Mattern Capital Management’s CoStar Group CSGP Stock Holding History

Mattern Capital 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	$797K	Buy	19,745 +3,282	+20%	+$171K	0.1%	120
2025 Q4	$1.11M	Buy	16,463 +3,266	+25%	+$231K	0.13%	113
2025 Q3	$1.11M	Buy	13,197 +2,134	+19%	+$189K	0.13%	113
2025 Q2	$889K	Buy	11,063 +1,173	+12%	+$91.4K	0.11%	115
2025 Q1	$784K	Buy	9,890 +1,012	+11%	+$77K	0.1%	112
2024 Q4	$636K	Buy	8,878 +1,188	+15%	+$89.7K	0.08%	112
2024 Q3	$580K	Buy	7,690 +1,541	+25%	+$117K	0.07%	108
2024 Q2	$456K	Buy	6,149 +1,751	+40%	+$148K	0.06%	117
2024 Q1	$425K	Buy	+4,398	New	+$379K	0.06%	118

Other funds holding CSGP

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

BlackRock New York $5.7T AUM 30.48% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Principal Financial Group

Principal Financial Group Des Moines, Iowa $187B AUM 18.48% 1-Year Est. Return

BAMCO Inc New York $33.1B AUM 11.16% 1-Year Est. Return

Capital International Investors

Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

Baillie Gifford & Co

Baillie Gifford & Co Edinburgh, United Kingdom $97.9B AUM 20.73% 1-Year Est. Return

Polen Capital Management

Polen Capital Management Boca Raton, Florida $14.5B AUM 5.7% 1-Year Est. Return

Geode Capital Management

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return