The Dow Jones Industrial Average (DJINDICES:^DJI) has gained 31 points in premarket trading, suggesting a positive start to the stock market today. Global indexes were mixed overnight: Asian shares gained, while European stocks were down about 0.4% as of 8:30 a.m EDT.

Investors will hear from Federal Reserve Chairwoman Janet Yellen, who this morning will speak to Congress about the economy and likely provide some clues on the central bank's thinking about future interest rate hikes. In the meantime, the Dow could be driven by earnings season, as components JPMorgan Chase (NYSE:JPM) and Goldman Sachs (NYSE:GS) both delivered strong second-quarter results this morning.

Gs Ceo

Goldman CEO Lloyd Blankfein.

Goldman Sachs raked in $2 billion in quarterly profit, translating to EPS of $4.10. That result was an 11% improvement over last year's haul and a full $1.05 above what analysts were expecting. Revenue also rose to $9.1 billion, which was significantly ahead of expectations for a 7% drop. Goldman saw weakness in its institutional client services business, which fell 11% on weak demand for currency and commodity products. However, a spike in revenue from the investing and lending division more than picked up that slack.

CEO Lloyd Blankfein said in a press release that this quarter's results demonstrate the "diversity, strength, and breadth of our global franchise." Investors seem to agree and had bid up Goldman Sachs' stock by 1.5% in premarket trading.

Meanwhile, JPMorgan Chase easily beat expectations for its fiscal second quarter this morning. Profit was $1.46 per share, and revenue came in at $25.3 billion. Both of those figures were down from the year-ago period, but Wall Street analysts were expecting even worse results of $1.29 in profit and $23.7 billion in revenue.

Consistent with other major bank executives this week, CEO Jamie Dimon sounded upbeat about recent trends in the economy. In a press release accompanying the results, Dimon said that "consumers, middle market companies, and corporations are in increasingly good financial shape and the labor market is showing steady improvement." That improvement helped the bank post gains in its consumer banking business, as deposits climbed 9%. Still, weakness in JPMorgan's mortgage and financial-markets products kept overall results lower year over year. The stock was up 2.7% in premarket trading.

Leaked: Apple's next smart device (warning, it may shock you)
Apple recently recruited a secret-development "dream team" to guarantee its newest smart device was kept hidden from the public for as long as possible. But the secret is out, and some early viewers are claiming its everyday impact could trump the iPod, iPhone, and the iPad. In fact, ABI Research predicts 485 million of this type of device will be sold per year. But one small company makes Apple's gadget possible. And its stock price has nearly unlimited room to run for early in-the-know investors. To be one of them, and see Apple's newest smart gizmo, just click here!

Demitrios Kalogeropoulos has no position in any stocks mentioned. The Motley Fool recommends Goldman Sachs. The Motley Fool owns shares of JPMorgan Chase. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.