CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionKorea Investment CORP
Latest Disclosed Ownership183,877 shares
Latest Disclosed Value $ 7,417,598
Korea Investment CORP reports 10.36% decrease in ownership of CSGP / CoStar Group, Inc.

On May 13, 2026 - Korea Investment CORP filed a 13F-HR form disclosing ownership of 183,877 shares of CoStar Group, Inc. (MX:CSGP) valued at $7,417,598 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 205,123 shares of CoStar Group, Inc.. This represents a change in shares of -10.36% 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)
2026-05-13 2026-03-31 13F COSTAR GROUP COM 22160N109 183,877 -21,246 -10.36 7,418 -46.22 0.0154
2026-02-13 2025-12-31 13F COSTAR GROUP COM 22160N109 205,123 -39,877 -16.28 13,792 -33.28 0.0272
2025-11-13 2025-09-30 13F COSTAR GROUP COM 22160N109 245,000 61,650 33.62 20,671 40.22 0.0425
2025-08-13 2025-06-30 13F COSTAR GROUP COM 22160N109 183,350 -72,269 -28.27 14,741 -27.21 0.0328
2025-05-14 2025-03-31 13F COSTAR GROUP COM 22160N109 255,619 -24,191 -8.65 20,253 1.10 0.0491
2025-02-12 2024-12-31 13F COSTAR GROUP COM 22160N109 279,810 58,106 26.21 20,032 19.77 0.0475
2024-11-13 2024-09-30 13F COSTAR GROUP COM 22160N109 221,704 56,553 34.24 16,725 36.60 0.0397
2024-08-13 2024-06-30 13F COSTAR GROUP COM 22160N109 165,151 -55,185 -25.05 12,244 -42.47 0.0308
2024-05-14 2024-03-31 13F COSTAR GROUP COM 22160N109 220,336 43,860 24.85 21,284 38.01 0.0540
2024-02-13 2023-12-31 13F COSTAR GROUP COM 22160N109 176,476 -288,111 -62.01 15,422 -56.83 0.0405
2023-11-13 2023-09-30 13F COSTAR GROUP COM 22160N109 464,587 143,768 44.81 35,722 25.11 0.1052
2023-08-11 2023-06-30 13F COSTAR GROUP COM 22160N109 320,819 -283,991 -46.96 28,553 -31.43 0.0802
2023-05-12 2023-03-31 13F COSTAR GROUP COM 22160N109 604,810 266,310 78.67 41,641 59.18 0.1212
2023-02-13 2022-12-31 13F COSTAR GROUP COM 22160N109 338,500 -46,073 -11.98 26,159 -2.34 0.0822
2022-11-10 2022-09-30 13F COSTAR GROUP COM 22160N109 384,573 136,682 55.14 26,786 78.87 0.0825
2022-08-12 2022-06-30 13F COSTAR GROUP COM 22160N109 247,891 -84,309 -25.38 14,975 -32.33 0.0458
2022-05-13 2022-03-31 13F COSTAR GROUP COM 22160N109 332,200 -884,223 -72.69 22,128 -76.98 0.0547
2022-02-09 2021-12-31 13F COSTAR GROUP COM 22160N109 1,216,423 75,079 6.58 96,134 -2.13 0.2499
2021-11-12 2021-09-30 13F COSTAR GROUP COM 22160N109 1,141,344 -35,626 -3.03 98,224 0.77 0.2929
2021-08-12 2021-06-30 13F COSTAR GROUP COM 22160N109 1,176,970 1,050,941 833.89 97,477 -5.89 0.2792
2021-05-13 2021-03-31 13F COSTAR GROUP COM 22160N109 126,029 -6,015 -4.56 103,582 -15.13 0.3270
2021-02-10 2020-12-31 13F COSTAR GROUP COM 22160N109 132,044 34,638 35.56 122,046 47.67 0.3667
2020-11-12 2020-09-30 13F COSTAR GROUP COM 22160N109 97,406 8,300 9.31 82,650 30.52 0.2920
2020-08-12 2020-06-30 13F COSTAR GROUP COM 22160N109 89,106 7,500 9.19 63,325 32.15 0.2326
2020-05-14 2020-03-31 13F COSTAR GROUP COM 22160N109 81,606 76,006 1,357.25 47,920 1,330.45 0.2103
2020-02-11 2019-12-31 13F COSTAR GROUP COM 22160N109 5,600 -13,300 -70.37 3,350 -70.12 0.0122
2019-11-12 2019-09-30 13F COSTAR GROUP COM 22160N109 18,900 11,600 158.90 11,211 177.16 0.0474
2019-08-12 2019-06-30 13F COSTAR GROUP COM 22160N109 7,300 500 7.35 4,045 27.52 0.0174
2019-05-15 2019-03-31 13F COSTAR GROUP COM 22160N109 6,800 6,378 1,511.37 3,172 2,133.80 0.0143
2019-02-13 2018-12-31 13F COSTAR GROUP COM 22160N109 422 -200 -32.15 142 -45.80 0.0008
2018-11-13 2018-09-30 13F COSTAR GROUP COM 22160N109 622 622 262 0.0012
2018-08-13 2018-06-30 13F COSTAR GROUP COM 22160N109 0 -300 -100.00 0 -100.00
2018-05-09 2018-03-31 13F COSTAR GROUP COM 22160N109 300 300 109 0.0005
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.