Circle announced this month it is buying the crypto exchange Poloniex and today the Poloniex team joined Circle. 
According to Circle, "We’re proud to announce that Circle has extended its commitment to a new vision for global finance by acquiring Poloniex, a leading token exchange platform.
Built upon a foundation of blockchain technology and crypto assets, Circle is on a mission to make it possible for everyone, everywhere to create and share value. Circle Pay helps people around the globe connect to one another and share value just as they would share any other kind of content on the open borderless internet; Circle Trade serves institutions and investors as one of the world’s largest providers of crypto asset liquidity; and our forthcoming Circle Invest app enables individuals to tap into crypto asset investment through a simple, seamless, mobile experience.
Now Poloniex addresses another key element of Circle’s product foundation: An open global token marketplace."