Why Lumentum's stock led the S&P 500 higher on Monday

What happened

Lumentum's stock led S&P 500 gainers on Monday, rising 8.2% at the close. Fellow optical connectivity maker Coherent finished up 5.8%, and Ciena climbed 4.9%, as optical stocks recovered from the previous week's declines.

Confirmed

Global impact / market context

The rebound shows investors quickly returning to optical networking shares, which connect data centers and carry AI traffic. Gains across Lumentum, Coherent and Ciena suggest buyers favored the whole sector, not one company, after Anthropic's IPO filing and healthy AI earnings.

Analyst inference

Analyst Amit Daryanani cited renewed interest in optics after last week's selloff. He said investors may have waited for Anthropic's S-1 filing, which means its IPO registration document, before buying back in. Meta's equity raise and SpaceX's $40 billion AI hardware financing signaled durability.

Analyst inference

What to watch

1. The article mentions expectations that the Federal Communications Commission, which regulates U.S. communications, will limit imports of optical transceivers from foreign suppliers early next year; the text ends there. Confirmed
2. Watch whether regulators actually propose or adopt limits on foreign-made optical transceivers, since such a rule could reshape where network equipment suppliers buy components and how they price products. Proposed
3. Track Anthropic's IPO progress and further AI earnings for signs investors keep funding the trade; weaker results could reverse the optical rebound, while Meta and SpaceX spending supports demand for chips and networking gear. Analyst inference

Evidence

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