The Three-Circle Test: Why You Don’t Need to Be the CEO to Pick Winning Stocks
Key takeaways
- SmartAsset s free tool can match you with a financial advisor in minutes to help you answer that today.
- On a recent episode of The Investing for Beginners Podcast titled Back to the Basics: Circle of Competence, co-host Stephen Morris pitched a simple test for whether you actually understand a stock before buying it.
- Buying a stock you cannot explain in plain English means paying retail for someone else s story.
The Three-Circle Test: Why You Don’t Need to Be the CEO to Pick Winning Stocks tadamichi / Shutterstock.com Ian Cooper Sat, May 23, 2026 at 11:10 PM GMT+7 4 min read Quick Read Position size must match knowledge depth: a 2% portfolio position tolerates edge-of-competence understanding, while a 25% position demands the five-question test be answered without hesitation, because a 50% drawdown in a concentrated holding forces a 14% recovery grind across the remaining portfolio.
Your circle of competence has three rings—business mechanics (60-second explanation, customer, moat, costs, single fatal risk), industry economics, and the danger zone—and holding a stock larger than 5% of your portfolio without being able to answer all five questions means you are sized larger than your knowledge.
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