US stock prices jumped to their highest levels ever on Tuesday 4 August 2026. Two big things drove the rally: companies tied to artificial intelligence (AI) reported much bigger profits than expected, and oil prices dropped sharply (The Guardian).

Three major stock market barometers all set records. The S&P 500, a basket of 500 large US companies, rose 136.02 points, or 1.8%, to close at 7,736.52. The Dow Jones Industrial Average, another widely watched index of 30 major companies, added 907.47 points, or 1.7%, closing at 54,085.88. The Nasdaq composite, which leans heavily toward technology companies, jumped 671.10 points, or 2.6%, to finish at 26,584.99 (The Guardian). Reuters independently confirmed the record highs, citing strong forecasts from companies called Caterpillar and Palantir (Reuters). CNN reported the S&P 500 surpassed 7,700 during the trading day, an intraday record as well (CNN).

Palantir Technologies, a company that builds AI software, surged 29.5% after its CEO Alex Karp said revenue leaped 93% in what he called an "otherworldly" quarter. The company also raised its forecast for the rest of 2026 (The Guardian). Caterpillar, best known for construction machinery, climbed 5.6% after posting profit and revenue that beat expectations. It was the first time Caterpillar sold more than $20 billion in a single quarter. Part of that came from increased orders for turbines that power datacenters, the large facilities that house the computers running AI systems (The Guardian).

Other companies connected to AI also rose. Nvidia gained 2.6%, Broadcom rose 6.6%, and Micron Technology advanced 7.6% (The Guardian). These gains spanned software, semiconductors (the tiny chips that power computers), and industrial equipment, suggesting that AI-driven growth is spreading across many types of businesses rather than depending on a single one.

S&P 500 companies were on track to deliver nearly 50% earnings-per-share growth for spring 2026 compared with a year earlier, according to FactSet. That is the biggest such jump since 2021 (The Guardian). The index has climbed from its first close above 7,000 on 15 April 2026 to records near 7,737 in under four months, though that path has been bumpy. In late July, the S&P 500 fell 1.5% in a single day while the Dow dropped more than 1,000 points (AP). Through July, the price of Brent crude oil swung between $72 and $102 per barrel because of uncertainty over when the conflict with Iran would allow oil tankers to safely exit the Persian Gulf (The Guardian).

On 4 August, Brent crude fell 5.3% to $79.36 per barrel (The Guardian). Reuters attributed the S&P 500's record close to strong AI-linked earnings and hopes of a Mideast deal (Reuters). CNN similarly reported that falling oil prices helped calm investor nerves (CNN). The 10-year US Treasury yield, essentially the interest rate the government pays to borrow money for a decade, fell to 4.62% on 4 August, down from 4.70% on Monday and 4.75% at the end of the prior week. When that rate falls, stocks tend to look more attractive to investors (The Guardian).

Not every stock went up. Chipotle Mexican Group fell 9.7% after it removed jalapeños from some restaurants following a salmonella outbreak, and investors worried the change could hurt future profits (The Guardian).

The rally built on gains from the previous trading session. On 2 August, the Dow jumped 693.38 points, or 1.32%, to close at 53,178.41, while the S&P 500 gained 1.48% to close at 7,600.50 (CNBC). AP had reported that S&P 500 close as a gain of 110.78 points, or 1.5%, just 0.1% below its record set earlier that summer (AP). The index then broke through to new highs on 4 August.

The broader context here is that three forces came together on the same day to push stocks to records: corporate profit growth at its fastest pace in five years, a meaningful drop in oil prices from the high levels seen during summer conflict, and a steady decline in government borrowing rates. Each of these has moved on its own in recent months. The late-July sell-off showed how quickly they can reverse when oil prices spike. Whether these record highs last will likely depend on two things: whether oil prices stay low as geopolitical tensions ease, and whether the revenue growth tied to AI, now spreading from software to semiconductors to industrial equipment, can keep up the pace that today's stock prices imply.