U.S. premarket trading on Aug. 17 showed broad gains among optical communications and AI chip-related stocks, based on BIT (Bit.com) market data. Coherent rose 3.41% to $336.932, Lumentum gained 2.35% to $947.900, Applied Optoelectronics climbed 3.67% to $155.800, Nokia added 1.58% to $10.930, and Marvell Technology advanced 2.91% to $228.470. The moves pointed to upbeat early trading sentiment across names tied to data-center connectivity and AI hardware supply chains.