Are insiders buying CSGP stock?

Yes — 4 distinct insiders have bought CSGP (COSTAR GROUP, INC.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was May 4, 2026.

How much CSGP stock have insiders bought?

Insiders have bought a combined $7.1M of CSGP across 7 open-market purchases, based on SEC Form 4 filings.

What is an insider cluster buy in CSGP?

A cluster buy is two or more distinct COSTAR GROUP, INC. insiders — officers, directors, or 10% owners — each buying CSGP on the open market within a rolling window. CSGP has 1 detected cluster buy to date.

Where does this CSGP insider trading data come from?

Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

CSGP insider buying

1 cluster buy

COSTAR GROUP, INC. · Real Estate

When two or more insiders at COSTAR GROUP, INC. buy CSGP on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in CSGP plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.

Clusters

Distinct insiders

Total bought

$7.1M

Market cap

$11.7B

Detected clusters

Feb 27 – May 1, 2026
Detected May 1, 2026
High conviction2 insiders
Total bought
$5.9M
Market cap
$11.7B

All notable open-market buys in CSGP

Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.

Date	Insider	Shares	Price	Value	Filing
May 1, 2026	FLORANCE ANDREW Ccluster Director, President and CEO	68,330	$35.17	$2.4M	SEC ↗
May 1, 2026	FLORANCE ANDREW Ccluster Director, President and CEO	3,100	$35.82	$111.0K	SEC ↗
Mar 6, 2026	Sams Louise S Director	1,000	$48.36	$48.4K	SEC ↗
Mar 2, 2026	SAINT FREDERICK G.cluster President, Marketplaces	20,000	$45.33	$906.6K	SEC ↗
Mar 2, 2026	Glaser Rachel C Director	1,000	$44.94	$44.9K	SEC ↗
Feb 27, 2026	FLORANCE ANDREW Ccluster Director, President and CEO	55,720	$44.52	$2.5M	SEC ↗
Oct 25, 2024	FLORANCE ANDREW C Director, President and CEO	14,731.03	$74.67	$1.1M	SEC ↗

More Real Estate stocks with insider cluster buys

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CSGP insider buying — FAQ

Are insiders buying CSGP stock?: Yes — 4 distinct insiders have bought CSGP (COSTAR GROUP, INC.) on the open market, including 1 cluster buy where two or more insiders bought within a rolling window. The most recent qualifying activity was May 4, 2026.
How much CSGP stock have insiders bought?: Insiders have bought a combined $7.1M of CSGP across 7 open-market purchases, based on SEC Form 4 filings.
What is an insider cluster buy in CSGP?: A cluster buy is two or more distinct COSTAR GROUP, INC. insiders — officers, directors, or 10% owners — each buying CSGP on the open market within a rolling window. CSGP has 1 detected cluster buy to date.
Where does this CSGP insider trading data come from?: Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

How we track insider buying in CSGP

We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy CSGP within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?

This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding CSGP.