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Wall Street Wrap: How the S&P 500, Dow and Nasdaq Performed

Wall Street Wrap: How the S&P 500, Dow and Nasdaq Performed

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Wall Street Wrap: How the S&P 500, Dow and Nasdaq Performed

October 20, 2026 | ATN Trade & Finance

Markets closed out a punishing week for technology on October 16, then staged a partial AI rebound on Monday. The picture heading into this week: a split market, a 10-year yield back above 5.15%, and oil touching $103.

The Week Ending October 17: Tech's Worst Week Since June

The S&P 500 fell 1.95% for the week to close at 7,659.44. The Nasdaq Composite dropped 4.48% — its steepest weekly decline since June — to 26,140.03. The Dow Jones Industrial Average bucked the trend, adding 0.67% to 52,002.41, while the Russell 2000 shed 3.05% to 2,721.37.

The divergence between the Dow and Nasdaq tells the story: the week was defined by a sharp rotation out of technology into defensives. The Philadelphia Semiconductor Index (SOX) fell 11.4% — its worst week since April 2025 — driven by a CXMT-related memory sector selloff that hit Micron (-14.6%), Seagate (-18.4%), and SanDisk (-17.9%). AI infrastructure neocloud stocks averaged a 22.3% weekly loss, with Cipher Digital falling 33.6% and CoreWeave shedding 15.5% in a single session after Gartner projected large impairments among AI cloud providers. Broadcom fell 9.1%; Nvidia lost 6.6%.

The defensive side of the ledger told the opposite story. Consumer staples (XLP) gained 5.0% and energy (XLE) rose 4.9% as WTI crude surged 10.4% to $101.41 on Strait of Hormuz supply disruption. Health care added 3.5%, materials 3.0%. Coca-Cola, Walmart, and Procter & Gamble all gained more than 5%.

Macro pressure amplified the move. September CPI came in at 3.7% — a tenth above forecast — with core CPI at 2.6%, also above consensus. The data briefly pushed Fed hike odds higher heading into the October 28 meeting.

Monday October 19: Bounce, but Narrow

Monday brought a partial recovery, led by megacap tech. The Nasdaq gained 1.11% to 26,430.89, the S&P 500 rose 0.41% to 7,690.73, and the Russell 2000 added 0.25%. The Dow gave back 0.07% as rate-sensitive sectors like utilities (-2.0%) and real estate (-1.2%) dragged on the price-weighted index.

Amazon jumped 4.98% after Morgan Stanley named it a top pick and following a new Trainium-compatible PyTorch tool release. Tesla gained 3.74%, Palantir 4.36%, and CoreWeave bounced 6.1% on a Goldman Sachs upgrade. The SOX ended an eight-session losing streak, rising 1.61% to 11,316.

Breadth told a more cautious story: NYSE decliners still outnumbered advancers 1,761 to 945, and the S&P 500 Equal Weight ETF (RSP) actually fell 0.32% on the day — a signal that the headline index recovery was driven by a handful of large-cap names, not broad participation. The 10-year Treasury yield rose 6 basis points to 5.15%, and WTI climbed further to $103.66 after Houthi drone attacks on Saudi energy infrastructure.

What this means: The week's damage in tech was structural, not just sentiment: AI infrastructure credit concerns, memory sector supply data, and a hot CPI print all hit simultaneously. Monday's bounce was real but thin — driven by a few mega-caps and concentrated in names most exposed to last week's selloff. With Meta, Tesla, and dozens of S&P 500 companies reporting this week, the earnings calendar will determine whether the rebound has legs or fades back into the defensive rotation.

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