Barclays tilts chip-stock bets: Lumentum upgraded, Allegro and Penguin downgraded before earnings

Barclays moves to upgrade Lumentum to Overweight and downgrades Allegro MicroSystems to Equal Weight and Penguin Solutions to Underweight ahead of the second-quarter earnings season, saying AI infrastructure spending has boosted demand and valuations, but visions of AI-driven growth are already priced in for many semis. The firm remains optimistic about AI networking exposure and memory/optics cycles, while cautioning that near-term fundamentals may not justify lofty prices across the sector, making earnings results pivotal.