CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionGuggenheim Capital Llc
Latest Disclosed Ownership88,384 shares
Latest Disclosed Value $ 3,565,411
Guggenheim Capital Llc reports 18.80% decrease in ownership of CSGP / CoStar Group, Inc.

On May 15, 2026 - Guggenheim Capital Llc filed a 13F-HR form disclosing ownership of 88,384 shares of CoStar Group, Inc. (MX:CSGP) valued at $3,565,411 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 108,846 shares of CoStar Group, Inc.. This represents a change in shares of -18.80% 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 88,384 -20,462 -18.80 3,565 -51.28 0.0138
2026-02-17 2025-12-31 13F COSTAR GROUP COM 22160N109 108,846 -912 -0.83 7,319 -20.97 0.0262
2025-11-13 2025-09-30 13F COSTAR GROUP COM 22160N109 109,758 3,245 3.05 9,260 8.14 0.0476
2025-08-13 2025-06-30 13F COSTAR GROUP COM 22160N109 106,513 23,658 28.55 8,564 30.45 0.0680
2025-05-14 2025-03-31 13F COSTAR GROUP COM 22160N109 82,855 -25,900 -23.81 6,565 -15.68 0.0603
2025-02-13 2024-12-31 13F COSTAR GROUP COM 22160N109 108,755 -2,285 -2.06 7,786 -7.06 0.0631
2024-11-13 2024-09-30 13F COSTAR GROUP COM 22160N109 111,040 -3,481 -3.04 8,377 -1.34 0.0586
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 114,521 -8,377 -6.82 8,491 -28.48 0.0602
2024-05-14 2024-03-31 13F COSTAR GROUP COM 22160N109 122,898 -1,398 -1.12 11,872 9.29 0.0836
2024-02-14 2023-12-31 13F COSTAR GROUP COM 22160N109 124,296 10,454 9.18 10,862 24.09 0.0821
2023-11-14 2023-09-30 13F COSTAR GROUP COM 22160N109 113,842 17,942 18.71 8,753 2.55 0.0753
2023-08-11 2023-06-30 13F COSTAR GROUP COM 22160N109 95,900 10,472 12.26 8,535 45.13 0.0670
2023-05-11 2023-03-31 13F COSTAR GROUP COM 22160N109 85,428 14,928 21.17 5,882 7.95 0.0495
2023-02-14 2022-12-31 13F COSTAR GROUP COM 22160N109 70,500 60,050 574.64 5,448 648.35 0.0479
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 10,450 10,450 728 0.0067
2022-08-15 2022-06-30 13F COSTAR GROUP COM 22160N109 0 -3,192 -100.00 0 -100.00
2022-05-16 2022-03-31 13F COSTAR GROUP COM 22160N109 3,192 -503 -13.61 213 -27.05 0.0013
2022-02-14 2021-12-31 13F COSTAR GROUP COM 22160N109 3,695 204 5.84 292 -2.67 0.0015
2021-11-15 2021-09-30 13F COSTAR GROUP COM 22160N109 3,491 -698 -16.66 300 -13.54 0.0018
2021-08-13 2021-06-30 13F COSTAR GROUP COM 22160N109 4,189 3,652 680.07 347 -21.32 0.0020
2021-05-13 2021-03-31 13F COSTAR GROUP COM 22160N109 537 -4,404 -89.13 441 -90.34 0.0029
2021-02-16 2020-12-31 13F COSTAR GROUP COM 22160N109 4,941 -935 -15.91 4,567 -8.40 0.0286
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 5,876 -6,353 -51.95 4,986 -42.63 0.0361
2020-08-14 2020-06-30 13F COSTAR GROUP COM 22160N109 12,229 5,645 85.74 8,691 124.81 0.0672
2020-06-02 2020-03-31 13F COSTAR GROUP COM 22160N109 6,584 -2,284 -25.76 3,866 -27.14 0.0389
2020-02-20 2019-12-31 13F/A-1 COSTAR GROUP COM 22160N109 8,868 7,069 392.94 5,306 397.28 0.0398
2020-02-14 2019-12-31 13F COSTAR GROUP COM 22160N109 8,868 7,069 5,306 31,447.6014
2020-02-20 2019-09-30 13F/A-1 COSTAR GROUP COM 22160N109 1,799 304 20.33 1,067 28.86 0.0085
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 1,799 304 1,067 7,819.2890
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 1,495 -60 -3.86 828 14.05 0.0067
2019-05-15 2019-03-31 13F COSTAR GROUP COM 22160N109 1,555 -34 -2.14 726 35.45 0.0059
2019-02-14 2018-12-31 13F COSTAR GROUP COM 22160N109 1,589 -892 -35.95 536 -48.66 0.0045
2018-11-14 2018-09-30 13F COSTAR GROUP COM 22160N109 2,481 -456 -15.53 1,044 -13.86 0.0068
2018-08-14 2018-06-30 13F COSTAR GROUP COM 22160N109 2,937 760 34.91 1,212 53.61 0.0081
2018-05-15 2018-03-31 13F COSTAR GROUP COM 22160N109 2,177 -1,360 -38.45 789 -24.93 0.0019
2018-02-14 2017-12-31 13F COSTAR GROUP COM 22160N109 3,537 -6,720 -65.52 1,051 -61.78 0.0025
2017-11-14 2017-09-30 13F COSTAR GROUP COM 22160N109 10,257 7,010 215.89 2,750 221.26 0.0065
2017-08-14 2017-06-30 13F COSTAR GROUP COM 22160N109 3,247 387 13.53 856 44.35 0.0023
2017-05-15 2017-03-31 13F COSTAR GROUP COM 22160N109 2,860 -50 -1.72 593 8.01 0.0016
2017-02-14 2016-12-31 13F COSTAR GROUP COM 22160N109 2,910 1,123 62.84 549 41.86 0.0016
2016-11-14 2016-09-30 13F COSTAR GROUP COM 22160N109 1,787 1,787 0.00 387 0.0012
2016-08-15 2016-06-30 13F COSTAR GROUP COM 22160N109 0 -1,483 -100.00 0 -100.00
2016-05-16 2016-03-31 13F COSTAR GROUP COM 22160N109 1,483 -2,033 -57.82 279 -61.62 0.0009
2016-02-16 2015-12-31 13F COSTAR GROUP COM 22160N109 3,516 1,022 40.98 727 68.29 0.0021
2015-11-16 2015-09-30 13F COSTAR GROUP COM 22160N109 2,494 -999 -28.60 432 -38.55 0.0013
2015-08-14 2015-06-30 13F COSTAR GROUP COM 22160N109 3,493 1,322 60.89 703 63.87 0.0017
2015-05-18 2015-03-31 13F/A-1 COSTAR GROUP COM 22160N109 2,171 -82 -3.64 429 3.62 0.0010
2015-05-15 2015-03-31 13F COSTAR GROUP COM 22160N109 2,171 429
2015-02-17 2014-12-31 13F COSTAR GROUP COM 22160N109 2,253 -1,955 -46.46 414 -36.79 0.0010
2014-11-14 2014-09-30 13F COSTAR GROUP COM 22160N109 4,208 -127 -2.93 655 -4.52 0.0016
2014-08-14 2014-06-30 13F COSTAR GROUP COM 22160N109 4,335 -2,542 -36.96 686 -46.57 0.0017
2014-05-16 2014-03-31 13F COSTAR GROUP COM 22160N109 6,877 1,062 18.26 1,284 19.66 0.0037
2014-02-14 2013-12-31 13F COSTAR GROUP COM 22160N109 5,815 700 13.69 1,073 24.91 0.0033
2013-11-14 2013-09-30 13F COSTAR GROUP COM 22160N109 5,115 2,959 137.24 859 208.99 0.0031
2013-08-22 2013-06-30 13F/A-1 COSTAR GROUP COM 22160N109 2,156 2,156 278 0.0012
2013-08-14 2013-06-30 13F COSTAR GROUP COM 22160N109 2,156 278 0.0012
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.