CoStar Group, Inc.
US ˙ NasdaqGS ˙ US22160N1090

SecurityCSGP / CoStar Group, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership2,401,852 shares
Latest Disclosed Value $ 96,912,686
Dimensional Fund Advisors Lp reports 3.54% increase in ownership of CSGP / CoStar Group, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 2,401,852 shares of CoStar Group, Inc. (US:CSGP) valued at $96,890,710 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,319,754 shares of CoStar Group, Inc.. This represents a change in shares of 3.54% during the quarter. The current value of the position is $80,221,857 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)
2026-05-07 2026-03-31 13F COSTAR GROUP COM 22160N109 2,401,852 82,098 3.54 96,913 -37.87 0.0043
2026-02-12 2025-12-31 13F COSTAR GROUP COM 22160N109 2,319,754 83,574 3.74 155,995 -17.31 0.0327
2025-11-12 2025-09-30 13F COSTAR GROUP COM 22160N109 2,236,180 67,262 3.10 188,661 8.18 0.0405
2025-08-12 2025-06-30 13F COSTAR GROUP COM 22160N109 2,168,918 22,322 1.04 174,393 2.54 0.0404
2025-05-13 2025-03-31 13F COSTAR GROUP COM 22160N109 2,146,596 149,035 7.46 170,069 18.92 0.0423
2025-02-13 2024-12-31 13F COSTAR GROUP COM 22160N109 1,997,561 212,775 11.92 143,011 6.22 0.0343
2024-11-07 2024-09-30 13F COSTAR GROUP COM 22160N109 1,784,786 86,853 5.12 134,638 6.95 0.0327
2024-08-09 2024-06-30 13F COSTAR GROUP COM 22160N109 1,697,933 219,758 14.87 125,889 -11.84 0.0329
2024-05-10 2024-03-31 13F COSTAR GROUP COM 22160N109 1,478,175 158,159 11.98 142,792 23.78 0.0387
2024-02-07 2023-12-31 13F COSTAR GROUP COM 22160N109 1,320,016 62,928 5.01 115,361 19.35 0.0337
2023-11-09 2023-09-30 13F COSTAR GROUP COM 22160N109 1,257,088 36,309 2.97 96,659 -11.04 0.0317
2023-08-09 2023-06-30 13F COSTAR GROUP COM 22160N109 1,220,779 71,993 6.27 108,658 37.39 0.0346
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 1,148,786 64,676 5.97 79,091 95,189.16 0.0266
2023-02-09 2022-12-31 13F COSTAR GROUP COM 22160N109 1,084,110 -15,958 -1.45 84 -99.89 0.0248
2022-11-10 2022-09-30 13F COSTAR GROUP COM 22160N109 1,100,068 116,316 11.82 76,626 28.95 0.0294
2022-08-12 2022-06-30 13F COSTAR GROUP COM 22160N109 983,752 99,991 11.31 59,424 0.93 0.0213
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 883,761 13,855 1.59 58,875 -14.37 0.0181
2022-02-09 2021-12-31 13F COSTAR GROUP COM 22160N109 869,906 24,223 2.86 68,754 -5.53 0.0208
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 845,683 2,926 0.35 72,778 4.27 0.0234
2021-08-12 2021-06-30 13F COSTAR GROUP COM 22160N109 842,757 760,701 927.05 69,800 3.52 0.0221
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 82,056 -245 -0.30 67,429 -11.36 0.0223
2021-03-08 2020-12-31 13F/A-2 COSTAR GROUP COM 22160N109 82,301 3,516 4.46 76,070 13.79 0.0275
2021-02-11 2020-12-31 13F COSTAR GROUP COM 22160N109 82,301 3,516 76,070 27,472.4407
2020-11-12 2020-09-30 13F COSTAR GROUP COM 22160N109 78,785 -2,353 -2.90 66,854 15.96 0.0284
2020-08-13 2020-06-30 13F COSTAR GROUP COM 22160N109 81,138 2,474 3.15 57,655 24.80 0.0253
2020-05-14 2020-03-31 13F COSTAR GROUP COM 22160N109 78,664 -8,462 -9.71 46,198 -11.37 0.0241
2020-02-14 2019-12-31 13F COSTAR GROUP COM 22160N109 87,126 -721 -0.82 52,127 0.05 0.0190
2019-11-12 2019-09-30 13F COSTAR GROUP COM 22160N109 87,847 -907 -1.02 52,101 5.96 0.0202
2019-08-13 2019-06-30 13F COSTAR GROUP COM 22160N109 88,754 2,333 2.70 49,169 21.99 0.0191
2019-08-12 2019-03-31 13F/A-2 COSTAR GROUP COM 22160N109 86,421 -214 -0.25 40,307 37.91 0.0161
2019-05-10 2019-03-31 13F COSTAR GROUP COM 22160N109 86,421 -214 40,307
2019-02-26 2018-12-31 13F/A-1 COSTAR GROUP COM 22160N109 86,635 10,145 13.26 29,227 -9.20 0.0132
2019-02-13 2018-12-31 13F COSTAR GROUP COM 22160N109 86,635 10,145 29,227
2018-11-13 2018-09-30 13F COSTAR GROUP COM 22160N109 76,490 6,797 9.75 32,188 11.92 0.0123
2018-08-10 2018-06-30 13F COSTAR GROUP COM 22160N109 69,693 3,656 5.54 28,759 20.08 0.0115
2018-05-11 2018-03-31 13F COSTAR GROUP COM 22160N109 66,037 -414 -0.62 23,950 21.38 0.0100
2018-02-12 2017-12-31 13F COSTAR GROUP COM 22160N109 66,451 -9,839 -12.90 19,732 -3.57 0.0082
2017-11-13 2017-09-30 13F COSTAR GROUP COM 22160N109 76,290 -485 -0.63 20,463 1.12 0.0089
2017-08-11 2017-06-30 13F COSTAR GROUP COM 22160N109 76,775 1,760 2.35 20,236 30.19 0.0093
2017-05-12 2017-03-31 13F COSTAR GROUP COM 22160N109 75,015 5,189 7.43 15,544 18.11 0.0074
2017-02-09 2016-12-31 13F COSTAR GROUP COM 22160N109 69,826 1,640 2.41 13,161 -10.86 0.0066
2016-11-10 2016-09-30 13F COSTAR GROUP COM 22160N109 68,186 3,004 4.61 14,764 3.61 0.0080
2016-08-09 2016-06-30 13F COSTAR GROUP COM 22160N109 65,182 -3,780 -5.48 14,250 9.82 0.0082
2016-05-13 2016-03-31 13F COSTAR GROUP COM 22160N109 68,962 -6,722 -8.88 12,976 -17.05 0.0078
2016-02-10 2015-12-31 13F COSTAR GROUP COM 22160N109 75,684 -6,928 -8.39 15,643 9.45 0.0098
2015-11-13 2015-09-30 13F COSTAR GROUP COM 22160N109 82,612 -6,712 -7.51 14,293 -20.50 0.0094
2015-08-14 2015-06-30 13F COSTAR GROUP COM 22160N109 89,324 -7,831 -8.06 17,978 -6.46 0.0110
2015-05-14 2015-03-31 13F COSTAR GROUP COM 22160N109 97,155 4,268 4.59 19,219 12.68 0.0121
2015-02-06 2014-12-31 13F COSTAR GROUP COM 22160N109 92,887 -8,729 -8.59 17,057 7.91 0.0112
2014-11-13 2014-09-30 13F COSTAR GROUP COM 22160N109 101,616 -63,358 -38.40 15,806 -39.42 0.0112
2014-08-08 2014-06-30 13F COSTAR GROUP COM 22160N109 164,974 -25,902 -13.57 26,093 -26.80 0.0181
2014-05-14 2014-03-31 13F COSTAR GROUP COM 22160N109 190,876 -54,024 -22.06 35,647 -21.14 0.0266
2014-02-12 2013-12-31 13F COSTAR GROUP COM 22160N109 244,900 -4,890 -1.96 45,202 7.78 0.0352
2013-11-13 2013-09-30 13F COSTAR GROUP COM 22160N109 249,790 -5,640 -2.21 41,938 27.20 0.0363
2013-08-15 2013-06-30 13F COSTAR GROUP COM 22160N109 255,430 255,430 32,969 0.0310
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.