Hi, I see a lot of post talking about how a large amount of options for a stock is bought / sold on a particular day. This is a newb question, but how can you tell if the options were bought as opposed to sold? I mean, wouldnt there have to be a seller for every buyer? For stocks, I suppose you could tell based on whether the orders went off at the bid or ask. Is that the same thing for options? And is there a place where this information can be found? Thanks in advance.