JPMorgan's Market Intelligence group, led by Andrew Taylor, has advised investors to exercise caution with speculative tech stocks following a significant rally. Goldman Sachs' basket of unprofitable tech stocks surged 27% in May, outperforming the Nasdaq 100 Index by 17 percentage points, marking its best performance since November 2020. Year-to-date, this portfolio has climbed 57%, compared to an 11% gain in the S&P 500. Taylor suggests that investors should consider shifting their focus to more established tech companies, especially as rising bond yields could adversely affect smaller, loss-making firms. He also highlighted that stock buybacks by larger, profitable tech companies could facilitate a transition towards higher-quality investments.