Open Interest for Covered Calls: How to Select Better Strikes

Learn how open interest helps covered call strike selection. Compare OI, volume, delta, premium, liquidity, and risk to choose better call strikes.

Choosing a covered call strike isn't just about picking the option with the highest premium. If you own 100 shares of a stock and want to sell a call against those shares, the strike you choose affects how much premium you gather, how much upside you keep, and the price at which your shares could be called away. This is where open interest for covered calls comes in handy. Open interest shows you how many option contracts are still outstanding at a specific strike and expiration, which helps you see where market activity is happening in the options chain. The Options Clearing Corporation states that open interest indicates outstanding option contracts, while volume refers to contracts traded during a certain period. However, every covered call trader should know an important point: high open interest doesn't automatically mean a strike is the best one to sell. A strike can have significant open interest but still have a poor bid-ask spread, low premium, an unsuitable delta, or not enough upside for your investment goals. Think of open interest as just one road sign rather than the complete map. A better way to select a covered call strike combines open interest with volume, spread, delta, implied volatility, days to expiration, premium, expected return, assignment considerations, stock price, and upcoming events. The goal is not to find one perfect number. It’s to identify a strike that matches your objectives with the stock. What Is Open Interest in Options? Open interest , usually called OI, refers to the number of outstanding option contracts that remain open for a specific option series. An option series is defined by the underlying security, expiration date, strike price, and contract type. For instance, the 105 call expiring on a specific Friday has its own open-interest figure, separate from the 110 call or any call with a different expiration. The OCC keeps and reports open-interest data for listed options. For a covered call trader, this is important because an options chain may include dozens or even hundreds of possible combinations. Open interest provides additional information when comparing those choices. A strike with 15,000 contracts of open interest has a very different history of outstanding positions than one with only 30 contracts. However, OI does not indicate whether those contracts are long calls, short calls, hedges, spreads, or other positions. Every open option contract has both a buyer and a seller, so interpreting OI as simply "bullish" or "bearish" can be misleading. This is especially significant when looking at call option open interest. A large call OI number does not automatically mean that traders expect the stock to fall. It only shows that many contracts remain outstanding. For covered call strike selection , the more relevant question is: "Does this strike have enough market participation and acceptable execution characteristics for the trade I want to make?" How Open Interest Is Created Open interest changes