Similarweb
SMWB
94 hedge funds and large institutions have $426M invested in Similarweb in 2025 Q3 according to their latest regulatory filings, with 11 funds opening new positions, 31 increasing their positions, 34 reducing their positions, and 27 closing their positions.
29% more capital invested
Capital invested by funds: $330M → $426M (+$95.6M)
4.21% more ownership
Funds ownership: 49.67% → 53.88% (+4.2%)
0% more funds holding in top 10
Funds holding in top 10: 4 → 4 (0)
9% less repeat investments, than reductions
Existing positions increased: 31 | Existing positions reduced: 34
15% less funds holding
Funds holding: 110 → 94 (-16)
59% less first-time investments, than exits
New positions opened: 11 | Existing positions closed: 27
90% less call options, than puts
Call options by funds: $2.19M | Put options by funds: $21.1M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
+$13.7M |
| 2 |
PF
Phoenix Financial
Givatayim,
Israel
|
+$12.2M |
| 3 |
PCM
Penn Capital Management
Philadelphia,
Pennsylvania
|
+$11M |
| 4 |
MMH
Menora Mivtachim Holdings
Ramat Gan,
Israel
|
+$7.89M |
| 5 |
New York State Common Retirement Fund
Albany,
New York
|
+$7.61M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
SGM
Scalar Gauge Management
Dallas,
Texas
|
-$6.04M |
| 2 |
Citadel Advisors
Miami,
Florida
|
-$5.55M |
| 3 |
Morgan Stanley
New York
|
-$5.49M |
| 4 |
CSS
Cubist Systematic Strategies
Stamford,
Connecticut
|
-$3.27M |
| 5 |
CP
CenterBook Partners
Greenwich,
Connecticut
|
-$2.34M |
SMWB Hedge Fund Activity: Q3 2025 in Review
94 of the 7,621 institutional investors tracked by Wall St. Rank reported a position in Similarweb (SMWB) for Q3 2025, worth a combined $426M — up 29% from $330M a quarter earlier.
Sellers outnumbered buyers: 27 funds closed out of SMWB and 11 opened new positions — a net loss of 16 holders — while 34 trimmed existing stakes and 31 added.
The largest buyer was Wellington Management Group, adding an estimated $13.7M. The largest seller was Scalar Gauge Management, cutting an estimated $6.04M.
- 94 institutional investors held Similarweb (SMWB) as of Q3 2025, down from 110 in Q2 2025.
- Funds reported $426M of Similarweb stock for Q3 2025, up 29% quarter-over-quarter.
- 11 funds opened new Similarweb positions in Q3 2025 and 27 closed out, a net change of -16 holders.
- The largest Similarweb buyer in Q3 2025 was Wellington Management Group, an estimated $13.7M added.
- The largest Similarweb seller in Q3 2025 was Scalar Gauge Management, an estimated $6.04M sold.
Based on aggregated 13F filings for Q3 2025.