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U.S. chip and storage stocks slide; Philadelphia Semiconductor Index falls 3%

U.S. chip and storage stocks slide; Philadelphia Semiconductor Index falls 3%

Premarket and overnight weakness in AI-linked semiconductor and storage names carried into regular trading, with Micron, SanDisk, Seagate, Western Digital, Intel, AMD, Arm and others posting sharp losses.

Fact Check
The primary BlockBeats source (flash 355741) matches the claim exactly, including the specific 5.09% Sandisk figure and losses for Seagate, Western Digital, and Micron during the July 13, 2026 U.S. overnight session. A companion BlockBeats flash (355843) reports the same-day pre-market declines in the same four stocks, and independent financial coverage (247WallSt) confirms these tickers repeatedly declined together as a memory/storage group in mid-2026. Evidence is consistent and corroborated.
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Summary

U.S. semiconductor, AI-linked and data-storage stocks fell broadly on July 13, with weakness in overnight and premarket trading deepening after the open. BIT market data cited by multiple reports showed early declines in Micron, SanDisk, Seagate and Western Digital, while later MSX.COM data showed the Philadelphia Semiconductor Index down 3% in regular trading. Reported losses at different points in the day included SanDisk down 12.28% intraday, Western Digital and Seagate each down more than 6%, Micron down between 5.53% and 6.6% depending on the snapshot, Intel down 4.55%, AMD down 3.68%, Arm down 5.87%, Broadcom down 2.19%, ASML down 2.22% and Nvidia down between 0.64% and 2.16%, while TSMC rose 0.11%. One source also linked the broader selloff to geopolitical and macro concerns, including comments attributed to Trump on an Iran blockade and shipping charges, and remarks from Fed Governor Christopher Waller that persistently high core inflation could warrant considering a near-term rate hike.

Terms & Concepts
  • Philadelphia Semiconductor Index: A stock index tracking major semiconductor companies.
  • premarket trading: Stock trading before the regular session.
  • core inflation: Inflation excluding volatile food and energy prices.