On July 31, Lumentum rose 7.8% in regular trading, trading at 759.98 USD/share, with turnover of $406 million. The rally was driven by Microsoft's strong earnings report, which reignited market confidence in AI computing infrastructure investment and triggered sustained capital inflows into optical communications upstream segments.

Microsoft confirmed that its AI infrastructure spending commitment remains intact, propelling the broader optical communications sector into a strong recovery after a significant pullback. The sector had previously suffered heavy selling after Corning's Q3 guidance disappointed the market, with core sales forecast upper bounds merely matching consensus expectations, sparking concerns over AI infrastructure capital expenditure pacing. Lumentum had accumulated a notable drawdown from its highs during that correction phase.

With Microsoft's validation of continued AI buildout intensity, peers rallied broadly — Applied Optoelectronics surged 14.0%, Arista Networks gained 6.94%, Ciena rose 6.36%, Nokia climbed 4.84%, and Cisco added 3.13%. Lumentum's next earnings report is scheduled for August 11 after market close, with consensus EPS expectations of $2.62.

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