 Shares of SOC Telemed Inc. TLMD, -9.28 skyrocketed more than four-fold -- up 339.7 -- on heavy volume in premarket trading Thursday, after the telemedicine technology provider announced an agreement to be acquired by Patient Square Capital in a deal that values the company at roughly 304.2 million. Trading volume spiked to 7.7 million shares, compared with the full-day average of about 685,000 shares. 