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Warren Buffett’s 4 Rules for a Shaky Stock Market (and 4 Warning Signs to Watch)

4 min readOct 28, 2026

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Debt-fueled stocks, a top-heavy S&P 500, and a flashing Buffett Indicator. Here’s how to stay rational.

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Is the Market Overvalued? What Warren Buffett Would Tell You to Do

Since 1965, Berkshire Hathaway stock has compounded at roughly 20% a year, about double the S&P 500. Over decades, that gap adds up to a return in the millions of percent versus tens of thousands for the index.

Today, AI stocks are posting record valuations, debt is climbing, and a handful of companies dominate the market. If that makes you uneasy, Buffett’s playbook is a good place to start.

TL;DR: Four red flags suggest the market is stretched: rising leverage, extreme concentration, a high Buffett Indicator, and a surge in speculative retail trading. Buffett’s four answers: buy businesses, stay in your circle of competence, demand a margin of safety, and trade far less.

Warning Sign #1: Stocks Bought With Borrowed Money

Margin debt has outpaced the broader market for about 30 years, so more and more of the market’s value rests on borrowed money. Households are also leaning on debt to cover everyday costs as inflation squeezes budgets…

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Ali Ahmad📝
Ali Ahmad📝

Written by Ali Ahmad📝

Learn how money shapes your mind, discover hidden financial habits, build smarter decisions, understand wealth psychology, and grow financially with confidence