The AI rally has been pulling money in one direction for months. Funds are chasing it. Retail accounts are piling in. The question most investors are asking is how much exposure they have. Few are asking what happens when it turns. Mark Cuban is asking that question. He has been thinking about the answer for a while. Cuban laid out his view on the “Diary of a CEO” podcast. He is not predicting when the market breaks or by how much. What he is saying is that investors who go fully in during the climb have nothing left to work with when prices fall. That window, he says, is where the real money gets made. Why Mark Cuban says patience pays off more than chasing the rally Cuban has not pulled out of the market. He is not telling you to either. “You can invest a little bit for the fun of it, but be patient, have some cash because at some point it’s going to turn,” he said. His concern is the shape of the current market. AI-related stocks have climbed sharply. Price moves are increasingly driven by news cycles rather than earnings. Also read: Mark Cuban says your 401(k) is part of the healthcare problem Cuban described parts of the market as behaving like meme stocks, with large swings triggered by relatively small developments. Cuban is not arguing AI is a bad investment. He is questioning the schedule. The capital flowing in is priced for returns that may still be years away. That kind of mismatch has not typically resolved quietly. He is not trying to call a top. He wants capital available when one arrives. What Cuban learned from buying during the Covid-19 crash Cuban does not theorize about what it looks like to buy when everyone else is selling. He has done it. “During COVID I just started buying up everything when it hit. And I crushed it,” he said. When the Covid-19 selloff hit in March 2020, the investors who acted were the ones who had stayed liquid. Cuban was one of them. While others raised cash to cover losses or meet expenses, he was buying. The recovery came quickly. The window to act at the bottom was narrow. Going into that selloff fully deployed meant watching without the ability to move. What he took from that experience was not a formula for predicting the next crash. It was a conviction that having cash when others do not changes your options entirely. The setup he sees now is not identical to 2020. The catalyst will be different. The opportunity structure, if one arrives, could look similar. Mark Cuban is not advising Americans to pull out of the stock market. Bloomberg / Getty Images What today’s market reminds him of Cuban put the current environment alongside the internet bubble of 2000 and 2001. That is not a mild comparison. The dot-com collapse wiped out years of technology-sector gains and left many investors with little to show for the run-up. He said parts of the market are trading like meme stocks. A piece of news moves a price. What the company earns does not always explain where the stock lands. More Mark Cuban: Mark Cuban has strong words on taxes and wealthy Americans Mark Cuban exposes a problem with how Meta and Google fund AI Mark Cuban questions why insurance pays $2,500 for an MRI, yet it’s $350 ‘down the street’ Cuban sees money following momentum. Some of the names driving the rally do not have the earnings to back what investors are paying. That tends to matter eventually. Selling everything is not what Cuban is recommending. The point is to not go in completely. After the dot-com collapse, the investors who had cash were buyers. The ones who had gone fully in near the top had no room to act. What Cuban’s advice means for your portfolio heading into 2027 Cuban is not saying to get out. He said you can still put money in. What he is resisting is going all in. An emergency fund is a different category. That money covers a job gap, a medical bill, something the house needs. It does not go into the market. Its job is to make sure a rough stretch does not force a sale at the wrong moment. Beyond the emergency fund, your timeline changes the math. If you are not sure where you fall, a useful starting point is knowing how much of your portfolio you would need to sell to cover one year of expenses, and whether you can afford to sell it in a downturn. Years from drawing down, staying more fully invested tends to work in your favor. Closer to retirement, liquidity matters differently. Selling into a downturn to cover living expenses creates sequence-of-returns damage that sets retirement plans back years. Dollar-cost averaging is one way to stay in without committing everything at once. It limits the damage of buying at a single wrong moment. A list of names or funds you would buy at lower prices gives you somewhere to put the cash. If prices fall, you know where you are going. Margin is the other piece. Borrowed money lets a broker decide when you sell. Cuban’s argument is about keeping that decision to yourself. “When that happens, that’s when the real magic happens and where the real money is made,” Cuban said. “The delayed gratification.” Cash costs you gains when markets go up. What it buys is the ability to act when most investors around you cannot. That is the trade Cuban made in 2020. His advice heading into 2027 is to consider making the same trade now. Related: Mark Cuban sends stern warning to everyday stock investors
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