Many have connected the increased option activity with the “spot-up, vol-up” phenomenon in late August, as well as with the ferocity of the market sell-off. The logic goes something like this: dealers who write (i.e. “sell”) the call option are exposed to the underlying price change, so to hedge this “delta,” they buy stocks on the way up. It was assumed that it was retail flows, from the “Robinhood crowd,” that were forcing the market up by buying these call options in droves.
However, on Friday, the FT dropped “the bombshell”: Softbank had been buying billions of dollars worth of calls. Case closed, right?
Well, not so fast. This chart from SentimenTrader (by way of Benn Eifert) suggests otherwise, showing that $40 billion of these option orders over the past month have come in order sizes of 50 contracts or fewer.