...Lam Research Inc. delivered a strong fourth quarter and fiscal 2025 results. China emerged as a key swing factor, and revenue from this market rose to 35% of total sales in the fourth quarter of fiscal 2025, up from 31% in the prior quarter, driven by a surge in multinational customer activity--the highest since late 2022--alongside sustained robust demand from domestic customers. Management attributed the uptick to incremental spending from a few customers but could not confirm whether it reflected tariff-related pull-forward or broader capacity expansion....