How To Read An Options Chain
A step-by-step walkthrough of every column in an options chain — so you can pick the right contract with confidence.
Updated October 7, 2026 · 4 min read
In Short
An options chain (also called an options table) is a grid showing every available call and put contract for a specific stock, organised by expiration date and strike price. It's the interface you use to find and buy options.
On This Page
What Is An Options Chain?
Most chains display calls on the left and puts on the right (or in separate tabs), with strike prices running down the middle. The current stock price sits roughly in the middle of the strike list.
The Columns — What Each One Means
| Column | What it shows | What to look for |
|---|---|---|
| Strike | The fixed buy/sell price of the contract | Strikes near the current stock price (ATM) are most responsive |
| Bid | The highest price a buyer will pay right now | If you sell, you'll receive close to the bid |
| Ask | The lowest price a seller will accept right now | If you buy, you'll pay close to the ask |
| Last | Price of the most recent trade | Can be stale — always use bid/ask for real pricing |
| Volume | Number of contracts traded today | Higher volume = more liquid, easier to exit |
| Open Interest (OI) | Total outstanding open contracts | High OI = liquid, tight spreads. Low OI = risky to trade |
| IV % (Implied Volatility) | The market's expectation of future price movement | High IV = expensive premiums; low IV = cheaper options |
Understanding The Bid-Ask Spread
The spread is the difference between the bid and the ask. A contract with a bid of $2.00 and an ask of $2.10 has a $0.10 spread. When you buy at the ask and immediately sell at the bid, you lose that spread.
Choosing An Expiration Date
Expiration dates are listed at the top of the chain. Common choices:
| Time to expiry | Best for | Risk level |
|---|---|---|
| 0–7 days (0DTE/weekly) | Very short-term plays, experienced traders only | Very high — theta decay is rapid |
| 2–5 weeks | Swing trades and earnings plays | Medium — good balance of cost vs time |
| 1–3 months | Beginners, directional bets with more time | Lower — more time for the trade to work |
| 6–24 months (LEAPS) | Long-term bullish bets, stock replacement | Lowest time pressure |
Beginners should avoid options expiring in less than 2 weeks — time decay accelerates sharply near expiration and can wipe out gains from a correct directional call.
The Greeks — A Simple Overview
Options prices are driven by several sensitivity measures called "the Greeks". You don't need to master all of them to start trading, but knowing the two most important will sharpen your decision-making:
Delta (Δ)
Delta tells you how much an option's price moves for every $1 move in the stock. A call with delta 0.50 gains ~$0.50 per share (or $50 per contract) for every $1 rise in the stock price.
- Calls: delta between 0 and +1
- Puts: delta between -1 and 0
- ATM options: delta ~0.50; deep ITM ~0.80-1.00; deep OTM ~0.10
Theta (Θ) — Time Decay
Theta is how much value an option loses each day just from the passage of time. A theta of -0.05 means the option loses $0.05 per share ($5 per contract) per day. Theta works against buyers of options and accelerates sharply in the last 30 days before expiry.
How To Identify A Good Options Trade In The Chain
- Find the expiration that gives your thesis enough time to play out (at least 2-4 weeks for beginners)
- Look at strikes near the current price — ATM or slightly OTM calls/puts
- Check volume and open interest — both should be at least in the hundreds
- Check the bid-ask spread — keep it tight
- Check IV — if IV is unusually high (e.g. into earnings), premiums are inflated
Keep Learning
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Frequently Asked Questions
What is an options chain?
An options chain (also called an options table) lists all available call and put contracts for a stock, organised by expiration date and strike price. It shows the current bid, ask, last price, volume, and open interest for each contract.
What does open interest mean in options?
Open interest is the total number of outstanding options contracts that have not yet been settled or closed. High open interest at a strike price indicates it is actively traded and liquid — meaning you can enter and exit positions more easily.
What is delta in options?
Delta measures how much an option's price changes for every $1 move in the underlying stock. A call with delta 0.50 gains roughly $0.50 (per share, or $50 per contract) for every $1 rise in the stock price. Delta ranges from 0 to 1 for calls and -1 to 0 for puts.
What is theta decay in options?
Theta measures how much an option loses in value each day due to the passage of time — this is called time decay. All else equal, an option loses value every day it approaches expiration. Theta decay accelerates in the final 30 days before expiry.
How do I choose the right strike price for an option?
For beginners, at-the-money (ATM) options — where the strike is closest to the current stock price — offer a balance between cost and responsiveness. In-the-money (ITM) options cost more but move more predictably. Out-of-the-money (OTM) options are cheaper but expire worthless more often.