CSGP in the 13F filings

Costar Group Inc · CUSIP 22160N109

Quarter

Q3 2026 · early filers Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024 Q1 2024 Q4 2023

Quarter end: 31 Mar 2026; the date the book describes
Filed: 27 Oct 2026; latest of these filings; the earliest 8 May 2026
Managers listing it: 35; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q4 2025 and Q1 2026; 10 listed it in both
Shares listed: 85,791,042; combined, among listed positions
Reported value: $3.5bn; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 23 buyers (opened or added shares) and 18 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +12,280,483.

Managers listing CSGP in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

35 of 35 holders

				Action		Filing
Invesco Ltd	15,947,525	$643m	0.06%	Added	+1,038,784	12 May 2026 (the filing on sec.gov)
Baillie Gifford & Co	13,610,922	$549m	0.56%	Added	+677,737	8 May 2026 (the filing on sec.gov)
Polen Capital Management LLC	12,570,368	$507m	3.51%	Added	+7,679,432	14 May 2026 (the filing on sec.gov)
Akre Capital Management LLC	10,348,273	$417m	6.80%	Added	+730,468	14 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd	7,724,152	$312m	0.15%	Added	+250,772	18 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.	5,909,623	$238m	0.14%	Added	+5,004,135	15 May 2026 (the filing on sec.gov)
Capital Research Global Investors	4,373,706	$176m	under 0.1%	Trimmed	-1,193,256	13 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)	2,831,524	$114m	under 0.1%	Added	+1,629,371	15 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	1,517,795	$61m	under 0.1%	Added	+318,963	15 May 2026 (the filing on sec.gov)
Tiger Global Management LLC	1,500,000	$61m	0.26%	Trimmed	-759,109	15 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC	1,329,958	$54m	0.21%	New	new	15 May 2026 (the filing on sec.gov)
AQR Capital Management LLC	1,262,704	$51m	under 0.1%	Added	+893,352	15 May 2026 (the filing on sec.gov)
Citadel Advisors LLC	1,088,204	$44m	under 0.1%	Added	+483,661	15 May 2026 (the filing on sec.gov)
Jane Street Group LLC	1,087,447	$44m	under 0.1%	Added	+850,071	12 May 2026 (the filing on sec.gov)
MFS Investment Management	956,096	$39m	under 0.1%	Trimmed	-2,203,829	14 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC	782,607	$32m	under 0.1%	Trimmed	-12,956	15 May 2026 (the filing on sec.gov)
AllianceBernstein LP	407,508	$27m	under 0.1%	Trimmed	-14,665	15 May 2026 (the filing on sec.gov)
Walleye Capital LLC	536,787	$22m	0.09%	Added	+504,325	13 May 2026 (the filing on sec.gov)
Marshall Wace LLP	517,260	$21m	under 0.1%	Added	+125,955	15 May 2026 (the filing on sec.gov)
Two Sigma Investments LP	303,004	$12m	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP	254,329	$10m	under 0.1%	Added	+59,645	15 May 2026 (the filing on sec.gov)
Tudor Investment Corp	179,283	$7.2m	under 0.1%	Trimmed	-25,717	15 May 2026 (the filing on sec.gov)
Millennium Management LLC	123,590	$5.0m	under 0.1%	Trimmed	-478,385	15 May 2026 (the filing on sec.gov)
Winton Group Ltd	101,423	$4.1m	0.14%	New	new	12 May 2026 (the filing on sec.gov)
Holocene Advisors LP	92,988	$3.8m	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)

Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Polen Capital Management LLCexisting position · 12,570,368 shares now+7,679,432
D. E. Shaw & Co.existing position · 5,909,623 shares now+5,004,135
Fidelity (FMR LLC)existing position · 2,831,524 shares now+1,629,371
Voloridge Investment Management LLCnew position · 1,329,958 shares now+1,329,958
Invesco Ltdexisting position · 15,947,525 shares now+1,038,784

Reductions

MFS Investment Managementexisting position · 956,096 shares now-2,203,829
Capital Research Global Investorsexisting position · 4,373,706 shares now-1,193,256
Tiger Global Management LLCexisting position · 1,500,000 shares now-759,109
Millennium Management LLCexisting position · 123,590 shares now-478,385
Man Group PLCexisting position · 64,729 shares now-160,524

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (8)

Voloridge Investment Management LLC$54m
Two Sigma Investments LP$12m
Winton Group Ltd$4.1m
Holocene Advisors LP$3.8m
Caxton Associates LLP$3.4m
Arrowstreet Capital LP$1.6m
Quantbot Technologies LP$446k
Brevan Howard Capital Management LP$383k

Exited (6)

Third Point LLCwas $213m
Viking Global Investors LPwas $97m
Freestone Grove Partners LPwas $14m
Schonfeld Strategic Advisors LLCwas $2.6m
Verition Fund Management LLCwas $1.1m
Bridgewater Associates LPwas $607k

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

13 in Q3 2024 to 15 in Q2 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

CSGP by quarter
Quarter	Holders	Reported value	Buyers	Sellers
Q2 2013	6	$486m	n.a.	n.a.
Q3 2013	6	$610m	n.a.	n.a.
Q4 2013	7	$827m	n.a.	n.a.
Q1 2014	11	$885m	n.a.	n.a.
Q2 2014	8	$740m	n.a.	n.a.
Q3 2014	7	$618m	n.a.	n.a.
Q4 2014	8	$815m	n.a.	n.a.
Q1 2015	9	$1.2bn	n.a.	n.a.
Q2 2015	8	$1.2bn	n.a.	n.a.
Q3 2015	7	$1.1bn	n.a.	n.a.
Q4 2015	8	$1.3bn	n.a.	n.a.
Q1 2016	10	$1.1bn	n.a.	n.a.
Q2 2016	9	$1.1bn	n.a.	n.a.
Q3 2016	10	$1.1bn	n.a.	n.a.
Q4 2016	9	$827m	n.a.	n.a.
Q1 2017	8	$1.1bn	n.a.	n.a.
Q2 2017	13	$2.3bn	n.a.	n.a.
Q3 2017	15	$2.8bn	n.a.	n.a.
Q4 2017	16	$3.2bn	n.a.	n.a.
Q1 2018	14	$3.7bn	n.a.	n.a.
Q2 2018	13	$3.9bn	n.a.	n.a.
Q3 2018	19	$4.0bn	n.a.	n.a.
Q4 2018	16	$2.8bn	n.a.	n.a.
Q1 2019	18	$3.7bn	n.a.	n.a.
Q2 2019	17	$4.3bn	n.a.	n.a.
Q3 2019	26	$4.9bn	n.a.	n.a.
Q4 2019	19	$5.0bn	n.a.	n.a.
Q1 2020	20	$5.4bn	n.a.	n.a.
Q2 2020	18	$7.4bn	n.a.	n.a.
Q3 2020	20	$8.8bn	n.a.	n.a.
Q4 2020	21	$9.3bn	n.a.	n.a.
Q1 2021	19	$8.6bn	n.a.	n.a.
Q2 2021	21	$8.4bn	n.a.	n.a.
Q3 2021	15	$8.4bn	n.a.	n.a.
Q4 2021	19	$6.9bn	n.a.	n.a.
Q1 2022	18	$5.0bn	n.a.	n.a.
Q2 2022	23	$5.0bn	n.a.	n.a.
Q3 2022	20	$5.0bn	n.a.	n.a.
Q4 2022	22	$5.3bn	n.a.	n.a.
Q1 2023	19	$4.3bn	n.a.	n.a.
Q2 2023	15	$5.5bn	n.a.	n.a.
Q3 2023	16	$4.6bn	n.a.	n.a.
Q4 2023	13	$5.1bn	6	7
Q1 2024	13	$5.7bn	6	6
Q2 2024	15	$4.1bn	12	3
Q3 2024	13	$3.8bn	8	4
Q4 2024	15	$3.3bn	10	5
Q1 2025	16	$3.8bn	11	4
Q2 2025	16	$4.5bn	9	7
Q3 2025	14	$4.8bn	6	9
Q4 2025	13	$4.5bn	20	14
Q1 2026	14	$3.0bn	23	18
Q2 2026	15	$1.8bn	26	12

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

CSGP and V →CSGP and MA →CSGP and MCO →Choose a stock to compare with CSGP →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own CSGP, latest filings →Back to the 13F Explorer →

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