CSGP shares out (basic) history

Quarterly. Dates are reporting period ends; fiscal years can differ from calendar years.

CoStar Group Shares Out (Basic) — Quarterly
Period ending	Shares Out (Basic)
Jun 30, 2026	404,100,000
Mar 31, 2026	413,000,000
Dec 31, 2025	417,200,000
Sep 30, 2025	419,900,000
Jun 30, 2025	419,600,000
Mar 31, 2025	410,500,000
Dec 31, 2024	406,900,000
Sep 30, 2024	406,800,000
Jun 30, 2024	406,000,000
Mar 31, 2024	405,600,000
Dec 31, 2023	405,800,000
Sep 30, 2023	405,649,000
Jun 30, 2023	405,429,000
Mar 31, 2023	404,490,000
Dec 31, 2022	404,185,000
Sep 30, 2022	394,712,000
Jun 30, 2022	393,342,000
Mar 31, 2022	392,895,000
Dec 31, 2021	392,538,000
Sep 30, 2021	392,419,000
Jun 30, 2021	392,306,000
Mar 31, 2021	391,578,000
Dec 31, 2020	391,370,000
Sep 30, 2020	391,586,000
Jun 30, 2020	375,239,000
Mar 31, 2020	364,710,000
Dec 31, 2019	363,590,000
Sep 30, 2019	363,330,000
Jun 30, 2019	363,100,000
Mar 31, 2019	362,370,000
Dec 31, 2018	361,360,000
Sep 30, 2018	361,290,000
Jun 30, 2018	360,730,000
Mar 31, 2018	358,930,000
Dec 31, 2017	356,750,000
Sep 30, 2017	324,440,000
Jun 30, 2017	324,060,000
Mar 31, 2017	322,760,000
Dec 31, 2016	322,130,000
Sep 30, 2016	321,860,000
Jun 30, 2016	321,860,000
Mar 31, 2016	320,850,000
Dec 31, 2015	319,990,000
Sep 30, 2015	315,411,764
Jun 30, 2015	318,425,531
Mar 31, 2015	318,310,000
Dec 31, 2014	317,610,000
Sep 30, 2014	317,420,000
Jun 30, 2014	290,610,000
Mar 31, 2014	282,730,000
Dec 31, 2013	278,570,000
Sep 30, 2013	277,580,000
Jun 30, 2013	276,360,000
Mar 31, 2013	267,777,777
Dec 31, 2012	272,950,000
Sep 30, 2012	272,430,000
Jun 30, 2012	264,650,000
Mar 31, 2012	251,280,000
Dec 31, 2011	250,090,000
Sep 30, 2011	249,730,000
Jun 30, 2011	220,110,000
Mar 31, 2011	205,310,000
Dec 31, 2010	203,930,000
Sep 30, 2010	203,280,000
Jun 30, 2010	202,780,000
Mar 31, 2010	202,490,000
Dec 31, 2009	202,360,000
Sep 30, 2009	198,680,000
Jun 30, 2009	194,790,000
Mar 31, 2009	194,680,000
Dec 31, 2008	194,680,000
Sep 30, 2008	193,930,000
Jun 30, 2008	193,110,000
Mar 31, 2008	192,170,000
Dec 31, 2007	191,850,000
Sep 30, 2007	190,450,000
Jun 30, 2007	189,520,000
Mar 31, 2007	188,960,000
Dec 31, 2006	188,320,000
Sep 30, 2006	187,870,000
Jun 30, 2006	188,220,000
Mar 31, 2006	186,920,000
Dec 31, 2005	186,420,000
Sep 30, 2005	184,850,000
Jun 30, 2005	183,660,000
Mar 31, 2005	183,180,000
Dec 31, 2004	183,000,000
Sep 30, 2004	182,470,000
Jun 30, 2004	181,510,000
Mar 31, 2004	179,610,000
Dec 31, 2003	171,560,000
Sep 30, 2003	159,810,000
Jun 30, 2003	158,560,000
Mar 31, 2003	158,140,000
Dec 31, 2002	157,950,000
Sep 30, 2002	157,770,000
Jun 30, 2002	157,420,000
Mar 31, 2002	157,200,000
Dec 31, 2001	156,570,000
Sep 30, 2001	156,570,000