An options chain is a table showing every available option contract for a given stock, organized by expiration date and strike price. Calls are on the left, puts are on the right, and strikes run down the middle. Once you can read this table, you can evaluate any options trade in seconds.

The Layout: What You're Looking At

An options chain for AAPL at $190 might look like this (simplified):

| Bid | Ask | Last | Vol | OI | Strike | Bid | Ask | Last | Vol | OI | 12.4012.6012.503,24145,1021802.152.252.201,89228,443 7.808.007.908,50272,3181853.453.553.504,21151,209 4.204.354.3012,10489,4411905.805.955.859,87665,331 1.851.951.906,78954,2211958.909.109.002,34132,118 | 0.65 | 0.72 | 0.68 | 4,102 | 41,008 | 200 | 12.30 | 12.50 | 12.40 | 987 | 19,445 |

Left side = Calls. Right side = Puts. Center column = Strike prices.

The strikes below the current price ($190) are ITM for calls and OTM for puts. The strikes above are OTM for calls and ITM for puts. Most platforms shade or highlight the ITM options.

Column-by-Column Breakdown

Bid: The highest price someone is willing to pay for the option right now. This is what you'll get if you sell at market.

Ask: The lowest price someone is willing to accept. This is what you'll pay if you buy at market.

Last: The price of the most recent trade. Can be misleading if the option is illiquid — the last trade might have been hours ago at a very different price.

Volume (Vol): The number of contracts traded today. High volume means the option is actively trading. Low volume means you might struggle to get a fair price.

Open Interest (OI): The total number of outstanding contracts. High OI indicates liquidity and active participation. OI updates once per day after the close.

How to Read the Bid-Ask Spread

The difference between bid and ask is the "spread." Tight spreads mean lower trading costs.

  • AAPL $190 call: $4.20 bid / $4.35 ask = $0.15 spread (tight, liquid)
  • Small-cap stock option: $1.00 bid / $1.50 ask = $0.50 spread (wide, costly)

    • Always try to get filled between the bid and ask with a limit order, not a market order. Start at the mid-price and adjust from there.

    Choosing an Expiration Date

    The chain shows multiple expiration dates — click through tabs or use a dropdown. Each expiration has its own chain.

    Weekly options: Expire every Friday. More expirations to choose from but often less liquid. Monthly options: Expire the third Friday of each month. Generally the most liquid. LEAPS: Expire a year or more out. Much higher premiums, less time decay.

    For income strategies, most traders focus on 30–45 day expirations. For directional bets, 45–90 days gives enough time without paying excessive premium.

    What to Look for in an Options Chain

    Liquidity check: High volume and tight bid-ask spreads. Avoid contracts with zero volume or $0.50+ spreads.

    Moneyness: Identify which strikes are ITM, ATM, and OTM. ATM options have the most extrinsic value.

    Premium comparison: Compare the bid price (for selling) across strikes to find the best risk/reward. OptionsPilot automates this by scanning chains across hundreds of stocks and ranking the best opportunities.

    Unusual activity: A sudden spike in volume relative to open interest (e.g., 10x the average) can signal institutional positioning.

    Pro Tips for Beginners

  • Use limit orders, never market orders, for options.
  • Look at delta in expanded chain views to gauge probability.
  • Compare multiple expiration dates — sometimes an extra week barely costs more but gives much better odds.
  • Start with SPY, QQQ, AAPL, or NVDA where bid-ask spreads are a penny or two.