In this episode of Summed, we deliver a complete One Up on Wall Street summary—Peter Lynch’s classic guide to finding tenbaggers by spotting everyday companies you understand, then doing focused, common-sense research. In ~20 minutes you’ll learn Lynch’s six stock categories (slow growers, stalwarts, fast growers, cyclicals, turnarounds, asset plays), how to craft a one-minute thesis, why story + numbers matters, and simple rules on valuation (including PEG checks), patience, and avoiding “diworsification.” Perfect for beginners and busy listeners who want a practical way to turn real-life insights into better investing decisions.

About the author

Peter Lynch is the former manager of Fidelity’s Magellan Fund and a bestselling author known for translating professional investing into straightforward rules for individual investors.

Key takeaways

• Invest in what you know: start with products, services, and trends you already notice.
• Six stock types: know what you own—each type has different expectations and risks.
• Tenbagger mindset: small, understandable businesses with long runways can compound massively.
• Story + numbers: a 60-second thesis backed by a few key metrics (growth, margins, debt, cash).
• PEG sanity check: growth should justify price; beware high P/E without high, durable growth.
• Ignore macro noise: focus on company fundamentals and execution.
• Avoid diworsification: add only what improves your edge or portfolio balance.
• Hold with reasons: update your thesis; sell when it’s broken, not because of headlines.

This week’s playbook

1. What-you-know sweep: list 5–10 companies you use and genuinely understand.
2. Write a 60-second story for one idea + 3 numbers to track (revenue growth, operating margin, net debt/cash).
3. Tag the type: categorize it (stalwart? fast grower?) and set expectations accordingly.
4. Do a quick PEG check and a one-page pre-mortem: “What could kill this thesis?”
5. Start a watchlist with price alerts and quarterly check-ins.

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(Education only; not financial advice.)

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