CoStar Group, Inc.
IT ˙ BIT ˙ US22160N1090
27,96 € 0,00 (0,00%)
2026-06-03
DEL PRIS
SecurityIT:1CSGP / CoStar Group, Inc.
InstitutionBlackRock, Inc.
Latest Disclosed Ownership31,820,259 shares
Ownership 7.50%
BlackRock, Inc. ownership in 1CSGP / CoStar Group, Inc.

2025-04-23 - BlackRock, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 31,820,259 shares of CoStar Group, Inc. (IT:1CSGP). This represents 7.5 percent ownership of the company. In their previous filing dated 2024-01-25 , BlackRock, Inc. had reported owning 36,527,249 shares, indicating a decrease of -12.89 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2025-04-23 2025-04-23 13G/A 36,527,249 31,820,259 -12.89 7.50 -15.73
2024-01-25 2024-01-25 13G/A 31,629,923 36,527,249 15.48 8.90 14.10
2023-01-30 2023-01-30 13G/A 23,945,281 31,629,923 32.09 7.80 27.87
2022-02-01 2022-02-01 13G/A 3,500,291 23,945,281 584.09 6.10 -31.46
2021-01-29 2021-01-29 13G/A 3,272,405 3,500,291 6.96 8.90 0.00
2020-02-05 2020-02-05 13G/A 3,061,248 3,272,405 6.90 8.90 5.95
2019-02-08 2019-02-08 13G 3,061,248 3,061,248 0.00 8.40 0.00
2019-02-07 2019-02-07 13G 3,061,248 8.40
2014-07-10 2014-07-10 13G/A 1,017,259 3.20
2014-01-28 2014-01-28 13G/A 1,638,758 5.70
2013-02-06 2013-02-06 13G/A 1,849,591 6.55
2012-02-09 2012-02-09 13G 1,327,155 5.24

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-05-13 2026-03-31 13F COSTAR GROUP COM 22160N109 33,808,184 -162,442 -0.48 1,363,822 -40.29 0.0018
2026-02-12 2025-12-31 13F COSTAR GROUP COM 22160N109 33,970,626 -2,162,532 -5.98 2,284,185 -25.07 0.0386
2025-11-12 2025-09-30 13F COSTAR GROUP COM 22160N109 36,133,158 1,093,724 3.12 3,048,555 8.21 0.0534
2025-08-12 2025-06-30 13F COSTAR GROUP COM 22160N109 35,039,434 -2,418,184 -6.46 2,817,170 -5.07 0.0536
2025-05-02 2025-03-31 13F COSTAR GROUP COM 22160N109 37,457,618 -658,076 -1.73 2,967,767 8.76 0.0623
2025-02-07 2024-12-31 13F COSTAR GROUP COM 22160N109 38,115,694 -770,199 -1.98 2,728,703 -6.98 0.0552
2024-11-13 2024-09-30 13F COSTAR GROUP COM 22160N109 38,885,893 324,808 0.84 2,933,552 2.61 0.0616
2024-08-13 2024-06-30 13F COSTAR GROUP COM 22160N109 38,561,085 -325,365 -0.84 2,858,919 -23.89 0.0647
2024-05-10 2024-03-31 13F COSTAR GROUP COM 22160N109 38,886,450 2,358,559 6.46 3,756,431 17.68 0.0874
2024-02-13 2023-12-31 13F COSTAR GROUP COM 22160N109 36,527,891 3,352,400 10.11 3,192,172 25.14 0.0814
2023-11-13 2023-09-30 13F COSTAR GROUP COM 22160N109 33,175,491 1,051,260 3.27 2,550,864 -10.78 0.0734
2023-08-11 2023-06-30 13F COSTAR GROUP COM 22160N109 32,124,231 206,764 0.65 2,859,057 30.10 0.0788
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 31,917,467 286,782 0.91 2,197,518 -10.10 0.0648
2023-02-13 2022-12-31 13F COSTAR GROUP COM 22160N109 31,630,685 2,996,824 10.47 2,444,419 22.57 0.0766
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 28,633,861 8,470,338 42.01 1,994,349 63.73 0.0678
2022-08-12 2022-06-30 13F COSTAR GROUP COM 22160N109 20,163,523 -451,729 -2.19 1,218,077 -11.30 0.0391
2022-05-12 2022-03-31 13F COSTAR GROUP COM 22160N109 20,615,252 -3,330,029 -13.91 1,373,180 -27.44 0.0370
2022-02-10 2021-12-31 13F COSTAR GROUP COM 22160N109 23,945,281 -547,386 -2.23 1,892,398 -10.22 0.0482
2021-11-09 2021-09-30 13F COSTAR GROUP COM 22160N109 24,492,667 -1,399,282 -5.40 2,107,840 -1.70 0.0590
2021-08-11 2021-06-30 13F COSTAR GROUP COM 22160N109 25,891,949 22,839,557 748.25 2,144,369 -14.52 0.0597
2021-05-07 2021-03-31 13F COSTAR GROUP COM 22160N109 3,052,392 -447,899 -12.80 2,508,730 -22.46 0.0737
2021-02-05 2020-12-31 13F COSTAR GROUP COM 22160N109 3,500,291 154,093 4.61 3,235,249 13.95 0.1032
2020-11-06 2020-09-30 13F COSTAR GROUP COM 22160N109 3,346,198 -33,316 -0.99 2,839,282 18.22 0.1048
2020-08-14 2020-06-30 13F COSTAR GROUP COM 22160N109 3,379,514 406,587 13.68 2,401,719 37.58 0.0959
2020-05-01 2020-03-31 13F COSTAR GROUP COM 22160N109 2,972,927 -299,478 -9.15 1,745,735 -10.84 0.0854
2020-02-13 2019-12-31 13F COSTAR GROUP COM 22160N109 3,272,405 -202,025 -5.81 1,957,877 -5.01 0.0751
2019-11-08 2019-09-30 13F COSTAR GROUP COM 22160N109 3,474,430 -56,841 -1.61 2,061,033 5.34 0.0866
2019-08-22 2019-06-30 13F/A-1 COSTAR GROUP COM 22160N109 3,531,271 445,078 14.42 1,956,536 35.92 0.0837
2019-08-13 2019-06-30 13F COSTAR GROUP COM 22160N109 3,531,271 445,078 1,956,536
2019-05-09 2019-03-31 13F COSTAR GROUP COM 22160N109 3,086,193 24,945 0.81 1,439,461 39.39 0.0643
2019-02-08 2018-12-31 13F COSTAR GROUP COM 22160N109 3,061,248 200,620 7.01 1,032,680 -14.22 0.0521
2018-11-09 2018-09-30 13F COSTAR GROUP COM 22160N109 2,860,628 39,951 1.42 1,203,866 3.43 0.0521
2018-08-09 2018-06-30 13F COSTAR GROUP COM 22160N109 2,820,677 252,916 9.85 1,163,897 24.98 0.0536
2018-05-09 2018-03-31 13F COSTAR GROUP COM 22160N109 2,567,761 773,285 43.09 931,275 74.77 0.0445
2018-02-09 2017-12-31 13F COSTAR GROUP COM 22160N109 1,794,476 199,267 12.49 532,869 24.53 0.0254
2017-11-14 2017-09-30 13F COSTAR GROUP COM 22160N109 1,595,209 40,743 2.62 427,911 4.43 0.0216
2017-08-10 2017-06-30 13F COSTAR GROUP COM 22160N109 1,554,466 7,555 0.49 409,755 27.83 0.0217
2017-05-12 2017-03-31 13F COSTAR GROUP COM 22160N109 1,546,911 1,517,301 5,124.29 320,551 5,643.61 0.0176
2017-02-10 2016-12-31 13F COSTAR GROUP COM 22160N109 29,610 24,627 494.22 5,581 417.24 0.0079
2016-11-08 2016-09-30 13F COSTAR GROUP COM 22160N109 4,983 777 18.47 1,079 17.28 0.0015
2016-08-10 2016-06-30 13F COSTAR GROUP COM 22160N109 4,206 454 12.10 920 30.31 0.0014
2016-05-10 2016-03-31 13F COSTAR GROUP COM 22160N109 3,752 2,924 353.14 706 312.87 0.0011
2016-02-11 2015-12-31 13F COSTAR GROUP COM 22160N109 828 100 13.74 171 35.71 0.0003
2015-11-13 2015-09-30 13F COSTAR GROUP COM 22160N109 728 -118 -13.95 126 -25.88 0.0002
2015-08-07 2015-06-30 13F COSTAR GROUP COM 22160N109 846 18 2.17 170 4.29 0.0003
2015-05-13 2015-03-31 13F COSTAR GROUP COM 22160N109 828 0 0.00 163 7.24 0.0002
2015-02-09 2014-12-31 13F COSTAR GROUP COM 22160N109 828 26 3.24 152 21.60 0.0002
2014-10-29 2014-09-30 13F COSTAR GROUP COM 22160N109 802 16 2.04 125 0.81 0.0002
2014-08-06 2014-06-30 13F COSTAR GROUP COM 22160N109 786 -402 -33.84 124 -44.14 0.0002
2014-05-02 2014-03-31 13F COSTAR GROUP COM 22160N109 1,188 274 29.98 222 31.36 0.0004
2014-02-12 2013-12-31 13F COSTAR GROUP COM 22160N109 914 -26 -2.77 169 6.96 0.0003
2013-11-12 2013-09-30 13F COSTAR GROUP COM 22160N109 940 24 2.62 158 33.90 0.0003
2013-08-13 2013-06-30 13F COSTAR GROUP COM 22160N109 916 916 118 0.0002
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.