CoStar Group, Inc.
IT ˙ BIT ˙ US22160N1090
27,96 € 0,00 (0,00%)
2026-06-03
AKTIENPREIS
SecurityIT:1CSGP / CoStar Group, Inc.
InstitutionAssetmark, Inc
Latest Disclosed Ownership13,360 shares
Latest Disclosed Value $ 538,942
Assetmark, Inc reports 520.53% increase in ownership of 1CSGP / CoStar Group, Inc.

On May 6, 2026 - Assetmark, Inc filed a 13F-HR form disclosing ownership of 13,360 shares of CoStar Group, Inc. (IT:1CSGP) valued at $512,289 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 2,153 shares of CoStar Group, Inc.. This represents a change in shares of 520.53% during the quarter. The current value of the position is $373,546 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-06 2026-03-31 13F COSTAR GROUP COM 22160N109 13,360 11,207 520.53 539 273.61 0.0011
2026-01-23 2025-12-31 13F COSTAR GROUP COM 22160N109 2,153 -1,001 -31.74 145 -45.86 0.0003
2025-11-06 2025-09-30 13F COSTAR GROUP COM 22160N109 3,154 489 18.35 266 24.30 0.0006
2025-08-04 2025-06-30 13F COSTAR GROUP COM 22160N109 2,665 1,358 103.90 214 107.77 0.0005
2025-05-06 2025-03-31 13F COSTAR GROUP COM 22160N109 1,307 -1,969 -60.10 104 -55.98 0.0003
2025-02-06 2024-12-31 13F COSTAR GROUP COM 22160N109 3,276 -65,383 -95.23 235 -95.48 0.0006
2024-11-01 2024-09-30 13F COSTAR GROUP COM 22160N109 68,659 13,320 24.07 5,180 26.26 0.0148
2024-08-13 2024-06-30 13F COSTAR GROUP COM 22160N109 55,339 -9,765 -15.00 4,103 -34.78 0.0127
2024-05-07 2024-03-31 13F COSTAR GROUP COM 22160N109 65,104 -3,426 -5.00 6,289 5.03 0.0204
2024-02-09 2023-12-31 13F COSTAR GROUP COM 22160N109 68,530 12,528 22.37 5,989 39.09 0.0216
2023-10-27 2023-09-30 13F COSTAR GROUP COM 22160N109 56,002 -22,214 -28.40 4,306 -38.16 0.0172
2023-08-11 2023-06-30 13F COSTAR GROUP INC COM COM 22160N109 78,216 11,766 17.71 6,961 52.15 0.0273
2023-05-05 2023-03-31 13F COSTAR GROUP INC COM COM 22160N109 66,450 -10,759 -13.93 4,575 -23.32 0.0189
2023-02-10 2022-12-31 13F COSTAR GROUP COM 22160N109 77,209 14,619 23.36 5,967 36.87 0.0259
2022-11-01 2022-09-30 13F COSTAR GROUP COM 22160N109 62,590 25,403 68.31 4,359 94.08 0.0204
2022-08-03 2022-06-30 13F COSTAR GROUP INC COM COM 22160N109 37,187 21,853 142.51 2,246 119.98 0.0101
2022-05-13 2022-03-31 13F COSTAR GROUP INC COM COM 22160N109 15,334 11,052 258.10 1,021 202.07 0.0043
2022-02-14 2021-12-31 13F COSTAR GROUP INC COM COM 22160N109 4,282 3,979 1,313.20 338 1,200.00 0.0014
2021-11-12 2021-09-30 13F COSTAR GROUP INC COM COM 22160N109 303 273 910.00 26 1,200.00 0.0001
2021-08-16 2021-06-30 13F COSTAR GROUP INC COM COM 22160N109 30 28 1,400.00 2 0.00 0.0000
2021-05-14 2021-03-31 13F COSTAR GROUP COM 22160N109 2 2 2 0.0000
2020-11-13 2020-09-30 13F COSTAR GROUP INC COM COM 22160N109 0 -2,431 -100.00 0 -100.00
2020-08-11 2020-06-30 13F COSTAR GROUP INC COM COM 22160N109 2,431 2,335 2,432.29 1,728 2,985.71 0.0124
2020-05-12 2020-03-31 13F COSTAR GROUP INC COM COM 22160N109 96 -13 -11.93 56 -13.85 0.0005
2020-02-11 2019-12-31 13F COSTAR GROUP INC COM COM 22160N109 109 11 11.22 65 12.07 0.0005
2019-11-13 2019-09-30 13F COSTAR GROUP INC COM COM 22160N109 98 98 58 0.0005
2018-11-13 2018-09-30 13F COSTAR GROUP INC COM COM 22160N109 0 -37 -100.00 0 -100.00
2018-08-01 2018-06-30 13F COSTAR GROUP INC COM COM 22160N109 37 3 8.82 15 25.00 0.0001
2018-05-16 2018-03-31 13F COSTAR GROUP INC COM COM 22160N109 34 20 142.86 12 200.00 0.0001
2018-02-13 2017-12-31 13F COSTAR GROUP INC COM COM 22160N109 14 -8 -36.36 4 -33.33 0.0000
2017-11-08 2017-09-30 13F COSTAR GROUP INC COM COM 22160N109 22 0 0.00 6 0.00 0.0001
2017-08-14 2017-06-30 13F COSTAR GROUP INC COM COM 22160N109 22 0 0.00 6 20.00 0.0001
2017-09-15 2017-03-31 13F/A-1 COSTAR GROUP INC COM COM 22160N109 22 0 0.00 5 25.00 0.0001
2017-05-08 2017-03-31 13F COSTAR GROUP INC COM COM 22160N109 22 0 5
2017-09-15 2016-12-31 13F/A-1 COSTAR GROUP INC COM COM 22160N109 22 -7 -24.14 4 -33.33 0.0001
2017-02-14 2016-12-31 13F COSTAR GROUP INC COM COM 22160N109 22 -7 4
2017-09-14 2016-09-30 13F/A-1 COSTAR GROUP INC COM COM 22160N109 29 2 7.41 6 0.00 0.0001
2016-11-04 2016-09-30 13F COSTAR GROUP INC COM COM 22160N109 29 2 6
2017-09-14 2016-06-30 13F/A-1 COSTAR GROUP INC COM COM 22160N109 27 0 0.00 6 20.00 0.0001
2016-08-08 2016-06-30 13F COSTAR GROUP INC COM COM 22160N109 27 0 6
2017-09-14 2016-03-31 13F/A-1 COSTAR GROUP INC COM COM 22160N109 27 7 35.00 5 25.00 0.0001
2016-05-13 2016-03-31 13F COSTAR GROUP INC COM COM 22160N109 27 7 5
2017-09-14 2015-12-31 13F/A-1 COSTAR GROUP INC COM COM 22160N109 20 20 4 0.0001
2016-02-12 2015-12-31 13F COSTAR GROUP INC COM COM 22160N109 20 20 4
2015-11-10 2015-09-30 13F COSTAR GROUP INC COM COM 22160N109 0 0 0 0.0000
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.