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.
78% more repeat investments, than reductions
Existing positions increased: 32 | Existing positions reduced: 18
10.04% less ownership
Funds ownership: 58.64% → 48.6% (-10%)
18% less funds holding
Funds holding: 97 → 80 (-17)
25% less funds holding in top 10
Funds holding in top 10: 4 → 3 (-1)
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)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
SST
S Squared Technology
New York
|
+$3.44M |
| 2 |
MFS
Mirabella Financial Services
London,
United Kingdom
|
+$3.31M |
| 3 |
CF
CDC Financial
Chicago,
Illinois
|
+$2.07M |
| 4 |
Millennium Management
New York
|
+$1.95M |
| 5 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
+$1.67M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
MIFH
Migdal Insurance & Financial Holdings
Petach Tikva,
Israel
|
-$23.3M |
| 2 |
PF
Phoenix Financial
Givatayim,
Israel
|
-$17M |
| 3 |
Nuveen
Charlotte,
North Carolina
|
-$11.4M |
| 4 |
PCM
Penn Capital Management
Philadelphia,
Pennsylvania
|
-$5.12M |
| 5 |
First Eagle Investment Management
New York
|
-$4.84M |
SMWB Hedge Fund Activity: Q1 2026 in Review
80 of the 8,198 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.