Twitter (TWTR) calls active as shares rally 5%

Twitter (NYSE: TWTR) August weekly 17 and 17.5 calls are active on total call volume of 71K contracts (15K puts) on renewed takeover chatter. August weekly call option implied volatility is at 47, August is at 55, August is at 45, September is at 47; compared to its 52-week range of 40 to 118.

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