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Similarweb
SMWB

80 hedge funds and large institutions have $116M invested in Similarweb in 2026 Q1 according to their latest regulatory filings, with 19 funds opening new positions, 32 increasing their positions, 18 reducing their positions, and 35 closing their positions.

New
Increased
Maintained
Reduced
Closed

78% more repeat investments, than reductions

Existing positions increased: 32 | Existing positions reduced: 18

0% more funds holding in top 10

Funds holding in top 10: 4 → 4 (0)

10.04% less ownership

Funds ownership: 58.64% → 48.6% (-10%)

18% less funds holding

Funds holding: 97 → 80 (-17)

46% less first-time investments, than exits

New positions opened: 19 | Existing positions closed: 35

52% less call options, than puts

Call options by funds: $158K | Put options by funds: $327K

69% less capital invested

Capital invested by funds: $372M → $116M (-$256M)

Holders
80
Holders Change
-17
Holders Change %
-17.53%
% of All Funds
0.98%
Holding in Top 10
4
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.05%
New
19
Increased
32
Reduced
18
Closed
35
Calls
$158K
Puts
$327K
Net Calls
-$169K
Net Calls Change
+$4.91M

Top Buyers

1
SST
S Squared Technology
New York
+$3.44M
2
MFS
Mirabella Financial Services
United Kingdom
+$3.31M
3
CF
CDC Financial
Illinois
+$2.07M
4
Millennium Management
Millennium Management
New York
+$1.95M
5
Qube Research & Technologies (QRT)
Qube Research & Technologies (QRT)
United Kingdom
+$1.67M

Top Sellers

1
MIFH
Migdal Insurance & Financial Holdings
Israel
-$23.3M
2
PF
Phoenix Financial
Israel
-$17M
3
N
Nuveen
North Carolina
-$11.4M
4
PCM
Penn Capital Management
Pennsylvania
-$5.12M
5
First Eagle Investment Management
First Eagle Investment Management
New York
-$4.84M
Name Holding Trade Value Shares
Change 		Change in
Stake
FRM
101
Fox Run Management
Connecticut
– -$146K -19,528 Closed
Geode Capital Management
102
Geode Capital Management
Massachusetts
– -$135K -18,036 Closed
Teacher Retirement System of Texas
103
Teacher Retirement System of Texas
Texas
– -$135K -18,016 Closed
PFSRSONJ
104
Police & Firemen's Retirement System of New Jersey
New Jersey
– -$121K -16,124 Closed
Two Sigma Advisers
105
Two Sigma Advisers
New York
– -$97.4K -13,000 Closed
BFM
106
Boothbay Fund Management
New York
– -$89.6K -11,961 Closed
BIG
107
Brooklyn Investment Group
New York
– -$85.2K -11,732 Closed
QT
108
Quantbot Technologies
New York
– -$85K -11,347 Closed
KK
109
KLP Kapitalforvaltning
Norway
– -$60.7K -8,100 Closed
Deutsche Bank
110
Deutsche Bank
Germany
– -$42.4K -5,667 Closed
QL
111
Quarry LP
New York
– -$18K -2,409 Closed
Walleye Trading
112
Walleye Trading
New York
– -$6.52K -871 Closed
CA
113
Crewe Advisors
Utah
– -$5.5K -734 Closed
SOW
114
State of Wyoming
Wyoming
– -$4.08K -544 Closed
NA
115
NewEdge Advisors
Louisiana
– -$816 -109 Closed
1 2 3 4
5

SMWB Hedge Fund Activity: Q1 2026 in Review

80 of the 8,125 institutional investors tracked by Wall St. Rank reported a position in Similarweb (SMWB) for Q1 2026, worth a combined $116M — down 69% from $372M a quarter earlier.

Sellers outnumbered buyers: 35 funds closed out of SMWB and 19 opened new positions — a net loss of 16 holders — while 18 trimmed existing stakes and 32 added.

The largest buyer was S Squared Technology, adding an estimated $3.44M. The largest seller was Migdal Insurance & Financial Holdings, exiting entirely with an estimated $23.3M sold.

  • 80 institutional investors held Similarweb (SMWB) as of Q1 2026, down from 97 in Q4 2025.
  • Funds reported $116M of Similarweb stock for Q1 2026, down 69% quarter-over-quarter.
  • 19 funds opened new Similarweb positions in Q1 2026 and 35 closed out, a net change of -16 holders.
  • The largest Similarweb buyer in Q1 2026 was S Squared Technology, an estimated $3.44M added.
  • The largest Similarweb seller in Q1 2026 was Migdal Insurance & Financial Holdings, an estimated $23.3M sold.

Based on aggregated 13F filings for Q1 2026.