Kyle Janas June 9, 2019 Trader Tips, Options Education Bid Size and Ask Size on Option Contracts - How You Can Use It To Your Advantage Kyle Janas June 9, 2019 Trader Tips, Options Education When bid size is radically different from the ask size, it can represent a supply and demand imbalance. Bid size and ask size can help traders gauge where to place orders and in turn, get quicker fills.