CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionGoldman Sachs Group Inc
Latest Disclosed Ownership9,245,812 shares
Latest Disclosed Value $ 372,976,077
Goldman Sachs Group Inc ownership in CSGP / CoStar Group, Inc.

On May 15, 2026 - Goldman Sachs Group Inc filed a 13F-HR form disclosing ownership of 9,245,812 shares of CoStar Group, Inc. (MX:CSGP) valued at $372,976,077 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 3,751,312 shares of CoStar Group, Inc.. This represents a change in shares of 146.47% during the quarter.

Goldman Sachs Group Inc has a history of taking positions in derivatives of the underlying security (CSGP) in the form of stock options. The firm currently holds call options representing 8,900 of underlying shares valued at $359,026 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:CSGP / CoStar Group, Inc. Historical Put/Call Ratio
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 CMN 22160N109 9,245,812 5,494,500 146.47 372,976 47.87 0.0100
2026-02-10 2025-12-31 13F COSTAR GROUP CMN 22160N109 3,751,312 1,556,100 70.89 252,238 36.19 0.0311
2025-11-14 2025-09-30 13F COSTAR GROUP CMN 22160N109 2,195,212 12,031 0.55 185,210 5.52 0.0227
2025-08-14 2025-06-30 13F COSTAR GROUP CMN 22160N109 2,183,181 -517,215 -19.15 175,528 -17.96 0.0238
2025-06-27 2025-03-31 13F/A-2 COSTAR GROUP CMN 22160N109 2,700,396 -729,594 -21.27 213,952 -12.87 0.0346
2025-05-16 2025-03-31 13F/A-1 COSTAR GROUP CMN 22160N109 2,700,396 -729,594 213,952 0.0089
2025-05-09 2025-03-31 13F COSTAR GROUP CMN 22160N109 3,745,696 315,706 296,772 0.0089
2025-02-11 2024-12-31 13F COSTAR GROUP CMN 22160N109 3,429,990 838,501 32.36 245,553 25.60 0.0387
2024-11-14 2024-09-30 13F COSTAR GROUP CMN 22160N109 2,591,489 149,523 6.12 195,502 7.98 0.0315
2024-08-13 2024-06-30 13F COSTAR GROUP CMN 22160N109 2,441,966 -648,322 -20.98 181,047 -39.35 0.0306
2024-05-15 2024-03-31 13F COSTAR GROUP CMN 22160N109 3,090,288 88,470 2.95 298,522 13.80 0.0529
2024-05-14 2023-12-31 13F/A-2 COSTAR GROUP CMN 22160N109 3,001,818 630,141 26.57 262,329 43.85 0.0483
2024-03-01 2023-12-31 13F/A-1 COSTAR GROUP CMN 22160N109 3,001,818 630,141 262,329 0.0471
2024-02-13 2023-12-31 13F COSTAR GROUP CMN 22160N109 3,001,818 630,141 262,329 0.0124
2024-05-15 2023-09-30 13F/A-1 COSTAR GROUP CMN 22160N109 2,371,677 655,299 38.18 182,358 19.38 0.0388
2023-11-14 2023-09-30 13F COSTAR GROUP CMN 22160N109 2,371,677 655,299 182,358 0.0366
2024-05-14 2023-06-30 13F/A-1 COSTAR GROUP CMN 22160N109 1,716,378 336,881 24.42 152,758 60.83 0.0328
2023-08-15 2023-06-30 13F COSTAR GROUP CMN 22160N109 1,716,378 336,881 152,758 0.0308
2024-05-14 2023-03-31 13F/A-1 COSTAR GROUP CMN 22160N109 1,379,497 -143,982 -9.45 94,978 -19.33 0.0218
2023-05-11 2023-03-31 13F COSTAR GROUP CMN 22160N109 1,379,497 -143,982 94,978 0.0203
2024-05-14 2022-12-31 13F/A-1 COSTAR GROUP CMN 22160N109 1,523,479 123,103 8.79 117,734 121,275.26 0.0289
2023-02-13 2022-12-31 13F COSTAR GROUP CMN 22160N109 1,523,479 123,103 117,734 0.0264
2024-05-14 2022-09-30 13F/A-1 COSTAR GROUP CMN 22160N109 1,400,376 248,009 21.52 98 40.58 0.0246
2022-11-14 2022-09-30 13F COSTAR GROUP CMN 22160N109 1,400,376 248,009 97,536 0.0225
2024-05-14 2022-06-30 13F/A-2 COSTAR GROUP CMN 22160N109 1,152,367 -202,441 -14.94 70 -99.92 0.0174
2022-08-18 2022-06-30 13F/A-1 COSTAR GROUP CMN 22160N109 1,152,367 -202,441 69,614 0.0157
2022-08-15 2022-06-30 13F COSTAR GROUP CMN 22160N109 1,152,367 -202,441 69,614 0.0157
2022-05-16 2022-03-31 13F COSTAR GROUP CMN 22160N109 1,354,808 -41,351 -2.96 90,244 -18.21 0.0190
2022-02-17 2021-12-31 13F/A-1 COSTAR GROUP CMN 22160N109 1,396,159 -332,426 -19.23 110,338 -25.83 0.0219
2022-02-14 2021-12-31 13F COSTAR GROUP CMN 22160N109 1,396,159 -332,426 110,338 0.0063
2022-01-20 2021-09-30 13F/A-1 COSTAR GROUP CMN 22160N109 1,728,585 140,331 8.84 148,762 13.09 0.0316
2021-11-10 2021-09-30 13F COSTAR GROUP CMN 22160N109 1,728,585 140,331 148,762 0.0314
2021-08-13 2021-06-30 13F COSTAR GROUP CMN 22160N109 1,588,254 1,473,905 1,288.95 131,540 39.96 0.0295
2021-05-17 2021-03-31 13F COSTAR GROUP CMN 22160N109 114,349 -28,117 -19.74 93,982 -28.63 0.0237
2021-02-12 2020-12-31 13F COSTAR GROUP CMN 22160N109 142,466 10,387 7.86 131,679 17.50 0.0339
2020-11-13 2020-09-30 13F COSTAR GROUP CMN 22160N109 132,079 -226,219 -63.14 112,070 -55.99 0.0318
2020-08-12 2020-06-30 13F COSTAR GROUP CMN 22160N109 358,298 -41,698 -10.42 254,632 8.41 0.0773
2020-05-15 2020-03-31 13F COSTAR GROUP CMN 22160N109 399,996 133,937 50.34 234,882 47.55 0.0828
2020-02-14 2019-12-31 13F COSTAR GROUP CMN 22160N109 266,059 -131,530 -33.08 159,183 -32.51 0.0405
2019-11-14 2019-09-30 13F COSTAR GROUP CMN 22160N109 397,589 174,961 78.59 235,851 91.21 0.0681
2019-08-14 2019-06-30 13F COSTAR GROUP CMN 22160N109 222,628 6,236 2.88 123,349 22.21 0.0355
2019-05-15 2019-03-31 13F COSTAR GROUP CMN 22160N109 216,392 123,699 133.45 100,930 222.78 0.0305
2019-02-14 2018-12-31 13F COSTAR GROUP CMN 22160N109 92,693 -38,287 -29.23 31,269 -43.27 0.0100
2018-11-14 2018-09-30 13F COSTAR GROUP CMN 22160N109 130,980 8,546 6.98 55,122 9.11 0.0142
2018-08-14 2018-06-30 13F COSTAR GROUP CMN 22160N109 122,434 -185,353 -60.22 50,519 -54.74 0.0137
2018-05-15 2018-03-31 13F COSTAR GROUP CMN 22160N109 307,787 -393 -0.13 111,629 21.98 0.0286
2018-02-14 2017-12-31 13F COSTAR GROUP CMN 22160N109 308,180 92,864 43.13 91,514 58.44 0.0219
2017-11-14 2017-09-30 13F COSTAR GROUP CMN 22160N109 215,316 83,945 63.90 57,759 66.79 0.0141
2017-08-14 2017-06-30 13F COSTAR GROUP CMN 22160N109 131,371 -59,218 -31.07 34,629 -12.32 0.0090
2017-05-18 2017-03-31 13F/A-1 COSTAR GROUP CMN 22160N109 190,589 -14,574 -7.10 39,494 2.13 0.0107
2017-05-15 2017-03-31 13F COSTAR GROUP CMN 22160N109 190,589 39,494
2017-02-14 2016-12-31 13F COSTAR GROUP CMN 22160N109 205,163 92,836 82.65 38,671 59.00 0.0109
2016-11-14 2016-09-30 13F COSTAR GROUP CMN 22160N109 112,327 -25,397 -18.44 24,322 -19.24 0.0074
2016-08-15 2016-06-30 13F COSTAR GROUP CMN 22160N109 137,724 -30,955 -18.35 30,115 -5.12 0.0098
2016-05-13 2016-03-31 13F COSTAR GROUP CMN 22160N109 168,679 18,069 12.00 31,740 1.96 0.0104
2016-02-16 2015-12-31 13F COSTAR GROUP CMN 22160N109 150,610 7,133 4.97 31,130 25.37 0.0098
2015-11-13 2015-09-30 13F COSTAR GROUP CMN 22160N109 143,477 70,705 97.16 24,830 69.53 0.0084
2015-08-14 2015-06-30 13F COSTAR GROUP CMN 22160N109 72,772 40,981 128.91 14,646 132.88 0.0045
2015-05-15 2015-03-31 13F COSTAR GROUP CMN 22160N109 31,791 8,834 38.48 6,289 49.17 0.0020
2015-02-13 2014-12-31 13F COSTAR GROUP CMN 22160N109 22,957 -21,802 -48.71 4,216 -39.44 0.0013
2014-11-14 2014-09-30 13F COSTAR GROUP CMN 22160N109 44,759 9,010 25.20 6,962 23.11 0.0022
2014-08-14 2014-06-30 13F COSTAR GROUP CMN 22160N109 35,749 -33,154 -48.12 5,655 -56.05 0.0018
2014-05-15 2014-03-31 13F COSTAR GROUP CMN 22160N109 68,903 -28,037 -28.92 12,867 -28.09 0.0042
2014-02-14 2013-12-31 13F COSTAR GROUP CMN 22160N109 96,940 17,221 21.60 17,893 33.67 0.0059
2013-11-14 2013-09-30 13F COSTAR GROUP CMN 22160N109 79,719 -11,558 -12.66 13,386 13.62 0.0049
2013-08-14 2013-06-30 13F COSTAR GROUP CMN 22160N109 91,277 -17,181 -15.84 11,781 21.54 0.0045
2013-06-14 2012-12-31 13F/A-1 COSTAR GROUP CMN 22160N109 108,458 -3,245 -2.91 9,693 6.41 0.0040
2013-06-14 2012-09-30 13F/A-2 COSTAR GROUP CMN 22160N109 111,703 -6,310 -5.35 9,109 -4.95 0.0036
2013-06-14 2012-06-30 13F/A-2 COSTAR GROUP CMN 22160N109 118,013 100,754 583.78 9,583 703.94 0.0043
2013-06-14 2012-03-31 13F/A-1 COSTAR GROUP CMN 22160N109 17,259 17,259 1,192 0.0006
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F COSTAR GROUP CMN Call 8,900 359 n/a n/a n/a
2025-11-14 2025-09-30 13F COSTAR GROUP CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-08-14 2025-06-30 13F COSTAR GROUP CMN Call 56,500 -94.59 4,543 -94.52 n/a n/a n/a
2025-05-16 2025-03-31 13F/A COSTAR GROUP CMN Call 1,045,300 82,819 n/a n/a n/a
2025-06-27 2025-03-31 13F/A COSTAR GROUP CMN Call 1,045,300 82,819 n/a n/a n/a
2024-05-15 2023-09-30 13F/A COSTAR GROUP CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-14 2023-09-30 13F COSTAR GROUP CMN Call 0 0 n/a n/a n/a
2024-05-14 2023-06-30 13F/A COSTAR GROUP CMN Call 212,200 18,886 n/a n/a n/a
2023-08-15 2023-06-30 13F COSTAR GROUP CMN Call 212,200 18,886 n/a n/a n/a
2021-02-12 2020-12-31 13F COSTAR GROUP CMN Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-11-13 2020-09-30 13F COSTAR GROUP CMN Call 5,000 -95.02 4,243 -94.05 n/a n/a n/a
2020-08-12 2020-06-30 13F COSTAR GROUP CMN Call 100,400 0.00 71,351 21.02 n/a n/a n/a
2020-05-15 2020-03-31 13F COSTAR GROUP CMN Call 100,400 1,221.05 58,956 1,196.59 n/a n/a n/a
2020-02-14 2019-12-31 13F COSTAR GROUP CMN Call 7,600 4,547 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2024-05-15 2023-09-30 13F/A COSTAR GROUP CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2023-11-14 2023-09-30 13F COSTAR GROUP CMN Put 0 0 n/a n/a n/a
2024-05-14 2023-06-30 13F/A COSTAR GROUP CMN Put 40,400 -19.20 3,596 4.45 n/a n/a n/a
2023-08-15 2023-06-30 13F COSTAR GROUP CMN Put 40,400 3,596 n/a n/a n/a
2024-05-14 2023-03-31 13F/A COSTAR GROUP CMN Put 50,000 3,442 n/a n/a n/a
2023-05-11 2023-03-31 13F COSTAR GROUP CMN Put 50,000 3,442 n/a n/a n/a
2020-11-13 2020-09-30 13F COSTAR GROUP CMN Put 0 -100.00 0 -100.00 n/a n/a n/a
2020-08-12 2020-06-30 13F COSTAR GROUP CMN Put 2,000 5.26 1,421 27.33 n/a n/a n/a
2020-05-15 2020-03-31 13F COSTAR GROUP CMN Put 1,900 1,116 n/a n/a n/a
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.