Gemini, the crypto exchange founded by Tyler and Cameron Winklevoss, will begin trading on Friday after raising $425 million in an initial public offering that signals another advance for the industry.  Shares, which trade under the ticker GEMI, priced at$28 – the high end of the expected $24 to$26 range – giving the company a market cap of about $3 billion. It is listed on the Nasdaq, which recently invested$50 million in the deal.The platform is "intended to simplify and secure the process of buying, s ...