CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DIESES SYMBOL IST NICHT MEHR AKTIV
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionFayez Sarofim & Co
Latest Disclosed Ownership374,575 shares
Latest Disclosed Value $ 15,110,356
Fayez Sarofim & Co reports 83.29% decrease in ownership of CSGP / CoStar Group, Inc.

On May 15, 2026 - Fayez Sarofim & Co filed a 13F-HR form disclosing ownership of 374,575 shares of CoStar Group, Inc. (MX:CSGP) valued at $15,110,356 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,241,437 shares of CoStar Group, Inc.. This represents a change in shares of -83.29% 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)
2026-05-15 2026-03-31 13F COSTAR GROUP Common Stock 22160N109 374,575 -1,866,862 -83.29 15,110 -89.97 0.0122
2026-02-13 2025-12-31 13F COSTAR GROUP Common Stock 22160N109 2,241,437 66,638 3.06 150,714 -17.86 0.3617
2025-11-14 2025-09-30 13F COSTAR GROUP INC COM COM 22160N109 2,174,799 17,666 0.82 183,488 5.80 0.4255
2025-08-14 2025-06-30 13F COSTAR GROUP COM 22160N109 2,157,133 11,766 0.55 173,433 2.03 0.4162
2025-05-12 2025-03-31 13F COSTAR GROUP COM 22160N109 2,145,367 102,277 5.01 169,978 16.21 0.4227
2025-02-14 2024-12-31 13F COSTAR GROUP COM 22160N109 2,043,090 94,715 4.86 146,265 -0.49 0.3555
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 1,948,375 540,574 38.40 146,985 40.83 0.3736
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 1,407,801 1,407,801 104,374 0.2816
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.