IAM
CSGP icon

Ion Asset Management’s CoStar Group CSGP Stock Holding History

Ion Asset Management’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
2025
Q3 		$45.1M Sell
534,000
-635,833
-54% -$56.2M 4.95% 6
2025
Q2 		$94.1M Buy
1,169,833
+1,028,933
+730% +$80.2M 5.17% 5
2025
Q1 		$11.2M Sell
140,900
-6,070
-4% -$462K 0.72% 19
2024
Q4 		$10.5M Buy
+146,970
New +$11.1M 0.61% 20

Other funds holding CSGP

Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
BAMCO Inc
BAMCO Inc New York $33.1B AUM 11.16% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $187B AUM 18.48% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
ACM
AKRE Capital Management Middleburg, Virginia $6.13B AUM 15.27% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return
Baillie Gifford & Co
Baillie Gifford & Co Edinburgh, United Kingdom $97.9B AUM 20.73% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return

Ion Asset Management's CSGP Position: Q3 2025 in Review

Ion Asset Management reduced its CoStar Group (CSGP) stake by 54% in Q3 2025, selling an estimated $56.2M and leaving 534,000 shares worth $45.1M. The position accounts for 4.95% of the portfolio, ranked #6.

Ion Asset Management first reported a position in CSGP in Q4 2024 and has held it in 4 quarters since. The position peaked at $94.1M in Q2 2025. 903 funds tracked by Wall St. Rank hold CSGP as of Q3 2025.

  • Ion Asset Management held 534,000 shares of CoStar Group worth $45.1M as of Q3 2025.
  • Ion Asset Management sold 635,833 CoStar Group shares in Q3 2025, an estimated $56.2M.
  • CoStar Group made up 4.95% of Ion Asset Management's portfolio in Q3 2025, its #6 holding.
  • Ion Asset Management first reported a position in CoStar Group in Q4 2024 and has held it in 4 quarters since.
  • Ion Asset Management's CoStar Group position peaked at $94.1M in Q2 2025.
  • 903 funds tracked by Wall St. Rank held CoStar Group as of Q3 2025.

Based on Ion Asset Management's 13F filing for Q3 2025, filed 14 Nov 2025.