CoStar Group, Inc.
US ˙ NasdaqGS ˙ US22160N1090

SecurityCSGP / CoStar Group, Inc.
InstitutionMackenzie Financial Corp
Latest Disclosed Ownership1,638,673 shares
Latest Disclosed Value $ 66,104,069
Mackenzie Financial Corp reports 1.33% decrease in ownership of CSGP / CoStar Group, Inc.

On May 13, 2026 - Mackenzie Financial Corp filed a 13F-HR form disclosing ownership of 1,638,673 shares of CoStar Group, Inc. (US:CSGP) valued at $66,104,069 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 1,660,715 shares of CoStar Group, Inc.. This represents a change in shares of -1.33% during the quarter. The current value of the position is $54,731,678 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 1,638,673 -22,042 -1.33 66,104 -41.23 0.0793
2026-02-18 2025-12-31 13F COSTAR GROUP COM 22160N109 1,660,715 14,779 0.90 112,474 -19.01 0.1332
2025-11-13 2025-09-30 13F COSTAR GROUP COM 22160N109 1,645,936 -217,789 -11.69 138,868 -7.33 0.1682
2025-08-13 2025-06-30 13F COSTAR GROUP COM 22160N109 1,863,725 -599,629 -24.34 149,843 -23.22 0.1941
2025-05-07 2025-03-31 13F COSTAR GROUP COM 22160N109 2,463,354 -472,205 -16.09 195,172 -7.13 0.2775
2025-05-02 2024-12-31 13F/A-2 COSTAR GROUP COM 22160N109 2,935,559 128,540 4.58 210,157 -0.76 0.2864
2025-02-20 2024-12-31 13F/A-1 COSTAR GROUP COM 22160N109 2,935,559 128,540 210,157 0.2730
2025-02-14 2024-12-31 13F CoStar Group Common Stock 22160N109 2,935,559 128,540 192,764 0.2767
2024-11-13 2024-09-30 13F COSTAR GROUP COM 22160N109 2,807,019 448,493 19.02 211,762 21.10 0.2947
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 2,358,526 341,046 16.90 174,861 -10.28 0.2598
2024-05-10 2024-03-31 13F COSTAR GROUP COM 22160N109 2,017,480 -125,801 -5.87 194,889 4.05 0.2808
2024-01-30 2023-12-31 13F COSTAR GROUP COM 22160N109 2,143,281 -790 -0.04 187,301 16.23 0.2825
2023-10-25 2023-09-30 13F COSTAR GROUP COM 22160N109 2,144,071 -199,473 -8.51 161,148 -21.42 0.2709
2023-08-03 2023-06-30 13F COSTAR GROUP COM 22160N109 2,343,544 -208,534 -8.17 205,084 16.72 0.3111
2023-04-24 2023-03-31 13F COSTAR GROUP COM 22160N109 2,552,078 -2,816 -0.11 175,711 -11.01 0.2714
2023-02-14 2022-12-31 13F COSTAR GROUP COM 22160N109 2,554,894 -719,756 -21.98 197,442 -13.43 0.3298
2022-10-07 2022-09-30 13F CoStar Group Common Stock 22160N109 3,274,650 -303,682 -8.49 228,079 5.51 0.3923
2022-08-10 2022-06-30 13F COSTAR GROUP COM 22160N109 3,578,332 664,746 22.82 216,167 11.38 0.3462
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 2,913,586 2,257,140 343.84 194,074 274.09 0.2602
2022-02-14 2021-12-31 13F COSTAR GROUP COM 22160N109 656,446 620,766 1,739.82 51,879 1,589.32 0.0699
2021-11-08 2021-09-30 13F COSTAR GROUP COM 22160N109 35,680 7,414 26.23 3,071 31.18 0.0044
2021-08-11 2021-06-30 13F COSTAR GROUP COM 22160N109 28,266 25,750 1,023.45 2,341 13.20 0.0033
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 2,516 158 6.70 2,068 -5.09 0.0032
2021-02-10 2020-12-31 13F COSTAR GROUP COM 22160N109 2,358 1,082 84.80 2,179 101.20 0.0047
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 1,276 -66 -4.92 1,083 13.52 0.0027
2020-08-13 2020-06-30 13F COSTAR GROUP COM 22160N109 1,342 18 1.36 954 22.78 0.0026
2020-05-14 2020-03-31 13F COSTAR GROUP COM 22160N109 1,324 -165,442 -99.21 777 -99.22 0.0025
2020-02-13 2019-12-31 13F COSTAR GROUP COM 22160N109 166,766 -1,596 -0.95 99,776 -0.10 0.2454
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 168,362 -60,061 -26.29 99,872 -21.09 0.2625
2019-08-23 2019-06-30 13F/A-1 COSTAR GROUP COM 22160N109 228,423 -157,605 -40.83 126,560 -29.71 0.3265
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 228,423 -157,605 126,560
2019-05-15 2019-03-31 13F COSTAR GROUP COM 22160N109 386,028 -37,326 -8.82 180,051 26.07 0.4344
2019-02-06 2018-12-31 13F COSTAR GROUP COM 22160N109 423,354 212,278 100.57 142,814 60.77 0.3754
2018-11-15 2018-09-30 13F COSTAR GROUP COM 22160N109 211,076 5,782 2.82 88,829 4.86 0.2161
2018-08-13 2018-06-30 13F COSTAR GROUP COM 22160N109 205,294 -32,610 -13.71 84,710 -1.82 0.2161
2018-05-14 2018-03-31 13F/A-1 COSTAR GROUP COM 22160N109 237,904 11,684 5.16 86,283 28.44 0.2199
2018-05-14 2018-03-31 13F COSTAR GROUP COM 22160N109 237,904 86,283
2018-02-13 2017-12-31 13F COSTAR GROUP COM 22160N109 226,220 43,633 23.90 67,176 37.15 0.1622
2017-11-13 2017-09-30 13F COSTAR GROUP COM 22160N109 182,587 -18,713 -9.30 48,979 -7.70 0.2641
2017-08-14 2017-06-30 13F COSTAR GROUP COM 22160N109 201,300 -2,400 -1.18 53,063 25.71 0.2954
2017-05-25 2017-03-31 13F/A-1 COSTAR GROUP COM 22160N109 203,700 32,851 19.23 42,211 31.08 0.2469
2017-05-12 2017-03-31 13F COSTAR GROUP COM 22160N109 203,700 42,211
2017-02-14 2016-12-31 13F COSTAR GROUP COM 22160N109 170,849 95,501 126.75 32,203 97.38 0.1929
2016-11-15 2016-09-30 13F COSTAR GROUP COM 22160N109 75,348 22,300 42.04 16,315 40.66 0.1019
2016-08-12 2016-06-30 13F COSTAR GROUP COM 22160N109 53,048 2,600 5.15 11,599 22.18 0.0655
2016-05-12 2016-03-31 13F COSTAR GROUP COM 22160N109 50,448 50,448 9,493 0.0861
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.