COSTAR GROUP INC

Ticker: CSGP CUSIP: 22160N109 Class: EQTY

ALLIANCEBERNSTEIN L.P.'s Holding History (CIK: 0001109448)

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

Q4 2025

Shares 422,173 Value ($000) $28,387 Avg Close $70.84 Range $62.00 - $85.24

Q3 2025

Shares 464,823 Value ($000) $39,217 Avg Close $88.37 Range $79.94 - $97.43

Q2 2025

Shares 460,671 Value ($000) $37,038 Avg Close $77.90 Range $71.21 - $83.68

Q1 2025

Shares 477,506 Value ($000) $37,833 Avg Close $76.08 Range $68.41 - $83.03

Q4 2024

Shares 468,401 Value ($000) $33,533 Avg Close $75.52 Range $68.26 - $82.49

Q3 2024

Shares 468,883 Value ($000) $35,373 Avg Close $75.84 Range $70.86 - $81.63

Q2 2024

Shares 563,008 Value ($000) $41,741 Avg Close $84.75 Range $71.90 - $96.98

Q1 2024

Shares 536,986 Value ($000) $51,873 Avg Close $86.08 Range $79.82 - $100.38

Q4 2023

Shares 484,244 Value ($000) $42,318 Avg Close $80.94 Range $67.35 - $89.11

Q3 2023

Shares 480,913 Value ($000) $36,977 Avg Close $82.85 Range $75.78 - $92.30

Q2 2023

Shares 543,253 Value ($000) $48,350 Avg Close $77.21 Range $67.22 - $92.36

Q1 2023

Shares 494,289 Value ($000) $34,032 Avg Close $73.79 Range $65.12 - $81.15

Q4 2022

Shares 514,574 Value ($000) $39,766 Avg Close $78.14 Range $68.86 - $85.37

Q3 2022

Shares 499,025 Value ($000) $34,757 Avg Close $69.42 Range $57.54 - $79.26

Q2 2022

Shares 195,357 Value ($000) $11,802 Avg Close $60.57 Range $53.51 - $68.39

Q1 2022

Shares 193,555 Value ($000) $12,893 Avg Close $66.39 Range $49.00 - $79.73

Q4 2021

Shares 202,602 Value ($000) $16,012 Avg Close $83.91 Range $75.09 - $101.05

Q3 2021

Shares 213,635 Value ($000) $18,385 Avg Close $86.44 Range $80.00 - $90.85

Q2 2021

Shares 216,420 Value ($000) $17,924 Avg Close $86.45 Range $80.52 - $94.35

Q1 2021

Shares 24,178 Value ($000) $19,872 Avg Close $86.33 Range $74.31 - $95.28

Q4 2020

Shares 24,223 Value ($000) $22,389 Avg Close $87.68 Range $78.10 - $95.12

Q3 2020

Shares 76,353 Value ($000) $64,786 Avg Close $79.70 Range $66.20 - $93.90

Q2 2020

Shares 99,822 Value ($000) $70,941 Avg Close $64.65 Range $52.02 - $74.71

Q1 2020

Shares 96,058 Value ($000) $56,406 Avg Close $65.18 Range $50.02 - $74.67

Q4 2019

Shares 137,824 Value ($000) $82,460 Avg Close $58.38 Range $51.00 - $62.35

Q3 2019

Shares 209,047 Value ($000) $124,007 Avg Close $59.86 Range $55.57 - $63.94

Q2 2019

Shares 196,205 Value ($000) $108,709 Avg Close $51.11 Range $46.90 - $56.27

Q1 2019

Shares 175,474 Value ($000) $81,845 Avg Close $41.31 Range $32.51 - $48.49

Q4 2018

Shares 156,703 Value ($000) $52,862 Avg Close $36.53 Range $31.59 - $42.50

Q3 2018

Shares 162,758 Value ($000) $68,495 Avg Close $42.74 Range $39.71 - $44.84

Q2 2018

Shares 202,593 Value ($000) $83,596 Avg Close $38.48 Range $34.22 - $42.25

Q1 2018

Shares 270,676 Value ($000) $98,169 Avg Close $34.47 Range $29.54 - $37.86

Q4 2017

Shares 401,918 Value ($000) $119,350 Avg Close $29.30 Range $26.56 - $31.47

Q3 2017

Shares 423,589 Value ($000) $113,628 Avg Close $27.75 Range $25.54 - $28.80

Q2 2017

Shares 488,584 Value ($000) $128,791 Avg Close $24.32 Range $20.14 - $26.88

Q1 2017

Shares 460,518 Value ($000) $95,429 Avg Close $20.32 Range $18.49 - $21.24

Q4 2016

Shares 513,212 Value ($000) $96,735 Avg Close $19.64 Range $17.92 - $22.44

Q3 2016

Shares 496,708 Value ($000) $107,552 Avg Close $21.29 Range $20.25 - $22.48

Q2 2016

Shares 544,283 Value ($000) $119,013 Avg Close $19.77 Range $17.45 - $21.88

Q1 2016

Shares 621,633 Value ($000) $116,973 Avg Close $17.71 Range $14.65 - $20.50

Q4 2015

Shares 780,298 Value ($000) $161,280 Avg Close $19.90 Range $16.80 - $21.35

Q3 2015

Shares 860,782 Value ($000) $148,967 Avg Close $19.15 Range $16.35 - $22.35

Q2 2015

Shares 796,564 Value ($000) $160,316 Avg Close $20.39 Range $19.23 - $21.67

Q1 2015

Shares 719,428 Value ($000) $142,324 Avg Close $18.88 Range $16.88 - $20.19

Q4 2014

Shares 502,113 Value ($000) $92,203 Avg Close $16.16 Range $13.44 - $18.96

Q3 2014

Shares 576,510 Value ($000) $89,670 Avg Close $14.90 Range $13.85 - $16.58

Q2 2014

Shares 1,121,281 Value ($000) $177,353 Avg Close $16.20 Range $14.70 - $19.34

Q1 2014

Shares 1,028,841 Value ($000) $192,126 Avg Close $18.86 Range $16.38 - $21.82

Q4 2013

Shares 1,015,733 Value ($000) $187,484 Avg Close $17.69 Range $16.07 - $18.84

Q3 2013

Shares 1,078,112 Value ($000) $181,015 Avg Close $15.34 Range $12.98 - $17.22

Q2 2013

Shares 1,255,116 Value ($000) $161,998 Avg Close $11.32 Range $10.46 - $13.07

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	422,173	$28,387	$70.84	$62.00 - $85.24
Q3 2025	464,823	$39,217	$88.37	$79.94 - $97.43
Q2 2025	460,671	$37,038	$77.90	$71.21 - $83.68
Q1 2025	477,506	$37,833	$76.08	$68.41 - $83.03
Q4 2024	468,401	$33,533	$75.52	$68.26 - $82.49
Q3 2024	468,883	$35,373	$75.84	$70.86 - $81.63
Q2 2024	563,008	$41,741	$84.75	$71.90 - $96.98
Q1 2024	536,986	$51,873	$86.08	$79.82 - $100.38
Q4 2023	484,244	$42,318	$80.94	$67.35 - $89.11
Q3 2023	480,913	$36,977	$82.85	$75.78 - $92.30
Q2 2023	543,253	$48,350	$77.21	$67.22 - $92.36
Q1 2023	494,289	$34,032	$73.79	$65.12 - $81.15
Q4 2022	514,574	$39,766	$78.14	$68.86 - $85.37
Q3 2022	499,025	$34,757	$69.42	$57.54 - $79.26
Q2 2022	195,357	$11,802	$60.57	$53.51 - $68.39
Q1 2022	193,555	$12,893	$66.39	$49.00 - $79.73
Q4 2021	202,602	$16,012	$83.91	$75.09 - $101.05
Q3 2021	213,635	$18,385	$86.44	$80.00 - $90.85
Q2 2021	216,420	$17,924	$86.45	$80.52 - $94.35
Q1 2021	24,178	$19,872	$86.33	$74.31 - $95.28
Q4 2020	24,223	$22,389	$87.68	$78.10 - $95.12
Q3 2020	76,353	$64,786	$79.70	$66.20 - $93.90
Q2 2020	99,822	$70,941	$64.65	$52.02 - $74.71
Q1 2020	96,058	$56,406	$65.18	$50.02 - $74.67
Q4 2019	137,824	$82,460	$58.38	$51.00 - $62.35
Q3 2019	209,047	$124,007	$59.86	$55.57 - $63.94
Q2 2019	196,205	$108,709	$51.11	$46.90 - $56.27
Q1 2019	175,474	$81,845	$41.31	$32.51 - $48.49
Q4 2018	156,703	$52,862	$36.53	$31.59 - $42.50
Q3 2018	162,758	$68,495	$42.74	$39.71 - $44.84
Q2 2018	202,593	$83,596	$38.48	$34.22 - $42.25
Q1 2018	270,676	$98,169	$34.47	$29.54 - $37.86
Q4 2017	401,918	$119,350	$29.30	$26.56 - $31.47
Q3 2017	423,589	$113,628	$27.75	$25.54 - $28.80
Q2 2017	488,584	$128,791	$24.32	$20.14 - $26.88
Q1 2017	460,518	$95,429	$20.32	$18.49 - $21.24
Q4 2016	513,212	$96,735	$19.64	$17.92 - $22.44
Q3 2016	496,708	$107,552	$21.29	$20.25 - $22.48
Q2 2016	544,283	$119,013	$19.77	$17.45 - $21.88
Q1 2016	621,633	$116,973	$17.71	$14.65 - $20.50
Q4 2015	780,298	$161,280	$19.90	$16.80 - $21.35
Q3 2015	860,782	$148,967	$19.15	$16.35 - $22.35
Q2 2015	796,564	$160,316	$20.39	$19.23 - $21.67
Q1 2015	719,428	$142,324	$18.88	$16.88 - $20.19
Q4 2014	502,113	$92,203	$16.16	$13.44 - $18.96
Q3 2014	576,510	$89,670	$14.90	$13.85 - $16.58
Q2 2014	1,121,281	$177,353	$16.20	$14.70 - $19.34
Q1 2014	1,028,841	$192,126	$18.86	$16.38 - $21.82
Q4 2013	1,015,733	$187,484	$17.69	$16.07 - $18.84
Q3 2013	1,078,112	$181,015	$15.34	$12.98 - $17.22
Q2 2013	1,255,116	$161,998	$11.32	$10.46 - $13.07