Strong technical market indicators suggest it isn’t yet time to sell stocks. - Getty Images/iStockphoto Though a valuation bubble could develop in 2026. But, for the moment, the U.S. stock market’s uptrend is on solid footing. That’s according to Hayes Martin, president of the advisory firm Market Extremes. Martin is one of the few stock market experts I turn to for insight — and when an email from him arrives in my inbox, I pay attention. (For the record, his advisory service does not contract with my a ...