Lumentum is trading 8.9% lower at $571.11 on November 5, extending its recent decline amid sector weakness and concerns tighter data-center regulation could slow AI infrastructure demand. - Optical communications shares and semiconductor stocks were weak in premarket trading. - Under the proposed Marvell deal, Lumentum holders receive a fixed 4.5 Marvell shares; the offer’s value falls with Marvell’s stock as investors weigh the terms and completion timeline. - The strong earnings report is not an obvious explanation for the decline.