Activist investor Jana Partners is urging Wolfspeed, the world’s largest maker of silicon carbide, to explore ways to improve shareholder value, including a potential sale, according to a letter reviewed by Reuters’ Svea Herbst-Bayliss. Jana, which owns what it refers to as a “significant” interest in the company, said in the letter that it is time for Wolfspeed to pursue “all avenues to improve” its performance and initiate a “comprehensive review of strategic alternatives,” the author notes. Shares of Wolfspeed are up 11.7% after the news.