Thompson Siegel & Walmsley’s CoStar Group CSGP Stock Holding History

Thompson Siegel & Walmsley’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	$49.4M	Buy	1,744,040 +1,128,789	+183%	+$38.8M	0.89%	32
2026 Q1	$24.8M	Buy	+615,251	New	+$32M	0.44%	75
2023 Q3	–	Sell	-3,000	Closed	-$267K	–	541
2023 Q2	$267K	Sell	3,000 -1,000	-25%	-$77.2K	﹤0.01%	339
2023 Q1	$275K	Sell	4,000 -1,000	-20%	-$73.8K	﹤0.01%	332
2022 Q4	$386K	Buy	5,000 +3,000	+150%	+$234K	0.01%	303
2022 Q3	$139K	Buy	+2,000	New	+$139K	﹤0.01%	365
2022 Q2	–	Sell	-9,000	Closed	-$599K	–	578
2022 Q1	$599K	Buy	9,000 +6,000	+200%	+$398K	0.01%	300
2021 Q4	$237K	Buy	+3,000	New	+$252K	﹤0.01%	363
2019 Q1	–	Sell	-15,000	Closed	-$506K	–	684
2018 Q4	$506K	Buy	+15,000	New	+$548K	0.01%	311
2017 Q2	–	Sell	-15,500	Closed	-$321K	–	842
2017 Q1	$321K	Buy	+15,500	New	+$315K	﹤0.01%	419
2014 Q4	–	Sell	-29,900	Closed	-$465K	–	696
2014 Q3	$465K	Sell	29,900 -40,500	-58%	-$603K	0.01%	324
2014 Q2	$1.11M	Buy	70,400 +34,900	+98%	+$565K	0.02%	275
2014 Q1	$663K	Buy	+35,500	New	+$670K	0.01%	305

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

Thompson Siegel & Walmsley's CSGP Position: Q2 2026 in Review

Thompson Siegel & Walmsley increased its CoStar Group (CSGP) stake by 183% in Q2 2026, buying an estimated $38.8M and bringing the position to 1,744,040 shares worth $49.4M. The position accounts for 0.89% of the portfolio, ranked #32.

Thompson Siegel & Walmsley first reported a position in CSGP in Q1 2014 and has held it in 13 quarters since. 757 funds tracked by Wall St. Rank hold CSGP as of Q2 2026.

Thompson Siegel & Walmsley held 1,744,040 shares of CoStar Group worth $49.4M as of Q2 2026.
Thompson Siegel & Walmsley bought 1,128,789 CoStar Group shares in Q2 2026, an estimated $38.8M.
CoStar Group made up 0.89% of Thompson Siegel & Walmsley's portfolio in Q2 2026, its #32 holding.
Thompson Siegel & Walmsley first reported a position in CoStar Group in Q1 2014 and has held it in 13 quarters since.
757 funds tracked by Wall St. Rank held CoStar Group as of Q2 2026.

Based on Thompson Siegel & Walmsley's 13F filing for Q2 2026, filed 11 Aug 2026.