CoStar Group, Inc.
US ˙ NasdaqGS ˙ US22160N1090

SecurityCSGP / CoStar Group, Inc.
InstitutionMacquarie Group Ltd
Latest Disclosed Ownership38,996 shares
Latest Disclosed Value $ 1,573,099
Macquarie Group Ltd reports 44.05% decrease in ownership of CSGP / CoStar Group, Inc.

On May 15, 2026 - Macquarie Group Ltd filed a 13F-HR form disclosing ownership of 38,996 shares of CoStar Group, Inc. (US:CSGP) valued at $1,573,099 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 69,698 shares of CoStar Group, Inc.. This represents a change in shares of -44.05% during the quarter. The current value of the position is $1,302,466 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)
2026-05-15 2026-03-31 13F COSTAR GROUP COM 22160N109 38,996 -30,702 -44.05 1,573 -66.43 0.0073
2026-02-13 2025-12-31 13F COSTAR GROUP COM 22160N109 69,698 -4,197,458 -98.37 4,686 -98.70 0.0205
2025-11-13 2025-09-30 13F COSTAR GROUP COM 22160N109 4,267,156 -567,455 -11.74 360,020 -7.38 0.4202
2025-08-14 2025-06-30 13F COSTAR GROUP COM 22160N109 4,834,611 -1,342,269 -21.73 388,703 -20.57 0.4768
2025-08-14 2025-03-31 13F/A-1 COSTAR GROUP COM 22160N109 6,176,880 -1,150,187 -15.70 489,395 -6.50 0.6075
2025-05-15 2025-03-31 13F COSTAR GROUP COM 22160N109 6,200,676 -1,126,391 487,513 0.3983
2025-02-14 2024-12-31 13F COSTAR GROUP COM 22160N109 7,327,067 -296,804 -3.89 523,408 -9.00 0.6351
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 7,623,871 -825,994 -9.78 575,145 -8.19 0.6208
2024-08-09 2024-06-30 13F COSTAR GROUP COM 22160N109 8,449,865 -36,286 -0.43 626,473 -23.58 0.7185
2024-05-14 2024-03-31 13F COSTAR GROUP COM 22160N109 8,486,151 -334,912 -3.80 819,763 6.34 0.9298
2024-02-14 2023-12-31 13F COSTAR GROUP COM 22160N109 8,821,063 -86,040 -0.97 770,873 12.56 0.8905
2023-11-14 2023-09-30 13F COSTAR GROUP COM 22160N109 8,907,103 35,793 0.40 684,867 -13.26 0.8603
2023-10-27 2023-06-30 13F/A-2 COSTAR GROUP COM 22160N109 8,871,310 172,498 1.98 789,547 31.83 0.9027
2023-10-12 2023-06-30 13F/A-1 COSTAR GROUP COM 22160N109 8,871,310 172,498 789,547 0.7936
2023-08-14 2023-06-30 13F COSTAR GROUP COM 22160N109 8,871,310 172,498 789,547 0.8009
2023-06-01 2023-03-31 13F/A-1 COSTAR GROUP COM 22160N109 8,698,812 770,204 9.71 598,913 -2.25 0.7114
2023-05-15 2023-03-31 13F COSTAR GROUP COM 22160N109 8,698,812 770,204 598,913 0.5498
2023-02-21 2022-12-31 13F COSTAR GROUP COM 22160N109 7,928,608 -311,008 -3.77 612,723 6.77 0.7236
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 8,239,616 -189,678 -2.25 573,889 12.70 0.7039
2022-08-17 2022-06-30 13F/A-1 COSTAR GROUP COM 22160N109 8,429,294 180,066 2.18 509,214 -7.33 0.5717
2022-08-15 2022-06-30 13F COSTAR GROUP COM 22160N109 8,429,294 180,066 509,214 0.1824
2022-05-16 2022-03-31 13F COSTAR GROUP COM 22160N109 8,249,228 1,141,896 16.07 549,481 -2.17 0.4179
2022-02-11 2021-12-31 13F Costar Grp COM 22160N109 7,107,332 2,382,444 50.42 561,693 38.14 0.4680
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 4,724,888 949,704 25.16 406,624 30.05 0.3465
2021-08-13 2021-06-30 13F COSTAR GROUP COM 22160N109 3,775,184 3,774,160 368,570.31 312,660 37,077.17 0.2568
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 1,024 165 19.21 841 5.92 0.0012
2021-02-16 2020-12-31 13F COSTAR GROUP COM 22160N109 859 -358 -29.42 794 -23.14 0.0012
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 1,217 -250 -17.04 1,033 -0.96 0.0017
2020-08-11 2020-06-30 13F COSTAR GROUP COM 22160N109 1,467 -2,887 -66.31 1,043 -59.19 0.0018
2020-05-15 2020-03-31 13F COSTAR GROUP COM 22160N109 4,354 966 28.51 2,556 26.10 0.0053
2020-03-18 2019-12-31 13F/A-2 COSTAR GROUP COM 22160N109 3,388 -8,579 -71.69 2,027 -71.45 0.0029
2020-02-28 2019-12-31 13F/A-1 COSTAR GROUP COM 22160N109 3,388 0 2,027 0.0029
2020-02-14 2019-12-31 13F COSTAR GROUP COM 22160N109 3,388 -8,579 2,027 2,543.7132
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 11,967 200 1.70 7,099 8.88 0.0119
2019-11-06 2019-06-30 13F/A-2 COSTAR GROUP COM 22160N109 11,767 0 0.00 6,520 18.80 0.0110
2019-09-24 2019-06-30 13F/A-1 COSTAR GROUP COM 22160N109 11,767 0 6,520 0.0111
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 11,767 0 6,520
2019-05-15 2019-03-31 13F COSTAR GROUP COM 22160N109 11,767 -1,749 -12.94 5,488 20.38 0.0094
2019-02-15 2018-12-31 13F COSTAR GROUP COM 22160N109 13,516 -320 -2.31 4,559 -21.71 0.0088
2018-11-15 2018-09-30 13F COSTAR GROUP COM 22160N109 13,836 -761 -5.21 5,823 -3.32 0.0095
2019-03-21 2018-06-30 13F/A-1 COSTAR GROUP COM 22160N109 14,597 901 6.58 6,023 21.26 0.0104
2018-08-14 2018-06-30 13F COSTAR GROUP COM 22160N109 14,597 901 6,023
2018-05-11 2018-03-31 13F COSTAR GROUP COM 22160N109 13,696 3,107 29.34 4,967 57.98 0.0091
2018-02-14 2017-12-31 13F COSTAR GROUP COM 22160N109 10,589 -63 -0.59 3,144 10.05 0.0056
2017-11-08 2017-09-30 13F COSTAR GROUP COM 22160N109 10,652 1,752 19.69 2,857 21.78 0.0051
2017-08-14 2017-06-30 13F COSTAR GROUP COM 22160N109 8,900 5,900 196.67 2,346 277.17 0.0043
2017-05-15 2017-03-31 13F COSTAR GROUP COM 22160N109 3,000 -1,560 -34.21 622 -27.67 0.0011
2017-03-30 2016-12-31 13F/A-1 CoStar Group COM 22160N109 4,560 1,640 56.16 860 36.08 0.0016
2017-02-15 2016-12-31 13F CoStar Group COM 22160N109 4,560 860
2016-11-15 2016-09-30 13F CoStar Group COM 22160N109 2,920 2,920 632 0.0012
2016-08-15 2016-06-30 13F COSTAR GROUP COMMON 22160N109 0 -43,154 -100.00 0 -100.00
2016-05-16 2016-03-31 13F COSTAR GROUP COMMON 22160N109 43,154 17,023 65.14 8,120 50.34 0.0164
2016-02-16 2015-12-31 13F COSTAR GROUP COMMON 22160N109 26,131 339 1.31 5,401 20.99 0.0111
2015-11-16 2015-09-30 13F COSTAR GROUP COMMON 22160N109 25,792 1,195 4.86 4,464 -9.82 0.0096
2015-08-21 2015-06-30 13F/A-1 COSTAR GROUP COMMON 22160N109 24,597 0 0.00 4,950 1.73 0.0098
2015-08-14 2015-06-30 13F COSTAR GROUP COMMON 22160N109 24,597 4,950
2015-05-18 2015-03-31 13F COSTAR GROUP COMMON 22160N109 24,597 10,227 71.17 4,866 84.39 0.0095
2015-02-17 2014-12-31 13F COSTAR GROUP COMMON 22160N109 14,370 -12,924 -47.35 2,639 -37.83 0.0054
2014-11-14 2014-09-30 13F COSTAR GROUP COMMON 22160N109 27,294 -6,600 -19.47 4,245 -20.82 0.0091
2014-08-14 2014-06-30 13F COSTAR GROUP COMMON 22160N109 33,894 19,278 131.90 5,361 96.45 0.0120
2014-05-15 2014-03-31 13F COSTAR GROUP Common 22160N109 14,616 -2,100 -12.56 2,729 -11.54 0.0047
2014-02-14 2013-12-31 13F COSTAR GROUP Common Stock 22160N109 16,716 1,070 6.84 3,085 17.43 0.0055
2013-11-14 2013-09-30 13F COSTAR GROUP Common Stock 22160N109 15,646 4,376 38.83 2,627 80.55 0.0051
2013-08-16 2013-06-30 13F/A-1 COSTAR GROUP COMMON 22160N109 11,270 11,270 1,455 0.0032
2013-08-14 2013-06-30 13F COSTAR GROUP COMMON 22160N109 11,270 1,455 0.0032
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.