ONE LEVEL DEEPER
FTNT
Warren Buffett frameworkThe Owner-OperatorBenjamin Graham frameworkThe Value ArchitectMichael Mauboussin frameworkThe Expectations EngineerHoward Marks frameworkThe Cycle WhispererPeter Lynch frameworkThe Everyday Edge

With 14.7% revenue growth but 20 straight quarters of insider selling, this fast grower fails Lynch's smell test.

cautiousLeaning Bullishconviction

A fast grower with a clear cybersecurity story, but insiders selling for 20 straight quarters while the PEG ratio approaches 2.0 raises classic Lynch red flags.

THE LENSES
THE CLASSIFICATIONpromising

Is this a slow grower, stalwart, fast grower, cyclical, turnaround, or asset play?

Revenue grew 14.7% YoY in Q4'25 with consistent double-digit growth
Security Subscription revenue increased from 35.8% to 38.7% of total
Operating margins expanded to 32.8% from 29.5% in Q1'25
Gross margins stable at 79.6% across all quarters

This framework classifies Fortinet as a fast grower — Lynch's favorite category. The 14.7% revenue growth with expanding subscription revenue and improving margins fits the profile of companies that can become 10-baggers.

Revenue
THE GROWTH STORYclear

Can you explain the growth to an eleven-year-old?

Security Subscription segment at 38.7% of revenue provides recurring cybersecurity protection
Geographic diversification: Americas 39.7%, EMEA 41.7%, APAC 18.6%
Revenue correlates 0.993 with inflation and -0.867 with consumer sentiment
Product revenue at 32.6% complements subscription base

The story is simple: Fortinet sells cybersecurity that companies need more when the world feels dangerous. Revenue grows with inflation and thrives during uncertainty — a clear narrative Lynch would appreciate.

Revenue by Segment
THE PEG RATIOexpensive

Is the P/E ratio justified by the growth rate?

P/E ratio of 29.15 with 14.7% revenue growth
Earnings grew from $1.75 in Q1'25 to $2.83 in Q4'25
PEG ratio approaching 2.0 (29.15 P/E / ~15% growth)
Market implies only 5.06% perpetual growth vs 14.2% trailing

Applying this framework's PEG analysis shows Fortinet trading near 2.0 — Lynch's danger zone. The market pays nearly double what growth alone justifies, requiring perfect execution to avoid disappointment.

P/E Ratio
WHAT THE INSIDERS KNOWalarming

Are insiders buying their own stock?

20 consecutive quarters of net insider selling through Q1'26
Brief reversal in Q2'25 with 1.7M share purchase
Net selling of shares despite $6.5B in company buybacks
CEO Ken Xie received $15.1M in stock awards with only $622K salary

This framework sees a massive red flag: insiders have sold for 20 straight quarters. Lynch teaches that insiders sell for many reasons but buy for only one — they think it's going up. Here they clearly don't.

Insider Net Buying/Selling
KEY NUMBERS
VERDICT

Applying the Lynch framework reveals a fast grower with a simple story — cybersecurity thrives when the world feels dangerous — but two major warnings flash red. The PEG ratio near 2.0 says you're paying too much for the growth, while 20 quarters of insider selling says those who know it best don't like the stock. Lynch taught us to listen when insiders vote with their wallets. At these levels, would Lynch wait for a better price?

This analysis applies Peter Lynch's published investment framework to publicly available financial data. It is not authored by, endorsed by, or affiliated with Peter Lynch. Educational purposes only. Not financial advice.

OTHER PERSPECTIVES
Warren Buffett framework
The Owner-Operator
Bullish
Michael Mauboussin framework
The Expectations Engineer
Bullish
Benjamin Graham framework
The Value Architect
Neutral
Howard Marks framework
The Cycle Whisperer
Leaning Bearish
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