Manulife Financial Corp (NYSE:MFC – Get Free Report) (TSE:MFC) was the target of a significant increase in short interest in May. As of May 29th, there was short interest totaling 24,904,565 shares, an increase of 66.0% from the May 14th total of 15,001,396 shares. Currently, 1.5% of the shares of the company are sold short. [...]