Cramer says Thursday's AI sell-off proves the value of this age-old investing strategy

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Mad Money

Published Thu, Oct 8 20266:15 PM EDT

Key Points

• CNBC’s Jim Cramer said Thursday’s sell-off in AI stocks underscores the importance of diversification, even when it means holding stocks that have struggled.
• He warned that investors who concentrate too heavily in one sector risk panic-selling during downturns, potentially missing out on a market recovery.

Thursday's sell-off in artificial intelligence stocks served as a reminder of why diversification is essential to staying invested through market volatility, according to CNBC's Jim Cramer.

Tech shares came under pressure after the Financial Times reported that OpenAI's annualized revenue was about $20 billion below the amount previously signaled. Oracle tumbled 5.5% and Broadcom dropped 4.35%. Meanwhile, beaten-down stocks outside the AI trade, including Home Depot, rallied as Treasury yields eased following a solid 30-year bond auction. Cramer's Charitable Trust, the portfolio run by CNBC's Investing Club, owns shares of Broadcom and Home Depot.

"If you had nothing but artificial intelligence stocks, today would've been a nightmare," the "Mad Money" host said.

The danger of a concentrated portfolio, Cramer explained, is that steep losses could prompt investors to panic, sell their holdings and retreat to cash, potentially missing a subsequent recovery. He argued a diversified portfolio can help cushion losses when a particular investing theme gets hit and make it easier to stay invested.

The cost of missing a market rebound can be substantial. According to JPMorgan, an investor who put $10,000 into the S&P 500 and missed its 10 best trading days between 2005 and 2024 would have ended up with less than half the wealth of someone who stayed fully invested.

"Do you know how much I've hated owning Home Depot?" Cramer said. "The answer is about as much as I loved it today. Because it's keeping me in the game on days like this one."