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BLAIR WILLIAM & CO/IL

Position in CSGP — Costar Group, Inc.

CIK 902367 CHICAGO, IL

Position in CSGP

as of Jun 30, 2026 · filed Aug 11, 2026
Position Value
$18,639,062
-$17,679,564 QoQ
Shares Held
658,159
-26.9% QoQ
Ownership
0.162%
of shares outstanding
% of Portfolio
0.06%
of 13F equity value
Holder Rank
#85
of 749 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 81% Shared 0% None 19%

Common Shares in CSGP Over Time

Shares Held

Position Value (USD)

Position in Real Estate Services

Real Estate · as of Jun 30, 2026

BLAIR WILLIAM & CO/IL holds $148,360,830 across 8 Real Estate Services names. CSGP ranks #3 (12.6% of the industry book) .

# Ticker Company Shares Value (USD) Open
3 CSGP
Costar Group, Inc.
This page
658,159 $18,639,062

All Filings in CSGP

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26 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $18,639,062 658,159
2026-03-31 $36,318,626 900,313
2025-12-31 $136,061,686 2,023,523
2025-09-30 $263,949,267 3,128,473
2025-06-30 $230,841,424 2,871,162
2025-03-31 $230,045,731 2,903,518
2024-12-31 $242,972,952 3,393,951
2024-09-30 $290,507,067 3,850,836
2024-06-30 $326,048,295 4,397,738
2024-03-31 $426,950,554 4,419,778
2023-12-31 $383,902,347 4,392,978
2023-09-30 $322,246,682 4,191,009
2023-06-30 $350,644,603 3,939,827
2023-03-31 $258,534,022 3,755,033
2022-12-31 $286,732,061 3,710,301
2022-09-30 $240,549,717 3,453,693
2022-06-30 $193,842,641 3,208,784
2022-03-31 $183,519,542 2,755,135
2021-12-31 $220,916,194 2,795,346
2021-09-30 $234,419,350 2,723,906
2021-06-30 $221,573,812 2,675,366
2021-03-31 $215,866,120 262,646
2020-12-31 $239,011,413 258,592
2020-09-30 $218,379,321 257,368
2020-06-30 $181,596,794 255,529
2020-03-31 $147,364,459 250,957