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Andreas Halvorsen’s CoStar Group CSGP Stock Holding History

Andreas Halvorsen’s Portfolio CSGP Stock Details CSGP Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		– Sell
-1,442,582
Closed -$97M – 82
2025
Q4 		$97M Sell
1,442,582
-407,147
-22% -$28.8M 0.26% 67
2025
Q3 		$156M Sell
1,849,729
-1,368,839
-43% -$121M 0.41% 61
2025
Q2 		$259M Buy
+3,218,568
New +$251M 0.75% 51
2025
Q1 		– Sell
-1,162,703
Closed -$83.2M – 101
2024
Q4 		$83.2M Sell
1,162,703
-98,492
-8% -$7.44M 0.27% 67
2024
Q3 		$95.1M Buy
+1,261,195
New +$95.6M 0.35% 65
2021
Q1 		– Sell
-709,490
Closed -$65.6M – 103
2020
Q4 		$65.6M Sell
709,490
-2,291,970
-76% -$201M 0.18% 78
2020
Q3 		$255M Buy
+3,001,460
New +$239M 0.92% 35

Other funds holding CSGP

Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return
BAMCO Inc
BAMCO Inc New York $66.6B AUM 7.35% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return
Baillie Gifford & Co
Baillie Gifford & Co Edinburgh, United Kingdom $110B AUM 4.8% 1-Year Est. Return
Polen Capital Management
Polen Capital Management Boca Raton, Florida $11.6B AUM 8.03% 1-Year Est. Return

Andreas Halvorsen's CSGP Position: Q1 2026 in Review

Andreas Halvorsen sold out of CoStar Group (CSGP) in Q1 2026, closing a stake of 1,442,582 shares — an estimated $97M sold.

Andreas Halvorsen first reported a position in CSGP in Q3 2020 and held it in 7 quarters. The position peaked at $259M in Q2 2025. 796 funds tracked by Wall St. Rank hold CSGP as of Q1 2026.

  • Andreas Halvorsen reported no remaining CoStar Group position as of Q1 2026 after selling out during the quarter.
  • Andreas Halvorsen sold 1,442,582 CoStar Group shares in Q1 2026, an estimated $97M.
  • Andreas Halvorsen first reported a position in CoStar Group in Q3 2020 and held it in 7 quarters.
  • Andreas Halvorsen's CoStar Group position peaked at $259M in Q2 2025.
  • 796 funds tracked by Wall St. Rank held CoStar Group as of Q1 2026.

Based on Viking Global Investors's 13F filing for Q1 2026, filed 15 May 2026.