CSGP

COSTAR GROUP INC

12 superinvestors own CSGP

Based on latest 13F filings — data is 45–90 days delayed

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Chuck Akre	Akre Capital Management	6.80%	10,348,273	$417.4M	2026Q1	Added
Dennis Hong	ShawSpring Partners	5.11%	339,081	$13.7M	2026Q1	Reduced
Polen Capital Management	Polen Capital Management	3.51%	12,570,368	$507.1M	2026Q1	Added
Daniel Loeb	Third Point	2.93%	3,165,000	$212.8M	2025Q4	Added
Triple Frond Partners	Triple Frond Partners	2.36%	122,027	$3.7M	2009Q1	Held
Wallace Weitz	Weitz Investment Management	1.46%	517,025	$20.9M	2026Q1	Reduced
Chase Coleman	Tiger Global Management	0.26%	1,500,000	$60.5M	2026Q1	Reduced
Viking Global Investors	Viking Global Investors	0.26%	1,442,582	$97.0M	2025Q4	Reduced
Hillman Capital Management	Hillman Value Fund	0.24%	8,557	$345K	2026Q1	New
First Eagle Investment Management	First Eagle Investment Management	0.01%	19,270	$1.3M	2012Q1	Added
Kenneth Fisher	Fisher Asset Management	0.00%	73	$6K	2023Q4	New
Meridian / ArrowMark	Meridian Contrarian Fund	0.00%	2,375	$200K	2025Q3	Reduced

Open-market purchases (P) and sales (S) from SEC Form 4 filings · last 12 months

No open-market insider trades in the last 12 months.

Form 4 filings for option exercises and other transaction types are excluded.

STOCK Act disclosures · last 12 months

Congressional trade data coming soon.

We are sourcing STOCK Act disclosures and will display them here shortly.

What Is SEC Form 4?

Understand the insider trade filings behind CSGP activity.

What Is a 13F Filing?

How superinvestors disclose their quarterly holdings.

Insider Cluster Buying

Why multiple insiders buying together is a strong signal.

Superinvestor Consensus

The most widely held stocks across all tracked institutions.