Crypto exchange Gemini, led by the Winklevoss twins, raised $425 million in its IPO, pricing shares at $28 – above the $24-$26 range. The Nasdaq-listed firm, ticker GEMI, is valued at $3.3 billion. Backed by Nasdaq's $50 million investment, Gemini holds $21 billion in assets and has processed $285 billion in trading. Retail sentiment is 'extremely bullish'.