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CSGP insider trading

COSTAR GROUP, INC. — open-market insider buys and $1M+ sells from SEC Forms 3, 4 and 5.
Insider buys · 24 mo
7
Bought · 24 mo
$9.6M
Buys · last 90 days
1 · $2.5M
Most recent buy
2026-08-05

Cluster buy detected

4 insiders bought CSGP within a short window (2026-02-27→2026-03-06), $3.5M in total — cluster score 80/100. Members see the buyers, the score breakdown and the chart.

See the cluster

Recent insider filings

FiledInsiderTypeSharesPriceValue
2026-08-05FLORANCE ANDREW C
Founder and CEO
Bought83,300$29.89$2.5M
2026-05-04FLORANCE ANDREW C
President and CEO
Bought71,430$35.20$2.5M
2026-03-09Sams Louise Scluster
Director
Bought1,000$48.36$48k
2026-03-03Glaser Rachel Ccluster
Director
Bought1,000$44.94$45k
2026-03-03SAINT FREDERICK G.cluster
President, Marketplaces
Bought20,000$45.33$907k
2026-03-02FLORANCE ANDREW Ccluster
President and CEO
Bought55,720$44.52$2.5M
2025-09-02SAINT FREDERICK G.
President, Marketplaces
Sold25,000$90.33$2.3M
2025-07-29SAINT FREDERICK G.
President, Marketplaces
Sold25,000$93.23$2.3M
2025-06-12SAINT FREDERICK G.
President, Marketplaces
Sold25,000$81.10$2.0M
2024-10-28FLORANCE ANDREW C
President and CEO
Bought14,731$74.67$1.1M
2024-10-28KLEIN MICHAEL R
Director
Sold71,633$74.69$5.4M

Most active insider buyers

InsiderRoleBuysTotal bought
FLORANCE ANDREW CFounder and CEO4$8.6M
SAINT FREDERICK G.President, Marketplaces1$907k
Sams Louise SDirector1$48k
Glaser Rachel CDirector1$45k

See CSGP on the chart

Every insider buy and sell for CSGP plotted on the price, the full two-year history, cluster scores and daily updates — in the members area, $29/month. A free quarterly sample of the whole dataset needs no account.

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Data from the SEC EDGAR ownership filings, refreshed daily. Only open-market purchases (transaction code P) and sales of $1M or more are shown; grants, option exercises and tax withholding are excluded because they run on schedules set years earlier. Not investment advice.