CoStar Group, Inc.
MX ˙ BMV ˙ US22160N1090
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT
SecurityMX:CSGP / CoStar Group, Inc.
InstitutionAtria Investments Llc
Latest Disclosed Ownership81,821 shares
Latest Disclosed Value $ 3,300,639
Atria Investments Llc reports 100.56% increase in ownership of CSGP / CoStar Group, Inc.

On May 5, 2026 - Atria Investments Llc filed a 13F-HR form disclosing ownership of 81,821 shares of CoStar Group, Inc. (MX:CSGP) valued at $3,300,639 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 40,797 shares of CoStar Group, Inc.. This represents a change in shares of 100.56% 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.

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)
2026-05-05 2026-03-31 13F COSTAR GROUP COM 22160N109 81,821 41,024 100.56 3,301 20.31 0.0369
2026-02-05 2025-12-31 13F COSTAR GROUP COM 22160N109 40,797 -14,224 -25.85 2,743 -40.91 0.0312
2025-11-06 2025-09-30 13F COSTAR GROUP COM 22160N109 55,021 -1,771 -3.12 4,642 1.66 0.0530
2025-08-04 2025-06-30 13F COSTAR GROUP COM 22160N109 56,792 5,885 11.56 4,566 13.22 0.0539
2025-05-06 2025-03-31 13F COSTAR GROUP COM 22160N109 50,907 -2,649 -4.95 4,033 5.19 0.0517
2025-02-06 2024-12-31 13F COSTAR GROUP COM 22160N109 53,556 22,575 72.87 3,834 64.06 0.0477
2024-11-01 2024-09-30 13F COSTAR GROUP COM 22160N109 30,981 -2,090 -6.32 2,337 -4.65 0.0290
2024-08-13 2024-06-30 13F COSTAR GROUP COM 22160N109 33,071 -2,206 -6.25 2,452 -28.06 0.0317
2024-05-21 2024-03-31 13F COSTAR GROUP COM 22160N109 35,277 -8,599 -19.60 3,408 -11.14 0.0469
2024-02-14 2023-12-31 13F COSTAR GROUP COM 22160N109 43,876 75 0.17 3,834 13.87 0.0593
2023-11-07 2023-09-30 13F COSTAR GROUP COM 22160N109 43,801 -2,768 -5.94 3,368 -18.75 0.0600
2023-08-04 2023-06-30 13F COSTAR GROUP COM 22160N109 46,569 10,387 28.71 4,145 66.36 0.0748
2023-05-10 2023-03-31 13F COSTAR GROUP COM 22160N109 36,182 1,879 5.48 2,491 -6.00 0.0472
2023-01-31 2022-12-31 13F COSTAR GROUP COM 22160N109 34,303 -6,387 -15.70 2,651 -6.49 0.0543
2022-11-01 2022-09-30 13F COSTAR GROUP COM 22160N109 40,690 -291 -0.71 2,834 14.46 0.0626
2022-08-11 2022-06-30 13F COSTAR GROUP COM 22160N109 40,981 4,911 13.62 2,476 3.04 0.0519
2022-05-02 2022-03-31 13F COSTAR GROUP COM 22160N109 36,070 6,072 20.24 2,403 1.35 0.0421
2022-02-04 2021-12-31 13F COSTAR GROUP COM 22160N109 29,998 -254 -0.84 2,371 -8.91 0.0422
2021-11-16 2021-09-30 13F COSTAR GROUP COM 22160N109 30,252 8,232 37.38 2,603 42.71 0.0470
2021-08-10 2021-06-30 13F COSTAR GROUP COM 22160N109 22,020 20,482 1,331.73 1,824 44.30 0.0352
2021-05-11 2021-03-31 13F COSTAR GROUP COM 22160N109 1,538 90 6.22 1,264 -5.53 0.0280
2021-02-12 2020-12-31 13F COSTAR GROUP COM 22160N109 1,448 59 4.25 1,338 13.49 0.0323
2020-11-05 2020-09-30 13F COSTAR GROUP COM 22160N109 1,389 367 35.91 1,179 96.50 0.0358
2020-08-13 2020-06-30 13F COSTAR GROUP COM 22160N109 1,022 0 0.00 600 0.00 0.0461
2020-05-15 2020-03-31 13F COSTAR GROUP COM 22160N109 1,022 197 23.88 600 21.46 0.0461
2020-02-11 2019-12-31 13F COSTAR GROUP COM 22160N109 825 429 108.33 494 110.21 0.0134
2019-11-14 2019-09-30 13F COSTAR GROUP COM 22160N109 396 396 235 0.0084
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.