ION Fund Management’s CoStar Group CSGP Stock Holding History

ION Fund 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 Q1	–	Sell	-461,000	Closed	-$31M	–	64
2025 Q4	$31M	Buy	+461,000	New	+$32.7M	3.62%	10

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

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

Principal Financial Group Des Moines, Iowa $204B AUM 27.99% 1-Year Est. Return

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

Invesco Atlanta, Georgia $1.26T AUM 61.52% 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

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

ION Fund Management's CSGP Position: Q1 2026 in Review

ION Fund Management sold out of CoStar Group (CSGP) in Q1 2026, closing a stake of 461,000 shares — an estimated $31M sold.

ION Fund Management first reported a position in CSGP in Q4 2025 and held it in 1 quarter. The position peaked at $31M in Q4 2025. 796 funds tracked by Wall St. Rank hold CSGP as of Q1 2026.

ION Fund Management reported no remaining CoStar Group position as of Q1 2026 after selling out during the quarter.
ION Fund Management sold 461,000 CoStar Group shares in Q1 2026, an estimated $31M.
ION Fund Management first reported a position in CoStar Group in Q4 2025 and held it in 1 quarter.
ION Fund Management's CoStar Group position peaked at $31M in Q4 2025.
796 funds tracked by Wall St. Rank held CoStar Group as of Q1 2026.

Based on ION Fund Management's 13F filing for Q1 2026, filed 15 May 2026.