FactSet said that 272 S&P 500 companies have reported quarterly results so far, and 65% have come in above the mean estimate. That percentage is a bit skewed, however, because roughly 20% of companies warned ahead of their reports, lowering the bar in many cases. On a valuation basis, FactSet estimates the current 12-month price-to-earnings ratio for the S&P 500 at 12.4, which is below the 10-year average of 14.6.Switching gears, it's always interesting to look at which stocks don't participate in a broad rally like the one seen on Friday. Research In Motion ( RIMM) was one whose presence was notably absent as the stock dipped nearly 2% following a downgrade by Jefferies. Another stock showing weakness was Best Buy ( BBY), which lost 1.8% to $23.86 after Bank of America Merrill Lynch cut its price target on the shares to $19, arguing that Apple's ascendance is a problem for the company. "We view Apple's record-breaking results last week as a very negative indicator for BBY," said the firm, which has an underperform rating on the stock. "Increased sales of Apple products by BBY would be negative for margins. More importantly, with Apple's own retail sales up 61% in the quarter, we believe traffic at BBY stores was hurt, with more people choosing to shop in AAPL stores." B of A Merrill Lynch also found warning signs in news from RadioShack ( RSH) and Amazon.com ( AMZN), saying Best Buy could be affected by weak Sprint ( S) activations the way RadioShack was and that poor sales of game consoles through Amazon bode poorly as well as the firm estimates as much as 13% of Best Buy's revenue comes from gaming. Best Buy shares are down 32% in the past year, and if Apple's dominance is a bad thing for the company, more pain likely lies ahead for shareholders. Check out TheStreet's quote page for Best Buy for year-to-date share performance, analyst ratings, earnings estimates and much more. Moving on to Monday's scheduled news, Coinstar ( CSTR) is reporting its fiscal fourth-quarter results after the closing bell and the average estimate of analysts polled by Thomson Reuters is for a profit of 64 cents a share in the December-ended period on revenue of $498.1 million.