Broadcom's shares soared 12 per cent in premarket trading on Friday as the semiconductor maker's strong revenue forecast helped restore some confidence in AI chip demand after a bruising sector-wide selloff following rival Marvell Technology's bleak outlook. The rosy forecast from Broadcom - the biggest supplier of custom AI chips to Big Tech - could help refuel a sputtering AI stock rally that has been hit by worries over hefty spending on AI infrastructure sparked by low-cost breakthroughs