CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DIESES SYMBOL IST NICHT MEHR AKTIV
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionLegal & General Group Plc
Latest Disclosed Ownership3,025,508 shares
Latest Disclosed Value $ 122,048,995
Legal & General Group Plc reports 5.74% increase in ownership of CSGP / CoStar Group, Inc.

On May 8, 2026 - Legal & General Group Plc filed a 13F-HR form disclosing ownership of 3,025,508 shares of CoStar Group, Inc. (MX:CSGP) valued at $122,048,995 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 2,861,300 shares of CoStar Group, Inc.. This represents a change in shares of 5.74% 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)
2026-05-08 2026-03-31 13F COSTAR GROUP COM 22160N109 3,025,508 164,208 5.74 122,049 -36.56 0.0282
2026-02-09 2025-12-31 13F COSTAR GROUP COM 22160N109 2,861,300 161,543 5.98 192,394 -15.53 0.0427
2025-11-13 2025-09-30 13F COSTAR GROUP COM 22160N109 2,699,757 195,200 7.79 227,778 13.12 0.0511
2025-08-12 2025-06-30 13F COSTAR GROUP COM 22160N109 2,504,557 120,682 5.06 201,366 6.61 0.0500
2025-05-15 2025-03-31 13F COSTAR GROUP COM 22160N109 2,383,875 75,522 3.27 188,874 14.29 0.0514
2025-02-13 2024-12-31 13F COSTAR GROUP COM 22160N109 2,308,353 -42,894 -1.82 165,255 -6.84 0.0437
2025-02-28 2024-09-30 13F/A-2 COSTAR GROUP COM 22160N109 2,351,247 56,539 2.46 177,378 4.26 0.0467
2024-11-14 2024-09-30 13F/A-1 COSTAR GROUP COM 22160N109 2,914,298 61,259 219,855 0.0458
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 2,914,298 61,259 219,855 0.0231
2025-05-29 2024-06-30 13F/A-1 COSTAR GROUP COM 22160N109 2,294,708 23,439 1.03 170,130 -22.46 0.0481
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 2,853,039 20,704 211,524 0.0473
2025-05-29 2024-03-31 13F/A-2 COSTAR GROUP COM 22160N109 2,271,269 44,257 1.99 219,404 12.74 0.0632
2024-07-01 2024-03-31 13F/A-1 COSTAR GROUP COM 22160N109 2,832,335 39,884 273,603 0.0639
2024-05-14 2024-03-31 13F COSTAR GROUP COM 22160N109 2,832,335 39,884 273,603 0.0329
2025-05-29 2023-12-31 13F/A-1 COSTAR GROUP COM 22160N109 2,227,012 6,292 0.28 194,619 13.98 0.0605
2024-02-15 2023-12-31 13F COSTAR GROUP COM 22160N109 2,792,451 571,731 244,033 0.0626
2023-11-14 2023-09-30 13F COSTAR GROUP COM 22160N109 2,220,720 -109,787 -4.71 170,751 -17.68 0.0596
2023-08-14 2023-06-30 13F COSTAR GROUP COM 22160N109 2,330,507 -14,144 -0.60 207,416 28.49 0.0675
2023-05-15 2023-03-31 13F COSTAR GROUP COM 22160N109 2,344,651 119,622 5.38 161,429 -6.12 0.0577
2023-02-14 2022-12-31 13F COSTAR GROUP COM 22160N109 2,225,029 -84,784 -3.67 171,950 6.88 0.0660
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 2,309,813 75,964 3.40 160,879 19.22 0.0629
2022-08-22 2022-06-30 13F COSTAR GROUP COM 22160N109 2,233,849 32,937 1.50 134,947 -7.95 0.0478
2022-05-16 2022-03-31 13F COSTAR GROUP COM 22160N109 2,200,912 170,702 8.41 146,602 -8.63 0.0446
2022-02-14 2021-12-31 13F COSTAR GROUP COM 22160N109 2,030,210 -128,148 -5.94 160,448 -13.62 0.0485
2021-11-15 2021-09-30 13F COSTAR GROUP COM 22160N109 2,158,358 -51,432 -2.33 185,749 1.49 0.0604
2021-08-12 2021-06-30 13F COSTAR GROUP COM 22160N109 2,209,790 1,968,733 816.71 183,015 -7.63 0.0612
2021-05-17 2021-03-31 13F COSTAR GROUP COM 22160N109 241,057 -1,948 -0.80 198,129 -11.79 0.0738
2021-02-12 2020-12-31 13F COSTAR GROUP COM 22160N109 243,005 5,596 2.36 224,605 11.50 0.0880
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 237,409 448 0.19 201,437 19.67 0.0900
2020-08-14 2020-06-30 13F COSTAR GROUP COM 22160N109 236,961 -5,096 -2.11 168,334 18.42 0.0813
2020-05-14 2020-03-31 13F COSTAR GROUP COM 22160N109 242,057 14,347 6.30 142,148 4.34 0.0831
2020-02-13 2019-12-31 13F COSTAR GROUP COM 22160N109 227,710 4,911 2.20 136,230 10.42 0.0649
2019-08-14 2019-06-30 13F COSTAR GROUP COM 22160N109 222,799 22,660 11.32 123,376 32.17 0.0664
2019-05-15 2019-03-31 13F COSTAR GROUP COM 22160N109 200,139 44,588 28.66 93,349 77.90 0.0533
2019-02-15 2018-12-31 13F COSTAR GROUP COM 22160N109 155,551 11,749 8.17 52,474 -13.29 0.0407
2018-11-20 2018-09-30 13F COSTAR GROUP COM 22160N109 143,802 4,916 3.54 60,518 5.60 0.0433
2018-08-10 2018-06-30 13F COSTAR GROUP COM 22160N109 138,886 -482 -0.35 57,308 13.38 0.0442
2018-05-17 2018-03-31 13F COSTAR GROUP COM 22160N109 139,368 97,770 235.04 50,546 309.18 0.0386
2018-02-13 2017-12-31 13F COSTAR GROUP COM 22160N109 41,598 6,738 19.33 12,353 32.09 0.0089
2017-11-09 2017-09-30 13F COSTAR GROUP COM 22160N109 34,860 2,327 7.15 9,352 9.05 0.0070
2017-08-03 2017-06-30 13F COSTAR GROUP COM 22160N109 32,533 2,324 7.69 8,576 37.00 0.0069
2017-05-12 2017-03-31 13F COSTAR GROUP COM 22160N109 30,209 9,589 46.50 6,260 61.09 0.0053
2017-02-13 2016-12-31 13F COSTAR GROUP COM 22160N109 20,620 17,592 580.98 3,886 492.38 0.0036
2016-10-12 2016-09-30 13F COSTAR GROUP COM 22160N109 3,028 450 17.46 656 16.31 0.0007
2016-08-16 2016-06-30 13F COSTAR GROUP COM 22160N109 2,578 340 15.19 564 33.97 0.0006
2016-05-16 2016-03-31 13F COSTAR GROUP COM 22160N109 2,238 390 21.10 421 10.21 0.0005
2016-02-16 2015-12-31 13F COSTAR GROUP COM 22160N109 1,848 304 19.69 382 43.07 0.0004
2015-11-13 2015-09-30 13F COSTAR GROUP COM 22160N109 1,544 265 20.72 267 3.89 0.0003
2015-07-31 2015-06-30 13F COSTAR GROUP COM 22160N109 1,279 281 28.16 257 30.46 0.0003
2015-05-14 2015-03-31 13F COSTAR GROUP COM 22160N109 998 998 197 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.