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Yes, Circle bought them. Circle ran and/or runs an over-the-counter market for trading bitcoin, I think, and decided to expand into the general exchange business with the acquisition of Poloniex. I guess it didn't work out for them.

Ahh, they don't trade Steem anymore so good riddance I suppose. Haven't touched Poloniex in at least 2 1/2 or 3 years.

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