Even after a 50% drop on Tuesday morning, the company’s stock price is still up 3,092% since the Tesla head honcho’s tweet, currently hovering near $19.15 per share on Tuesday morning.īut here’s the thing: Musk didn’t mean that Signal. The tweet sent investors scrambling for shares of Signal Advance Inc., with the company’s stock price spiking from 60 cents per share last week to $38.70 on Monday. Signal’s stock price has soared over the last few days after Elon Musk, the world’s richest man, tweeted “Use Signal” last Thursday.