Sequoia Capital China said to lead $400m pre-IPO round in bitcoin miner Bitmain Bitmain cofounder Jihan Wu. Photo: Bloomberg Ardi Wirdana June 11, 2018 PremiumVenture capital firm Sequoia Capital China has reportedly led a $400 million pre-IPO round in local bitcoin miner and mining chip designer Bitmain Technologies Ltd, in a deal that valued the company at $12 billion. Continue reading this story with a subscription to DealStreetAsia. Subscribe Already a subscriber? Log in Should your colleagues be reading this article too? Contact us for corporate subscriptions at email@example.com.