COSTAR GROUP INC

Ticker: CSGP CUSIP: 22160N109 Class: EQTY

GILDER GAGNON HOWE & CO LLC's Holding History (CIK: 0000902464)

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

Q4 2025

Shares 240,034 Value ($000) $16,140 Avg Close $70.84 Range $62.00 - $85.24

Q3 2025

Shares 278,503 Value ($000) $23,497 Avg Close $88.37 Range $79.94 - $97.43

Q2 2025

Shares 245,432 Value ($000) $19,733 Avg Close $77.90 Range $71.21 - $83.68

Q1 2025

Shares 245,760 Value ($000) $19,472 Avg Close $76.08 Range $68.41 - $83.03

Q4 2024

Shares 165,997 Value ($000) $11,884 Avg Close $75.52 Range $68.26 - $82.49

Q3 2024

Shares 189,311 Value ($000) $14,282 Avg Close $75.84 Range $70.86 - $81.63

Q2 2024

Shares 163,520 Value ($000) $12,123 Avg Close $84.75 Range $71.90 - $96.98

Q1 2024

Shares 142,364 Value ($000) $13,752 Avg Close $86.08 Range $79.82 - $100.38

Q1 2017

Shares 70,292 Value ($000) $14,566 Avg Close $20.32 Range $18.49 - $21.24

Q4 2016

Shares 80,227 Value ($000) $15,122 Avg Close $19.64 Range $17.92 - $22.44

Q3 2016

Shares 80,847 Value ($000) $17,506 Avg Close $21.29 Range $20.25 - $22.48

Q2 2016

Shares 81,813 Value ($000) $17,889 Avg Close $19.77 Range $17.45 - $21.88

Q1 2016

Shares 82,811 Value ($000) $15,583 Avg Close $17.71 Range $14.65 - $20.50

Q4 2015

Shares 108,212 Value ($000) $22,366 Avg Close $19.90 Range $16.80 - $21.35

Q3 2015

Shares 109,030 Value ($000) $18,869 Avg Close $19.15 Range $16.35 - $22.35

Q2 2015

Shares 130,011 Value ($000) $26,166 Avg Close $20.39 Range $19.23 - $21.67

Q1 2015

Shares 130,413 Value ($000) $25,800 Avg Close $18.88 Range $16.88 - $20.19

Q4 2014

Shares 147,502 Value ($000) $27,086 Avg Close $16.16 Range $13.44 - $18.96

Q3 2014

Shares 351,051 Value ($000) $54,602 Avg Close $14.90 Range $13.85 - $16.58

Q2 2014

Shares 352,425 Value ($000) $55,743 Avg Close $16.20 Range $14.70 - $19.34

Q1 2014

Shares 180,917 Value ($000) $33,784 Avg Close $18.86 Range $16.38 - $21.82

Q4 2013

Shares 206,841 Value ($000) $38,179 Avg Close $17.69 Range $16.07 - $18.84

Q3 2013

Shares 210,184 Value ($000) $35,292 Avg Close $15.34 Range $12.98 - $17.22

Q2 2013

Shares 213,014 Value ($000) $27,493,717 Avg Close $11.32 Range $10.46 - $13.07

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	240,034	$16,140	$70.84	$62.00 - $85.24
Q3 2025	278,503	$23,497	$88.37	$79.94 - $97.43
Q2 2025	245,432	$19,733	$77.90	$71.21 - $83.68
Q1 2025	245,760	$19,472	$76.08	$68.41 - $83.03
Q4 2024	165,997	$11,884	$75.52	$68.26 - $82.49
Q3 2024	189,311	$14,282	$75.84	$70.86 - $81.63
Q2 2024	163,520	$12,123	$84.75	$71.90 - $96.98
Q1 2024	142,364	$13,752	$86.08	$79.82 - $100.38
Q1 2017	70,292	$14,566	$20.32	$18.49 - $21.24
Q4 2016	80,227	$15,122	$19.64	$17.92 - $22.44
Q3 2016	80,847	$17,506	$21.29	$20.25 - $22.48
Q2 2016	81,813	$17,889	$19.77	$17.45 - $21.88
Q1 2016	82,811	$15,583	$17.71	$14.65 - $20.50
Q4 2015	108,212	$22,366	$19.90	$16.80 - $21.35
Q3 2015	109,030	$18,869	$19.15	$16.35 - $22.35
Q2 2015	130,011	$26,166	$20.39	$19.23 - $21.67
Q1 2015	130,413	$25,800	$18.88	$16.88 - $20.19
Q4 2014	147,502	$27,086	$16.16	$13.44 - $18.96
Q3 2014	351,051	$54,602	$14.90	$13.85 - $16.58
Q2 2014	352,425	$55,743	$16.20	$14.70 - $19.34
Q1 2014	180,917	$33,784	$18.86	$16.38 - $21.82
Q4 2013	206,841	$38,179	$17.69	$16.07 - $18.84
Q3 2013	210,184	$35,292	$15.34	$12.98 - $17.22
Q2 2013	213,014	$27,493,717	$11.32	$10.46 - $13.07