Read this FAQ on trade entry and execution to learn more about the factors that can affect your options. You'll learn about what can be used to set a stop-loss order, how a bid-ask width is set, how open interest affects orders, and entry during market volatility. When you have read through the options trading basics, complete the Firstrade online application to open your account today!
It is unlikely that open interest will affect executions as much as the bid or ask side does. Open interest is simply the number of outstanding contracts. It expands and contracts as investors and traders open and close positions. If you enter a market sell order, you will be filled at the best available bid price. If the quantity at that bid price is less than your order size, then you'll sell the number of contracts on that bid and the balance of your order at the next-best bid price, and so on.
If you believe the market would have problems digesting a certain quantity of contracts, it might be appropriate to spread that quantity out over the course of the trading day. If you're worried about the price you will receive upon entering a market order, consider using a limit order, where the limit is the lowest price you will accept.