U.S. stocks closed mixed on Monday, August 24, as geopolitical and trade headlines overshadowed the usual macro calendar at the start of a week dominated by two looming catalysts. The Dow Jones Industrial Average added 140.15 points, or 0.3%, to 53,417.16, while the S&P 500 slipped 21.51 points, or 0.3%, to 7,652.86 and the Nasdaq Composite fell 200.26 points, or 0.8%, to 25,980.19. The session set the tone for a week that culminates in Nvidia's earnings and the Fed's Jackson Hole symposium.

Iran Sanctions and Canada Tariffs Dominate Headlines

Treasury Secretary Scott Bessent unveiled "Operation Economic Outcast," a package of sanctions targeting more than 60 individuals, vessels and entities tied to Iran's oil sales, nuclear procurement and shipping networks, alongside new sectoral measures covering digital assets, technology, gold and aviation. Separately, President Trump said tariffs on Canadian autos, auto parts and steel would rise to 50% starting January 1, 2027, after trade talks between Washington and Ottawa collapsed. Canada's finance ministry said retaliatory tariffs would match the U.S. measures dollar for dollar. The combined effect of an intensified Iran campaign and a fresh dispute with a major trading partner added geopolitical uncertainty investors had to weigh alongside earnings and policy risk.

Chip Stocks Weigh on the Nasdaq

Semiconductor names were the session's clearest laggards, pulling the Nasdaq and the small-cap Russell 2000 lower even as the Dow held a modest gain. Micron Technology dropped 5.8%, while Advanced Micro Devices and Broadcom each fell more than 3% and 2% respectively, after a weekend report indicated Nvidia plans to raise prices on some of its AI server components. The move rattled a sector that has carried much of the market's 2026 gains and left traders parsing whether the pricing shift reflects tightening supply or an early sign that AI infrastructure demand and margins are entering a more scrutinized phase, just two sessions ahead of Nvidia's own quarterly report.

Oil Drop and Gold Rally Reflect Cross-Currents

Commodity and rates markets moved in tandem with the day's risk-off undertone. West Texas Intermediate crude fell about 1.6% to roughly $85.65 a barrel, and Treasury yields eased as oil retreated. Gold benefited from the softer dollar and lower yields, pressing to a fresh three-month high near $4,646 an ounce as investors positioned for the Fed's Jackson Hole symposium later in the week. The combination of falling oil, softer yields and a firmer gold bid pointed to a market hedging against policy and geopolitical uncertainty rather than expressing a single, clean directional view on growth or inflation.

Positioning Ahead of Nvidia and Jackson Hole

Monday's session functioned largely as a positioning day before the week's two dominant catalysts: Nvidia's earnings report after the close on Wednesday and the Jackson Hole economic symposium running Thursday through Saturday, where new Fed Chair Kevin Warsh delivers his first keynote address on Friday. With no policy track record yet to anchor expectations, traders treated the speech as a genuine two-way risk. Futures markets had pared the odds of near-term Fed action, and the mixed close on Monday, gains in the Dow against losses in the Nasdaq and Russell 2000, illustrated a market unwilling to commit firmly in either direction before the bigger news arrives.

Daily market analysis by BCM Markets.