STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
34
13F, latest reported quarter
Conversions, 180 days
8
Codes C/M, not in net · $2.0M priced
What the filings say about SMWB
Insiders, 180 days
-$14.1M net sold
4 buyers · 1 seller · 58% of sales under a 10b5-1 plan
Planned sales (Form 144), 90 days
$18.5M
5 notices
Similarweb insider trades (Form 4)
Form 4 buys and sells (codes P and S). Grants, option exercises
and conversions excluded.
Over the last 180 days, SIMILARWEB LTD. insiders sold a net $14.1M of stock across 31 Form 4 purchases and sales, with 4 insiders buying. Source: SEC Form 4 filings, as of 2026-10-28.
Foreign private issuer: most of its insiders are exempt from SEC Form 4, but some still file it; those filings are listed below, and the record may be incomplete.
26 earlier Form 4 trades (code P or S) here by this insider (4 buys, 22 sales), the last on Sep 23, 2026.
+132.6% median (+132.2% mean) 90-day return after 3 previous buys.
The trade is 2.9% of the 3,930,881 shares held after it.
No other insider sold within 30 days.
34 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Executive Officer Offer Or sold about $875.8K of SMWB under a 10b5-1 plan on Sep 24, 2026; 34 funds added in the latest 13F quarter.
26 earlier Form 4 trades (code P or S) here by this insider (4 buys, 22 sales), the last on Sep 23, 2026.
+132.6% median (+132.2% mean) 90-day return after 3 previous buys.
The trade is 0.0% of the 3,930,481 shares held after it.
No other insider sold within 30 days.
34 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Executive Officer Offer Or sold about $3.3K of SMWB under a 10b5-1 plan on Sep 24, 2026; 34 funds added in the latest 13F quarter.
25 earlier Form 4 trades (code P or S) here by this insider (4 buys, 21 sales), the last on Sep 22, 2026.
+132.6% median (+132.2% mean) 90-day return after 3 previous buys.
The trade is 0.7% of the 4,044,781 shares held after it.
No other insider sold within 30 days.
34 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Executive Officer Offer Or sold about $242.4K of SMWB under a 10b5-1 plan on Sep 23, 2026; 34 funds added in the latest 13F quarter.
24 earlier Form 4 trades (code P or S) here by this insider (4 buys, 20 sales), the last on Sep 21, 2026.
+132.6% median (+132.2% mean) 90-day return after 3 previous buys.
The trade is 0.8% of the 4,073,181 shares held after it.
No other insider sold within 30 days.
34 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Executive Officer Offer Or sold about $289.0K of SMWB under a 10b5-1 plan on Sep 22, 2026; 34 funds added in the latest 13F quarter.
23 earlier Form 4 trades (code P or S) here by this insider (4 buys, 19 sales), the last on Sep 18, 2026.
+132.6% median (+132.2% mean) 90-day return after 3 previous buys.
The trade is 0.8% of the 4,107,681 shares held after it.
No other insider sold within 30 days.
34 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Executive Officer Offer Or sold about $270.6K of SMWB under a 10b5-1 plan on Sep 21, 2026; 34 funds added in the latest 13F quarter.
31 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
Nobody has filed for crossing 5%. That is a fact, not missing data.
SMWB planned insider sales (Form 144)
Notice of intent to sell, filed before any sale
Or Offer
Filed 2026-09-08
$8.8M
Or Offer
Filed 2026-08-27
$3.4M
Or Offer
Filed 2026-08-17
$351.6K
Or Offer
Filed 2026-08-17
$1.2M
Or Offer
Filed 2026-08-14
$4.7M
SMWB mutual fund holders (N-PORT)
Funds ranked by the share of their own portfolio in this stock (N-PORT).
TIFF MULTI-ASSET FUND
$426.0K position · as of 2026-06-30
0.0%
Avantis International Equity Fund
$9.0K position · as of 2026-05-31
0.0%
Avantis International Small Cap Equity ETF
$419 position · as of 2026-05-31
0.0%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M ·
% is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
4 insiders reported buying shares.
The record shows a net $14.1M sold by insiders over 180 days, 34 funds added last quarter, $18.5M in planned Form 144 sales. Each figure is a federal filing, dated the day it went public.
SMWB ranks highest on risk and compliance (71st percentile) and growth (61st), and lowest on institutional and government (31st), among Software & IT peers.
Growth
61
Inputs
Revenue growth, YoY+13.1% · 57 pct, sector of 480
Backlog growth, YoY+17.4% · 66 pct, sector of 182
Insider conviction
60
Inputs
Net Form 4 buying (codes P and S), 180d-$8.7M · 26 pct, sector of 285
Insider buyers, 180d4 · 94 pct, sector of 290
Institutional and government
31
Inputs
Funds adding, latest quarter34 · 31 pct, sector of 415
Congress net buyers, 365dno Congress trades in 365 days
Federal contracts, 180dno federal contracts in 180 days
Lobbying spend, 4 quartersno lobbying filings in the last four quarters
Risk and compliance
71
Inputs
Short interest, % of float+1.7% · 71 pct, sector of 530
Recalls per $1B revenue, 3ynot measured for this sector, almost no peer has an event
EPA cases per $1B revenue, 5ynot measured for this sector, almost no peer has an event
New text in Risk Factors, latest 10-Kneeds two 10-Ks with a Risk Factors section (not 20-F filers or stubs)
3 not measured: Profitability, Financial health, US patents
Profitability needs 2 of 4 inputs, 0 present: fewer than four consecutive quarters of net income; fewer than four consecutive quarters of operating income
Financial health needs 1 of 2 inputs, 0 present: no debt line filed
US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet
4 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored
SMWB filings, in plain words
Are Similarweb insiders buying or selling SMWB?
In the 180 days to 2026-10-28, Similarweb insiders were net sellers, a net $14.1M: $1.0M of purchases and $15.2M of sales reported on Form 4, by 4 buyers and 1 seller.
Are there planned insider sales of SMWB?
Yes. 5 Form 144 notices of planned insider sales were filed in the 90 days to 2026-10-28, covering $18.5M of stock; the latest, by Or Offer, was filed 2026-09-08.
Read the full summary
In the 180 days to 2026-10-28, Similarweb insiders were net sellers of SMWB, a net $14.1M across purchases and sales reported on Form 4 by 4 buyers and 1 seller. Sales outweighed purchases more than tenfold by value. 4 insiders reported purchases in that window. 58% of the 24 insider sales were made under a Rule 10b5-1 plan; the rest were not flagged as planned. Insiders filed 5 Form 144 notices of intent to sell in the 90 days to 2026-10-28, covering $18.5M of stock. Each figure is counted from SEC and House filings as of 2026-10-28, dated the day the filing was made public.
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