Margin Trading

okcoin
OKCoin Targets International Markets with Margin Trading Launch
OKCoin is reintroducing its peer-to-peer margin trading service by opening the platform to foreign users.
okcoin

BTC.sx
BTC.sx revives bitcoin margin trades
A new trading platform, BTC.sx, is offering investors the chance to take short and long positions on future bitcoin price movements against the dollar.
BTC.sx