CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionNight Owl Capital Management, LLC
Latest Disclosed Ownership109,244 shares
Latest Disclosed Value $ 4,406,891
Night Owl Capital Management, LLC reports 0.58% increase in ownership of CSGP / CoStar Group, Inc.

On May 15, 2026 - Night Owl Capital Management, LLC filed a 13F-HR form disclosing ownership of 109,244 shares of CoStar Group, Inc. (MX:CSGP) valued at $4,406,891 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 108,615 shares of CoStar Group, Inc.. This represents a change in shares of 0.58% 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 INC COM COM 22160N109 109,244 629 0.58 4,407 -39.67 0.5136
2026-02-13 2025-12-31 13F COSTAR GROUP INC COM COM 22160N109 108,615 904 0.84 7,303 -19.63 0.8004
2025-11-14 2025-09-30 13F COSTAR GROUP INC COM COM 22160N109 107,711 818 0.77 9,088 5.74 0.9907
2025-08-14 2025-06-30 13F COSTAR GROUP INC COM COM 22160N109 106,893 3,052 2.94 8,594 4.46 0.9938
2025-05-15 2025-03-31 13F COSTAR GROUP INC COM COM 22160N109 103,841 2,192 2.16 8,227 13.05 1.0285
2025-02-14 2024-12-31 13F COSTAR GROUP INC COM COM 22160N109 101,649 2,747 2.78 7,277 -2.47 0.9400
2024-11-14 2024-09-30 13F COSTAR GROUP INC COM COM 22160N109 98,902 1,460 1.50 7,461 3.28 1.0204
2024-08-14 2024-06-30 13F COSTAR GROUP INC COM COM 22160N109 97,442 -1,308 -1.32 7,224 -24.27 1.0809
2024-05-15 2024-03-31 13F COSTAR GROUP INC COM COM 22160N109 98,750 4,249 4.50 9,539 31.28 1.4482
2024-06-14 2023-12-31 13F/A-1 COSTAR GROUP INC COM COM 22160N109 94,501 0 0.00 7,266 0.00 1.8196
2024-02-14 2023-12-31 13F COSTAR GROUP INC COM COM 22160N109 98,746 4,245 8,629 1.7257
2024-06-14 2023-09-30 13F/A-1 COSTAR GROUP INC COM COM 22160N109 94,501 -88 -0.09 7,266 -13.68 1.8196
2023-11-14 2023-09-30 13F COSTAR GROUP INC COM COM 22160N109 95,657 1,068 7,355 1.8248
2024-06-14 2023-06-30 13F/A-1 COSTAR GROUP INC COM COM 22160N109 94,589 -2,254 -2.33 8,418 26.26 2.1770
2023-08-14 2023-06-30 13F COSTAR GROUP INC COM COM 22160N109 96,042 -801 8,548 2.1821
2024-06-14 2023-03-31 13F/A-1 COSTAR GROUP INC COM COM 22160N109 96,843 -159 -0.16 6,668 -11.06 2.4098
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 98,896 1,894 6,809 2.4080
2024-06-14 2022-12-31 13F/A-1 COSTAR GROUP INC COM COM 22160N109 97,002 -182,198 -65.26 7,496 -61.45 3.4866
2023-02-14 2022-12-31 13F COSTAR GROUP COM 22160N109 96,747 -182,453 7,477 3.4964
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 279,200 12,951 4.86 19,446 20.90 8.0970
2022-08-12 2022-06-30 13F COSTAR GROUP COM 22160N109 266,249 -15,576 -5.53 16,084 -14.32 6.1736
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 281,825 32,942 13.24 18,772 -4.56 5.3311
2022-02-14 2021-12-31 13F COSTAR GROUP COM 22160N109 248,883 147,760 146.12 19,669 126.00 3.9986
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 101,123 2,203 2.23 8,703 6.22 1.5273
2021-08-13 2021-06-30 13F COSTAR GROUP COM 22160N109 98,920 88,968 893.97 8,193 0.17 1.6175
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 9,952 946 10.50 8,179 -1.74 1.6644
2021-02-12 2020-12-31 13F COSTAR GROUP COM 22160N109 9,006 227 2.59 8,324 11.75 1.6022
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 8,779 541 6.57 7,449 27.25 1.5507
2020-08-14 2020-06-30 13F COSTAR GROUP COM 22160N109 8,238 12 0.15 5,854 21.20 1.3954
2020-05-15 2020-03-31 13F COSTAR GROUP COM 22160N109 8,226 -103 -1.24 4,830 -3.07 1.6136
2020-02-14 2019-12-31 13F COSTAR GROUP COM 22160N109 8,329 101 1.23 4,983 2.09 1.4332
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 8,228 -56 -0.68 4,881 6.34 1.5507
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 8,284 -135 -1.60 4,590 16.88 1.4045
2019-05-14 2019-03-31 13F COSTAR GROUP COM 22160N109 8,419 -8,563 -50.42 3,927 -31.45 1.4055
2019-02-14 2018-12-31 13F COSTAR GROUP COM 22160N109 16,982 -5,988 -26.07 5,729 -40.74 2.4525
2018-11-15 2018-09-30 13F COSTAR GROUP COM 22160N109 22,970 37 0.16 9,667 2.16 3.4274
2018-08-14 2018-06-30 13F COSTAR GROUP COM 22160N109 22,933 9 0.04 9,463 13.82 3.4642
2018-05-15 2018-03-31 13F COSTAR GROUP COM 22160N109 22,924 79 0.35 8,314 22.55 3.4791
2018-02-14 2017-12-31 13F COSTAR GROUP COM 22160N109 22,845 96 0.42 6,784 11.18 3.1606
2017-11-14 2017-09-30 13F COSTAR GROUP COM 22160N109 22,749 -276 -1.20 6,102 0.54 2.9487
2017-08-14 2017-06-30 13F COSTAR GROUP COM 22160N109 23,025 -426 -1.82 6,069 24.88 3.1743
2017-05-15 2017-03-31 13F COSTAR GROUP COM 22160N109 23,451 -715 -2.96 4,860 6.70 2.5592
2017-02-14 2016-12-31 13F COSTAR GROUP COM 22160N109 24,166 24,166 4,555 2.6775
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.