CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionAkre Capital Management Llc
Latest Disclosed Ownership10,348,273 shares
Latest Disclosed Value $ 417,449,333
Akre Capital Management Llc reports 7.59% increase in ownership of CSGP / CoStar Group, Inc.

On May 14, 2026 - Akre Capital Management Llc filed a 13F-HR form disclosing ownership of 10,348,273 shares of CoStar Group, Inc. (MX:CSGP) valued at $417,449,333 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 9,617,805 shares of CoStar Group, Inc.. This represents a change in shares of 7.59% 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)
2026-05-14 2026-03-31 13F COSTAR GROUP COM 22160N109 10,348,273 730,468 7.59 417,449 -35.45 6.8049
2026-02-13 2025-12-31 13F COSTAR GROUP COM 22160N109 9,617,805 311,320 3.35 646,701 -17.64 7.0904
2025-11-13 2025-09-30 13F COSTAR GROUP COM 22160N109 9,306,485 -2,747 -0.03 785,188 4.91 7.8279
2025-08-14 2025-06-30 13F COSTAR GROUP COM 22160N109 9,309,232 -4,360 -0.05 748,462 1.43 7.3301
2025-05-13 2025-03-31 13F COSTAR GROUP COM 22160N109 9,313,592 -288 -0.00 737,916 10.67 7.0950
2025-02-13 2024-12-31 13F COSTAR GROUP COM 22160N109 9,313,880 379,787 4.25 666,781 -1.07 5.7675
2024-11-13 2024-09-30 13F COSTAR GROUP COM 22160N109 8,934,093 163,670 1.87 673,988 3.65 5.6082
2024-08-13 2024-06-30 13F COSTAR GROUP COM 22160N109 8,770,423 1,508,797 20.78 650,239 -7.30 5.7209
2024-05-23 2024-03-31 13F/A-1 COSTAR GROUP COM 22160N109 7,261,626 5,957 0.08 701,473 10.63 5.8025
2024-05-13 2024-03-31 13F COSTAR GROUP COM 22160N109 7,261,626 5,957 701,473 5.8032
2024-02-09 2023-12-31 13F COSTAR GROUP COM 22160N109 7,255,669 6,443 0.09 634,073 13.76 5.3353
2023-11-13 2023-09-30 13F COSTAR GROUP COM 22160N109 7,249,226 137,796 1.94 557,393 -11.93 4.8404
2023-08-11 2023-06-30 13F COSTAR GROUP COM 22160N109 7,111,430 0 0.00 632,917 29.27 5.2726
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 7,111,430 0 0.00 489,622 -10.91 4.3080
2023-02-13 2022-12-31 13F COSTAR GROUP COM 22160N109 7,111,430 0 0.00 549,571 10.95 4.9669
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 7,111,430 0 0.00 495,311 15.30 4.3693
2022-08-11 2022-06-30 13F COSTAR GROUP COM 22160N109 7,111,430 -2,556,750 -26.44 429,601 -33.29 3.4388
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 9,668,180 -96,170 -0.98 643,997 -16.55 4.3913
2022-02-11 2021-12-31 13F COSTAR GROUP COM 22160N109 9,764,350 1,350 0.01 771,677 -8.16 4.3061
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 9,763,000 -4,600 -0.05 840,204 3.86 5.1731
2021-08-13 2021-06-30 13F COSTAR GROUP COM 22160N109 9,767,600 8,790,840 900.00 808,953 0.77 4.9820
2021-07-09 2021-03-31 13F/A-1 COSTAR GROUP COM 22160N109 976,760 10,799 1.12 802,789 -10.08 5.4662
2021-05-13 2021-03-31 13F COSTAR GROUP COM 22160N109 977,045 11,084 803,024 5.4526
2021-02-10 2020-12-31 13F COSTAR GROUP COM 22160N109 965,961 7,168 0.75 892,818 9.74 6.0334
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 958,793 3,440 0.36 813,545 19.83 5.7349
2020-08-11 2020-06-30 13F COSTAR GROUP COM 22160N109 955,353 517,041 117.96 678,941 163.79 5.1147
2020-05-11 2020-03-31 13F COSTAR GROUP COM 22160N109 438,312 188,312 75.32 257,381 72.07 2.5004
2020-02-14 2019-12-31 13F COSTAR GROUP COM 22160N109 250,000 250,000 149,575 1.3716
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.