Tesla Motors, Inc. (TSLA) Bulls Rev Their Engines

As electric-car battery maker A123 Systems throws shade at Apple Inc. (NASDAQ:AAPL), the shares of Tesla Motors Inc (NASDAQ:TSLA) are up 2.5% at $209.62. What's more, options traders are rolling the dice on more upside for TSLA through tomorrow's close, with calls crossing the tape at an accelerated clip.

February-dated options -- which expire tomorrow night -- account for the 10 most active TSLA contracts today. It looks like speculators are buying to open the February 207.50 and 210 calls, amid expectations for TSLA to extend today's upward momentum tomorrow. The stock peaked at $210.97 in intraday action.

Today's appetite for calls suggests Tesla Motors Inc (NASDAQ:TSLA) options buyers could be shifting gears. On the International Securities Exchange (ISE), Chicago Board Options Exchange (CBOE), and NASDAQ OMX PHLX (PHLX), the stock's 10-day put/call volume ratio of 1.13 stands higher than 90% of all other readings from the past year. In other words, TSLA traders have bought to open puts over calls at a much faster-than-usual pace during the past two weeks.