Rosenblatt analyst Brian Blair upgraded the company to a buy and hiked his price target on InvenSense stock to 20 from 15. InvenSense stock was up more than 4% in early trading in the stock market today , above 16. Shares tumbled 25% in October, to 16, after the company posted disappointing fiscal Q2 earnings and gave a lower-than-expected outlook, and the stock hasn't done much since then. But in a research report Tuesday, Blair wrote that he no longer believes InvenSense will give up "meaningful" market share to rival in the Samsung Galaxy S6.