What is CoStar's backlog?

CoStar reported $600M of remaining performance obligations at 30 Sep 2026, up 12% from a year earlier and up 0% from the previous quarter. That is 0.2 years of trailing revenue already under contract. Book-to-bill last quarter: 1.00.

CoStar (CSGP) backlog: remaining performance obligations

How much revenue CoStar already has under contract, how fast it converts, and who it is with.

Data as of 7 Nov 2026.

Open the interactive Backlog view CoStar competitor analysis

CoStar reported $600M of remaining performance obligations at 30 Sep 2026, up 12% from a year earlier and up 0% from the previous quarter. That is 0.2 years of trailing revenue already under contract. Book-to-bill last quarter: 1.00.
Net new backlog added in the latest quarter: $1.00M.
Customer prepayments (contract liabilities) cover 41.8% of the backlog.
Twelve-month book-to-bill: 1.02, i.e. 1.02 of new orders for every 1 of revenue recognised.
Backlog growth minus revenue growth: -9 points — revenue is catching up with orders.
By backlog size it ranks 293rd among US filers the cockpit tracks.

CoStar 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
30 Sep 2026	$600M	$3.67B	0.2 yrs	$251M
30 Jun 2026	$599M	$3.56B	0.2 yrs	$234M
31 Mar 2026	$519M	$3.41B	0.2 yrs	$238M
31 Dec 2025	$527M	$3.25B	0.2 yrs	$206M
30 Sep 2025	$537M	$3.06B	0.2 yrs	$203M
30 Jun 2025	$476M	$2.91B	0.2 yrs	$189M
31 Mar 2025	$455M	$2.81B	0.2 yrs	$183M
31 Dec 2024	$392M	$2.74B	0.1 yrs	$137M
30 Sep 2024	$404M	$2.67B	0.2 yrs	$114M
30 Jun 2024	$410M	$2.60B	0.2 yrs	$123M
31 Mar 2024	$394M	$2.53B	0.2 yrs	$117M
31 Dec 2023	$410M	$2.46B	0.2 yrs	$104M

Questions

What is CoStar's backlog?: CoStar reported $600M of remaining performance obligations at 30 Sep 2026, up 12% from a year earlier and up 0% from the previous quarter. That is 0.2 years of trailing revenue already under contract. Book-to-bill last quarter: 1.00.

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.