The notable decline in Lam Research shares reflects a broader technology and semiconductor sector sell-off as investors reassess high valuations across the artificial intelligence value chain. While optimistic forward guidance from industry peers initially boosted the sector, the rally quickly faded. Market participants have grown increasingly concerned about the massive capital expenditures required for AI infrastructure and whether consumer technology giants can monetize these investments quickly enough. As downstream companies adjust prices to counter rising chip and memory costs, the market has adopted a more cautious stance, triggering profit-taking across the entire chip-equipment landscape.

As a global leader in wafer fabrication…