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Real-time SEC & RNS filings
Track what insiders buy
before the crowd notices
When corporate directors spend their own money buying shares, it's one of the strongest signals in investing. DipBuster surfaces every cluster buy — UK and US — as soon as the filing hits.
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✓ UK + US markets
✓ Free forever tier
Example insider cluster signal
GameStop (GME) · January 2026
Signal Type
🔔 Insider Cluster Buy
2 directors in 48 hours
Total purchased
$21.9M
CEO + Director
DipBuster Score
81/100
HIGH confidence
Historical accuracy
68%
12-month outperformance (Seyhun 1986)
Everything you need to act on insider signals
Cluster detection
Flags when 2+ insiders buy the same stock within 48 hours — the most predictive signal type per academic research.
Real-time filing alerts
SEC Form 4 and UK RNS filings processed within minutes. Be first, not last.
Full signal context
See the insider's role, exact amount, whether near earnings, and your margin of safety.
UK + US coverage
LSE, AIM, NYSE and NASDAQ — rare for a single platform. Most tools only cover US.
Graham NCAV screen
Combine insider signals with net-net value screens. When both align, it's rare and powerful.
Email alerts
Get notified the moment a qualifying signal fires. Free tier included.
Start tracking insider moves today
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Common questions
Is this legal to act on?
Yes. Insider trading filings are public record — required to be filed with the SEC (US) and disclosed via RNS (UK). We're surfacing public information faster than you'd find it yourself.
How current is the data?
US Form 4 filings: typically within 30–60 minutes of the SEC accepting them. UK RNS: checked hourly during market hours.
Why is this better than just watching EDGAR?
EDGAR is a raw dump of thousands of filings. DipBuster filters to cluster signals (two or more insiders), scores them, and combines with NCAV and momentum data — saving hours of manual work.
What's free vs paid?
The free tier includes leaderboard access, basic DipBuster Scores, and alert sign-ups. Pro (£5/month) adds individual stock deep-dives, full insider history, unlimited watchlists, and DCF tools.