Vistra Energy call volume above normal and directionally bullish

Bullish option flow detected in Vistra Energy with 19,158 calls trading, 4x expected, and implied vol increasing over 6 points to 53.82%. 6/7 weekly 106 calls and Jan-25 140 calls are the most active options, with total volume in those strikes near 11,300 contracts. The Put/Call Ratio is 0.66. Earnings are expected on August 8th.