AMPL

AMPLITUDE INC

$7.00+0.31 (+4.63%)

Closing price as of Apr 21, 2026

2 superinvestors own AMPL

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Stephen Mandel	Lone Pine Capital	0.41%	1,877,000	$99.4M	2021Q4	Added
Meridian / ArrowMark	Meridian Contrarian Fund	0.38%	1,484,297	$17.2M	2025Q4	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 AMPL 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.