CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DIESES SYMBOL IST NICHT MEHR AKTIV
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionBnp Paribas Arbitrage, Sa
Latest Disclosed Ownership768,716 shares
Latest Disclosed Value $ 31,010,003
Bnp Paribas Arbitrage, Sa ownership in CSGP / CoStar Group, Inc.

On May 12, 2026 - Bnp Paribas Arbitrage, Sa filed a 13F-HR form disclosing ownership of 768,716 shares of CoStar Group, Inc. (MX:CSGP) valued at $31,010,003 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 997,813 shares of CoStar Group, Inc.. This represents a change in shares of -22.96% during the quarter.

Bnp Paribas Arbitrage, Sa 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 0 of underlying shares valued at $0 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)
2026-05-12 2026-03-31 13F CoStar Group Equity 22160N109 768,716 -229,097 -22.96 31,010 -53.78 0.0015
2026-02-10 2025-12-31 13F CoStar Group Equity 22160N109 997,813 325,944 48.51 67,093 18.36 0.0304
2025-11-13 2025-09-30 13F CoStar Group Equity 22160N109 671,869 -607,401 -47.48 56,686 -44.89 0.0303
2025-08-14 2025-06-30 13F CoStar Group Equity 22160N109 1,279,270 -381,613 -22.98 102,853 -21.84 0.0589
2025-05-14 2025-03-31 13F CoStar Group Equity 22160N109 1,660,883 761,431 84.65 131,592 104.36 0.0774
2025-02-14 2024-12-31 13F CoStar Group Equity 22160N109 899,452 -360,705 -28.62 64,392 -32.27 0.0361
2024-11-13 2024-09-30 13F CoStar Group Equity 22160N109 1,260,157 317,017 33.61 95,066 35.96 0.0639
2024-08-13 2024-06-30 13F CoStar Group Equity 22160N109 943,140 177,647 23.21 69,924 -5.44 0.0570
2024-05-01 2024-03-31 13F CoStar Group Equity 22160N109 765,493 348,120 83.41 73,947 102.74 0.0649
2024-02-14 2023-12-31 13F/A-2 CoStar Group Equity 22160N109 417,373 74,357 21.68 36,474 38.30 0.0414
2024-02-07 2023-12-31 13F/A-1 CoStar Group Equity 22160N109 417,373 74,357 36,474 0.0051
2024-02-07 2023-12-31 13F CoStar Group Equity 22160N109 417,373 36,474
2023-11-14 2023-09-30 13F CoStar Group Equity 22160N109 343,016 115,828 50.98 26,374 30.44 0.0339
2023-08-09 2023-06-30 13F CoStar Group Equity 22160N109 227,188 70,195 44.71 20,220 87.07 0.0253
2023-05-12 2023-03-31 13F COSTAR GROUP EQUITY 22160N109 156,993 -192,468 -55.08 10,809 -59.98 0.0151
2023-02-14 2022-12-31 13F CoStar Group Equity 22160N109 349,461 78,808 29.12 27,006 43.27 0.0415
2022-11-16 2022-09-30 13F/A-1 CoStar Group Equity 22160N109 270,653 143,135 112.25 18,851 144.71 0.0302
2022-11-15 2022-09-30 13F CoStar Group Equity 22160N109 270,653 143,135 18,851 0.0045
2022-08-12 2022-06-30 13F CoStar Group Equity 22160N109 127,518 3,837 3.10 7,703 -6.49 0.0120
2022-05-18 2022-03-31 13F/A-1 CoStar Group Equity 22160N109 123,681 -662 -0.53 8,238 -16.16 0.0111
2022-02-09 2021-12-31 13F COSTAR GROUP EQUITY 22160N109 124,343 54,246 77.39 9,827 62.90 0.0140
2021-11-16 2021-09-30 13F/A-1 COSTAR GROUP EQUITY 22160N109 70,097 -122,018 -63.51 6,033 -62.09 0.0086
2021-11-12 2021-09-30 13F COSTAR GROUP EQUITY 22160N109 12,008 -180,107 10,189 0.0000
2021-08-10 2021-06-30 13F COSTAR GROUP EQUITY 22160N109 192,115 183,696 2,181.92 15,911 129.95 0.0211
2021-05-07 2021-03-31 13F COSTAR GROUP EQUITY 22160N109 8,419 -20,980 -71.36 6,919 -74.54 0.0101
2021-02-10 2020-12-31 13F COSTAR GROUP EQUITY 22160N109 29,399 17,391 144.83 27,173 166.71 0.0505
2020-10-30 2020-09-30 13F COSTAR GROUP EQUITY 22160N109 12,008 -21,072 -63.70 10,189 -56.66 0.0146
2020-08-06 2020-06-30 13F COSTAR GROUP EQUITY 22160N109 33,080 766 2.37 23,509 23.89 0.0415
2020-05-13 2020-03-31 13F COSTAR GROUP EQUITY 22160N109 32,314 16,069 98.92 18,975 95.24 0.0389
2020-02-12 2019-12-31 13F COSTAR GROUP EQUITY 22160N109 16,245 -50,718 -75.74 9,719 -75.53 0.0177
2019-11-07 2019-09-30 13F COSTAR GROUP EQUITY 22160N109 66,963 58,313 674.14 39,722 728.92 0.0705
2019-07-30 2019-06-30 13F COSTAR GROUP EQUITY 22160N109 8,650 -7,563 -46.65 4,793 -36.63 0.0095
2019-04-25 2019-03-31 13F COSTAR GROUP EQUITY 22160N109 16,213 9,947 158.75 7,562 257.88 0.0163
2019-02-12 2018-12-31 13F COSTAR GROUP EQUITY 22160N109 6,266 -2,262 -26.52 2,114 -41.11 0.0050
2018-11-07 2018-09-30 13F COSTAR GROUP EQUITY 22160N109 8,528 396 4.87 3,589 6.94 0.0053
2018-07-25 2018-06-30 13F COSTAR GROUP EQUITY 22160N109 8,132 4,644 133.14 3,356 165.22 0.0056
2018-05-11 2018-03-31 13F COSTAR GROUP EQUITY 22160N109 3,488 641 22.51 1,265 49.70 0.0024
2018-03-05 2017-12-31 13F/A-1 COSTAR GROUP EQUITY 22160N109 2,847 737 34.93 845 49.29 0.0015
2018-02-01 2017-12-31 13F COSTAR GROUP EQUITY 22160N109 2,847 737 845
2017-11-03 2017-09-30 13F COSTAR GROUP STOCK 22160N109 2,110 -1,151 -35.30 566 -34.11 0.0014
2017-08-03 2017-06-30 13F COSTAR GROUP STOCK 22160N109 3,261 464 16.59 860 48.36 0.0026
2017-05-03 2017-03-31 13F COSTAR GROUP STOCK 22160N109 2,797 2,053 275.94 580 313.57 0.0015
2017-02-14 2016-12-31 13F COSTAR GROUP STOCK 22160N109 744 268 56.30 140 35.92 0.0007
2016-10-05 2016-09-30 13F * COSTAR GROUP INC COM STOCK 22160N109 476 476 0.00 103 0.0004
2016-04-22 2016-03-31 13F * COSTAR GROUP INC COM STOCK 22160N109 0 -8 -100.00 0 -100.00
2016-04-19 2015-12-31 13F/A-1 * COSTAR GROUP INC COM STOCK 22160N109 8 -227 -96.60 2 -97.50 0.0000
2016-02-10 2015-12-31 13F * COSTAR GROUP INC COM STOCK 22160N109 8 2
2015-11-13 2015-09-30 13F * COSTAR GROUP INC COM STOCK 22160N109 235 -455 -65.94 41 -71.01 0.0001
2015-08-14 2015-06-30 13F COSTAR GROUP INC COM STOCK 22160N109 690 -17 -2.40 139 -0.72 0.0004
2015-05-15 2015-03-31 13F * COSTAR GROUP INC COM STOCK 22160N109 707 686 3,266.67 140 4,533.33 0.0004
2015-03-10 2014-12-31 13F/A-1 * COSTAR GROUP INC COM STOCK 22160N109 21 21 0.00 4 0.0000
2015-02-11 2014-12-31 13F * COSTAR GROUP INC COM STOCK 22160N109 21 4
2014-11-12 2014-09-30 13F COSTAR GROUP INC COM STOCK 22160N109 0 -97 -100.00 0 -100.00
2014-08-14 2014-06-30 13F/A-1 * COSTAR GROUP INC COM STOCK 22160N109 97 51 110.87 15 114.29 0.0000
2014-08-14 2014-06-30 13F COSTAR GROUP INC COM STOCK 22160N109 97 15
2014-05-13 2014-03-31 13F COSTAR GROUP STOCK 22160N109 46 -324 -87.57 7 -89.71 0.0000
2014-04-02 2013-12-31 13F/A-1 COSTAR GROUP STOCK 22160N109 370 -7,624 -95.37 68 -94.93 0.0000
2013-11-13 2013-09-30 13F COSTAR GROUP STOCK 22160N109 7,994 -1,969 -19.76 1,342 4.44 0.0010
2013-08-13 2013-06-30 13F COSTAR GROUP STOCK 22160N109 9,963 9,963 1,286 0.0009
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
(%)
2024-08-13 2024-06-30 13F CoStar Group Option Call 0 -100.00 0 -100.00 n/a n/a n/a
2024-05-01 2024-03-31 13F CoStar Group Option Call 343 3,313 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
(%)
2025-08-14 2025-06-30 13F CoStar Group Option Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-14 2025-03-31 13F CoStar Group Option Put 300 2,377 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.