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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
Swiss National Bank
51
Swiss National Bank
Switzerland
$659K -$16K -1,300 -2%
LCM
52
Legato Capital Management
California
$645K -$14.8K -1,198 -2%
BNP Paribas Financial Markets
53
BNP Paribas Financial Markets
France
$610K -$181K -14,690 -17%
UBS Group
54
UBS Group
Switzerland
$540K -$1.84M -149,642 -70%
HRCM
55
Hood River Capital Management
Florida
$538K +$801K +65,000 New
B
56
Bailard
California
$507K +$195K +15,799 +35%
Point72 Asset Management
57
Point72 Asset Management
Connecticut
$492K -$432K -35,011 -37%
UBS AM
58
UBS AM
Illinois
$414K +$421K +34,180 +215%
PWAM
59
Papamarkou Wellner Asset Management
New York
$406K +$605K +49,092 New
QT
60
Quantbot Technologies
New York
$385K +$209K +16,948 +57%
PEAK6
61
PEAK6
Illinois
$374K +$557K +45,178 New
Simplex Trading
62
Simplex Trading
Illinois
$333K +$497K +40,314 New
Cetera Investment Advisers
63
Cetera Investment Advisers
Illinois
$332K +$495K +40,161 New
California State Teachers Retirement System (CalSTRS)
64
California State Teachers Retirement System (CalSTRS)
California
$317K – – –
Legal & General Group
65
Legal & General Group
United Kingdom
$315K -$15.2K -1,232 -3%
TI
66
Tidal Investments
Wisconsin
$306K -$44.8K -3,635 -9%
Two Sigma Advisers
67
Two Sigma Advisers
New York
$302K -$87.5K -7,100 -16%
Vanguard Group
68
Vanguard Group
Pennsylvania
$292K – – –
CAM
69
Cresset Asset Management
Illinois
$288K -$141K -11,461 -25%
Geode Capital Management
70
Geode Capital Management
Massachusetts
$279K – – –
Pathstone Holdings
71
Pathstone Holdings
New Jersey
$273K – – –
Federated Hermes
72
Federated Hermes
Pennsylvania
$261K +$388K +31,500 New
YIH
73
Y-Intercept (HK)
Hong Kong
$258K +$385K +31,219 New
Susquehanna International Group
74
Susquehanna International Group
Pennsylvania
$251K +$374K +30,337 New
Millennium Management
75
Millennium Management
New York
$211K -$1.02M -82,874 -77%
1 2
3
4 5

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.