13F Insight
DOSSIER · 13F Holders · Q1 2026Technology · Services-Business Services, NECBellwetherCompounder
CSGP

COSTAR GROUP INC

841 institutions still hold COSTAR GROUP INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 22160N109·Services-Business Services, NEC·841 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 3.2%
vs prior quarter
13F value held
$10.7B
50.0% inst. owned
of float
Holders
841
-100 QoQ
filers reporting
Activity
+31 / −9
+811 added · −856 reduced
this quarter
Concentration
14.48%
Vanguard Portfolio Management #1
top holder share
AI Holders Summary · Q1 2026

841 institutions reported CSGP in Q1 2026. Vanguard Portfolio Management leads at 14.5% of the visible book. -100 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
Vanguard Portfolio Management
CIK 0002100121
$1.5B38.2M0.08%Q1 202602
BlackRock, Inc.
CIK 0002012383
$1.4B33.8M0.02%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$1.1B27.4M0.03%Q1 202604
STATE STREET CORP
CIK 0000093751
$752M18.7M0.03%Q1 202605
PRINCIPAL FINANCIAL GROUP INC
CIK 0001126328
$714M17.7M0.38%Q1 202606
BAMCO INC /NY/
CIK 0001017918
$658M16.3M1.99%Q1 202607
Capital International Investors
CIK 0001562230
$626M15.5M0.15%Q1 202608
BAILLIE GIFFORD & CO
CIK 0001088875
$549M13.6M0.56%Q1 202609
POLEN CAPITAL MANAGEMENT LLC
CIK 0001034524
$507M12.6M3.51%Q1 202610
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$500M12.4M0.03%Q1 202611
AKRE CAPITAL MANAGEMENT LLC
CIK 0001112520
$417M10.3M6.80%Q1 202612
GOLDMAN SACHS GROUP INC
CIK 0000886982
$373M9.3M0.04%Q1 202613
JANUS HENDERSON GROUP PLC
CIK 0001274173
$312M7.7M0.15%Q1 202614
Invesco Ltd.
CIK 0000914208
$288M7.1M0.04%Q1 202615
MORGAN STANLEY
CIK 0000895421
$218M5.4M0.01%Q1 202616
Capital Research Global Investors
CIK 0001422848
$176M4.4M0.03%Q1 202617
BANK OF AMERICA CORP /DE/
CIK 0000070858
$144M3.6M0.01%Q1 202618
NORTHERN TRUST CORP
CIK 0000073124· Index
$138M3.4M0.02%Q1 202619
Meritage Group LP
CIK 0001427119
$134M3.3M5.07%Q1 202620
Amundi
CIK 0001330387
$132M3.3M0.04%Q1 2026
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