Winklevoss twins-backed Gemini raised the proposed price range for its U.S. initial public offering on Tuesday and is now targeting a valuation of up to $3.08 billion in its listing, reflecting investor interest in crypto ventures. The cryptocurrency exchange aims to raise $433.3 million by selling 16.67 million shares priced between $24 and $26 each. This compares with its prior proposed range of $17 to $19 per share. The company has already lined up Nasdaq to buy $50 million in shares in a