CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionNissay Asset Management Corp /japan/ /adv
Latest Disclosed Ownership117,937 shares
Latest Disclosed Value $ 4,757,579
Nissay Asset Management Corp /japan/ /adv reports 2.61% increase in ownership of CSGP / CoStar Group, Inc.

On May 15, 2026 - Nissay Asset Management Corp /japan/ /adv filed a 13F-HR form disclosing ownership of 117,937 shares of CoStar Group, Inc. (MX:CSGP) valued at $4,757,579 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 114,942 shares of CoStar Group, Inc.. This represents a change in shares of 2.61% 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 117,937 2,995 2.61 4,758 -38.44 0.0252
2026-02-17 2025-12-31 13F COSTAR GROUP COM 22160N109 114,942 5,827 5.34 7,729 -16.05 0.0402
2025-11-14 2025-09-30 13F COSTAR GROUP COM 22160N109 109,115 2,103 1.97 9,206 7.01 0.0508
2025-08-14 2025-06-30 13F COSTAR GROUP COM 22160N109 107,012 5,765 5.69 8,604 7.26 0.0504
2025-05-15 2025-03-31 13F COSTAR GROUP COM 22160N109 101,247 9,138 9.92 8,022 20.58 0.0521
2025-02-14 2024-12-31 13F COSTAR GROUP COM 22160N109 92,109 3,665 4.14 6,652 -0.30 0.0406
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 88,444 7,305 9.00 6,672 10.92 0.0422
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 81,139 8,669 11.96 6,016 -14.07 0.0398
2024-05-15 2024-03-31 13F COSTAR GROUP COM 22160N109 72,470 17,403 31.60 7,001 45.47 0.0485
2024-02-14 2023-12-31 13F COSTAR GROUP COM 22160N109 55,067 4,914 9.80 4,812 24.79 0.0387
2023-11-14 2023-09-30 13F COSTAR GROUP COM 22160N109 50,153 3,867 8.35 3,856 -6.39 0.0342
2023-08-14 2023-06-30 13F COSTAR GROUP COM 22160N109 46,286 -380 -0.81 4,119 28.24 0.0355
2023-05-15 2023-03-31 13F COSTAR GROUP COM 22160N109 46,666 -176,261 -79.07 3,213 -81.35 0.0287
2023-02-14 2022-12-31 13F COSTAR GROUP COM 22160N109 222,927 -8,688 -3.75 17,228 6.79 0.1647
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 231,615 -1,692 -0.73 16,132 14.46 0.1694
2022-08-15 2022-06-30 13F COSTAR GROUP COM 22160N109 233,307 11,982 5.41 14,094 -4.40 0.1403
2022-05-16 2022-03-31 13F COSTAR GROUP COM 22160N109 221,325 -117,587 -34.70 14,742 -44.96 0.1284
2022-02-14 2021-12-31 13F COSTAR GROUP COM 22160N109 338,912 17,340 5.39 26,784 -3.22 0.2052
2021-11-10 2021-09-30 13F COSTAR GROUP COM 22160N109 321,572 19,892 6.59 27,674 10.76 0.2345
2021-08-13 2021-06-30 13F COSTAR GROUP COM 22160N109 301,680 266,454 756.41 24,985 -13.70 0.2193
2021-05-11 2021-03-31 13F COSTAR GROUP COM 22160N109 35,226 4,346 14.07 28,952 1.44 0.2854
2021-02-08 2020-12-31 13F COSTAR GROUP COM 22160N109 30,880 2,611 9.24 28,542 18.99 0.4291
2020-10-20 2020-09-30 13F COSTAR GROUP COM 22160N109 28,269 22,958 432.27 23,987 535.59 0.4052
2020-07-27 2020-06-30 13F COSTAR GROUP COM 22160N109 5,311 -142 -2.60 3,774 17.86 0.0732
2020-05-05 2020-03-31 13F COSTAR GROUP COM 22160N109 5,453 87 1.62 3,202 -0.25 0.0815
2020-02-14 2019-12-31 13F COSTAR GROUP COM 22160N109 5,366 -96 -1.76 3,210 -0.93 0.0713
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 5,462 251 4.82 3,240 12.23 0.0802
2019-08-07 2019-06-30 13F COSTAR GROUP COM 22160N109 5,211 2,140 69.68 2,887 101.61 0.0730
2019-05-03 2019-03-31 13F COSTAR GROUP COM 22160N109 3,071 140 4.78 1,432 44.79 0.0378
2019-02-06 2018-12-31 13F COSTAR GROUP COM 22160N109 2,931 -30 -1.01 989 -20.63 0.0301
2018-10-30 2018-09-30 13F COSTAR GROUP COM 22160N109 2,961 104 3.64 1,246 5.68 0.0335
2018-08-08 2018-06-30 13F COSTAR GROUP COM 22160N109 2,857 125 4.58 1,179 18.97 0.0345
2018-05-14 2018-03-31 13F COSTAR GROUP COM 22160N109 2,732 67 2.51 991 25.28 0.0310
2018-02-14 2017-12-31 13F COSTAR GROUP COM 22160N109 2,665 2,665 791 0.0241
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.