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CoStar Group

791 hedge funds and large institutions have $16.4B invested in CoStar Group in 2026 Q1 according to their latest regulatory filings, with 125 funds opening new positions, 307 increasing their positions, 276 reducing their positions, and 164 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: 125 | Existing positions closed: 164

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
791
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
SI
301
Stephens Inc
Arkansas
$1.72M
Nisa Investment Advisors
302
Nisa Investment Advisors
Missouri
$1.72M
ECSS
303
Eurizon Capital SGR SpA
$1.7M
SOADOR
304
State of Alaska Department of Revenue
Alaska
$1.69M
KIA
305
Knollwood Investment Advisory
Maryland
$1.69M
RFC
306
Regions Financial Corp
Alabama
$1.67M
EF
307
Empowered Funds
Pennsylvania
$1.65M
OBC
308
Oakum Bay Capital
Connecticut
$1.65M
Arrowstreet Capital
309
Arrowstreet Capital
Massachusetts
$1.65M
NB
310
Norinchukin Bank
Japan
$1.64M
AI
311
Atom Investors
Texas
$1.63M
NG
312
Norden Group
Utah
$1.59M
Macquarie Group
313
Macquarie Group
Australia
$1.57M
ET
314
Entropy Technologies
New York
$1.56M
Pathstone Holdings
315
Pathstone Holdings
New Jersey
$1.56M
Wealth Enhancement Advisory Services
316
Wealth Enhancement Advisory Services
Minnesota
$1.54M
RSC
317
Red Spruce Capital
Pennsylvania
$1.53M
PWG
318
Portside Wealth Group
Utah
$1.51M
SA
319
Sanctuary Advisors
Indiana
$1.5M
BPWM
320
Badgley Phelps Wealth Managers
Washington
$1.5M
Cambridge Investment Research Advisors
321
Cambridge Investment Research Advisors
Iowa
$1.49M
FAMI
322
Fideuram Asset Management (Ireland)
$1.48M
Thrivent Financial for Lutherans
323
Thrivent Financial for Lutherans
Minnesota
$1.46M
SAM
324
Storebrand Asset Management
Norway
$1.46M
HT
325
Headlands Technologies
Illinois
$1.43M