Biggest Stock Gainers Today: Biotech Breakouts and IBM–Confluent Deal Lead U.S. Market Movers (December 8, 2025)
U.S. stocks traded mostly flat on Monday as Wall Street headed into a crucial Federal Reserve meeting, but under the surface the tape was anything but quiet. While the S&P 500 and Dow Jones Industrial Average hovered around unchanged and the Nasdaq 100 eked out a small gain, small‑cap and high‑beta names ripped higher, led by a wave of biotech catalysts and a blockbuster AI‑data takeover.