Daily Market Briefing — 19 August 2026

Market Recap

US markets extended their losing streak on Tuesday, with the S&P 500 slipping 0.69% to 7,691.76 and the Nasdaq 100 falling 1.68% to 29,490.96. The tech-heavy index bore the brunt as AI chip stocks pulled back sharply — Micron dropped 6.98% to 941.1 and Marvell shed 7.82% to 216.0 on concerns about elevated Treasury yields and high valuations. Stock futures were little changed overnight despite bond yields reaching fresh highs, suggesting traders are waiting for today's UK inflation print and tonight's Fed minutes before committing.

Key Movers & Themes

Tariff Reprieve: Trump paused the scheduled 50% tariffs on a wide array of Canadian goods for three days, announcing the countries are close to finalising a trade deal. The move provided temporary relief, though Trump has already imposed tariffs on Canadian metals, lumber and auto parts. Markets are treating this as a short-term positive but remain cautious about the broader trade picture.

AI Chip Selloff: Semiconductor stocks took heavy losses as analysts flagged high expectations and concerns about rising Treasury yields pressuring future earnings valuations. Lam Research fell 4.63% to 327.9, Applied Materials dropped 3.92% to 514.33, and Klac slid 5.33% to 194.8. The sector had been riding high on AI optimism, but the reality check has arrived.

Meta's Big Tobacco Moment: Meta faces a landmark youth-safety trial as US states argue the company hooked children on Facebook and Instagram. Meta countered that social media addiction does not exist. California's Attorney General clarified the case is about restitution and distortion, not extracting massive damages. Meta closed 4.42% lower at 543.82, though analysts suggest even a loss would do little to hurt Zuckerberg's empire long-term.

Chart of the Day

The S&P 500 is testing critical support at its classic pivot of 7,688.63 after three consecutive down days. The index closed just 3 points above this level on Tuesday, with the next support at S1 (7,641.12) and S2 (7,605.09). A break below 7,688 would confirm short-term weakness and open the door to 7,600. On the upside, resistance sits at R1 (7,724.66) and R2 (7,772.19). The MACD remains bullish but is showing signs of rolling over, while RSI at 50.9 is neutral. The 7,688 level is doing the heavy lifting — lose it and momentum shifts bearish.

Economic Calendar — What to Watch Today

• 06:00 GMT — UK Inflation Rate YoY (Jul): Forecast 2.9% vs 2.6% prior. This is the big one. A hotter-than-expected print could force the BoE to hold rates longer, supporting sterling but pressuring UK equities. Core inflation expected at 2.5% vs 2.6%.
• 18:00 GMT — FOMC Minutes: Markets will dissect the Fed's latest thinking on rates amid rising bond yields and persistent inflation concerns. Any hawkish tilt could pressure equities further.
• 07:10 GMT — ECB President Lagarde Speech: Watch for comments on eurozone growth and inflation trajectory.
• 14:30 GMT — EIA Crude Oil Stocks Change (Aug/14): Previous +17.422M barrels. A large build could cap oil's recent rally.

Technical Levels to Watch

The 217.4 pivot on Marvell is critical after yesterday's 7.82% drop — a break below 209.7 confirms further weakness. Dow breadth is weaker: just 4 bullish, 6 bearish, 10 mixed. Two stocks are overbought (Airbnb, Regeneron), none oversold.

Commodities & Currencies

Oil surged on Tuesday as Trump teased action in the Hormuz Strait, insisting the US controls the waterway despite ongoing attacks on transiting vessels. Brent jumped 3.49% to $91.61 while WTI gained 2.79% to $84.70. Gold edged higher to $4,390.30 as safe-haven demand ticked up, while silver fell 1.92%. Sterling strengthened ahead of today's inflation data, rising 0.34% to 1.3544 against the dollar.

Trading Outlook

Neutral to bearish. The S&P 500's 7,688 pivot is the line in the sand — hold it and we consolidate, lose it and 7,600 comes into play quickly. UK inflation at 06:00 GMT is the immediate catalyst: a hot print (above 3.0%) could spark volatility across sterling pairs and UK equities. Tonight's FOMC minutes at 18:00 GMT will set the tone for the rest of the week. Watch bond yields closely — if the 10-year Treasury pushes above 4.5%, tech stocks will struggle. Risk management is key today: keep stops tight and don't chase moves before the data drops.