# Semiconductor index falls more than 3% in AI hardware sell-off

_Published Monday, September 28, 2026 at 11:21 AM EDT · Products · Latest · Tier 2 — Notable_

![Semiconductor index falls more than 3% in AI hardware sell-off — Primary](https://resource.tradingkey.com/uploads/20260608/Micron-98572b9fe3894abab71913abd5864c14.jpg)

The Philadelphia Semiconductor Index fell more than 3% on September 28 as shares of several AI hardware suppliers declined, TradingKey reported. Micron fell 4.22%, AMD fell 5.37% and SK Hynix fell 6.20% in the trading covered by the report.

TradingKey linked the sell-off to concern that a reported pause in OpenAI model training could delay demand for computing hardware. That connection is the outlet's market analysis; the reported share-price moves do not establish when chip orders or hardware spending might change.

## Sources

- [tradingkey.com](https://www.tradingkey.com/analysis/stocks/us-stocks/262190120-openai-pauses-training-ai-chip-stocks-plunge-nasdaq-sandisk-micron-intel-tradingkey)

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Canonical: https://techandbusiness.org/newswire/o5rxN5ZJ6F_xoZ3xqkT6Bj
Published: 2026-09-28T15:21:07.399Z
Story chronology: 2026-09-28T15:08:24.000Z
Retrieved: 2026-09-28T16:41:39.884Z
Publisher: Tech & Business (techandbusiness.org)