ClearBridge Advisors

Since ChatGPT was first released in 2022, the artificial intelligence (AI) trade has dominated US equity markets. Gains have been driven by three interrelated forces: enthusiasm for artificial intelligence, growing concentration in the largest technology companies and strong price momentum.

Some investors are questioning how much further this year’s rally can run with the S&P 500 Index up 12.3% through the first eight months of the year. Encouragingly, history suggests that strong starts tend to persist; when the S&P 500 has gained more than 10% through August it has advanced from September through December in 25 of 28 instances, an 89% positive hit rate.

Many of the most critical components of AI infrastructure are produced by a small and increasingly consolidated group of highly specialized companies.

US equities continued to climb higher in May, with the S&P 500 Index rising 5.1%. Further de-escalation of geopolitical tension in the Middle East has paved the way for the market’s 19.5% advance from the late-March lows.

ClearBridge Investments believes tariffs remain the key risk to corporate profits in the second half of the year and is less concerned about geopolitical events or the outlook for fiscal and monetary policy.