CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DIESES SYMBOL IST NICHT MEHR AKTIV
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionAPG Asset Management N.V.
Latest Disclosed Ownership210,304 shares
Latest Disclosed Value $ 7,363,013
APG Asset Management N.V. reports 3.69% decrease in ownership of CSGP / CoStar Group, Inc.

On May 13, 2026 - APG Asset Management N.V. filed a 13F-HR form disclosing ownership of 210,304 shares of CoStar Group, Inc. (MX:CSGP) valued at $7,363,013 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 218,356 shares of CoStar Group, Inc.. This represents a change in shares of -3.69% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F COSTAR GROUP COM 22160N109 210,304 -8,052 -3.69 7,363 -41.10 0.0233
2026-02-12 2025-12-31 13F COSTAR GROUP COM 22160N109 218,356 -16,344 -6.96 12,501 -25.82 0.0355
2025-11-12 2025-09-30 13F COSTAR GROUP COM 22160N109 234,700 6,200 2.71 16,852 7.68 0.0473
2025-08-12 2025-06-30 13F COSTAR GROUP COM 22160N109 228,500 7,600 3.44 15,651 -3.41 0.0463
2025-05-14 2025-03-31 13F COSTAR GROUP COM 22160N109 220,900 3,400 1.56 16,202 7.75 0.0503
2025-02-13 2024-12-31 13F COSTAR GROUP COM 22160N109 217,500 217,500 15,037 0.0419
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 0 -46,129 -100.00 0 -100.00
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 46,129 30,100 187.78 3,191 122.68 0.0057
2024-05-14 2024-03-31 13F COSTAR GROUP COM 22160N109 16,029 1,000 6.65 1,434 20.62 0.0025
2024-02-13 2023-12-31 13F COSTAR GROUP COM 22160N109 15,029 -401 -2.60 1,189 0.17 0.0023
2023-11-14 2023-09-30 13F COSTAR GROUP COM 22160N109 15,430 -733,710 -97.94 1,186 -98.06 0.0024
2023-08-14 2023-06-30 13F COSTAR GROUP COM 22160N109 749,140 -15,517 -2.03 61,112 26.12 0.1233
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 764,657 57,858 8.19 48,457 89,635.19 0.1028
2023-02-14 2022-12-31 13F COSTAR GROUP COM 22160N109 706,799 95,015 15.53 55 -99.88 0.1038
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 611,784 -39,352 -6.04 43,496 15.60 0.1122
2022-08-12 2022-06-30 13F COSTAR GROUP COM 22160N109 651,136 -130,771 -16.72 37,625 -19.62 0.0882
2022-05-12 2022-03-31 13F COSTAR GROUP COM 22160N109 781,907 -630,086 -44.62 46,810 -52.30 0.0885
2022-02-11 2021-12-31 13F COSTAR GROUP COM 22160N109 1,411,993 -58,091 -3.95 98,127 -10.11 0.1667
2021-11-15 2021-09-30 13F/A-1 COSTAR GROUP COM 22160N109 1,470,084 -72,886 -4.72 109,164 1.31 0.1940
2021-11-15 2021-09-30 13F COSTAR GROUP COM 22160N109 1,470,084 -72,886 109,164 0.1962
2021-08-13 2021-06-30 13F COSTAR GROUP COM 22160N109 1,542,970 1,383,519 867.68 107,757 -3.36 0.1830
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 159,451 42,610 36.47 111,504 26.33 0.1903
2021-02-12 2020-12-31 13F COSTAR GROUP COM 22160N109 116,841 -6,855 -5.54 88,263 -1.39 0.1440
2020-11-12 2020-09-30 13F COSTAR GROUP COM 22160N109 123,696 3,900 3.26 89,504 18.08 0.1549
2020-08-14 2020-06-30 13F COSTAR GROUP COM 22160N109 119,796 30,734 34.51 75,801 44.94 0.1382
2020-05-19 2020-03-31 13F/A-2 COSTAR GROUP COM 22160N109 89,062 34,677 63.76 52,298 80.41 0.1025
2020-05-15 2020-03-31 13F/A-1 COSTAR GROUP COM 22160N109 89,062 0 52,298 0.1036
2020-05-14 2020-03-31 13F COSTAR GROUP COM 22160N109 52,888 -1,497 21,969 41,103.1733
2020-02-13 2019-12-31 13F COSTAR GROUP COM 22160N109 54,385 0 0.00 28,988 -2.04 0.0471
2019-11-08 2019-09-30 13F COSTAR GROUP COM 22160N109 54,385 197 0.36 29,592 12.24 0.0487
2019-08-13 2019-06-30 13F COSTAR GROUP COM 22160N109 54,188 1,300 2.46 26,364 20.01 0.0452
2019-05-14 2019-03-31 13F COSTAR GROUP COM 22160N109 52,888 -1,612 -2.96 21,969 36.60 0.0403
2019-02-19 2018-12-31 13F/A-1 COSTAR GROUP COM 22160N109 54,500 46,200 556.63 16,083 434.85 0.0327
2019-02-13 2018-12-31 13F COSTAR GROUP COM 22160N109 54,500 46,200 16,083
2018-11-09 2018-09-30 13F COSTAR GROUP COM 22160N109 8,300 0 0.00 3,007 2.52 0.0053
2018-08-13 2018-06-30 13F COSTAR GROUP COM 22160N109 8,300 5,100 159.38 2,933 210.70 0.0054
2018-05-14 2018-03-31 13F COSTAR GROUP COM 22160N109 3,200 0 0.00 944 19.34 0.0018
2018-02-21 2017-12-31 13F/A-1 COSTAR GROUP COM 22160N109 3,200 0 0.00 791 -7.81 0.0014
2018-01-24 2017-12-31 13F COSTAR GROUP COM 22160N109 3,200 0 791
2017-10-19 2017-09-30 13F COSTAR GROUP COM 22160N109 3,200 3,200 858 0.0014
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.