Ticker · CUSIP 22160N109

CSGP

COSTAR GROUP INC

Real Estate·Real Estate Services

···Share

Holders (tracked)

Combined shares

61,389,401

Combined value

$4.05B

Last close

$40.04

Quarter

2025Q4

Tracked holders · last 8 quarters

+6 vs previous quarter over the last 8.

Price is -39.3% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

30 events

Wellington Management trimmed2026-02-17
−12,746 shares · 2025Q4
13F
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+205,000 shares · 2025Q4
13F
Daniel Loeb (Third Point) added2026-02-17
+148,000 shares · 2025Q4
13F
Ken Griffin (Citadel Advisors) trimmed2026-02-17
−1,122,075 shares · 2025Q4
13F
Andreas Halvorsen (Viking Global) trimmed2026-02-17
−407,147 shares · 2025Q4
13F
AQR Capital Management added2026-02-17
+45,609 shares · 2025Q4
13F
Two Sigma Investments trimmed2026-02-17
−1,000 shares · 2025Q4
13F
Izzy Englander (Millennium Mgmt) added2026-02-17
+193,620 shares · 2025Q4
13F
Steve Cohen (Point72) opened position2026-02-17
+3,600 shares · 2025Q4
13F
Chase Coleman (Tiger Global) trimmed2026-02-17
−986,000 shares · 2025Q4
13F
Ron Baron (Baron Capital / BAMCO) added2026-02-17
+242,533 shares · 2025Q4
13F
T. Rowe Price trimmed2026-02-17
−65,330 shares · 2025Q4
13F
Ray Dalio (Bridgewater Associates) opened position2026-02-13
+9,020 shares · 2025Q4
13F
Chuck Akre (Akre Capital) added2026-02-13
+311,320 shares · 2025Q4
13F
Norges Bank (Norway SWF) opened position2026-02-10
+7,090,495 shares · 2025Q4
13F
Baillie Gifford & Co added2026-01-23
+4,691,543 shares · 2025Q4
13F
Daniel Loeb (Third Point) trimmed2025-11-14
−68,000 shares · 2025Q3
13F
Two Sigma Investments exited2025-11-14
−26,299 shares · 2025Q3
13F
D.E. Shaw & Co. trimmed2025-11-14
−10,900 shares · 2025Q3
13F
AQR Capital Management trimmed2025-11-14
−41,115 shares · 2025Q3
13F
Izzy Englander (Millennium Mgmt) added2025-11-14
+301,038 shares · 2025Q3
13F
Andreas Halvorsen (Viking Global) trimmed2025-11-14
−1,368,839 shares · 2025Q3
13F
T. Rowe Price added2025-11-14
+68,830 shares · 2025Q3
13F
Wellington Management trimmed2025-11-14
−20,442 shares · 2025Q3
13F
Ron Baron (Baron Capital / BAMCO) trimmed2025-11-14
−424,369 shares · 2025Q3
13F
Ray Dalio (Bridgewater Associates) exited2025-11-13
−432,708 shares · 2025Q3
13F
Norges Bank (Norway SWF) exited2025-11-13
−5,308,249 shares · 2025Q3
13F
Chuck Akre (Akre Capital) trimmed2025-11-13
−2,747 shares · 2025Q3
13F
Jeremy Grantham (GMO) exited2025-11-13
−8,373 shares · 2025Q3
13F
Norges Bank (Norway SWF) added2025-11-12
+40,373 shares · 2024Q3
13F

Insider activity

No insider transactions in the last 30 days.

View full insider history for CSGP →

Follow-the-investor returns

If you'd copied each holder of CSGP…

Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
Paul Tudor Jones (Tudor Investment)	2018Q3	$67.59	-40.8%	$5.4M
Paul Tudor Jones (Tudor Investment)	2018Q3	$67.59	-40.8%	$5.4M
Paul Tudor Jones (Tudor Investment)	2018Q3	$67.59	-40.8%	$5.4M
Izzy Englander (Millennium Mgmt)	2016Q1	$69.79	-42.6%	$3.0M
Izzy Englander (Millennium Mgmt)	2016Q1	$69.79	-42.6%	$3.0M
Izzy Englander (Millennium Mgmt)	2016Q1	$69.79	-42.6%	$3.0M
Chase Coleman (Tiger Global)	2024Q4	$71.59	-44.1%	$90.5M
Ray Dalio (Bridgewater Associates)	2020Q4	$71.68	-44.1%	$361K
Two Sigma Investments	2016Q2	$73.38	-45.4%	$120K
Ken Griffin (Citadel Advisors)	2016Q1	$74.20	-46.0%	$3.0M
Ken Griffin (Citadel Advisors)	2016Q1	$74.20	-46.0%	$3.0M
Ken Griffin (Citadel Advisors)	2016Q1	$74.20	-46.0%	$3.0M
Steve Cohen (Point72)	2019Q1	$75.56	-47.0%	$144K
D.E. Shaw & Co.	2016Q1	$78.88	-49.2%	$36.3M
AQR Capital Management	2016Q1	$80.70	-50.4%	$14.8M
Ron Baron (Baron Capital / BAMCO)	2016Q1	$91.36	-56.2%	$780.7M
Andreas Halvorsen (Viking Global)	2020Q3	$94.32	-57.5%	$57.8M
Wellington Management	2016Q1	$96.06	-58.3%	$2.1M
T. Rowe Price	2016Q1	$96.35	-58.4%	$48.0M
Baillie Gifford & Co	2016Q3	$103.95	-61.5%	$517.8M
Wally Weitz (Weitz Investment)	2020Q1	$107.99	-62.9%	$28.8M
Chuck Akre (Akre Capital)	2019Q4	$123.05	-67.5%	$385.1M
Daniel Loeb (Third Point)	2021Q1	$124.88	-67.9%	$126.7M
Norges Bank (Norway SWF)	2016Q1	$1831.51	-97.8%	$283.9M

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.

New positions4

Norges Bank (Norway SWF)
+7,090,495
$476.8M
Paul Tudor Jones (Tudor Investment)
+205,000
$13.8M
Ray Dalio (Bridgewater Associates)
+9,020
$607K
Steve Cohen (Point72)
+3,600
$242K

Added to6

Baillie Gifford & Co
+4,691,543
$315.5M
Chuck Akre (Akre Capital)
+311,320
$20.9M
Ron Baron (Baron Capital / BAMCO)
+242,533
$16.3M
Izzy Englander (Millennium Mgmt)
+193,620
$13.0M
Daniel Loeb (Third Point)
+148,000
$10.0M
AQR Capital Management
+45,609
$3.1M

Trimmed6

Ken Griffin (Citadel Advisors)
−1,122,075
$75.4M
Chase Coleman (Tiger Global)
−986,000
$66.3M
Andreas Halvorsen (Viking Global)
−407,147
$27.4M
Wellington Management
−12,746
$857K
Two Sigma Investments
−1,000
$67K
T. Rowe Price
−65,330
$4K

Exited0

—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	21	104,576,531	$247.29B	—
2022Q2	21	104,281,998	$237.00B	—
2022Q3	19	99,968,517	$272.1M	-2
2022Q4	20	97,530,610	$6.25B	+1
2023Q1	21	93,062,004	$6.11B	+1
2023Q2	19	92,242,917	$7.96B	-2
2023Q3	18	88,322,949	$6.67B	-1
2023Q4	18	86,552,860	$7.43B	—
2024Q1	19	91,963,148	$8.73B	+1
2024Q2	24	86,312,378	$6.29B	+5
2024Q3	23	47,842,465	$3.51B	-1
2024Q4	21	52,579,558	$3.67B	-2
2025Q1	20	47,315,114	$3.67B	-1
2025Q2	23	56,900,639	$4.48B	+3
2025Q3	18	51,018,894	$4.20B	-5
2025Q4	24	61,389,401	$4.05B	+6

Congress members trading this stock

Date	Member	Type	Amount range	Filing
2026-03-13	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2026-01-28	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2025-12-10	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2025-10-15	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2025-09-30	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2025-09-25	Lisa McClain	Sell	$1K – $15K	PDF ↗
2025-09-22	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2025-08-13	Lisa McClain	Buy	$1K – $15K	PDF ↗
2025-07-31	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2025-07-09	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2025-06-30	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗
2025-06-25	Gilbert Cisneros	Buy	$1K – $15K	PDF ↗

Who owns CSGP

24 super-investors · 2025Q4

Tracked stake

61.39M

Combined value

$4.05B

% of shares outstanding

—

shares-out unknown

Quarter action mix

New6Added8Trim8Held2

#	Manager	Shares	Value	% of book	Last action
1	Ron Baron Baron Capital / BAMCO	19.50M	$1.31B	3.6%	Added+242.5K
2	Baillie Gifford & Co	12.93M	$870M	0.7%	Added+4.69M
3	Chuck Akre Akre Capital	9.62M	$647M	7.1%	Added+311.3K
4	Norges Bank Norway SWF	7.09M	$477M	0.1%	New+7.09M
5	Daniel Loeb Third Point	3.17M	$213M	2.9%	Added+148.0K
6	Chase Coleman Tiger Global	2.26M	$152M	0.5%	Trim−986.0K
7	Andreas Halvorsen Viking Global	1.44M	$97M	0.3%	Trim−407.1K
8	D.E. Shaw & Co.	905.5K	$61M	0.0%	Held
9	Wally Weitz Weitz Investment	719.9K	$48M	2.9%	Held
10	Ken Griffin Citadel Advisors	604.5K	$41M	0.0%	Trim−1.12M
11	Izzy Englander Millennium Mgmt	602.0K	$40M	0.0%	Added+193.6K
12	AQR Capital Management	369.4K	$25M	0.0%	Added+45.6K
13	Ken Griffin Citadel Advisors	246.0K	$17M	0.0%	Trim−1.12M
14	Paul Tudor Jones Tudor Investment	205.0K	$14M	0.0%	New+205.0K
15	Paul Tudor Jones Tudor Investment	135.0K	$9M	0.0%	New+205.0K
16	Izzy Englander Millennium Mgmt	123.1K	$8M	0.0%	Added+193.6K
17	Ken Griffin Citadel Advisors	74.7K	$5M	0.0%	Trim−1.12M
18	Izzy Englander Millennium Mgmt	74.7K	$5M	0.0%	Added+193.6K
19	Paul Tudor Jones Tudor Investment	55.3K	$4M	0.0%	New+205.0K
20	Wellington Management	53.7K	$4M	0.0%	Trim−12.7K
21	Ray Dalio Bridgewater Associates	9.0K	$607K	0.0%	New+9.0K
22	Steve Cohen Point72	3.6K	$242K	0.0%	New+3.6K
23	Two Sigma Investments	3.0K	$202K	0.0%	Trim−1.0K
24	T. Rowe Price	1.20M	$81K	0.0%	Trim−65.3K

Recent moves

20 transactions

TRIMTwo Sigma Investments
−1,000 · 2025Q4
TRIMWellington Management
−12,746 · 2025Q4
NEWSteve Cohen (Point72)
+3,600 · 2025Q4
ADDRon Baron (Baron Capital / BAMCO)
+242,533 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+205,000 · 2025Q4
ADDAQR Capital Management
+45,609 · 2025Q4
ADDIzzy Englander (Millennium Mgmt)
+193,620 · 2025Q4
TRIMKen Griffin (Citadel Advisors)
−1,122,075 · 2025Q4
TRIMAndreas Halvorsen (Viking Global)
−407,147 · 2025Q4
TRIMChase Coleman (Tiger Global)
−986,000 · 2025Q4
ADDDaniel Loeb (Third Point)
+148,000 · 2025Q4
TRIMT. Rowe Price
−65,330 · 2025Q4
NEWRay Dalio (Bridgewater Associates)
+9,020 · 2025Q4
ADDChuck Akre (Akre Capital)
+311,320 · 2025Q4
NEWNorges Bank (Norway SWF)
+7,090,495 · 2025Q4
ADDBaillie Gifford & Co
+4,691,543 · 2025Q4
ADDIzzy Englander (Millennium Mgmt)
+301,038 · 2025Q3
TRIMDaniel Loeb (Third Point)
−68,000 · 2025Q3
SOLDTwo Sigma Investments
−26,299 · 2025Q3
TRIMD.E. Shaw & Co.
−10,900 · 2025Q3

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