A partial fill occurs when an order to buy or sell a financial instrument is only partially executed. This situation typically arises in markets with varying liquidity levels, where the available quantity at the desired price may not match the total order size. For instance, if a trader places an order to purchase 1,000 shares of a stock, but only 600 shares can be bought at the specified price, the remaining 400 shares remain unfilled. Partial fills can have implications for trade execution and strategy, as traders may need to manage the unfilled portion differently.
