CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionCandriam Luxembourg S.C.A.
Latest Disclosed Ownership21,512 shares
Latest Disclosed Value $ 867,794
Candriam Luxembourg S.C.A. reports 14.80% increase in ownership of CSGP / CoStar Group, Inc.

On April 30, 2026 - Candriam Luxembourg S.C.A. filed a 13F-HR form disclosing ownership of 21,512 shares of CoStar Group, Inc. (MX:CSGP) valued at $867,794 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on April 30, 2026 disclosing 18,739 shares of CoStar Group, Inc.. This represents a change in shares of 14.80% 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)
2026-04-30 2026-03-31 13F COSTAR GROUP COM 22160N109 21,512 2,773 14.80 868 -31.19 0.0045
2026-04-30 2025-12-31 13F/A-1 COSTAR GROUP COM 22160N109 18,739 -6,905 -26.93 1,260 -41.75 0.0063
2026-02-13 2025-12-31 13F COSTAR GROUP COM 22160N109 18,739 -6,905 1,260 0.0063
2025-11-06 2025-09-30 13F COSTAR GROUP COM 22160N109 25,644 6,006 30.58 2,164 37.07 0.0113
2025-08-08 2025-06-30 13F COSTAR GROUP COM 22160N109 19,638 2,833 16.86 1,579 18.56 0.0091
2025-05-14 2025-03-31 13F COSTAR GROUP COM 22160N109 16,805 -2,013 -10.70 1,331 -1.19 0.0083
2025-02-07 2024-12-31 13F COSTAR GROUP COM 22160N109 18,818 2,054 12.25 1,347 6.57 0.0078
2024-11-13 2024-09-30 13F COSTAR GROUP COM 22160N109 16,764 1,840 12.33 1,265 14.29 0.0073
2024-08-05 2024-06-30 13F COSTAR GROUP COM 22160N109 14,924 -677 -4.34 1,106 -26.61 0.0067
2024-05-06 2024-03-31 13F COSTAR GROUP COM 22160N109 15,601 831 5.63 1,507 16.82 0.0096
2024-02-14 2023-12-31 13F COSTAR GROUP COM 22160N109 14,770 -1,019 -6.45 1,291 6.26 0.0089
2023-11-13 2023-09-30 13F COSTAR GROUP COM 22160N109 15,789 -5,191 -24.74 1,214 -34.98 0.0086
2023-08-08 2023-06-30 13F COSTAR GROUP COM 22160N109 20,980 -526 -2.45 1,867 37.08 0.0135
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 21,506 2,687 14.28 1,363 -6.33 0.0095
2023-02-13 2022-12-31 13F COSTAR GROUP COM 22160N109 18,819 0 0.00 1,454 10.91 0.0098
2022-11-10 2022-09-30 13F COSTAR GROUP COM 22160N109 18,819 -2,204 -10.48 1,311 3.23 0.0092
2022-08-03 2022-06-30 13F COSTAR GROUP COM 22160N109 21,023 0 0.00 1,270 -9.29 0.0105
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 21,023 1,400 7.13 1,400 -9.74 0.0095
2022-02-10 2021-12-31 13F COSTAR GROUP COM 22160N109 19,623 -1,207 -5.79 1,551 -13.50 0.0099
2021-11-09 2021-09-30 13F COSTAR GROUP COM 22160N109 20,830 -1,880 -8.28 1,793 -4.68 0.0122
2021-07-20 2021-06-30 13F COSTAR GROUP COM 22160N109 22,710 20,791 1,083.43 1,881 10.39 0.0129
2021-04-29 2021-03-31 13F COSTAR GROUP COM 22160N109 1,919 0 0.00 1,704 -3.95 0.0142
2021-01-22 2020-12-31 13F COSTAR GROUP COM 22160N109 1,919 145 8.17 1,774 17.87 0.0140
2020-10-19 2020-09-30 13F COSTAR GROUP COM 22160N109 1,774 0 0.00 1,505 19.35 0.0141
2020-07-23 2020-06-30 13F COSTAR GROUP COM 22160N109 1,774 -761 -30.02 1,261 -14.97 0.0133
2020-05-26 2020-03-31 13F COSTAR GROUP COM 22160N109 2,535 0 0.00 1,483 -2.24 0.0164
2020-02-05 2019-12-31 13F/A-1 COSTAR GROUP COM 22160N109 2,535 286 12.72 1,517 13.72 0.0163
2020-01-21 2019-12-31 13F COSTAR GROUP COM 22160N109 2,535 286 2 21,450.0215
2020-02-05 2019-09-30 13F/A-1 COSTAR GROUP COM 22160N109 2,249 1,334 -24.68 0.0177
2019-10-21 2019-09-30 13F COSTAR GROUP COM 22160N109 2,249 1 12,567.5506
2019-08-01 2019-06-30 13F COSTAR GROUP COM 22160N109 1,771 56.04 0.0221
2019-05-02 2019-03-31 13F COSTAR GROUP COM 22160N109 2,434 -243 -9.08 1,135 25.69 0.0145
2019-02-14 2018-12-31 13F COSTAR GROUP COM 22160N109 2,677 -310 -10.38 903 -28.16 0.0139
2018-11-07 2018-09-30 13F COSTAR GROUP COM 22160N109 2,987 2,987 1,257 0.0167
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.