Honestly, no-one knows, except maybe Citadel and brokers who run via 'payment for order flow' There have been estimates using subscriber counts on subreddits a

Honestly, no-one knows, except maybe Citadel and brokers who run via 'payment for order flow' There have been estimates using subscriber counts on subreddits and an average value which feels like complete BS, and there are some brokers who broadcast how many they own. However, institutional ownership for the top 10 is 192% http://finra-markets.morningstar.com/MarketData/EquityOptions/detail.jsp?query=126%3A0P000002CH&sdkVersion=2.59.0 http://finra-markets.morningstar.com/MarketData/EquityOption... Even Finra don't seem to know properly, the sums don't add up.