Cboe's move follows the closing announced today on its previously announced acquisition of European clearing house EuroCCP. Cboe last year agreed to pay about 36 million euros for the 80 percent of that Dutch clearing house it didn't already own. That clearing house currently clears, or essentially guarantees, trades on stocks, depository receipts and exchange-traded funds from 37 European venues, with about 35 billion euros in activity cleared daily, on average. It's now Cboe's only wholly owned clearing house. "Full ownership of a leading equities clearing house not only enhances our current European equities business,but also provides opportunities to diversify our business into trading and clearing derivatives in the region," Cboe CEO Ed Tilly said in the statement.