What are Market Makers? Options dealers that provide liquidity to all the market participants and take the other side of client flows (trades). These traders try to hedge out as much of an option’s Greek exposures as possible (reduce or remove any directional risk) and their hedging may become a significant portion of daily trade volume in a stock, which may affect a stock’s direction and price. Related articles What is a Multiplier? What is Net Gamma? What is the Gamma Pinning Effect? What is the Rule of 16? What is Net Delta?