Check out which companies are making headlines before the bell on Friday:

Groupon stock jumped after legendary investor Bill Miller said he likes the stock. Miller said Groupon has $1.2 billion in cash, no debt, and is cheap. Miller likes the "low expectations" and said his average cost is about $5. "I'm more attracted to the stuff that has warts on it," he said. Miller also likes Apple, Texas Instruments, and US Airways.