Shares of Fitbit (NYSE: FIT) spiked higher in the early hours of trading on Tuesday, and the few outlets discussing the move are pinning the uptick on takeover speculation. Chatter earlier this month that Apple (NASDAQ: AAPL) was in talks with Aetna (NYSE: AET) to provide the insurer with free or low-cost Apple Watch to its roughly 23 million health insurance members -- a win-win idea, if it pans out -- is reportedly spawning speculation that rival insurers may want to acquire Fitbit whole for some serious skin in the wearables market.The rumor doesn't hold up.