(Bloomberg) — Gemini Space Station Inc.’s (GEMI) application for a derivatives exchange was approved by the Commodity Futures Trading Commission Wednesday, in a move that will allow the company to join the fast-growing field of prediction markets. Gemini, co-founded by billionaire twin brothers Tyler and Cameron Winklevoss, will soon allow existing US customers to trade event contracts on its website and mobile app, the company said in a blog post. In a regulatory filing prior to its initial public offeri ...