CoStar Group, Inc.
US ˙ NasdaqGS ˙ US22160N1090

SecurityCSGP / CoStar Group, Inc.
InstitutionWhittier Trust Co
Latest Disclosed Ownership1,750 shares
Latest Disclosed Value $ 72,056
Whittier Trust Co ownership in CSGP / CoStar Group, Inc.

On April 28, 2026 - Whittier Trust Co filed a 13F-HR form disclosing ownership of 1,750 shares of CoStar Group, Inc. (US:CSGP) valued at $70,595 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 1,750 shares of CoStar Group, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $58,450 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.

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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)
2026-04-28 2026-03-31 13F COSTAR GROUP common 22160N109 1,750 0 0.00 72 -38.46 0.0004
2026-01-26 2025-12-31 13F COSTAR GROUP common 22160N109 1,750 0 0.00 118 -20.95 0.0013
2025-10-31 2025-09-30 13F COSTAR GROUP common 22160N109 1,750 -250 -12.50 148 -7.50 0.0017
2025-07-30 2025-06-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 0 0.00 161 1.27 0.0019
2025-05-02 2025-03-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 0 0.00 158 10.49 0.0022
2025-02-11 2024-12-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 0 0.00 143 -4.67 0.0019
2024-10-21 2024-09-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 0 0.00 151 1.35 0.0020
2024-07-29 2024-06-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 0 0.00 148 -23.32 0.0021
2024-05-02 2024-03-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 0 0.00 193 10.92 0.0028
2024-01-11 2023-12-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 -10 -0.50 175 12.99 0.0028
2023-10-27 2023-09-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,010 10 0.50 155 -13.48 0.0027
2023-07-24 2023-06-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 0 0.00 178 29.93 0.0031
2023-04-21 2023-03-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 0 0.00 138 -11.04 0.0025
2023-01-25 2022-12-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,000 -120 -5.66 155 4.05 0.0030
2022-10-21 2022-09-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,120 -14 -0.66 148 14.73 0.0031
2022-07-28 2022-06-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,134 0 0.00 129 -9.15 0.0026
2022-04-29 2022-03-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,134 120 5.96 142 -10.69 0.0024
2022-01-19 2021-12-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,014 0 0.00 159 -8.09 0.0026
2021-11-01 2021-09-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,014 -266 -11.67 173 -8.47 0.0032
2021-07-29 2021-06-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 2,280 2,080 1,040.00 189 15.24 0.0034
2021-04-26 2021-03-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 200 0 0.00 164 -11.35 0.0032
2021-01-29 2020-12-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 200 0 0.00 185 8.82 0.0040
2020-10-30 2020-09-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 200 0 0.00 170 19.72 0.0040
2020-07-10 2020-06-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 200 0 0.00 142 21.37 0.0039
2020-04-27 2020-03-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 200 0 0.00 117 -2.50 0.0038
2020-01-31 2019-12-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 200 0 0.00 120 0.84 0.0031
2019-10-18 2019-09-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 200 200 119 0.0034
2019-07-23 2019-06-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 0 -100 -100.00 0 -100.00
2019-04-29 2019-03-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 100 -20 -16.67 47 17.50 0.0014
2019-02-07 2018-12-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 120 20 20.00 40 -4.76 0.0014
2018-10-23 2018-09-30 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 100 0 0.00 42 2.44 0.0013
2018-07-27 2018-06-30 13F/A-1 COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 100 0 0.00 41 13.89 0.0014
2018-05-01 2018-03-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 100 0 0.00 36 20.00 0.0012
2018-02-07 2017-12-31 13F COSTAR GROUP INC COM US MID-CAP EQUITIES 22160N109 100 100 30 0.0010
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.