Hot inflation data and mounting data center debt worries sent tech stocks sliding, handing the Nasdaq its worst week in 18 months

The AI trade had a rough day at the office. On October 16, 2026, the S&P 500 fell approximately 1.2% to close near 7,650, while the Nasdaq Composite dropped about 2.2% to finish near 26,128.

The tech-heavy Nasdaq logged its steepest weekly decline in 18 months, capping a stretch that started with inflation surprises and ended with a debt scare.

The semiconductor index slid 1.8%, its sharpest drop since the “Liberation Day” selloff in April 2025.

Meta and Microsoft both declined, a sign the anxiety extended past pure-play hardware names into the companies doing much of the AI spending.

The biggest single casualty was CoreWeave, the data center operator backed by Nvidia . Its shares fell more than 10% on the day and are down nearly 25% across multiple trading sessions.

Yields on CoreWeave’s bonds climbed past 15% as debt pressures mounted.

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Asian semiconductor producers also fell sharply, reflecting the interconnected nature of the AI supply chain.

The trouble started earlier in the week. September’s Consumer Price Index and Producer Price Index both came in hotter than expected, raising expectations for further Federal Reserve rate hikes.

Adding to the uncertainty was scrutiny of AI lab Anthropic ’s planned IPO. The company reported a 45% sequential increase in third-quarter revenue, but that was not enough to quiet the debate over valuation.

Capital-intensive projects like data centers are especially sensitive to rate expectations. CoreWeave’s bond yields pushing past 15% may be the more telling signal, as debt markets often sniff out stress before stocks fully price it in.

If Anthropic’s listing faces tough questions despite 45% sequential revenue growth, other AI companies hoping to go public may find buyers far pickier about price.

Hotter CPI and PPI readings started this chain reaction, and the next round of prints will shape expectations for the Fed’s path.