Marvell Technology Group is trading 4.22% lower at $254.65 on October 13 amid semiconductor-sector weakness; available reporting identifies no clear new company-specific catalyst. - The decline extends the previous session’s 3.42% loss. - Chip stocks fell amid concerns about Chinese competition after reports of CXMT’s chip-design advances, alongside renewed worries about AI investment and valuations. - The supplied sector context reports SOXX down 2.64% during the regular session.