CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionGeneva Capital Management Llc
Latest Disclosed Ownership437,462 shares
Latest Disclosed Value $ 17,647,226
Geneva Capital Management Llc reports 2.96% decrease in ownership of CSGP / CoStar Group, Inc.

On May 6, 2026 - Geneva Capital Management Llc filed a 13F-HR form disclosing ownership of 437,462 shares of CoStar Group, Inc. (MX:CSGP) valued at $17,647,226 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 450,799 shares of CoStar Group, Inc.. This represents a change in shares of -2.96% 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)
2026-05-06 2026-03-31 13F Costar Group COMMON-STOCK 22160N109 437,462 -13,337 -2.96 17,647 -41.78 0.1937
2026-02-12 2025-12-31 13F Costar Group COMMON-STOCK 22160N109 450,799 14,790 3.39 30,312 -17.60 0.5694
2025-11-13 2025-09-30 13F Costar Group COMMON-STOCK 22160N109 436,009 -11,640 -2.60 36,786 2.21 0.6309
2025-08-05 2025-06-30 13F Costar Group COMMON-STOCK 22160N109 447,649 44,444 11.02 35,991 12.66 0.6027
2025-05-09 2025-03-31 13F Costar Group COMMON-STOCK 22160N109 403,205 12,534 3.21 31,946 14.22 0.5967
2025-02-06 2024-12-31 13F Costar Group COMMON-STOCK 22160N109 390,671 -30,029 -7.14 27,968 -11.88 0.4851
2024-11-05 2024-09-30 13F Costar Group COMMON-STOCK 22160N109 420,700 11,562 2.83 31,738 4.63 0.5299
2024-08-14 2024-06-30 13F Costar Group COMMON-STOCK 22160N109 409,138 11,657 2.93 30,333 -21.00 0.5524
2024-05-03 2024-03-31 13F COSTAR GROUP COM 22160N109 397,481 -61,536 -13.41 38,397 -4.28 0.6752
2024-02-07 2023-12-31 13F COSTAR GROUP COM 22160N109 459,017 -2,788 -0.60 40,113 12.97 0.7575
2023-11-13 2023-09-30 13F COSTAR GROUP COM 22160N109 461,805 -19,980 -4.15 35,508 -17.19 0.7483
2023-08-01 2023-06-30 13F COSTAR GROUP COM 22160N109 481,785 -26,602 -5.23 42,879 22.50 0.8455
2023-05-15 2023-03-31 13F COSTAR GROUP COM 22160N109 508,387 24,939 5.16 35,002 -6.31 0.7132
2023-02-07 2022-12-31 13F COSTAR GROUP COM 22160N109 483,448 -18,671 -3.72 37,361 6.83 0.8393
2022-11-02 2022-09-30 13F COSTAR GROUP COM 22160N109 502,119 -7,929 -1.55 34,973 13.50 0.8078
2022-08-02 2022-06-30 13F COSTAR GROUP INC COM COM 22160N109 510,048 -4,209 -0.82 30,812 -10.05 0.7091
2022-05-02 2022-03-31 13F COSTAR GROUP INC COM COM 22160N109 514,257 -9,052 -1.73 34,255 -17.17 0.6618
2022-02-02 2021-12-31 13F COSTAR GROUP INC COM COM 22160N109 523,309 -18,528 -3.42 41,357 -11.31 0.6667
2021-11-08 2021-09-30 13F COSTAR GROUP INC COM COM 22160N109 541,837 -31,751 -5.54 46,630 -1.84 0.7898
2021-08-11 2021-06-30 13F COSTAR GROUP INC COM COM 22160N109 573,588 514,391 868.95 47,505 -2.36 0.7738
2021-05-03 2021-03-31 13F COSTAR GROUP INC COM COM 22160N109 59,197 -2,770 -4.47 48,653 -15.05 0.8304
2021-02-02 2020-12-31 13F COSTAR GROUP INC COM COM 22160N109 61,967 -16,642 -21.17 57,274 -14.13 0.9704
2020-11-12 2020-09-30 13F COSTAR GROUP INC COM COM 22160N109 78,609 -10,113 -11.40 66,701 5.79 1.3759
2020-08-13 2020-06-30 13F COSTAR GROUP INC COM COM 22160N109 88,722 -2,074 -2.28 63,052 18.26 1.3647
2020-05-15 2020-03-31 13F COSTAR GROUP INC COM COM 22160N109 90,796 -134,384 -59.68 53,316 52.22 1.5162
2014-11-14 2014-09-30 13F COSTAR GROUP INC COM COM 22160N109 225,180 -54,128 -19.38 35,025 -20.72 1.0243
2014-08-15 2014-06-30 13F COSTAR GROUP INC COM COM 22160N109 279,308 -16,644 -5.62 44,179 -20.06 1.0839
2014-05-12 2014-03-31 13F COSTAR GROUP INC COM COM 22160N109 295,952 -6,294 -2.08 55,267 -0.94 1.2906
2014-02-11 2013-12-31 13F COSTAR GROUP INC COM COM 22160N109 302,246 -4,125 -1.35 55,789 8.45 1.2640
2013-11-14 2013-09-30 13F COSTAR GROUP INC COM COM 22160N109 306,371 95,442 45.25 51,444 88.96 1.2220
2013-08-13 2013-06-30 13F COSTAR GROUP INC COM COM 22160N109 210,929 210,929 27,225 0.5446
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.