With an onslaught of earnings reports over the next five sessions, headlined by more than a quarter of all S&P 500 companies, the coming week looks to be one of the busiest of this second-quarter reporting season. While the handful of financial reports in the previous week helped push the S&P 500, Nasdaq and Dow Jones Industrial Average higher, market observers caution that the incoming torrent of releases may not act as a strong enough catalyst for the market to push through overhead resistance. During the previous week, the major U.S. stock averages jumped roughly 7% each on key earnings reports from several financial companies, including JPMorgan Chase ( JPM) and Citigroup ( C), as well as tech giants Intel ( INTC) and IBM ( IBM). Through Friday, 55 companies in the S&P 500 Index had reported earnings for the second quarter, with 71% reporting earnings above analyst expectations. Since 1994, 61% of companies beat estimates in a typical quarter, according to John Butters, a research analyst with Thomson Reuters. The outperformance of financial earnings in the last week helped increase the expected growth rate for S&P 500 companies to -35.2% from -35.7%, he said. Last week was only the tip of the iceberg, as only 39 S&P 500 companies reported. In the coming week, releases from 143 components of the broad-based index will come in fast and furious. Included in that number are twelve components of the Dow Jones Industrial Average, such as AT&T ( T), Microsoft ( MSFT), American Express ( AXP) and Caterpillar ( CAT). And if that isn't enough for investors clamoring for earnings, Apple ( AAPL), Morgan Stanley ( MS), Wells Fargo ( WFC), eBay ( EBAY) and Ford ( F), among many others, will report quarterly numbers.