Woe is Nokia (NOK). The Finnish cellphone maker has seen its stock fall so low that it could be a takeover target -- for a company with an appetite for risk. Nokia's U.S. shares ended the week at 2.48, a level it hasn't seen since 1996. This is after the stock rose 5.5% Friday on speculation that it could be a takeover target, possibly by Microsoft (MSFT) or a Chinese mobile phone maker, Bloomberg reported. The company's $12.4 billion in cash and