Retail brokerage TD Ameritrade Holding Corp (AMTD.O) said on Friday it will allow clients to trade bitcoin futures on the newly minted CBOE Futures Exchange from Dec. 18. TD Ameritrade’s shares were up 2.4 percent in extended trading. Bitcoin prices BTC=BTSP hit a record high of $17,428 on Friday, amid warnings that it was a bubble on the verge of bursting. Cboe Global Markets Inc (CBOE.O) launched its bitcoin futures contract on Dec. 10, just over a week ahead of rival CME Group Inc (CME.O), as the exchange operator takes the next step toward launching an exchange-traded fund based on the digital currency. Bitcoin ... (full story)