Lumentum falls 5.5% premarket, Marvell drops 3.3%

The item gives no stated catalyst, which is itself the notable detail: two optical and networking chip suppliers moving lower premarket without an attributed driver suggests sector-wide positioning rather than company-specific news. Lumentum's larger decline relative to Marvell hints the pressure is concentrated in optical component exposure rather than networking silicon broadly, though the material is too thin to confirm that read. What matters next is whether the weakness holds into the regular session or reverses at the open, and whether other names in the same supply chain show similar premarket moves.