Key takeout
- The S&P 500 dipped 0.1% on Wednesday, July 30, 2025, while the Federal Reserve maintained interest rates, raising concerns about potential tariff impacts.
- Generac Holdings experienced strong quarterly results, driven by improved margins, pushing stock prices for backup generator manufacturers significantly higher.
- IDEX stocks dropped after industrial manufacturers reported disappointing outlooks for the current quarter and year, pointing to weak demand amid economic uncertainty.
On Wednesday, major US stock indices showed mixed results as the Federal Open Market Committee adjusted interest rates, alongside new trade updates from the White House including a 50% tariff on imported copper.
The S&P 500 fell 0.1% mid-week, with the Dow Jones industrial average lowering by 0.4%. Meanwhile, the tech-heavy Nasdaq composite saw a slight gain of 0.2%.
Generac Holdings (GNRC), known for manufacturing backup generators, exceeded analysts’ expectations in its second-quarter results. The residential division saw increased sales in both commercial and industrial segments year-on-year, benefiting from improved total margins due to strong pricing and lower input costs. As a result, shares of Generac soared 19.6%, making it the top performer in the S&P 500 on Wednesday.
Teradyne (TER) shares jumped by 18.9% after the automated test equipment provider surpassed quarterly sales and profit forecasts. Solid performance in Teradyne’s semiconductor testing group was highlighted by the CEO, emphasizing the growth from system-on-chip applications for artificial intelligence.
Humana (Hum) shares climbed 12.4% after the health insurance company raised its full-year outlook, greatly exceeding second-quarter sales and profit expectations. The company provided a stronger forecast compared to Medicare Advantage Business and Centerwell’s predictions, although rising healthcare costs forced industry peers to cut or withdraw guidance over the past two years.
IDEX (IEX) shares slid 11.3% after the industrial equipment manufacturer reported quarterly revenue figures. Although the company exceeded sales and profit estimates for its equipment, its guidance for the current quarter and the full year fell short of what analysts had anticipated. They attributed this to weakened demand as clients remained cautious amid macroeconomic uncertainty.
Old Dominion Freight Line (ODFL) fell short of its second-quarter earnings and revenue expectations, resulting in a 9.7% drop in trucking company stock. The company noted that a slowing domestic economy and persistent freight market weakness negatively impacted its performance.
In a recent announcement, President Trump stated that the US would implement a 50% tariff on copper products, exempting raw copper. Following this news, copper futures—which had surged previously—seemed to drop, as shares of major copper producer Freeport-McMoRan (FCX) fell by 9.5% during the session on Wednesday.
