DOSSIER · 13F Holders · Q2 2026

COSTAR GROUP INC

7 institutions still hold COSTAR GROUP INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 22160N909·7 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$29M
visible holders
Holders
7
filers reporting
Concentration
39.33%
LANDMARK INVESTMENT PARTNERS, L.P. #1
top holder share
AI Holders Summary · Q2 2026

7 institutions reported COSTAR GROUP INC in Q2 2026. LANDMARK INVESTMENT PARTNERS, L.P. leads at 39.3% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
LANDMARK INVESTMENT PARTNERS, L.P.
CIK 0002023551
$11M369K2.83%Q2 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$8M293K0.01%Q2 2026
03
IMC-Chicago, LLC
CIK 0001452861· Market maker
$5M180K0.00%Q2 2026
04
SIMPLEX TRADING, LLC
CIK 0001488542
$3M92K0.00%Q2 2026
05
JPMORGAN CHASE & CO
CIK 0000019617
$1M45K0.00%Q2 2026
06
Itau Unibanco Holding S.A.
CIK 0001132597
$85K2K0.00%Q2 2026
07
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025