How do you read an option chain?

Calls are on the left, puts on the right, and strike prices run down the middle. Each row shows the bid (selling price), ask (buying price), volume, and open interest. Always use limit orders at the mid price between bid and ask.

What is the bid-ask spread in options?

The spread is the gap between the bid and the ask price. It is a silent cost on every trade. If the bid is $2.80 and the ask is $3.20, the spread is $0.40. Tighter spreads mean lower trading costs.

How to Read an Option Chain — A Beginner's Guide

Last time: You learned the three zones — ITM, ATM, OTM — and how moneyness shifts as the stock moves. Now let's see everything in one place.

You walk into a restaurant for the first time. The menu is twelve pages long. Multiple sections, abbreviations you have never seen, prices that seem random. Your instinct is to panic, point at something, and hope for the best.

That is exactly how most beginners feel the first time they open an option chain.

But once someone tells you that page one is appetizers, page two is mains, and those abbreviations are just portion sizes, you realize you have been looking at a perfectly organized menu the whole time.

The Cockpit, Decoded

Remember the cockpit from lesson two? The screen that looked like it was designed by someone who genuinely did not want you to understand it?

This is that screen. And you are about to understand every number on it.

The Layout

Calls on the left. Puts on the right. Strike prices down the middle.

That is the entire layout. Two sides of a mirror. Calls for people who think the stock is going up. Puts for people who think it is going down. Strikes run from low to high, top to bottom.

At the top, tabs for different expiration dates. Click a tab, the whole chain updates.

The Columns

Bid is the highest price someone is willing to pay right now. If you want to sell, this is what you get.

Ask is the lowest price someone is willing to sell for. If you want to buy, this is what you pay.

Last is the most recent trade price. Useful context, but not always reliable if the contract has not traded recently.

Volume is how many contracts traded today. Higher means more activity.

Open Interest is how many contracts currently exist. Higher means more liquidity, tighter spreads, easier fills.

The Bid-Ask Spread

The gap between bid and ask is the spread. It is a silent cost on every trade.

Bid $2.80, ask $3.20. Spread is $0.40. The moment you buy at $3.20, you could only sell for $2.80. You are down $40 per contract before the stock moves.

Apple and SPY options have tight spreads, maybe $0.05 to $0.10. Less popular stocks can have spreads of $0.50 or more. If the spread is more than 10% of the option's price, think twice.

Reading a Real Chain

Apple at $100, January expiration. Call side:

$95 call: Bid $6.30, Ask $6.50. Volume 3,200. Open Interest 18,000.

$100 call: Bid $2.80, Ask $3.00. Volume 5,800. Open Interest 25,000.

$105 call: Bid $0.90, Ask $1.10. Volume 1,500. Open Interest 11,000.

There is our tracking trade. The $105 call. Spread of $0.20. Decent liquidity.

How to Scan Like a Pro

Step one: Pick your expiration tab. 30 to 60 days.

Step two: Find the ATM strike. The one closest to the current stock price. This is your anchor.

Step three: Check liquidity. Volume and open interest should be high. Spread should be tight.

Step four: Compare 2-3 strikes. ATM, one above, one below. Pick the one that matches your outlook.

Step five: Use a limit order at the mid price. Bid $2.80, ask $3.00, enter your order at $2.90. Never use a market order on options.

First time I opened an option chain, I accidentally bought a put when I meant to buy a call. Calls on the left, puts on the right. I was looking at the right side and thought it was the call side. Closed it ten minutes later for a $40 loss and a lesson I have never forgotten. Left side, calls. Right side, puts.

Start With SPY

If you want to practice reading chains without pressure, start with SPY. It is the most traded option chain in the world. Tightest spreads you will ever see, enormous volume. Pull it up, click around, get comfortable.

Key Takeaways

Calls on the left, puts on the right, strikes down the middle
Bid = what you get selling. Ask = what you pay buying. The spread is your silent cost.
Always use limit orders at the mid price — never market orders on options
Check volume and open interest for liquidity before trading any contract

Pop Quiz — Let's see if this stuck.

Bid $2.80, Ask $3.20. You want to buy. What price do you set your limit order at?

$3.00 — the mid price. Halfway between bid and ask. This gives you a fair fill without overpaying.

A contract has open interest of 12 and a spread of $1.50. Should you trade it?

No. Low open interest (12) means poor liquidity, and a $1.50 spread is very wide. You would overpay entering and lose money exiting. Find a more liquid contract.

Bottom Line

The option chain is a menu. Calls on the left, puts on the right, strikes down the middle. The bid is what buyers will pay, the ask is what sellers want, and the spread between them is your silent cost. Volume and open interest tell you how liquid a contract is. Always use limit orders at the mid price. Start with SPY to practice. Once you can read the chain, every concept from the last four lessons has a home.

Next up: Intrinsic vs. Extrinsic Value →

You can read the menu now. Next, we go deeper into what the price is actually made of. Two ingredients, and the mix changes everything.