CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionArizona State Retirement System
Latest Disclosed Ownership115,162 shares
Latest Disclosed Value $ 4,645,635
Arizona State Retirement System reports 1.08% decrease in ownership of CSGP / CoStar Group, Inc.

On May 1, 2026 - Arizona State Retirement System filed a 13F-HR form disclosing ownership of 115,162 shares of CoStar Group, Inc. (MX:CSGP) valued at $4,645,635 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 116,425 shares of CoStar Group, Inc.. This represents a change in shares of -1.08% 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)
2026-05-01 2026-03-31 13F COSTAR GROUP COM 22160N109 115,162 -1,263 -1.08 4,646 -40.66 0.0272
2026-01-28 2025-12-31 13F COSTAR GROUP COM 22160N109 116,425 -8,435 -6.76 7,828 -25.69 0.0426
2025-11-03 2025-09-30 13F COSTAR GROUP COM 22160N109 124,860 1,645 1.34 10,534 6.34 0.0561
2025-08-13 2025-06-30 13F COSTAR GROUP COM 22160N109 123,215 1,786 1.47 9,906 2.97 0.0571
2025-05-01 2025-03-31 13F COSTAR GROUP COM 22160N109 121,429 2,433 2.04 9,621 12.94 0.0612
2025-02-06 2024-12-31 13F COSTAR GROUP COM 22160N109 118,996 1,960 1.67 8,519 -3.52 0.0521
2024-11-12 2024-09-30 13F COSTAR GROUP COM 22160N109 117,036 4,846 4.32 8,829 6.16 0.0557
2024-08-05 2024-06-30 13F COSTAR GROUP COM 22160N109 112,190 -130 -0.12 8,318 -23.35 0.0555
2024-05-07 2024-03-31 13F COSTAR GROUP COM 22160N109 112,320 93 0.08 10,850 10.64 0.0751
2024-01-24 2023-12-31 13F COSTAR GROUP COM 22160N109 112,227 770 0.69 9,808 14.45 0.0744
2023-11-07 2023-09-30 13F COSTAR GROUP COM 22160N109 111,457 445 0.40 8,570 -13.27 0.0728
2023-08-01 2023-06-30 13F COSTAR GROUP COM 22160N109 111,012 -7,224 -6.11 9,880 21.38 0.0802
2023-04-27 2023-03-31 13F COSTAR GROUP COM 22160N109 118,236 6,160 5.50 8,141 -6.02 0.0731
2023-02-08 2022-12-31 13F COSTAR GROUP COM 22160N109 112,076 3,285 3.02 8,661 14.31 0.0836
2022-11-07 2022-09-30 13F COSTAR GROUP COM 22160N109 108,791 -1,447 -1.31 7,577 13.79 0.0784
2022-07-28 2022-06-30 13F COSTAR GROUP COM 22160N109 110,238 305 0.28 6,659 -9.07 0.0646
2022-05-04 2022-03-31 13F COSTAR GROUP COM 22160N109 109,933 2,401 2.23 7,323 -13.83 0.0590
2022-02-04 2021-12-31 13F COSTAR GROUP COM 22160N109 107,532 -3,302 -2.98 8,498 -10.90 0.0647
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 110,834 -556 -0.50 9,538 3.39 0.0778
2021-08-02 2021-06-30 13F COSTAR GROUP COM 22160N109 111,390 100,025 880.11 9,225 -1.24 0.0750
2021-05-06 2021-03-31 13F COSTAR GROUP COM 22160N109 11,365 77 0.68 9,341 -10.47 0.0816
2021-01-28 2020-12-31 13F COSTAR GROUP COM 22160N109 11,288 -688 -5.74 10,433 2.67 0.0946
2020-11-05 2020-09-30 13F COSTAR GROUP COM 22160N109 11,976 2,907 32.05 10,162 57.67 0.1010
2020-08-04 2020-06-30 13F COSTAR GROUP COM 22160N109 9,069 -4,992 -35.50 6,445 -21.95 0.0909
2020-05-05 2020-03-31 13F COSTAR GROUP COM 22160N109 14,061 -2,230 -13.69 8,257 -15.29 0.1419
2020-01-27 2019-12-31 13F COSTAR GROUP COM 22160N109 16,291 938 6.11 9,747 7.03 0.1174
2019-10-31 2019-09-30 13F COSTAR GROUP COM 22160N109 15,353 -257 -1.65 9,107 5.30 0.1111
2019-07-25 2019-06-30 13F COSTAR GROUP COM 22160N109 15,610 10,257 191.61 8,649 246.38 0.1001
2019-04-29 2019-03-31 13F COSTAR GROUP COM 22160N109 5,353 -35 -0.65 2,497 37.35 0.0297
2019-01-28 2018-12-31 13F COSTAR GROUP COM 22160N109 5,388 437 8.83 1,818 -12.76 0.0234
2018-10-29 2018-09-30 13F COSTAR GROUP COM 22160N109 4,951 -349 -6.58 2,084 -4.71 0.0197
2018-08-07 2018-06-30 13F COSTAR GROUP COM 22160N109 5,300 5,300 2,187 0.0220
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.