Similarweb reported $289M of remaining performance obligations at 31 Dec 2025, up 17% from a year earlier. That is 1.0 years of trailing revenue already under contract.
Over the last twelve months it turned about 115% of its opening backlog into revenue (12-month conversion).
69% of the backlog is due within the next twelve months.
Customer prepayments (contract liabilities) cover 38.9% of the backlog.
Twelve-month book-to-bill: 1.15, i.e. 1.15 of new orders for every 1 of revenue recognised.
Backlog growth minus revenue growth: +4 points — orders are running ahead of revenue.
The latest filed figure is more than 200 days old.
Similarweb backlog history
Remaining performance obligations at each quarter end (bars) against trailing twelve-month revenue (line).
Amounts in USD. Source: SEC XBRL filings.
Quarter end
Backlog (RPO)
TTM revenue
Coverage
Customer prepayments
31 Dec 2025
$289M
$283M
1.0 yrs
$112M
31 Dec 2024
$246M
$250M
1.0 yrs
$108M
31 Dec 2023
$195M
$218M
0.9 yrs
$100M
31 Dec 2022
$171M
$193M
0.9 yrs
$93.2M
31 Dec 2021
$138M
$138M
1.0 yrs
$76.7M
Questions
What is Similarweb's backlog?
Similarweb reported $289M of remaining performance obligations at 31 Dec 2025, up 17% from a year earlier. That is 1.0 years of trailing revenue already under contract.
How fast does Similarweb's backlog turn into revenue?
Over the last twelve months Similarweb recognised revenue equal to about 115% of the backlog it started each quarter with.
About these numbers
Remaining performance obligations (RPO) are revenue a company has contracted but not yet recognised, as reported in its SEC filings (XBRL tag RevenueRemainingPerformanceObligation). Coverage = backlog ÷ trailing twelve-month revenue. Book-to-bill = (change in backlog + revenue) ÷ revenue. Conversion = revenue recognised ÷ the backlog at the start of each quarter, summed over four quarters. Counterparty values come from company filings and releases.