CoStar Group, Inc.
IT ˙ BIT ˙ US22160N1090
27,96 € 0,00 (0,00%)
2026-06-03
DEL PRIS
SecurityIT:1CSGP / CoStar Group, Inc.
InstitutionAviva Plc
Latest Disclosed Ownership243,053 shares
Latest Disclosed Value $ 9,804,758
Aviva Plc reports 13.88% decrease in ownership of 1CSGP / CoStar Group, Inc.

On May 14, 2026 - Aviva Plc filed a 13F-HR form disclosing ownership of 243,053 shares of CoStar Group, Inc. (IT:1CSGP) valued at $9,319,867 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 282,218 shares of CoStar Group, Inc.. This represents a change in shares of -13.88% during the quarter. The current value of the position is $6,795,762 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-14 2026-03-31 13F COSTAR GROUP COM 22160N109 243,053 -39,165 -13.88 9,805 -48.33 0.0164
2026-02-12 2025-12-31 13F COSTAR GROUP COM 22160N109 282,218 13,968 5.21 18,976 -16.15 0.0320
2025-11-13 2025-09-30 13F COSTAR GROUP COM 22160N109 268,250 16,195 6.43 22,632 11.68 0.0411
2025-08-07 2025-06-30 13F COSTAR GROUP COM 22160N109 252,055 236,048 1,474.65 20,265 1,498.19 0.0418
2025-05-15 2025-03-31 13F COSTAR GROUP COM 22160N109 16,007 373 2.39 1,268 13.32 0.0031
2025-02-13 2024-12-31 13F COSTAR GROUP COM 22160N109 15,634 -45 -0.29 1,119 -5.33 0.0029
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 15,679 224 1.45 1,183 3.23 0.0031
2024-08-02 2024-06-30 13F COSTAR GROUP COM 22160N109 15,455 -5,037 -24.58 1,146 -42.14 0.0032
2024-05-14 2024-03-31 13F COSTAR GROUP COM 22160N109 20,492 -18,672 -47.68 1,980 -42.17 0.0065
2024-02-09 2023-12-31 13F COSTAR GROUP COM 22160N109 39,164 16,279 71.13 3,423 94.54 0.0123
2023-11-13 2023-09-30 13F COSTAR GROUP COM 22160N109 22,885 -9,913 -30.22 1,760 -39.74 0.0074
2023-08-10 2023-06-30 13F COSTAR GROUP COM 22160N109 32,798 -51,780 -61.22 2,919 -49.87 0.0119
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 84,578 -53,832 -38.89 5,823 -45.56 0.0264
2023-02-14 2022-12-31 13F/A-2 COSTAR GROUP COM 22160N109 138,410 -28,835 -17.24 10,696 -8.18 0.0526
2023-02-10 2022-12-31 13F/A-1 COSTAR GROUP COM 22160N109 138,410 -28,835 104,136 0.4965
2023-02-09 2022-12-31 13F COSTAR GROUP COM 22160N109 138,410 -28,835 11 0.0514
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 167,245 -2,366 -1.39 11,649 13.69 0.0671
2022-08-04 2022-06-30 13F COSTAR GROUP COM 22160N109 169,611 76,771 82.69 10,246 65.69 0.0545
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 92,840 -27,794 -23.04 6,184 -35.14 0.0309
2022-02-10 2021-12-31 13F COSTAR GROUP COM 22160N109 120,634 915 0.76 9,534 -7.46 0.0400
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 119,719 -6,208 -4.93 10,303 -1.21 0.0460
2021-08-10 2021-06-30 13F COSTAR GROUP COM 22160N109 125,927 111,492 772.37 10,429 -12.10 0.0457
2021-05-13 2021-03-31 13F COSTAR GROUP COM 22160N109 14,435 14 0.10 11,864 -10.99 0.0580
2021-02-10 2020-12-31 13F COSTAR GROUP COM 22160N109 14,421 -871 -5.70 13,329 2.73 0.0693
2020-11-12 2020-09-30 13F COSTAR GROUP COM 22160N109 15,292 -762 -4.75 12,975 13.73 0.0765
2020-08-13 2020-06-30 13F/A-1 COSTAR GROUP COM 22160N109 16,054 -2,759 -14.67 11,409 3.28 0.0711
2020-08-13 2020-06-30 13F COSTAR GROUP COM 22160N109 16,054 -2,759 11,409 34,539.9363
2020-05-14 2020-03-31 13F COSTAR GROUP COM 22160N109 18,813 2,996 18.94 11,047 16.74 0.0809
2020-02-10 2019-12-31 13F COSTAR GROUP COM 22160N109 15,817 3,153 24.90 9,463 25.97 0.0573
2019-11-12 2019-09-30 13F COSTAR GROUP COM 22160N109 12,664 -540 -4.09 7,512 2.68 0.0509
2019-07-30 2019-06-30 13F COSTAR GROUP COM 22160N109 13,204 -281 -2.08 7,316 16.31 0.0503
2019-05-14 2019-03-31 13F COSTAR GROUP COM 22160N109 13,485 103 0.77 6,290 39.34 0.0422
2019-02-12 2018-12-31 13F COSTAR GROUP COM 22160N109 13,382 -3,904 -22.58 4,514 -37.95 0.0337
2018-11-13 2018-09-30 13F COSTAR GROUP COM 22160N109 17,286 -459 -2.59 7,275 -0.64 0.0399
2018-08-01 2018-06-30 13F COSTAR GROUP COM 22160N109 17,745 90 0.51 7,322 14.35 0.0432
2018-05-14 2018-03-31 13F COSTAR GROUP COM 22160N109 17,655 17,655 6,403 0.0392
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.