CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionAmeriprise Financial Inc
Latest Disclosed Ownership687,776 shares
Latest Disclosed Value $ 27,716,215
Ameriprise Financial Inc reports 11.83% increase in ownership of CSGP / CoStar Group, Inc.

On May 15, 2026 - Ameriprise Financial Inc filed a 13F-HR form disclosing ownership of 687,776 shares of CoStar Group, Inc. (MX:CSGP) valued at $27,716,215 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 615,038 shares of CoStar Group, Inc.. This represents a change in shares of 11.83% 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)
2026-05-15 2026-03-31 13F COSTAR GROUP COM 22160N109 687,776 72,738 11.83 27,716 -32.98 0.0012
2026-02-17 2025-12-31 13F COSTAR GROUP COM 22160N109 615,038 -607,496 -49.69 41,355 -59.91 0.0093
2025-11-14 2025-09-30 13F COSTAR GROUP COM 22160N109 1,222,534 144,789 13.43 103,146 19.03 0.0237
2025-08-14 2025-06-30 13F COSTAR GROUP COM 22160N109 1,077,745 -1,445,936 -57.29 86,651 -56.66 0.0214
2025-05-14 2025-03-31 13F COSTAR GROUP COM 22160N109 2,523,681 -225,435 -8.20 199,946 1.58 0.0540
2025-02-14 2024-12-31 13F COSTAR GROUP COM 22160N109 2,749,116 665,483 31.94 196,832 25.22 0.0505
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 2,083,633 -588,391 -22.02 157,189 -20.65 0.0403
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 2,672,024 -371,906 -12.22 198,104 -32.63 0.0536
2024-05-15 2024-03-31 13F COSTAR GROUP COM 22160N109 3,043,930 92,675 3.14 294,042 14.01 0.0809
2024-02-14 2023-12-31 13F COSTAR GROUP COM 22160N109 2,951,255 -137,338 -4.45 257,910 8.60 0.0772
2023-11-14 2023-09-30 13F COSTAR GROUP COM 22160N109 3,088,593 -208,811 -6.33 237,482 -19.08 0.0780
2023-08-14 2023-06-30 13F COSTAR GROUP COM 22160N109 3,297,404 -576,014 -14.87 293,469 10.04 0.0920
2023-05-22 2023-03-31 13F/A-1 COSTAR GROUP COM 22160N109 3,873,418 -732,842 -15.91 266,685 -25.08 0.0875
2023-05-15 2023-03-31 13F COSTCO WHOLESALE COM 22160N109 3,873,418 -732,842 266,685 0.0161
2023-02-14 2022-12-31 13F COSTAR GROUP COM 22160N109 4,606,260 -1,248,680 -21.33 355,971 -12.71 0.1220
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 5,854,940 17,811 0.31 407,803 15.65 0.1508
2022-08-15 2022-06-30 13F COSTAR GROUP COM 22160N109 5,837,129 725,462 14.19 352,615 3.59 0.1230
2022-05-16 2022-03-31 13F COSTAR GROUP COM 22160N109 5,111,667 655,352 14.71 340,388 -3.32 0.1004
2022-02-14 2021-12-31 13F COSTAR GROUP COM 22160N109 4,456,315 1,555,454 53.62 352,079 40.85 0.0974
2021-11-15 2021-09-30 13F COSTAR GROUP COM 22160N109 2,900,861 112,626 4.04 249,976 8.25 0.0799
2021-08-16 2021-06-30 13F COSTAR GROUP COM 22160N109 2,788,235 2,566,989 1,160.24 230,932 26.99 0.0714
2021-05-17 2021-03-31 13F COSTAR GROUP COM 22160N109 221,246 -9,394 -4.07 181,844 -14.70 0.0604
2021-02-12 2020-12-31 13F COSTAR GROUP COM 22160N109 230,640 2,760 1.21 213,178 10.25 0.0756
2020-11-16 2020-09-30 13F COSTAR GROUP COM 22160N109 227,880 -16,732 -6.84 193,352 11.23 0.0786
2020-08-14 2020-06-30 13F COSTAR GROUP COM 22160N109 244,612 24,744 11.25 173,834 34.65 0.0745
2020-05-15 2020-03-31 13F COSTAR GROUP COM 22160N109 219,868 161,785 278.54 129,105 271.51 0.0678
2020-02-14 2019-12-31 13F COSTAR GROUP COM 22160N109 58,083 9,213 18.85 34,751 19.87 0.0144
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 48,870 -13,013 -21.03 28,991 -15.44 0.0130
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 61,883 -101,303 -62.08 34,286 -54.95 0.0154
2019-05-15 2019-03-31 13F COSTAR GROUP COM 22160N109 163,186 38,472 30.85 76,114 80.92 0.0350
2019-02-14 2018-12-31 13F COSTAR GROUP COM 22160N109 124,714 73,064 141.46 42,070 93.54 0.0210
2018-11-14 2018-09-30 13F COSTAR GROUP COM 22160N109 51,650 -15,224 -22.77 21,737 -21.23 0.0076
2018-08-14 2018-06-30 13F COSTAR GROUP COM 22160N109 66,874 -6,811 -9.24 27,594 3.26 0.0122
2018-05-14 2018-03-31 13F COSTAR GROUP COM 22160N109 73,685 -14,629 -16.56 26,723 1.90 0.0121
2018-02-12 2017-12-31 13F COSTAR GROUP COM 22160N109 88,314 21,148 31.49 26,225 45.55 0.0120
2017-11-07 2017-09-30 13F COSTAR GROUP COM 22160N109 67,166 -13,280 -16.51 18,018 -14.96 0.0086
2017-08-10 2017-06-30 13F COSTAR GROUP COM 22160N109 80,446 -67,224 -45.52 21,187 -30.76 0.0106
2017-05-05 2017-03-31 13F COSTAR GROUP COM 22160N109 147,670 -42,501 -22.35 30,601 -14.63 0.0158
2017-02-03 2016-12-31 13F COSTAR GROUP COM 22160N109 190,171 -16,535 -8.00 35,844 -19.91 0.0196
2016-11-08 2016-09-30 13F COSTAR GROUP COM 22160N109 206,706 7,363 3.69 44,757 2.68 0.0251
2016-08-08 2016-06-30 13F COSTAR GROUP COM 22160N109 199,343 3,423 1.75 43,590 18.24 0.0255
2016-05-12 2016-03-31 13F COSTAR GROUP COM 22160N109 195,920 -17,495 -8.20 36,866 -16.42 0.0220
2016-02-11 2015-12-31 13F COSTAR GROUP COM 22160N109 213,415 -91,019 -29.90 44,110 -16.28 0.0259
2015-11-12 2015-09-30 13F COSTAR GROUP COM 22160N109 304,434 12,087 4.13 52,687 -10.45 0.0326
2015-08-13 2015-06-30 13F COSTAR GROUP COM 22160N109 292,347 -22,262 -7.08 58,837 -5.47 0.0335
2015-05-14 2015-03-31 13F COSTAR GROUP COM 22160N109 314,609 -139,125 -30.66 62,239 -25.30 0.0357
2015-02-13 2014-12-31 13F COSTAR GROUP COM 22160N109 453,734 -60,759 -11.81 83,318 4.12 0.0486
2014-11-14 2014-09-30 13F COSTAR GROUP COM 22160N109 514,493 21,544 4.37 80,023 2.63 0.0481
2014-08-13 2014-06-30 13F COSTAR GROUP COM 22160N109 492,949 162,463 49.16 77,970 26.34 0.0460
2014-05-14 2014-03-31 13F COSTAR GROUP COM 22160N109 330,486 -81,683 -19.82 61,713 -18.88 0.0371
2014-02-14 2013-12-31 13F COSTAR GROUP COM 22160N109 412,169 -43,379 -9.52 76,079 -0.53 0.0461
2013-11-14 2013-09-30 13F COSTAR GROUP COM 22160N109 455,548 23,421 5.42 76,488 37.13 0.0502
2013-08-14 2013-06-30 13F COSTAR GROUP COM 22160N109 432,127 432,127 55,776 0.0386
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.