The U.S. stock market is experiencing a significant bull run, with the S&P 500 index nearing all-time highs in mid-August. This surge, contributing to substantial gains for retirement accounts like 401(k)s, is largely propelled by robust corporate earnings and intense spending on artificial intelligence infrastructure. Several major investment banks have raised their year-end targets for the S&P 500, with JPMorgan joining Goldman Sachs, Morgan Stanley, and Deutsche Bank in predicting the index could reach 8,000 by the close of 2026.
This optimism is fueled by an exceptionally strong earnings season. Corporate results for the April-to-June quarter showed S&P 500 companies achieving an average earnings increase of 50 percent, with 85 percent exceeding Wall Street expectations. This performance marks the best earnings season since the U.S. economy's recovery in 2021, with AI infrastructure and semiconductor outlays being key drivers.
"Overall I think we're in a bullish trend," Laffer Tengler Investments CEO Nancy Tengler told the Daily Mail. "I think this is one of the best tapes I've seen in my career since the 1990s."
However, analysts caution that much of the market's impressive growth is concentrated in a few mega-cap technology companies. When the contributions of giants like Alphabet and Amazon are excluded, the S&P 500's earnings growth rate drops significantly, from 50 percent to 32 percent. Removing all mega-cap stocks further reduces the growth rate to 26 percent. The median S&P 500 company is experiencing earnings growth closer to 12 percent, highlighting a widening gap between these AI leaders and the broader market.
Despite the strong performance, several factors could disrupt the market's upward trajectory. Persistent inflation, a potentially weakening labor market, and geopolitical instability in the Middle East present headwinds. The July Consumer Price Index report indicated that while price gains are not worsening, they are not receding quickly enough, remaining above the Federal Reserve's 2 percent target.
The prospect of interest rate hikes by the Federal Reserve is also a concern. With odds of a September rate hike near 50-50, disappointing jobs and GDP data are creating debate about the urgency for the Fed to act. While an in-line CPI report has lessened the immediate threat of an inflation surprise, a significant rise in oil prices could reignite inflationary pressures and prompt more aggressive monetary policy.
For the time being, strong earnings growth and a resilient consumer continue to serve as the primary catalysts for the stock market's advance, with the S&P 500 index having delivered a nearly 18 percent return in the previous year and around 25 percent the year before that. An S&P 500 index fund investment would have grown by over 50 percent in the last three years.