Friday's selloff in the stock market resulted in the biggest options volume day ever and the latest sign of the retail trading crowd's incredible support of the stock market. Scott Rubner, head of equity and equity derivatives strategy at Citadel Securities, said Friday, Oct. 10 resulted in over 108 million contracts traded, only the second time its topped 100 million ever. The interest was driven by retail traders and they had a distinct bullish bias. "Retail's bullish conviction remains extraordinary," Rubner wrote. Retail flow skewed 11% better to buy through the firm's call/put direction ratio, topping the 4% average over the last three months, and marking the largest single-day call buying on the platform, according to the note. It was the 24th straight week with a "better-to-buy" opt

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