MobileIron, Inc. (NasdaqGS:MOBL) is exploring options including a potential sale, according to people familiar with the matter. The stock rose as much as 21% in after-market trading. The Mountain View, California-based company is working with a financial adviser, said the people, who asked to not be identified because the matter isn’t public. No final decision has been made and the company could opt to remain independent, the people said. Representatives for MobileIron didn’t respond to requests for comment.