NEW YORK, Feb 12 : Investors are discovering that the artificial intelligence landscape is not just fertile ground for stocks - it is also a minefield. Enthusiasm about AI's profitability has fueled the U.S. bull market, with stock gains for technology companies and others tied to the build-out of data centers and related infrastructure. Many investors have also pointed to 2026 as the year AI will start boosting bottom lines more broadly, as companies see productivity benefits. But recent