CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DIESES SYMBOL IST NICHT MEHR AKTIV
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionBaird Financial Group, Inc.
Latest Disclosed Ownership10,736 shares
Latest Disclosed Value $ 433,091
Baird Financial Group, Inc. reports 42.13% decrease in ownership of CSGP / CoStar Group, Inc.

On May 14, 2026 - Baird Financial Group, Inc. filed a 13F-HR form disclosing ownership of 10,736 shares of CoStar Group, Inc. (MX:CSGP) valued at $433,091 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 18,552 shares of CoStar Group, Inc.. This represents a change in shares of -42.13% 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)
2026-05-14 2026-03-31 13F COSTAR GROUP COM 22160N109 10,736 -7,816 -42.13 433 -65.28 0.0004
2026-02-13 2025-12-31 13F COSTAR GROUP INC COM COMMON 22160N109 18,552 -688,992 -97.38 1,247 -97.91 0.0019
2025-11-13 2025-09-30 13F COSTAR GROUP COMMON 22160N109 707,544 -213,224 -23.16 59,695 -19.36 0.0960
2025-08-13 2025-06-30 13F COSTAR GROUP INC COM COMMON 22160N109 920,768 -41,500 -4.31 74,030 -2.90 0.1298
2025-05-15 2025-03-31 13F COSTAR GROUP INC COM COMMON 22160N109 962,268 -106,953 -10.00 76,240 -0.40 0.1468
2025-02-14 2024-12-31 13F COSTAR GROUP COMMON 22160N109 1,069,221 -63,465 -5.60 76,546 -10.42 0.1464
2024-11-14 2024-09-30 13F COSTAR GROUP COMMON 22160N109 1,132,686 -109,517 -8.82 85,450 -7.22 0.1659
2024-08-14 2024-06-30 13F COSTAR GROUP COMMON 22160N109 1,242,203 103,662 9.10 92,097 -16.26 0.1910
2024-05-14 2024-03-31 13F COSTAR GROUP COMMON 22160N109 1,138,541 -8,848 -0.77 109,983 9.69 0.2306
2024-02-14 2023-12-31 13F COSTAR GROUP COMMON 22160N109 1,147,389 283,927 32.88 100,270 51.03 0.2285
2023-11-13 2023-09-30 13F COSTAR GROUP COMMON 22160N109 863,462 -275,745 -24.20 66,392 -34.52 0.1811
2023-08-11 2023-06-30 13F COSTAR GROUP COMMON 22160N109 1,139,207 213,022 23.00 101,389 59.00 0.2676
2023-05-15 2023-03-31 13F COSTAR GROUP COMMON 22160N109 926,185 2,577 0.28 63,768 89,712.68 0.1573
2023-02-13 2022-12-31 13F COSTAR GROUP COMMON 22160N109 923,608 -247,747 -21.15 71 -99.91 0.1880
2022-11-15 2022-09-30 13F COSTAR GROUP COMMON 22160N109 1,171,355 49,089 4.37 81,585 20.34 0.2404
2022-08-08 2022-06-30 13F COSTAR GROUP COMMON 22160N109 1,122,266 237,323 26.82 67,797 15.02 0.1882
2022-05-13 2022-03-31 13F COSTAR GROUP COMMON 22160N109 884,943 36,835 4.34 58,946 -12.06 0.1457
2022-02-09 2021-12-31 13F COSTAR GROUP INC COM COMMON 22160N109 848,108 -23,706 -2.72 67,026 -10.67 0.1567
2021-11-12 2021-09-30 13F COSTAR GROUP INC COM COMMON 22160N109 871,814 2,795 0.32 75,028 4.25 0.1919
2021-08-11 2021-06-30 13F COSTAR GROUP COMMON 22160N109 869,019 790,158 1,001.96 71,972 11.04 0.1871
2021-05-13 2021-03-31 13F COSTAR GROUP COMMON 22160N109 78,861 -4,776 -5.71 64,815 -16.16 0.1818
2021-02-11 2020-12-31 13F COSTAR GROUP COMMON 22160N109 83,637 32,349 63.07 77,304 77.64 0.2311
2020-11-12 2020-09-30 13F COSTAR GROUP COMMON 22160N109 51,288 -1,795 -3.38 43,518 15.36 0.1491
2020-10-22 2020-06-30 13F/A-1 COSTAR GROUP COMMON 22160N109 53,083 49,970 1,605.20 37,724 1,963.68 0.1421
2020-05-14 2020-03-31 13F COSTAR GROUP COMMON 22160N109 3,113 3,113 1,828 0.0083
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.