CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionSumitomo Mitsui Trust Holdings, Inc.
Latest Disclosed Ownership954,074 shares
Latest Disclosed Value $ 38,487,345
Sumitomo Mitsui Trust Holdings, Inc. reports 4.56% decrease in ownership of CSGP / CoStar Group, Inc.

On April 30, 2026 - Sumitomo Mitsui Trust Holdings, Inc. filed a 13F-HR form disclosing ownership of 954,074 shares of CoStar Group, Inc. (MX:CSGP) valued at $38,487,345 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 999,684 shares of CoStar Group, Inc.. This represents a change in shares of -4.56% 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)
2026-04-30 2026-03-31 13F COSTAR GROUP COM 22160N109 954,074 -45,610 -4.56 38,487 -42.74 0.0249
2026-01-23 2025-12-31 13F COSTAR GROUP COM 22160N109 999,684 -97,017 -8.85 67,219 -27.35 0.0395
2025-10-27 2025-09-30 13F COSTAR GROUP COM 22160N109 1,096,701 75,401 7.38 92,529 12.69 0.0532
2025-07-31 2025-06-30 13F COSTAR GROUP COM 22160N109 1,021,300 24,290 2.44 82,113 3.95 0.0512
2025-04-25 2025-03-31 13F COSTAR GROUP COM 22160N109 997,010 44,815 4.71 78,993 15.88 0.0558
2025-01-28 2024-12-31 13F COSTAR GROUP COM 22160N109 952,195 -21,889 -2.25 68,168 -7.24 0.0460
2024-11-05 2024-09-30 13F COSTAR GROUP COM 22160N109 974,084 23,825 2.51 73,485 4.30 0.0509
2024-07-19 2024-06-30 13F COSTAR GROUP COM 22160N109 950,259 -85,416 -8.25 70,452 -29.58 0.0520
2024-04-19 2024-03-31 13F COSTAR GROUP COM 22160N109 1,035,675 17,658 1.73 100,046 12.46 0.0687
2024-01-30 2023-12-31 13F COSTAR GROUP COM 22160N109 1,018,017 -956 -0.09 88,965 13.55 0.0658
2023-10-30 2023-09-30 13F COSTAR GROUP COM 22160N109 1,018,973 -2,342 -0.23 78,349 -13.81 0.0643
2023-07-31 2023-06-30 13F COSTAR GROUP COM 22160N109 1,021,315 -152,574 -13.00 90,897 12.47 0.0708
2023-04-27 2023-03-31 13F COSTAR GROUP COM 22160N109 1,173,889 -60,396 -4.89 80,822 -15.27 0.0602
2023-01-30 2022-12-31 13F COSTAR GROUP COM 22160N109 1,234,285 91,288 7.99 95,386 19.82 0.0755
2022-10-21 2022-09-30 13F COSTAR GROUP COM 22160N109 1,142,997 2,053 0.18 79,610 15.50 0.0654
2022-07-26 2022-06-30 13F COSTAR GROUP COM 22160N109 1,140,944 56,028 5.16 68,924 -4.62 0.0530
2022-04-27 2022-03-31 13F COSTAR GROUP COM 22160N109 1,084,916 -3,869 -0.36 72,266 -16.02 0.0481
2022-02-02 2021-12-31 13F COSTAR GROUP COM 22160N109 1,088,785 -182,529 -14.36 86,047 -21.35 0.0523
2021-10-25 2021-09-30 13F COSTAR GROUP COM 22160N109 1,271,314 -61,114 -4.59 109,409 -0.85 0.0681
2021-08-02 2021-06-30 13F COSTAR GROUP COM 22160N109 1,332,428 1,162,324 683.30 110,352 -21.07 0.0653
2021-04-30 2021-03-31 13F COSTAR GROUP COM 22160N109 170,104 8,871 5.50 139,807 -6.18 0.0874
2021-02-05 2020-12-31 13F COSTAR GROUP COM 22160N109 161,233 12,344 8.29 149,024 17.96 0.0963
2020-10-30 2020-09-30 13F COSTAR GROUP COM 22160N109 148,889 -14,732 -9.00 126,334 8.65 0.0851
2020-07-27 2020-06-30 13F COSTAR GROUP COM 22160N109 163,621 -6,619 -3.89 116,281 16.32 0.0821
2020-04-27 2020-03-31 13F COSTAR GROUP COM 22160N109 170,240 29,618 21.06 99,967 18.82 0.0860
2020-01-31 2019-12-31 13F COSTAR GROUP COM 22160N109 140,622 2,339 1.69 84,134 2.57 0.0661
2019-10-31 2019-09-30 13F COSTAR GROUP COM 22160N109 138,283 390 0.28 82,029 7.37 0.0713
2019-07-29 2019-06-30 13F COSTAR GROUP COM 22160N109 137,893 2,214 1.63 76,401 20.73 0.0682
2019-05-08 2019-03-31 13F COSTAR GROUP COM 22160N109 135,679 -8,909 -6.16 63,283 29.80 0.0585
2019-02-06 2018-12-31 13F COSTAR GROUP COM 22160N109 144,588 15,493 12.00 48,754 -10.26 0.0524
2018-11-07 2018-09-30 13F COSTAR GROUP COM 22160N109 129,095 4,910 3.95 54,328 6.02 0.0584
2018-08-01 2018-06-30 13F COSTAR GROUP COM 22160N109 124,185 15,545 14.31 51,242 30.05 0.0597
2018-05-01 2018-03-31 13F COSTAR GROUP COM 22160N109 108,640 1,734 1.62 39,402 24.12 0.0507
2018-02-06 2017-12-31 13F COSTAR GROUP COM 22160N109 106,906 13,900 14.95 31,746 27.24 0.0410
2017-11-07 2017-09-30 13F COSTAR GROUP COM 22160N109 93,006 -1,550 -1.64 24,949 0.10 0.0352
2017-08-07 2017-06-30 13F COSTAR GROUP COM 22160N109 94,556 30 0.03 24,925 27.25 0.0366
2017-05-02 2017-03-31 13F COSTAR GROUP COM 22160N109 94,526 2,257 2.45 19,588 12.63 0.0303
2017-01-27 2016-12-31 13F COSTAR GROUP COM 22160N109 92,269 92,269 17,392 0.0284
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.