CoStar Group, Inc.
US ˙ NasdaqGS ˙ US22160N1090

SecurityCSGP / CoStar Group, Inc.
InstitutionRockefeller Capital Management L.P.
Latest Disclosed Ownership6,071 shares
Latest Disclosed Value $ 244,904
Rockefeller Capital Management L.P. reports 4.15% increase in ownership of CSGP / CoStar Group, Inc.

On May 14, 2026 - Rockefeller Capital Management L.P. filed a 13F-HR form disclosing ownership of 6,071 shares of CoStar Group, Inc. (US:CSGP) valued at $244,904 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on March 16, 2026 disclosing 5,829 shares of CoStar Group, Inc.. This represents a change in shares of 4.15% during the quarter. The current value of the position is $204,350 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)
2026-05-14 2026-03-31 13F COSTAR GROUP COM 22160N109 6,071 242 4.15 245 -37.60 0.0004
2026-03-16 2025-12-31 13F/A-1 COSTAR GROUP COM 22160N109 5,829 -1,103 -15.91 392 -33.05 0.0007
2026-02-14 2025-12-31 13F COSTAR GROUP COM 22160N109 5,829 -1,103 392 0.0004
2025-11-14 2025-09-30 13F COSTAR GROUP COM 22160N109 6,932 -4,903 -41.43 585 -38.59 0.0011
2025-08-14 2025-06-30 13F/A-1 COSTAR GROUP COM 22160N109 11,835 1,126 10.51 952 12.15 0.0021
2025-08-08 2025-06-30 13F COSTAR GROUP COM 22160N109 11,835 1,126 952 0.0012
2025-05-14 2025-03-31 13F COSTAR GROUP COM 22160N109 10,709 -1,638 -13.27 848 -4.07 0.0021
2025-02-13 2024-12-31 13F COSTAR GROUP COM 22160N109 12,347 12,347 885 0.0023
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 0 -10,413 -100.00 0 -100.00
2024-08-12 2024-06-30 13F COSTAR GROUP COM 22160N109 10,413 282 2.78 773 -21.06 0.0022
2024-05-14 2024-03-31 13F COSTAR GROUP COM 22160N109 10,131 -1,440 -12.44 979 -3.26 0.0029
2024-02-14 2023-12-31 13F COSTAR GROUP COM 22160N109 11,571 11,571 1,011 0.0034
2023-11-14 2023-09-30 13F COSTAR GROUP COM 22160N109 0 -13,697 -100.00 0 -100.00
2023-08-14 2023-06-30 13F COSTAR GROUP COM 22160N109 13,697 4,892 55.56 1,219 0.0047
2023-05-16 2023-03-31 13F COSTAR GROUP COM 22160N109 8,805 4,264 93.90 1 -100.00 0.0026
2023-03-06 2022-12-31 13F COSTAR GROUP COM 22160N109 4,541 1,078 31.13 350 45.23 0.0018
2022-11-02 2022-09-30 13F COSTAR GROUP COM 22160N109 3,463 -172 -4.73 241 10.05 0.0012
2022-08-12 2022-06-30 13F COSTAR GROUP COM 22160N109 3,635 210 6.13 219 -3.52 0.0012
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 3,425 -2,736 -44.41 227 -53.29 0.0011
2022-02-14 2021-12-31 13F COSTAR GROUP COM 22160N109 6,161 -183 -2.88 486 -10.66 0.0023
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 6,344 1,844 40.98 544 46.24 0.0029
2021-08-10 2021-06-30 13F COSTAR GROUP COM 22160N109 4,500 4,266 1,823.08 372 94.76 0.0021
2021-05-11 2021-03-31 13F COSTAR GROUP COM 22160N109 234 86 58.11 191 40.44 0.0013
2021-02-12 2020-12-31 13F COSTAR GROUP COM 22160N109 148 25 20.33 136 30.77 0.0010
2020-11-13 2020-09-30 13F COSTAR GROUP COM 22160N109 123 -146 -54.28 104 -45.55 0.0010
2020-08-12 2020-06-30 13F COSTAR GROUP COM 22160N109 269 195 263.51 191 344.19 0.0020
2020-05-12 2020-03-31 13F COSTAR GROUP COM 22160N109 74 37 100.00 43 95.45 0.0006
2020-02-07 2019-12-31 13F COSTAR GROUP COM 22160N109 37 19 105.56 22 100.00 0.0003
2019-11-12 2019-09-30 13F COSTAR GROUP COM 22160N109 18 -5 -21.74 11 -15.38 0.0001
2019-08-09 2019-06-30 13F COSTAR GROUP COM 22160N109 23 -58 -71.60 13 -65.79 0.0002
2019-05-10 2019-03-31 13F COSTAR GROUP COM 22160N109 81 81 38 0.0005
2019-02-12 2018-12-31 13F CoStar Group Common 22160N109 0 -63 -100.00 0 -100.00
2018-11-02 2018-09-30 13F CoStar Group Common 22160N109 63 0 0.00 27 3.85 0.0004
2018-07-31 2018-06-30 13F CoStart Group Common 22160N109 63 0 0.00 26 13.04 0.0004
2018-05-09 2018-03-31 13F CoStart Group Common 22160N109 63 63 23 0.0004
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.