TickerFacts.

CoStar Group, Inc. (CSGP): Shares Outstanding

Annual figures by period end, from SEC filings.

Stock splits: 10-for-1, first reflected in a filing dated 2021-07-28. Figures are as filed: per-share figures and share counts last reported before a split are on the old share basis, so changes and growth rates across a split are not shown. Splits are read from the filings' own restatements, so a share conversion in a merger or reorganization shows up the same way.

Restated years: each year's figure is from the latest filing that reports it. The company later restated the year ended 2017-12-31 (for example after a spin-off or a discontinued operation), while the year before it was last reported on the old basis. Changes across those points are marked n/c (not comparable), and growth rates are not computed across them.

417.90M
As of 2025-12-31
+0.9%
3-year compound annual growth
+1.2%
5-year compound annual growth
2010-12-31: 20.77M2011-12-31: 25.43M2012-12-31: 28.35M2013-12-31: 28.85M2014-12-31: 32.32M2015-12-31: 32.51M2016-12-31: 32.51M2017-12-31: 36.11M2018-12-31: 36.45M2019-12-31: 36.67M2020-12-31: 394.29M2021-12-31: 394.94M2022-12-31: 406.70M2023-12-31: 408.10M2024-12-31: 409.50M2025-12-31: 417.90M417.90M
2010-12-31 Shares Outstanding (shares) 2025-12-31

Paler bars were last filed before a stock split, on the old share basis.

Period endedShares OutstandingChange YoYSource filing
2025-12-31417.90M+2.1%2026-02-26, Balance as of period end
2024-12-31409.50M+0.3%2026-02-26, Balance as of period end
2023-12-31408.10M+0.3%2025-02-20, Balance as of period end
2022-12-31406.70M+3.0%2024-02-22, Balance as of period end
2021-12-31394.94M+0.2%2023-02-22, Balance as of period end
2020-12-31394.29Mn/c2022-02-23, Balance as of period end
2019-12-3136.67M+0.6%2021-02-24, Balance as of period end
2018-12-3136.45M+0.9%2020-02-26, Balance as of period end
2017-12-3136.11Mn/c2019-02-28, Balance as of period end
2016-12-3132.51M0.0%2018-02-23, Balance as of period end
2015-12-3132.51M+0.6%2017-02-24, Balance as of period end
2014-12-3132.32M+12.0%2016-02-26, Balance as of period end
2013-12-3128.85M+1.8%2015-02-26, Balance as of period end
2012-12-3128.35M+11.5%2014-02-20, Balance as of period end
2011-12-3125.43M+22.4%2013-03-01, Balance as of period end
2010-12-3120.77Mn/a2012-02-23, Balance as of period end