CoStar Group, Inc.
US ˙ NasdaqGS ˙ US22160N1090

SecurityCSGP / CoStar Group, Inc.
InstitutionFirst Manhattan Co
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
First Manhattan Co closes position in CSGP / CoStar Group, Inc.

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 0 shares of CoStar Group, Inc. (US:CSGP) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 6,847 shares of CoStar Group, Inc.. The current value of the position is $0 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)
2026-05-15 2026-03-31 13F COSTAR GROUP COM 22160N109 0 -100.00 0
2026-02-17 2025-12-31 13F COSTAR GROUP COM 22160N109 6,847 0 0.00 460 -20.28 0.0012
2025-11-14 2025-09-30 13F COSTAR GROUP COM 22160N109 6,847 0 0.00 578 4.91 0.0015
2025-08-14 2025-06-30 13F COSTAR GROUP COM 22160N109 6,847 0 0.00 550 1.48 0.0016
2025-05-15 2025-03-31 13F COSTAR GROUP COM 22160N109 6,847 1,847 36.94 542 51.82 0.0016
2025-02-14 2024-12-31 13F COSTAR GROUP COM 22160N109 5,000 0 0.00 358 -5.31 0.0010
2024-11-14 2024-09-30 13F COSTAR GROUP COM 22160N109 5,000 -4 -0.08 377 1.89 0.0011
2024-08-15 2024-06-30 13F/A-1 COSTAR GROUP COM 22160N109 5,004 4 0.08 371 -23.40 0.0012
2024-08-14 2024-06-30 13F COSTAR GROUP COM 22160N109 5,004 4 371 0.0012
2024-05-15 2024-03-31 13F COSTAR GROUP COM 22160N109 5,000 0 0.00 483 10.78 0.0016
2024-02-13 2023-12-31 13F COSTAR GROUP COM 22160N109 5,000 -248 -4.73 437 8.19 0.0015
2023-11-14 2023-09-30 13F COSTAR GROUP COM 22160N109 5,248 4 0.08 404 -13.52 0.0015
2023-08-14 2023-06-30 13F COSTAR GROUP COM 22160N109 5,244 244 4.88 467 35.47 0.0017
2023-05-15 2023-03-31 13F COSTAR GROUP COM 22160N109 5,000 -90 -1.77 344 -12.47 0.0013
2023-02-14 2022-12-31 13F COSTAR GROUP COM 22160N109 5,090 90 1.80 393 12.93 0.0014
2022-11-14 2022-09-30 13F COSTAR GROUP COM 22160N109 5,000 -2,500 -33.33 348 -23.18 0.0015
2022-08-15 2022-06-30 13F COSTAR GROUP COM 22160N109 7,500 0 0.00 453 -9.22 0.0018
2022-05-16 2022-03-31 13F COSTAR GROUP COM 22160N109 7,500 -200 -2.60 499 -17.93 0.0016
2022-02-14 2021-12-31 13F COSTAR GROUP COM 22160N109 7,700 200 2.67 608 -5.74 0.0020
2021-11-15 2021-09-30 13F COSTAR GROUP COM 22160N109 7,500 0 0.00 645 3.86 0.0024
2021-08-16 2021-06-30 13F COSTAR GROUP COM 22160N109 7,500 6,750 900.00 621 0.81 0.0023
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 750 0 0.00 616 -11.11 0.0027
2021-02-16 2020-12-31 13F COSTAR GROUP COM 22160N109 750 0 0.00 693 8.96 0.0033
2020-11-12 2020-09-30 13F COSTAR GROUP COMMON 22160N109 750 0 0.00 636 19.32 0.0033
2020-08-14 2020-06-30 13F COSTAR GROUP COMMON 22160N109 750 -5 -0.66 533 20.32 0.0031
2020-05-06 2020-03-31 13F COSTAR GROUP COMMON 22160N109 755 -250 -24.88 443 -26.29 0.0029
2020-02-13 2019-12-31 13F COSTAR GROUP COMMON 22160N109 1,005 0 0.00 601 0.84 0.0030
2019-11-13 2019-09-30 13F COSTAR GROUP COMMON 22160N109 1,005 -595 -37.19 596 -32.73 0.0033
2019-08-16 2019-06-30 13F COSTAR GROUP COMMON 22160N109 1,600 0 0.00 886 18.77 0.0049
2019-04-12 2019-03-31 13F COSTAR GROUP COMMON 22160N109 1,600 0 0.00 746 38.40 0.0043
2019-01-30 2018-12-31 13F COSTAR GROUP COMMON 22160N109 1,600 600 60.00 539 28.33 0.0034
2018-10-15 2018-09-30 13F COSTAR GROUP COMMON 22160N109 1,000 -50 -4.76 420 -3.00 0.0022
2018-08-01 2018-06-30 13F COSTAR GROUP COMMON 22160N109 1,050 0 0.00 433 13.95 0.0025
2018-04-20 2018-03-31 13F COSTAR GROUP COMMON 22160N109 1,050 0 0.00 380 22.19 0.0022
2018-01-22 2017-12-31 13F COSTAR GROUP COMMON 22160N109 1,050 350 50.00 311 66.31 0.0017
2017-10-25 2017-09-30 13F COSTAR GROUP COMMON 22160N109 700 700 187 0.0011
2016-10-20 2016-09-30 13F COSTAR GROUP COMMON 22160N109 0 -46 -100.00 0 -100.00
2016-07-14 2016-06-30 13F COSTAR GROUP COMMON 22160N109 46 46 9 0.0001
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.