS
105
SBI Securities
Japan
$1.65K +$2.46K +200 New
NA
106
NewEdge Advisors
Louisiana
$901 -$19.8K -1,604 -94%
Jones Financial Companies
107
Jones Financial Companies
Missouri
$836 -$505 -41 -29%
Fidelity Investments
108
Fidelity Investments
Massachusetts
$50 – – –
CCM
109
Coldstream Capital Management
Washington
$33 +$49 +4 New
NCGI
110
Next Century Growth Investors
Minnesota
– -$9.91M -699,128 Closed
Walleye Capital
111
Walleye Capital
New York
– -$6.78M -478,417 Closed
Alyeska Investment Group
112
Alyeska Investment Group
Illinois
– -$5.31M -375,000 Closed
Arrowstreet Capital
113
Arrowstreet Capital
Massachusetts
– -$3.62M -255,406 Closed
OWP
114
Old Well Partners
North Carolina
– -$2.22M -156,419 Closed
PC
115
Panoramic Capital
California
– -$1.77M -125,000 Closed
AI
116
Atom Investors
Texas
– -$1.04M -73,655 Closed
ECM
117
ExodusPoint Capital Management
New York
– -$967K -68,218 Closed
SEI Investments
118
SEI Investments
Pennsylvania
– -$966K -68,171 Closed
JF
119
Jump Financial
Illinois
– -$954K -67,300 Closed
XT
120
XTX Topco
Cayman Islands
– -$739K -52,175 Closed
N
121
Numerai
California
– -$548K -38,668 Closed
Squarepoint
122
Squarepoint
New York
– -$548K -38,638 Closed
EGI
123
EAM Global Investors
California
– -$499K -35,219 Closed
GCP
124
GSA Capital Partners
United Kingdom
– -$348K -24,529 Closed
CC
125
Centiva Capital
New York
– -$324K -22,841 Closed
2 3 4
5
6

SMWB Hedge Fund Activity: Q1 2025 in Review

109 of the 7,457 institutional investors tracked by Wall St. Rank reported a position in Similarweb (SMWB) for Q1 2025, worth a combined $371M — down 37% from $586M a quarter earlier.

Sellers outnumbered buyers: 26 funds closed out of SMWB and 24 opened new positions — a net loss of 2 holders — while 40 trimmed existing stakes and 33 added.

The largest buyer was Cooper Creek Partners Management, opening a new position worth an estimated $14.7M. The largest seller was Next Century Growth Investors, exiting entirely with an estimated $9.91M sold.

  • 109 institutional investors held Similarweb (SMWB) as of Q1 2025, down from 112 in Q4 2024.
  • Funds reported $371M of Similarweb stock for Q1 2025, down 37% quarter-over-quarter.
  • 24 funds opened new Similarweb positions in Q1 2025 and 26 closed out, a net change of -2 holders.
  • The largest Similarweb buyer in Q1 2025 was Cooper Creek Partners Management, an estimated $14.7M added.
  • The largest Similarweb seller in Q1 2025 was Next Century Growth Investors, an estimated $9.91M sold.

Based on aggregated 13F filings for Q1 2025.