Platinum Investment Management’s CoStar Group CSGP Stock Holding History

Platinum Investment 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
2026 Q2	$1.13M	Sell	40,000 -37,500	-48%	-$1.29M	0.28%	74
2026 Q1	$3.13M	Buy	77,500 +12,500	+19%	+$651K	0.79%	47
2025 Q4	$4.37M	Buy	65,000 +10,000	+18%	+$708K	1.01%	37
2025 Q3	$4.64M	Sell	55,000 -10,000	-15%	-$884K	0.3%	38
2025 Q2	$5.23M	Hold	65,000	–	–	0.35%	34
2025 Q1	$5.15M	Sell	65,000 -5,000	-7%	-$380K	0.3%	31
2024 Q4	$5.01M	Buy	70,000 +20,000	+40%	+$1.51M	0.29%	36
2024 Q3	$3.77M	Hold	50,000	–	–	0.17%	48
2024 Q2	$3.71M	Hold	50,000	–	–	0.15%	47
2024 Q1	$4.83M	Buy	+50,000	New	+$4.3M	0.19%	42

Other funds holding CSGP

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

BAMCO Inc New York $66.6B AUM 7.35% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return

Baillie Gifford & Co Edinburgh, United Kingdom $110B AUM 4.8% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

ACM

AKRE Capital Management Middleburg, Virginia $5.12B AUM 19.08% 1-Year Est. Return

Polen Capital Management Boca Raton, Florida $11.6B AUM 8.03% 1-Year Est. Return

Platinum Investment Management's CSGP Position: Q2 2026 in Review

Platinum Investment Management reduced its CoStar Group (CSGP) stake by 48% in Q2 2026, selling an estimated $1.29M and leaving 40,000 shares worth $1.13M. The position accounts for 0.28% of the portfolio, ranked #74.

Platinum Investment Management first reported a position in CSGP in Q1 2024 and has held it in 10 quarters since. The position peaked at $5.23M in Q2 2025. 758 funds tracked by Wall St. Rank hold CSGP as of Q2 2026.

Platinum Investment Management held 40,000 shares of CoStar Group worth $1.13M as of Q2 2026.
Platinum Investment Management sold 37,500 CoStar Group shares in Q2 2026, an estimated $1.29M.
CoStar Group made up 0.28% of Platinum Investment Management's portfolio in Q2 2026, its #74 holding.
Platinum Investment Management first reported a position in CoStar Group in Q1 2024 and has held it in 10 quarters since.
Platinum Investment Management's CoStar Group position peaked at $5.23M in Q2 2025.
758 funds tracked by Wall St. Rank held CoStar Group as of Q2 2026.

Based on Platinum Investment Management's 13F filing for Q2 2026, filed 13 Aug 2026.