COSTAR GROUP INC

Ticker: CSGP CUSIP: 22160N109 Class: EQTY

KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC's Holding History (CIK: 0001021223)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 635,720 Value ($000) $42,746 Avg Close $70.84 Range $62.00 - $85.24

Q3 2025

Shares 741,641 Value ($000) $62,572 Avg Close $88.37 Range $79.94 - $97.43

Q2 2025

Shares 782,686 Value ($000) $62,928 Avg Close $77.90 Range $71.21 - $83.68

Q1 2025

Shares 832,539 Value ($000) $65,962 Avg Close $76.08 Range $68.41 - $83.03

Q4 2024

Shares 907,848 Value ($000) $64,993 Avg Close $75.52 Range $68.26 - $82.49

Q3 2024

Shares 948,782 Value ($000) $71,576 Avg Close $75.84 Range $70.86 - $81.63

Q2 2024

Shares 976,643 Value ($000) $72,408 Avg Close $84.75 Range $71.90 - $96.98

Q1 2024

Shares 1,018,043 Value ($000) $98,343 Avg Close $86.08 Range $79.82 - $100.38

Q4 2023

Shares 1,046,965 Value ($000) $91,494 Avg Close $80.94 Range $67.35 - $89.11

Q3 2023

Shares 1,029,927 Value ($000) $79,191 Avg Close $82.85 Range $75.78 - $92.30

Q2 2023

Shares 1,054,969 Value ($000) $93,892 Avg Close $77.21 Range $67.22 - $92.36

Q1 2023

Shares 1,079,333 Value ($000) $74,312 Avg Close $73.79 Range $65.12 - $81.15

Q4 2022

Shares 1,100,595 Value ($000) $85,054 Avg Close $78.14 Range $68.86 - $85.37

Q3 2022

Shares 1,149,086 Value ($000) $80,034 Avg Close $69.42 Range $57.54 - $79.26

Q2 2022

Shares 1,168,488 Value ($000) $70,588 Avg Close $60.57 Range $53.51 - $68.39

Q1 2022

Shares 1,148,206 Value ($000) $76,482 Avg Close $66.39 Range $49.00 - $79.73

Q4 2021

Shares 1,175,532 Value ($000) $92,902 Avg Close $83.91 Range $75.09 - $101.05

Q3 2021

Shares 1,189,776 Value ($000) $102,392 Avg Close $86.44 Range $80.00 - $90.85

Q2 2021

Shares 1,189,967 Value ($000) $98,553 Avg Close $86.45 Range $80.52 - $94.35

Q1 2021

Shares 119,280 Value ($000) $98,035 Avg Close $86.33 Range $74.31 - $95.28

Q4 2020

Shares 118,192 Value ($000) $109,243 Avg Close $87.68 Range $78.10 - $95.12

Q3 2020

Shares 112,484 Value ($000) $95,444 Avg Close $79.70 Range $66.20 - $93.90

Q2 2020

Shares 100,068 Value ($000) $71,115 Avg Close $64.65 Range $52.02 - $74.71

Q1 2020

Shares 83,270 Value ($000) $48,897 Avg Close $65.18 Range $50.02 - $74.67

Q4 2019

Shares 75,563 Value ($000) $45,210 Avg Close $58.38 Range $51.00 - $62.35

Q3 2019

Shares 74,076 Value ($000) $43,942 Avg Close $59.86 Range $55.57 - $63.94

Q2 2019

Shares 69,419 Value ($000) $38,462 Avg Close $51.11 Range $46.90 - $56.27

Q1 2019

Shares 66,557 Value ($000) $31,043 Avg Close $41.31 Range $32.51 - $48.49

Q4 2018

Shares 56,885 Value ($000) $19,189 Avg Close $36.53 Range $31.59 - $42.50

Q3 2018

Shares 64,082 Value ($000) $26,969 Avg Close $42.74 Range $39.71 - $44.84

Q2 2018

Shares 64,603 Value ($000) $26,657 Avg Close $38.48 Range $34.22 - $42.25

Q1 2018

Shares 64,740 Value ($000) $23,480 Avg Close $34.47 Range $29.54 - $37.86

Q4 2017

Shares 67,334 Value ($000) $19,995 Avg Close $29.30 Range $26.56 - $31.47

Q3 2017

Shares 67,903 Value ($000) $18,215 Avg Close $27.75 Range $25.54 - $28.80

Q2 2017

Shares 69,715 Value ($000) $18,377 Avg Close $24.32 Range $20.14 - $26.88

Q1 2017

Shares 101,517 Value ($000) $21,037 Avg Close $20.32 Range $18.49 - $21.24

Q4 2016

Shares 104,152 Value ($000) $19,631 Avg Close $19.64 Range $17.92 - $22.44

Q3 2016

Shares 107,322 Value ($000) $23,238 Avg Close $21.29 Range $20.25 - $22.48

Q2 2016

Shares 80,304 Value ($000) $17,560 Avg Close $19.77 Range $17.45 - $21.88

Q1 2016

Shares 81,961 Value ($000) $15,422 Avg Close $17.71 Range $14.65 - $20.50

Q4 2015

Shares 83,651 Value ($000) $17,290 Avg Close $19.90 Range $16.80 - $21.35

Q3 2015

Shares 84,953 Value ($000) $14,702 Avg Close $19.15 Range $16.35 - $22.35

Q2 2015

Shares 86,579 Value ($000) $17,425 Avg Close $20.39 Range $19.23 - $21.67

Q1 2015

Shares 87,821 Value ($000) $17,374 Avg Close $18.88 Range $16.88 - $20.19

Q4 2014

Shares 86,564 Value ($000) $15,896 Avg Close $16.16 Range $13.44 - $18.96

Q3 2014

Shares 92,120 Value ($000) $14,328 Avg Close $14.90 Range $13.85 - $16.58

Q2 2014

Shares 95,536 Value ($000) $15,111 Avg Close $16.20 Range $14.70 - $19.34

Q1 2014

Shares 8,481 Value ($000) $1,584 Avg Close $18.86 Range $16.38 - $21.82

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	635,720	$42,746	$70.84	$62.00 - $85.24
Q3 2025	741,641	$62,572	$88.37	$79.94 - $97.43
Q2 2025	782,686	$62,928	$77.90	$71.21 - $83.68
Q1 2025	832,539	$65,962	$76.08	$68.41 - $83.03
Q4 2024	907,848	$64,993	$75.52	$68.26 - $82.49
Q3 2024	948,782	$71,576	$75.84	$70.86 - $81.63
Q2 2024	976,643	$72,408	$84.75	$71.90 - $96.98
Q1 2024	1,018,043	$98,343	$86.08	$79.82 - $100.38
Q4 2023	1,046,965	$91,494	$80.94	$67.35 - $89.11
Q3 2023	1,029,927	$79,191	$82.85	$75.78 - $92.30
Q2 2023	1,054,969	$93,892	$77.21	$67.22 - $92.36
Q1 2023	1,079,333	$74,312	$73.79	$65.12 - $81.15
Q4 2022	1,100,595	$85,054	$78.14	$68.86 - $85.37
Q3 2022	1,149,086	$80,034	$69.42	$57.54 - $79.26
Q2 2022	1,168,488	$70,588	$60.57	$53.51 - $68.39
Q1 2022	1,148,206	$76,482	$66.39	$49.00 - $79.73
Q4 2021	1,175,532	$92,902	$83.91	$75.09 - $101.05
Q3 2021	1,189,776	$102,392	$86.44	$80.00 - $90.85
Q2 2021	1,189,967	$98,553	$86.45	$80.52 - $94.35
Q1 2021	119,280	$98,035	$86.33	$74.31 - $95.28
Q4 2020	118,192	$109,243	$87.68	$78.10 - $95.12
Q3 2020	112,484	$95,444	$79.70	$66.20 - $93.90
Q2 2020	100,068	$71,115	$64.65	$52.02 - $74.71
Q1 2020	83,270	$48,897	$65.18	$50.02 - $74.67
Q4 2019	75,563	$45,210	$58.38	$51.00 - $62.35
Q3 2019	74,076	$43,942	$59.86	$55.57 - $63.94
Q2 2019	69,419	$38,462	$51.11	$46.90 - $56.27
Q1 2019	66,557	$31,043	$41.31	$32.51 - $48.49
Q4 2018	56,885	$19,189	$36.53	$31.59 - $42.50
Q3 2018	64,082	$26,969	$42.74	$39.71 - $44.84
Q2 2018	64,603	$26,657	$38.48	$34.22 - $42.25
Q1 2018	64,740	$23,480	$34.47	$29.54 - $37.86
Q4 2017	67,334	$19,995	$29.30	$26.56 - $31.47
Q3 2017	67,903	$18,215	$27.75	$25.54 - $28.80
Q2 2017	69,715	$18,377	$24.32	$20.14 - $26.88
Q1 2017	101,517	$21,037	$20.32	$18.49 - $21.24
Q4 2016	104,152	$19,631	$19.64	$17.92 - $22.44
Q3 2016	107,322	$23,238	$21.29	$20.25 - $22.48
Q2 2016	80,304	$17,560	$19.77	$17.45 - $21.88
Q1 2016	81,961	$15,422	$17.71	$14.65 - $20.50
Q4 2015	83,651	$17,290	$19.90	$16.80 - $21.35
Q3 2015	84,953	$14,702	$19.15	$16.35 - $22.35
Q2 2015	86,579	$17,425	$20.39	$19.23 - $21.67
Q1 2015	87,821	$17,374	$18.88	$16.88 - $20.19
Q4 2014	86,564	$15,896	$16.16	$13.44 - $18.96
Q3 2014	92,120	$14,328	$14.90	$13.85 - $16.58
Q2 2014	95,536	$15,111	$16.20	$14.70 - $19.34
Q1 2014	8,481	$1,584	$18.86	$16.38 - $21.82