Key Highlights

● Seagate tumbled with memory and storage peers; no company-specific news was reported.

● Concern about Chinese chipmaker CXMT's progress on advanced 4F2 DRAM fed the memory selloff.

● Investors asked how AI infrastructure will be financed, and borrowers were hit hardest.

● Western Digital reports Oct 22, the first fresh read on storage demand this season.

Storage caught in the memory storm

Seagate Technology (NASDAQ:STX) tumbled on Friday, among the steepest decliners in the technology sector on the S&P 500, according to market data. The hard-drive maker was swept up in a broad selloff in memory and storage stocks that also hit Western Digital (NASDAQ:WDC), Sandisk (NASDAQ:SNDK) and Micron Technology (NASDAQ:MU).

No company-specific news was reported for Seagate. The stock moved with its peers as investors pulled back from the companies that store the vast amounts of data used to train and run artificial intelligence models.

Seagate makes hard disk drives used heavily in data centers, where demand for high-capacity storage has climbed alongside the AI build-out. That link to AI spending helped lift storage stocks this year, but it also left them exposed when sentiment toward AI infrastructure soured.

Chinese competition and a weekly rout

The memory selloff was driven in part by concerns about competition from China. Market reports and commentary pointed to progress at Chinese chipmaker CXMT on advanced 4F2 DRAM technology, which raised fears about future pricing in memory markets.

The weekly losses in the group were steep. Market data showed sizable weekly pullbacks in SK Hynix, Sandisk and Micron. Western Digital tumbled on Friday, and Sandisk also tumbled.

The AI financing question

The memory slump fed into, and was fed by, a broader debate over AI. Market commentary described investors moving from asking what AI can do to asking how its enormous infrastructure will be financed. Companies that rely on borrowing to build data centers were hit hardest, and the worry spread to suppliers.

One market commentator wrote, "The AI group is now splitting between companies that can fund the buildout themselves and those that have to borrow." Reports also said more than $1 trillion was erased from semiconductor and AI-related stocks over the week.

The chip benchmark extended its losing streak, though reports counted it differently. All 30 members of the PHLX Semiconductor Index fell on Friday, and the index closed at 11,137.29.

Broader market retreat

The S&P 500 fell 84.62 points to 7,659.44 after opening higher, and the Nasdaq Composite dropped 572.99 points to 26,140.03. The Dow Jones Industrial Average slipped 175.28 points to 52,002.41, cushioned by gains in energy and defensive stocks. All but seven of the 75 S&P 500 technology stocks closed lower, according to market data.

Energy led the market higher, with Brent crude climbing $3.94 to $109.86 a barrel on escalating attacks on tankers in the Strait of Hormuz. Utilities and consumer staples also gained. The VIX volatility index jumped 3.53 points to 19.99, after touching 22.31 intraday, its highest since June 11.

Interest rates added to the pressure on growth stocks. The 10-year Treasury yield eased to roughly 5.1 by the close but remained near its highest levels since 2002. Federal Reserve Chair Kevin Warsh, speaking at an IMF gathering in Bangkok, declined to preview the October decision. "I don't prejudge meetings," he said.

Seagate Eyes Western Digital's Report

Western Digital, Seagate's closest rival, reports third-quarter results after the close on Thursday, Oct 22, which should offer the first fresh read on storage demand this earnings season. The Federal Reserve's next rate decision is due Oct 28, with the PCE inflation report and the first estimate of third-quarter GDP following on Oct 29. Lam Research (NASDAQ:LRCX) and Texas Instruments (NASDAQ:TXN) report Oct 21, and Meta (NASDAQ:META), a major buyer of data-center hardware, reports the same day.