CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionAmerican Century Companies Inc
Latest Disclosed Ownership61,958 shares
Latest Disclosed Value $ 2,499,386
American Century Companies Inc reports 19.11% decrease in ownership of CSGP / CoStar Group, Inc.

On May 15, 2026 - American Century Companies Inc filed a 13F-HR form disclosing ownership of 61,958 shares of CoStar Group, Inc. (MX:CSGP) valued at $2,499,386 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 76,595 shares of CoStar Group, Inc.. This represents a change in shares of -19.11% 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)
2026-05-15 2026-03-31 13F COSTAR GROUP COM 22160N109 61,958 -14,637 -19.11 2,499 -51.48 0.0013
2026-02-13 2025-12-31 13F COSTAR GROUP COM 22160N109 76,595 -474,928 -86.11 5,150 -88.93 0.0026
2025-11-12 2025-09-30 13F COSTAR GROUP COM 22160N109 551,523 481,024 682.31 46,532 720.94 0.0237
2025-08-12 2025-06-30 13F COSTAR GROUP COM 22160N109 70,499 2,276 3.34 5,668 4.87 0.0031
2025-05-13 2025-03-31 13F COSTAR GROUP COM 22160N109 68,223 6,873 11.20 5,405 23.06 0.0033
2025-02-11 2024-12-31 13F COSTAR GROUP COM 22160N109 61,350 2,041 3.44 4,392 -1.83 0.0025
2024-11-12 2024-09-30 13F COSTAR GROUP COM 22160N109 59,309 -1,041,212 -94.61 4,474 -94.52 0.0026
2024-08-07 2024-06-30 13F COSTAR GROUP COM 22160N109 1,100,521 -912,955 -45.34 81,593 -58.05 0.0499
2024-05-14 2024-03-31 13F COSTAR GROUP COM 22160N109 2,013,476 -363,836 -15.30 194,502 -6.38 0.1222
2024-02-13 2023-12-31 13F COSTAR GROUP COM 22160N109 2,377,312 -251,048 -9.55 207,753 2.80 0.1428
2023-11-13 2023-09-30 13F COSTAR GROUP COM 22160N109 2,628,360 -307,020 -10.46 202,095 -22.64 0.1580
2023-08-14 2023-06-30 13F COSTAR GROUP COM 22160N109 2,935,380 -470,362 -13.81 261,249 12.03 0.1970
2023-05-11 2023-03-31 13F COSTAR GROUP COM 22160N109 3,405,742 -708,387 -17.22 233,187 -26.66 0.1837
2023-02-13 2022-12-31 13F COSTAR GROUP COM 22160N109 4,114,129 -119,877 -2.83 317,940 7.81 0.2598
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 4,234,006 -788,646 -15.70 294,899 -2.81 0.2595
2022-08-12 2022-06-30 13F COSTAR GROUP COM 22160N109 5,022,652 2,203,264 78.15 303,419 61.57 0.2482
2022-05-11 2022-03-31 13F COSTAR GROUP COM 22160N109 2,819,388 1,915,752 212.00 187,799 162.97 0.1284
2022-02-07 2021-12-31 13F COSTAR GROUP COM 22160N109 903,636 -569 -0.06 71,414 -8.23 0.0453
2021-11-10 2021-09-30 13F COSTAR GROUP COM 22160N109 904,205 -18,164 -1.97 77,816 1.87 0.0533
2021-08-05 2021-06-30 13F COSTAR GROUP COM 22160N109 922,369 845,205 1,095.34 76,391 20.45 0.0521
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 77,164 -179,248 -69.91 63,420 -73.24 0.0466
2021-02-12 2020-12-31 13F COSTAR GROUP COM 22160N109 256,412 -121,098 -32.08 236,996 -26.01 0.1847
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 377,510 61,619 19.51 320,321 42.69 0.2841
2020-08-13 2020-06-30 13F COSTAR GROUP COM 22160N109 315,891 55,908 21.50 224,494 47.05 0.2128
2020-05-14 2020-03-31 13F COSTAR GROUP COM 22160N109 259,983 -98,017 -27.38 152,665 -28.72 0.1819
2020-02-12 2019-12-31 13F COSTAR GROUP COM 22160N109 358,000 -43,496 -10.83 214,191 -10.07 0.2039
2019-11-13 2019-09-30 13F COSTAR GROUP COM 22160N109 401,496 -125,727 -23.85 238,167 -18.47 0.2390
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 527,223 27,599 5.52 292,113 25.35 0.2907
2019-05-14 2019-03-31 13F COSTAR GROUP COM 22160N109 499,624 18,206 3.78 233,035 43.49 0.2361
2019-02-12 2018-12-31 13F COSTAR GROUP COM 22160N109 481,418 266,965 124.49 162,402 79.95 0.1855
2018-11-02 2018-09-30 13F COSTAR GROUP COM 22160N109 214,453 485 0.23 90,250 2.22 0.0880
2018-08-08 2018-06-30 13F COSTAR GROUP COM 22160N109 213,968 213,968 88,290 0.0889
2018-02-02 2017-12-31 13F COSTAR GROUP COM 22160N109 0 -5,838 -100.00 0 -100.00
2017-11-01 2017-09-30 13F COSTAR GROUP COM 22160N109 5,838 -200,439 -97.17 1,566 -97.12 0.0016
2017-08-07 2017-06-30 13F COSTAR GROUP COM 22160N109 206,277 -103,417 -33.39 54,375 -15.27 0.0562
2017-05-02 2017-03-31 13F COSTAR GROUP COM 22160N109 309,694 -18,231 -5.56 64,175 3.82 0.0666
2017-02-03 2016-12-31 13F COSTAR GROUP COM 22160N109 327,925 -181,123 -35.58 61,811 -43.92 0.0666
2016-11-01 2016-09-30 13F COSTAR GROUP COM 22160N109 509,048 -105,405 -17.15 110,224 -17.96 0.1211
2016-08-16 2016-06-30 13F/A-1 COSTAR GROUP COM 22160N109 614,453 -8,003 -1.29 134,356 14.71 0.1528
2016-07-26 2016-06-30 13F COSTAR GROUP COM 22160N109 614,453 134,356
2016-05-02 2016-03-31 13F COSTAR GROUP COM 22160N109 622,456 -23,073 -3.57 117,128 -12.21 0.1367
2016-02-01 2015-12-31 13F COSTAR GROUP COM 22160N109 645,529 17,237 2.74 133,424 22.71 0.1563
2015-11-02 2015-09-30 13F COSTAR GROUP COM 22160N109 628,292 -66,101 -9.52 108,732 -22.20 0.1327
2015-07-28 2015-06-30 13F COSTAR GROUP COM 22160N109 694,393 -71,663 -9.35 139,754 -7.78 0.1572
2015-05-06 2015-03-31 13F COSTAR GROUP COM 22160N109 766,056 766,056 0.00 151,549 0.1692
2015-01-27 2014-12-31 13F COSTAR GROUP COM 22160N109 0 -874,689 -100.00 0 -100.00
2014-11-07 2014-09-30 13F COSTAR GROUP COM 22160N109 874,689 -84,789 -8.84 136,049 -10.35 0.1588
2014-08-04 2014-06-30 13F COSTAR GROUP COM 22160N109 959,478 204,548 27.09 151,761 7.65 0.1731
2014-05-05 2014-03-31 13F COSTAR GROUP COM 22160N109 754,930 341,962 82.81 140,976 84.94 0.1666
2014-02-06 2013-12-31 13F COSTAR GROUP COM 22160N109 412,968 273,433 195.96 76,226 225.36 0.0898
2013-10-30 2013-09-30 13F COSTAR GROUP COM 22160N109 139,535 108,670 352.08 23,428 488.05 0.0294
2013-07-23 2013-06-30 13F COSTAR GROUP COM 22160N109 30,865 30,865 3,984 0.0053
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.