CoStar Group, Inc.
IT ˙ BIT ˙ US22160N1090
27,96 € 0,00 (0,00%)
2026-06-03
DEL PRIS
SecurityIT:1CSGP / CoStar Group, Inc.
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership185,487 shares
Latest Disclosed Value $ 7,482,546
Asset Management One Co., Ltd. reports 1.14% increase in ownership of 1CSGP / CoStar Group, Inc.

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 185,487 shares of CoStar Group, Inc. (IT:1CSGP) valued at $7,112,499 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 183,391 shares of CoStar Group, Inc.. This represents a change in shares of 1.14% during the quarter. The current value of the position is $5,186,217 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)
2026-05-08 2026-03-31 13F COSTAR GROUP COM 22160N109 185,487 2,096 1.14 7,483 -39.64 0.0221
2026-01-27 2025-12-31 13F COSTAR GROUP COM 22160N109 183,391 607 0.33 12,396 -19.62 0.0345
2025-10-22 2025-09-30 13F COSTAR GROUP COM 22160N109 182,784 3,390 1.89 15,421 6.92 0.0447
2025-07-31 2025-06-30 13F COSTAR GROUP COM 22160N109 179,394 -121,290 -40.34 14,423 -39.46 0.0452
2025-04-23 2025-03-31 13F COSTAR GROUP COM 22160N109 300,684 12,706 4.41 23,823 14.55 0.0824
2025-01-30 2024-12-31 13F COSTAR GROUP COM 22160N109 287,978 5,150 1.82 20,798 -2.53 0.0715
2024-10-30 2024-09-30 13F COSTAR GROUP COM 22160N109 282,828 32,302 12.89 21,337 14.88 0.0759
2024-07-18 2024-06-30 13F COSTAR GROUP COM 22160N109 250,526 -3,571 -1.41 18,574 -24.33 0.0711
2024-05-02 2024-03-31 13F COSTAR GROUP COM 22160N109 254,097 -8,057 -3.07 24,546 6.38 0.0946
2024-01-24 2023-12-31 13F COSTAR GROUP COM 22160N109 262,154 -5,661 -2.11 23,072 12.04 0.0929
2023-10-19 2023-09-30 13F COSTAR GROUP COM 22160N109 267,815 2,479 0.93 20,592 -12.80 0.0917
2023-07-31 2023-06-30 13F COSTAR GROUP COM 22160N109 265,336 -2,481 -0.93 23,615 28.07 0.1000
2023-04-25 2023-03-31 13F COSTAR GROUP COM 22160N109 267,817 10,978 4.27 18,439 -7.56 0.0836
2023-02-06 2022-12-31 13F COSTAR GROUP COM 22160N109 256,839 93,534 57.28 19,947 75.36 0.0972
2022-11-04 2022-09-30 13F COSTAR GROUP COM 22160N109 163,305 180 0.11 11,374 15.43 0.0579
2022-07-29 2022-06-30 13F COSTAR GROUP COM 22160N109 163,125 -5,123 -3.04 9,854 -12.06 0.0463
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 168,248 -132,444 -44.05 11,206 -53.32 0.0437
2022-02-09 2021-12-31 13F COSTAR GROUP COM 22160N109 300,692 -978 -0.32 24,005 -7.53 0.0836
2021-11-02 2021-09-30 13F COSTAR GROUP COM 22160N109 301,670 -2,424 -0.80 25,961 3.08 0.0995
2021-08-03 2021-06-30 13F COSTAR GROUP COM 22160N109 304,094 272,728 869.50 25,185 -2.30 0.0937
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 31,366 -679 -2.12 25,779 -12.40 0.1024
2021-02-12 2020-12-31 13F COSTAR GROUP COM 22160N109 32,045 -120 -0.37 29,429 7.82 0.1212
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 32,165 12,459 63.22 27,295 94.91 0.1255
2020-08-14 2020-06-30 13F COSTAR GROUP COM 22160N109 19,706 526 2.74 14,004 24.36 0.0689
2020-05-14 2020-03-31 13F COSTAR GROUP COM 22160N109 19,180 -245 -1.26 11,261 -3.11 0.0658
2020-02-14 2019-12-31 13F COSTAR GROUP COM 22160N109 19,425 -631 -3.15 11,622 -2.33 0.0524
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 20,056 -38 -0.19 11,899 6.88 0.0573
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 20,094 1,550 8.36 11,133 28.72 0.0547
2019-05-15 2019-03-31 13F COSTAR GROUP COM 22160N109 18,544 -40,188 -68.43 8,649 -56.36 0.0468
2019-02-13 2018-12-31 13F COSTAR GROUP COM 22160N109 58,732 -710 -1.19 19,817 -20.73 0.0472
2018-11-14 2018-09-30 13F COSTAR GROUP COM 22160N109 59,442 3,258 5.80 24,998 7.79 0.0513
2018-08-14 2018-06-30 13F COSTAR GROUP COM 22160N109 56,184 873 1.58 23,191 15.60 0.0507
2018-05-14 2018-03-31 13F COSTAR GROUP COM 22160N109 55,311 810 1.49 20,061 23.98 0.0452
2018-02-14 2017-12-31 13F COSTAR GROUP COM 22160N109 54,501 6,457 13.44 16,181 25.60 0.0357
2017-11-14 2017-09-30 13F COSTAR GROUP COM 22160N109 48,044 103 0.21 12,883 2.01 0.0302
2017-08-14 2017-06-30 13F COSTAR GROUP COM 22160N109 47,941 3,112 6.94 12,629 35.97 0.0322
2017-05-11 2017-03-31 13F COSTAR GROUP COM 22160N109 44,829 -3,649 -7.53 9,288 1.69 0.0244
2017-05-02 2016-12-31 13F/A-1 COSTAR GROUP COM 22160N109 48,478 30,536 170.19 9,134 135.59 0.0233
2017-02-13 2016-12-31 13F COSTAR GROUP COM 22160N109 48,478 9,134
2016-11-07 2016-09-30 13F COSTAR GROUP COM 22160N109 17,942 -1,108 -5.82 3,877 -4.11 0.0576
2016-08-03 2016-06-30 13F COSTAR GROUP COM 22160N109 19,050 1,413 8.01 4,043 22.92 0.0607
2016-05-05 2016-03-31 13F COSTAR GROUP COM 22160N109 17,637 1,801 11.37 3,289 -1.29 0.0480
2016-01-28 2015-12-31 13F COSTAR GROUP COM 22160N109 15,836 3,865 32.29 3,332 69.22 0.0497
2015-11-12 2015-09-30 13F COSTAR GROUP COM 22160N109 11,971 -1,947 -13.99 1,969 -29.78 0.0300
2015-08-06 2015-06-30 13F COSTAR GROUP COM 22160N109 13,918 -2,495 -15.20 2,804 -13.54 0.0389
2015-05-11 2015-03-31 13F COSTAR GROUP COM 22160N109 16,413 -1,577 -8.77 3,243 -2.47 0.0400
2015-02-09 2014-12-31 13F COSTAR GROUP COM 22160N109 17,990 13,216 276.83 3,325 347.51 0.0432
2014-11-05 2014-09-30 13F COSTAR GROUP COM 22160N109 4,774 840 21.35 743 1.50 0.0103
2014-05-05 2014-03-31 13F COSTAR GROUP Com 22160N109 3,934 -758 -16.16 732 -15.28 0.0115
2014-02-05 2013-12-31 13F/A-1 COSTAR GROUP COM 22160N109 4,692 -147 -3.04 864 6.93 0.0134
2014-01-29 2013-12-31 13F COSTAR GROUP COM 22160N109 4,692 864
2014-02-05 2013-09-30 13F/A-1 COSTAR GROUP COM 22160N109 4,839 21 0.44 808 29.90 0.0122
2013-11-06 2013-09-30 13F COSTAR GROUP Com 22160N109 4,839 808
2014-02-12 2013-06-30 13F/A-1 COSTAR GROUP COM 22160N109 4,818 4,818 622 0.0101
2013-08-05 2013-06-30 13F COSTAR GROUP Com 22160N109 4,818 622
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.