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CoStar Group

786 hedge funds and large institutions have $16.4B invested in CoStar Group in 2026 Q1 according to their latest regulatory filings, with 126 funds opening new positions, 306 increasing their positions, 272 reducing their positions, and 166 closing their positions.

New
Increased
Maintained
Reduced
Closed

more call options, than puts

Call options by funds: $ | Put options by funds: $

more repeat investments, than reductions

Existing positions increased: | Existing positions reduced:

less ownership

Funds ownership:

less funds holding

Funds holding:

24% less first-time investments, than exits

New positions opened: 126 | Existing positions closed: 166

41% less capital invested

Capital invested by funds: $27.8B → $16.4B (-$11.3B)

59% less funds holding in top 10

Funds holding in top 10: 177 (-10)

Holders
786
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
7
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
$142M
Puts
$39.3M
Net Calls
Net Calls Change

Top Sellers

1 -$302M
2 -$233M
3 -$216M
4
TP
Third Point
New York
-$213M
5
BAMCO Inc
BAMCO Inc
New York
-$166M
Name Holding Trade Value Shares
Change
Change in
Stake
ECSS
301
Eurizon Capital SGR SpA
$1.7M
SOADOR
302
State of Alaska Department of Revenue
Alaska
$1.69M
KIA
303
Knollwood Investment Advisory
Maryland
$1.69M
RFC
304
Regions Financial Corp
Alabama
$1.67M
EF
305
Empowered Funds
Pennsylvania
$1.65M
OBC
306
Oakum Bay Capital
Connecticut
$1.65M
Arrowstreet Capital
307
Arrowstreet Capital
Massachusetts
$1.65M
NB
308
Norinchukin Bank
Japan
$1.64M
AI
309
Atom Investors
Texas
$1.63M
NG
310
Norden Group
Utah
$1.59M
Macquarie Group
311
Macquarie Group
Australia
$1.57M
ET
312
Entropy Technologies
New York
$1.56M
Pathstone Holdings
313
Pathstone Holdings
New Jersey
$1.56M
Wealth Enhancement Advisory Services
314
Wealth Enhancement Advisory Services
Minnesota
$1.54M
RSC
315
Red Spruce Capital
Pennsylvania
$1.53M
PWG
316
Portside Wealth Group
Utah
$1.51M
SA
317
Sanctuary Advisors
Indiana
$1.5M
BPWM
318
Badgley Phelps Wealth Managers
Washington
$1.5M
Cambridge Investment Research Advisors
319
Cambridge Investment Research Advisors
Iowa
$1.49M
FAMI
320
Fideuram Asset Management (Ireland)
$1.48M
Thrivent Financial for Lutherans
321
Thrivent Financial for Lutherans
Minnesota
$1.46M
SAM
322
Storebrand Asset Management
Norway
$1.46M
HT
323
Headlands Technologies
Illinois
$1.43M
QCM
324
Qsemble Capital Management
New York
$1.43M
SC
325
Scotia Capital
Ontario, Canada
$1.41M