COSTAR GROUP INC

Ticker: CSGP CUSIP: 22160N109 Class: EQTY

BLAIR WILLIAM & CO/IL's Holding History (CIK: 0000902367)

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

Q4 2025

Shares 2,023,523 Value ($000) $136,062 Avg Close $70.84 Range $62.00 - $85.24

Q3 2025

Shares 3,128,473 Value ($000) $263,949 Avg Close $88.37 Range $79.94 - $97.43

Q2 2025

Shares 2,871,162 Value ($000) $230,841 Avg Close $77.90 Range $71.21 - $83.68

Q1 2025

Shares 2,903,518 Value ($000) $230,046 Avg Close $76.08 Range $68.41 - $83.03

Q4 2024

Shares 3,393,951 Value ($000) $242,973 Avg Close $75.52 Range $68.26 - $82.49

Q3 2024

Shares 3,850,836 Value ($000) $290,507 Avg Close $75.84 Range $70.86 - $81.63

Q2 2024

Shares 4,397,738 Value ($000) $326,048 Avg Close $84.75 Range $71.90 - $96.98

Q1 2024

Shares 4,419,778 Value ($000) $426,951 Avg Close $86.08 Range $79.82 - $100.38

Q4 2023

Shares 4,392,978 Value ($000) $383,902 Avg Close $80.94 Range $67.35 - $89.11

Q3 2023

Shares 4,191,009 Value ($000) $322,247 Avg Close $82.85 Range $75.78 - $92.30

Q2 2023

Shares 3,939,827 Value ($000) $350,645 Avg Close $77.21 Range $67.22 - $92.36

Q1 2023

Shares 3,755,033 Value ($000) $258,534 Avg Close $73.79 Range $65.12 - $81.15

Q4 2022

Shares 3,710,301 Value ($000) $286,732 Avg Close $78.14 Range $68.86 - $85.37

Q3 2022

Shares 3,453,693 Value ($000) $240,550 Avg Close $69.42 Range $57.54 - $79.26

Q2 2022

Shares 3,208,784 Value ($000) $193,843 Avg Close $60.57 Range $53.51 - $68.39

Q1 2022

Shares 2,755,135 Value ($000) $183,520 Avg Close $66.39 Range $49.00 - $79.73

Q4 2021

Shares 2,795,346 Value ($000) $220,916 Avg Close $83.91 Range $75.09 - $101.05

Q3 2021

Shares 2,723,906 Value ($000) $234,419 Avg Close $86.44 Range $80.00 - $90.85

Q2 2021

Shares 2,675,366 Value ($000) $221,574 Avg Close $86.45 Range $80.52 - $94.35

Q1 2021

Shares 262,646 Value ($000) $215,866 Avg Close $86.33 Range $74.31 - $95.28

Q4 2020

Shares 258,592 Value ($000) $239,011 Avg Close $87.68 Range $78.10 - $95.12

Q3 2020

Shares 257,368 Value ($000) $218,379 Avg Close $79.70 Range $66.20 - $93.90

Q2 2020

Shares 255,529 Value ($000) $181,597 Avg Close $64.65 Range $52.02 - $74.71

Q1 2020

Shares 250,957 Value ($000) $147,364 Avg Close $65.18 Range $50.02 - $74.67

Q4 2019

Shares 255,829 Value ($000) $153,062 Avg Close $58.38 Range $51.00 - $62.35

Q3 2019

Shares 252,070 Value ($000) $149,528 Avg Close $59.86 Range $55.57 - $63.94

Q2 2019

Shares 257,121 Value ($000) $142,460 Avg Close $51.11 Range $46.90 - $56.27

Q1 2019

Shares 259,053 Value ($000) $120,827 Avg Close $41.31 Range $32.51 - $48.49

Q4 2018

Shares 249,082 Value ($000) $84,025 Avg Close $36.53 Range $31.59 - $42.50

Q3 2018

Shares 253,297 Value ($000) $106,598 Avg Close $42.74 Range $39.71 - $44.84

Q2 2018

Shares 256,228 Value ($000) $105,727 Avg Close $38.48 Range $34.22 - $42.25

Q1 2018

Shares 272,506 Value ($000) $98,832 Avg Close $34.47 Range $29.54 - $37.86

Q4 2017

Shares 342,776 Value ($000) $101,787 Avg Close $29.30 Range $26.56 - $31.47

Q3 2017

Shares 351,124 Value ($000) $94,189 Avg Close $27.75 Range $25.54 - $28.80

Q2 2017

Shares 355,574 Value ($000) $93,729 Avg Close $24.32 Range $20.14 - $26.88

Q1 2017

Shares 366,331 Value ($000) $75,214 Avg Close $20.32 Range $18.49 - $21.24

Q4 2016

Shares 351,839 Value ($000) $66,318 Avg Close $19.64 Range $17.92 - $22.44

Q3 2016

Shares 352,160 Value ($000) $76,253 Avg Close $21.29 Range $20.25 - $22.48

Q2 2016

Shares 329,097 Value ($000) $71,960 Avg Close $19.77 Range $17.45 - $21.88

Q1 2016

Shares 339,377 Value ($000) $63,861 Avg Close $17.71 Range $14.65 - $20.50

Q4 2015

Shares 331,012 Value ($000) $68,417 Avg Close $19.90 Range $16.80 - $21.35

Q3 2015

Shares 383,178 Value ($000) $66,312 Avg Close $19.15 Range $16.35 - $22.35

Q2 2015

Shares 1,408,955 Value ($000) $283,566 Avg Close $20.39 Range $19.23 - $21.67

Q1 2015

Shares 1,402,658 Value ($000) $277,488 Avg Close $18.88 Range $16.88 - $20.19

Q4 2014

Shares 1,458,316 Value ($000) $267,790 Avg Close $16.16 Range $13.44 - $18.96

Q3 2014

Shares 1,270,270 Value ($000) $197,578 Avg Close $14.90 Range $13.85 - $16.58

Q2 2014

Shares 1,280,474 Value ($000) $202,532 Avg Close $16.20 Range $14.70 - $19.34

Q1 2014

Shares 960,602 Value ($000) $179,382 Avg Close $18.86 Range $16.38 - $21.82

Q4 2013

Shares 952,657 Value ($000) $175,841 Avg Close $17.69 Range $16.07 - $18.84

Q3 2013

Shares 1,062,423 Value ($000) $178,393 Avg Close $15.34 Range $12.98 - $17.22

Q2 2013

Shares 1,068,457 Value ($000) $137,905 Avg Close $11.32 Range $10.46 - $13.07

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	2,023,523	$136,062	$70.84	$62.00 - $85.24
Q3 2025	3,128,473	$263,949	$88.37	$79.94 - $97.43
Q2 2025	2,871,162	$230,841	$77.90	$71.21 - $83.68
Q1 2025	2,903,518	$230,046	$76.08	$68.41 - $83.03
Q4 2024	3,393,951	$242,973	$75.52	$68.26 - $82.49
Q3 2024	3,850,836	$290,507	$75.84	$70.86 - $81.63
Q2 2024	4,397,738	$326,048	$84.75	$71.90 - $96.98
Q1 2024	4,419,778	$426,951	$86.08	$79.82 - $100.38
Q4 2023	4,392,978	$383,902	$80.94	$67.35 - $89.11
Q3 2023	4,191,009	$322,247	$82.85	$75.78 - $92.30
Q2 2023	3,939,827	$350,645	$77.21	$67.22 - $92.36
Q1 2023	3,755,033	$258,534	$73.79	$65.12 - $81.15
Q4 2022	3,710,301	$286,732	$78.14	$68.86 - $85.37
Q3 2022	3,453,693	$240,550	$69.42	$57.54 - $79.26
Q2 2022	3,208,784	$193,843	$60.57	$53.51 - $68.39
Q1 2022	2,755,135	$183,520	$66.39	$49.00 - $79.73
Q4 2021	2,795,346	$220,916	$83.91	$75.09 - $101.05
Q3 2021	2,723,906	$234,419	$86.44	$80.00 - $90.85
Q2 2021	2,675,366	$221,574	$86.45	$80.52 - $94.35
Q1 2021	262,646	$215,866	$86.33	$74.31 - $95.28
Q4 2020	258,592	$239,011	$87.68	$78.10 - $95.12
Q3 2020	257,368	$218,379	$79.70	$66.20 - $93.90
Q2 2020	255,529	$181,597	$64.65	$52.02 - $74.71
Q1 2020	250,957	$147,364	$65.18	$50.02 - $74.67
Q4 2019	255,829	$153,062	$58.38	$51.00 - $62.35
Q3 2019	252,070	$149,528	$59.86	$55.57 - $63.94
Q2 2019	257,121	$142,460	$51.11	$46.90 - $56.27
Q1 2019	259,053	$120,827	$41.31	$32.51 - $48.49
Q4 2018	249,082	$84,025	$36.53	$31.59 - $42.50
Q3 2018	253,297	$106,598	$42.74	$39.71 - $44.84
Q2 2018	256,228	$105,727	$38.48	$34.22 - $42.25
Q1 2018	272,506	$98,832	$34.47	$29.54 - $37.86
Q4 2017	342,776	$101,787	$29.30	$26.56 - $31.47
Q3 2017	351,124	$94,189	$27.75	$25.54 - $28.80
Q2 2017	355,574	$93,729	$24.32	$20.14 - $26.88
Q1 2017	366,331	$75,214	$20.32	$18.49 - $21.24
Q4 2016	351,839	$66,318	$19.64	$17.92 - $22.44
Q3 2016	352,160	$76,253	$21.29	$20.25 - $22.48
Q2 2016	329,097	$71,960	$19.77	$17.45 - $21.88
Q1 2016	339,377	$63,861	$17.71	$14.65 - $20.50
Q4 2015	331,012	$68,417	$19.90	$16.80 - $21.35
Q3 2015	383,178	$66,312	$19.15	$16.35 - $22.35
Q2 2015	1,408,955	$283,566	$20.39	$19.23 - $21.67
Q1 2015	1,402,658	$277,488	$18.88	$16.88 - $20.19
Q4 2014	1,458,316	$267,790	$16.16	$13.44 - $18.96
Q3 2014	1,270,270	$197,578	$14.90	$13.85 - $16.58
Q2 2014	1,280,474	$202,532	$16.20	$14.70 - $19.34
Q1 2014	960,602	$179,382	$18.86	$16.38 - $21.82
Q4 2013	952,657	$175,841	$17.69	$16.07 - $18.84
Q3 2013	1,062,423	$178,393	$15.34	$12.98 - $17.22
Q2 2013	1,068,457	$137,905	$11.32	$10.46 - $13.07