A few top-rated stocks broke out of bases Friday, including a couple that moved on earnings news or a buyout rumor. Quest Diagnostics (DGX) soared as much as 20% but closed with a gain of 5.72, or 8%, to 79.60 in huge volume. Shares of the lab-testing company closed above a buy point at 78.43. A Twitter user known as @OptionsHawk posted that Quest had hired Goldman Sachs to explore a sale, Bloomberg reported.