Coinbase co-founder and CEO Brian Armstrong speaking at TechCrunch Disrupt SF 2018.Steve Jennings | Getty Images for TechCrunchWhen Coinbase hits the public market in the coming weeks, CEO Brian Armstrong is poised to rank among the wealthiest people in tech.Armstrong, who co-founded the cryptocurrency exchange in 2012 after working for a year at Airbnb, owns 39.6 million Coinbase shares, between his Class A and Class B holdings. His stake is worth $13.6 billion, based on an average private market share price this year of $343.58, according to the company’s updated prospectus. Unlike most tech founders, Armstrong will be able to sell shares right away …
