AMD Tumbles 10-13% as Intel's Weak PC Outlook and Poor Guidance Drag Semiconductor Sector Lower

AMD shares fell between 10% and 13% on October 30, 2026, as a broad semiconductor selloff triggered by Intel's dismal earnings guidance erased billions in market value across the chip sector. Intel dropped roughly 25-30% after reporting a weak PC market outlook and struggling AI server chip supply, dragging peers including AMD, Nvidia (down about 2.8-3%), Broadcom (down about 3.9%), and Arm Holdings (down about 7-10%) sharply lower. The Philadelphia Semiconductor Index (SOXX) fell approximately 10% on the session, one of its worst single-day performances in recent memory.

Investors are now closely watching whether AMD faces the same dual headwinds Intel flagged: a softening PC market and constraints in AI server chip production. Intel warned that the PC slowdown is expected to persist at least through the first half of next year. Bank of America, which downgraded Intel to Neutral following the results, flagged an increasingly negative read-across for AMD specifically, citing PC and supply headwinds that it believes will more than offset any benefit AMD derives from the agentic AI wave. AMD has now fallen roughly 24.3% from its 52-week high.

AMD is scheduled to report its own quarterly results on November 3, and the stakes are high. The company's most recent data center revenue doubled year-over-year, rising 107%, with major customers including OpenAI, Meta, and Anthropic. Anthropic's S-1 filing confirmed a non-cancellable hardware supply agreement worth more than $20 billion with AMD. Separately, AMD invested $1 billion in Meta's equity raise, deepening a compute-for-equity partnership that analysts say signals strong strategic alignment in AI infrastructure. AMD's Helios rack-level AI solution is reportedly shipping ahead of schedule.

Despite those AI tailwinds, at least one analyst rates AMD a Sell at its recent price of $578.44, estimating intrinsic value at roughly $300 per share based on stretched cash flow multiples and dilution risks. On October 28, the iShares PHLX SOX Semiconductor ETF sold $147.2 million worth of AMD, while 37 other ETFs added to their AMD positions on the same day, illustrating the divided sentiment heading into next week's earnings report.

In the PC memory market, TrendForce data adds further context to the sector pressure: notebook shipments fell 14% quarter-over-quarter in the third quarter of 2026 and are projected to fall another 9% in the fourth quarter. OEM DRAM inventories climbed to 7-10 weeks in early Q4 from 6-9 weeks at the end of Q3, and Korean DRAM suppliers are planning to cut PC DRAM shipments by more than 20% year-over-year in 2027, with cuts potentially deepening beyond 40% as capacity shifts toward server memory. Separately, reballed DDR4 paired with AMD Picasso processors is gaining traction among Tier-2 OEMs shifting toward white-label models.