The S&P 500 has ridden a massive wave of growth over the last four years, more than doubling in value thanks largely to the explosion of artificial intelligence. Companies like Nvidia and Palantir have seen astronomical climbs, while giants like Amazon and Alphabet continue to pour billions into AI infrastructure despite seeing temporary dips in free cash flow. While the promise of future rewards remains strong, many analysts worry that the market is becoming dangerously overpriced as investors pay more for expectations than for actual current earnings.

One alarming signal comes from the Buffett indicator, a metric created by Warren Buffett that compares the total stock market value to the U.S. gross domestic product. Historically, Buffett warned that values approaching 200 percent were akin to playing with fire. Currently, that number sits at a staggering 297 percent. While this isn’t a guarantee of an immediate collapse, it serves as a loud warning bell for investors to prepare for potential volatility rather than assuming the climb will continue indefinitely.

History suggests that the most successful investors during a downturn are those who enter the fray with liquid capital. When markets crash, high quality stocks often go on sale, providing rare opportunities for those with cash on hand to buy assets at a discount without being forced to sell existing losers at a loss. For many, this means now is the ideal time to look at their portfolios and consider trimming positions in high growth stocks that have surged in value.

Rebalancing is key here, especially for those whose portfolios have become overly concentrated in a single winner like Nvidia. By locking in some profits now and diversifying their holdings, investors can create a safety net of cash reserves. The goal isn’t necessarily to stop investing entirely since timing the exact peak of a market is nearly impossible, but rather to ensure they have the ammunition necessary to capitalize on opportunity when others are panicking.