However, unlike a stock where a market maker could buy 100 shares on their Bid, and sell that 100 shares on their Ask and have no positions, market makers in options often don't have the luxury of seamlessly matching positions on their books and eliminating risk. In addition, with so many individual options contracts to make markets on, what is shown on the Bid/Ask may not necessarily be the only price at which a market maker is willing to trade. They may be willing to buy or sell inside the Bid/Ask based on calculation of 'edge' they could receive for making that trade. That edge calculation is based on the option order's price versus the market maker's calculation of 'fair value' for that contract. (Put simply, if the market maker has an option priced at 1.05 fair value, filling an order with a 1.15 limit bid would give them 10c of edge).