Options Chain Explained: How to Read One Like a Pro

The options chain is a table that displays all available options contracts for a given stock, organized by expiration date and strike price. It's the primary tool you use to select, analyze, and compare options before placing a trade.

Every brokerage platform displays the chain slightly differently, but the core information is the same.

The Layout

A standard options chain is split into two halves:

  • Left side: Call options
  • Right side: Put options
  • Center column: Strike prices

    • Across the top, you'll see tabs or a dropdown for selecting the expiration date. Each expiration shows its own chain of available strikes.

    Strike prices run vertically from lowest at the top to highest at the bottom (or vice versa depending on the platform). The current stock price falls somewhere in the middle, separating ITM from OTM strikes.

    Key Columns Explained

    Bid and Ask

    The bid is the highest price someone is currently willing to pay. The ask is the lowest price someone is willing to accept. You buy at or near the ask and sell at or near the bid.

    The mid-price (average of bid and ask) represents the approximate fair value. Always check the spread width—a $0.10 spread is tight, a $1.00 spread is wide.

    Last Price

    The most recent trade price. This can be stale and misleading if the option hasn't traded in hours. Always reference the bid/ask for current pricing rather than the last trade.

    Volume

    The number of contracts traded today. High volume indicates active trading interest at that strike. A sudden spike in volume can signal new positioning by institutional traders.

    Open Interest

    The total number of outstanding contracts at that strike and expiration. High OI means established positions and typically better liquidity. Updated once daily after market close.

    Implied Volatility (IV)

    The market's forecast of future volatility baked into the option's price. Higher IV = more expensive options. Compare IV across strikes and expirations to find relative value.

    The Greeks

    Most chains display the key Greeks:

  • Delta: Directional sensitivity. Ranges from 0 to 1.00 for calls, 0 to -1.00 for puts.
  • Gamma: Rate of delta change. Highest for ATM options near expiration.
  • Theta: Daily time decay. Negative for buyers, positive for sellers.
  • Vega: Sensitivity to IV changes. Higher for longer-dated options.

    • How to Navigate the Chain

    Step 1: Select the Expiration

    Start by choosing your target expiration. The chain shows one expiration at a time (or all expirations if you expand the view). Pick the timeframe that matches your trade thesis.

    Step 2: Identify the ATM Strike

    Find the strike price closest to the current stock price. This is your reference point. Strikes above the stock price are OTM for calls and ITM for puts. Strikes below are ITM for calls and OTM for puts.

    Many platforms shade ITM options in a different color (often light blue or yellow) to help you quickly distinguish them from OTM options.

    Step 3: Compare Strikes

    For a long call or put: Compare the delta, premium, and bid-ask spread across 3-4 strikes around your target. You're balancing cost against probability.

    For selling premium (covered calls, CSPs): Look at OTM strikes with delta between 0.15 and 0.30. Compare the premium you'd collect against the probability of being assigned.

    Step 4: Check Liquidity

    Before committing to a strike, verify:

  • Open interest > 500 (ideally > 1,000)
  • Bid-ask spread < 10% of the option's price
  • Today's volume > 50 contracts

    • If any of these are weak, consider a different strike or expiration with better liquidity.

    Reading the Chain for Specific Strategies

    Covered Call Writers

    Look at OTM call strikes (right side of center). You want:

  • A strike above your cost basis (or above the current price if you don't mind selling)
  • Premium that provides an acceptable return for the holding period
  • Delta of 0.20-0.35 for a balance of premium and probability of keeping shares

    • Cash-Secured Put Sellers

    Look at OTM put strikes (right side, below current price). You want:

  • A strike at a price you'd happily buy the stock
  • Enough premium to justify tying up the cash collateral
  • Delta of 0.20-0.30 for reasonable probability of expiring worthless

    • Spread Traders

    Compare the premium difference between two strikes. For a bull call spread, you're buying a lower strike call and selling a higher strike call. The chain lets you quickly see the net debit (or credit) for any combination.

    Practical Tips

    Customize your chain. Most platforms let you add or remove columns. Add the Greeks and IV if they aren't shown by default. Remove columns you don't use to reduce visual clutter.

    Use the chain as a screener. Scan across expirations to find where the premium, delta, and liquidity best match your criteria. OptionsPilot's strike finder automates this process for covered calls and cash-secured puts, but knowing how to read the raw chain makes you a more informed trader.

    Save common views. If you frequently trade monthly ATM options, set that as your default chain view to save time.