Wall Street closed lower for a third straight session on August 18, 2026, as a global bond sell-off pushed the 30-year Treasury yield to its highest level since 2007. The S&P 500 fell 0.69% to 7,691.76, the Dow slipped 0.22% to 53,343.40, and the Nasdaq Composite dropped 1.33% to 26,289.71, with semiconductor and memory chip names bearing the brunt of the decline. Home Depot's quarterly results offered one of the few bright spots in an otherwise cautious session, even as rising yields overshadowed the broader tape.

Yields Reset the AI Trade

The 30-year Treasury yield climbed to roughly 5.33%, a level not seen since 2007, as investors weighed persistent inflation, heavy government debt issuance and a surge in corporate borrowing tied to artificial intelligence buildouts. Higher long-term rates raise the discount applied to future earnings, a dynamic that hit capital-intensive chipmakers hardest. A widely followed semiconductor gauge fell around 5.5% on the session, eight times the S&P 500's decline, with memory and storage names among the worst hit as investors questioned whether valuations built on a multi-year run had outpaced near-term fundamentals, even with demand for AI infrastructure still intact and order books largely unchanged.

Memory Chip Stocks Take the Brunt

Western Digital, SanDisk, Micron and Seagate all declined between roughly 5% and 7% even though recent quarterly reports from several of the group had topped estimates. The moves reflected profit-taking after an extraordinary run: some memory names had gained several hundred percent in 2026 alone, leaving little room for anything short of flawless guidance. With bond yields rising and expectations already stretched, investors treated in-line outlooks as a reason to sell rather than hold, a pattern that has repeated at intervals throughout the year's AI-driven rally and that continues to make the sector one of the more volatile corners of the market.

Home Depot Holds the Line

Home Depot reported second-quarter sales of 47.9 billion dollars, up 5.7% from a year earlier, with comparable sales rising 1.7% and adjusted earnings per share of 4.92 dollars ahead of the prior year's 4.68 dollars. The retailer reaffirmed its full-year guidance, a signal that home-improvement demand has held up despite the softer July retail sales report released earlier in the month. For a market parsing every data point for clues on consumer health, the results offered a steadier read than the broader tape suggested on the day, even if the stock reaction was muted relative to the headline beat.

Positioning Ahead of Jackson Hole

The sell-off unfolded against a backdrop of elevated oil prices, with Brent crude trading above 92 dollars a barrel amid ongoing Middle East tensions, adding another layer of inflation concern for policymakers to weigh. With the Jackson Hole symposium and Fed Chair Kevin Warsh's keynote just over a week away, traders have limited appetite to take on additional risk ahead of a speech that could shape the rate path into year end. Until then, moves in long-dated yields are likely to remain a key driver of equity positioning, particularly for the most richly valued corners of the market.

Daily market analysis by BCM Markets.