CoStar Group, Inc.
US ˙ NasdaqGS ˙ US22160N1090

SecurityCSGP / CoStar Group, Inc.
InstitutionFranklin Resources Inc
Latest Disclosed Ownership249,573 shares
Latest Disclosed Value $ 10,067,774
Franklin Resources Inc reports 78.53% decrease in ownership of CSGP / CoStar Group, Inc.

On May 13, 2026 - Franklin Resources Inc filed a 13F-HR form disclosing ownership of 249,573 shares of CoStar Group, Inc. (US:CSGP) valued at $10,067,775 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 1,162,422 shares of CoStar Group, Inc.. This represents a change in shares of -78.53% during the quarter. The current value of the position is $8,335,738 USD.

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 249,573 -912,849 -78.53 10,068 -87.12 0.0004
2026-02-11 2025-12-31 13F COSTAR GROUP COM 22160N109 1,162,422 -2,574,527 -68.89 78,161 -75.21 0.0192
2025-11-13 2025-09-30 13F COSTAR GROUP COM 22160N109 3,736,949 297,045 8.64 315,286 14.00 0.0786
2025-08-12 2025-06-30 13F COSTAR GROUP COM 22160N109 3,439,904 1,419,732 70.28 276,568 72.79 0.0733
2025-05-13 2025-03-31 13F COSTAR GROUP COM 22160N109 2,020,172 -216,945 -9.70 160,058 -0.06 0.0461
2025-02-12 2024-12-31 13F COSTAR GROUP COM 22160N109 2,237,117 14,984 0.67 160,155 -6.81 0.0445
2024-11-27 2024-09-30 13F/A-1 COSTAR GROUP COM 22160N109 2,222,133 -343,767 -13.40 171,860 -9.66 0.0483
2024-11-12 2024-09-30 13F COSTAR GROUP COM 22160N109 2,222,133 -343,767 171,860 0.0083
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 2,565,900 52,408 2.09 190,236 -21.65 0.0585
2024-05-13 2024-03-31 13F COSTAR GROUP COM 22160N109 2,513,492 1,112,353 79.39 242,803 98.30 0.0769
2024-02-09 2023-12-31 13F COSTAR GROUP COM 22160N109 1,401,139 29,737 2.17 122,446 16.12 0.0573
2023-11-13 2023-09-30 13F COSTAR GROUP COM 22160N109 1,371,402 -1,270,274 -48.09 105,447 -55.15 0.0536
2023-08-11 2023-06-30 13F COSTAR GROUP COM 22160N109 2,641,676 -4,511,955 -63.07 235,109 -52.26 0.1118
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 7,153,631 -2,000,379 -21.85 492,528 -30.38 0.2471
2023-02-10 2022-12-31 13F COSTAR GROUP COM 22160N109 9,154,010 -134,007 -1.44 707,422 9.35 0.3677
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 9,288,017 354,925 3.97 646,911 19.88 0.3525
2022-08-11 2022-06-30 13F COSTAR GROUP COM 22160N109 8,933,092 -712,886 -7.39 539,647 -16.01 0.2676
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 9,645,978 44,380 0.46 642,549 -15.33 0.2568
2022-02-11 2021-12-31 13F COSTAR GROUP COM 22160N109 9,601,598 -820,617 -7.87 758,845 -15.39 0.2737
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 10,422,215 -311,595 -2.90 896,910 0.89 0.3377
2021-08-13 2021-06-30 13F COSTAR GROUP COM 22160N109 10,733,810 9,684,933 923.36 888,973 3.12 0.3396
2021-05-13 2021-03-31 13F COSTAR GROUP COM 22160N109 1,048,877 69,415 7.09 862,036 -4.78 0.3507
2021-02-10 2020-12-31 13F COSTAR GROUP COM 22160N109 979,462 27,676 2.91 905,299 12.09 0.3831
2020-11-12 2020-09-30 13F COSTAR GROUP COM 22160N109 951,786 17,357 1.86 807,618 22.59 0.3911
2020-08-13 2020-06-30 13F COSTAR GROUP COM 22160N109 934,429 82,012 9.62 658,798 31.60 0.3394
2020-05-13 2020-03-31 13F COSTAR GROUP COM 22160N109 852,417 -20,405 -2.34 500,588 -4.14 0.3342
2020-03-11 2019-12-31 13F/A-1 COSTAR GROUP COM 22160N109 872,822 41,537 5.00 522,191 5.91 0.2744
2020-02-12 2019-12-31 13F COSTAR GROUP COM 22160N109 872,822 41,537 522,191 65,959.8726
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 831,285 -10,818 -1.28 493,038 5.68 0.2678
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 842,103 -41,969 -4.75 466,524 13.14 0.2481
2019-05-15 2019-03-31 13F/A-1 COSTAR GROUP COM 22160N109 884,072 -60,164 -6.37 412,340 29.45 0.2208
2019-05-14 2019-03-31 13F COSTAR GROUP COM 22160N109 884,072 -60,164 412,340
2019-02-12 2018-12-31 13F COSTAR GROUP COM 22160N109 944,236 -3,640 -0.38 318,530 -20.15 0.1922
2018-11-13 2018-09-30 13F COSTAR GROUP COM 22160N109 947,876 -27,369 -2.81 398,889 -0.88 0.1986
2018-08-14 2018-06-30 13F COSTAR GROUP COM 22160N109 975,245 53,088 5.76 402,420 20.31 0.2064
2018-05-10 2018-03-31 13F COSTAR GROUP COM 22160N109 922,157 128,808 16.24 334,483 41.98 0.1696
2018-02-14 2017-12-31 13F COSTAR GROUP COM 22160N109 793,349 83,605 11.78 235,579 23.74 0.1130
2017-11-13 2017-09-30 13F COSTAR GROUP COM 22160N109 709,744 18,988 2.75 190,375 4.56 0.0933
2017-08-10 2017-06-30 13F COSTAR GROUP COM 22160N109 690,756 -111,970 -13.95 182,064 9.46 0.0908
2017-05-12 2017-03-31 13F COSTAR GROUP COM 22160N109 802,726 -86,403 -9.72 166,333 -0.75 0.0844
2017-02-14 2016-12-31 13F COSTAR GROUP COM 22160N109 889,129 -21,503 -2.36 167,587 -15.01 0.0868
2016-11-14 2016-09-30 13F COSTAR GROUP COM 22160N109 910,632 110,392 13.79 197,177 12.69 0.1031
2016-08-11 2016-06-30 13F COSTAR GROUP COM 22160N109 800,240 -41,900 -4.98 174,980 10.42 0.0941
2016-05-10 2016-03-31 13F COSTAR GROUP COM 22160N109 842,140 96,561 12.95 158,466 2.83 0.0841
2016-04-27 2015-12-31 13F/A-1 COSTAR GROUP COM 22160N109 745,579 167,769 29.04 154,104 54.11 0.0780
2016-02-12 2015-12-31 13F COSTAR GROUP COM 22160N109 745,579 154,104
2015-11-10 2015-09-30 13F COSTAR GROUP COM 22160N109 577,810 9,570 1.68 99,996 -12.56 0.0494
2015-08-12 2015-06-30 13F COSTAR GROUP COM 22160N109 568,240 64,490 12.80 114,364 14.76 0.0519
2015-05-14 2015-03-31 13F COSTAR GROUP COM 22160N109 503,750 76,887 18.01 99,657 27.14 0.0452
2015-02-10 2014-12-31 13F COSTAR GROUP COM 22160N109 426,863 48,353 12.77 78,385 33.14 0.0356
2014-11-12 2014-09-30 13F COSTAR GROUP COM 22160N109 378,510 234,010 161.94 58,873 157.58 0.0269
2014-08-12 2014-06-30 13F COSTAR GROUP COM 22160N109 144,500 144,500 22,856 0.0101
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.