Trading term
What is Option chain?
An option chain is the table brokers display of all the options available on a stock — every strike and expiration, with calls on one side and puts on the other, showing prices (bid/ask), volume, and open interest. It's the menu options traders read to choose a contract.
An option chain lays out the full grid of contracts for a stock. Rows are strike prices; expirations are selected separately. Traditionally calls are shown on the left and puts on the right, with the strikes running down the middle. For each contract you see the bid and ask (what you can sell or buy at), the last price, the day's volume, open interest (how many contracts exist), and often the implied volatility and Greeks. The at-the-money strikes sit in the middle, with in-the-money and out-of-the-money contracts above and below.
Reading a chain is the first practical skill in options. It tells you what's liquid (tight bid-ask spreads, high volume and open interest) versus what's thinly traded and risky to enter. It shows how premiums change across strikes and expirations, making the trade-offs — cost versus probability, near-term versus longer-dated — visible at a glance. Traders scan the chain to pick a strike and expiry that match their view, budget, and the liquidity they need to get in and out cleanly.
Calls on the left, puts on the right, strikes down the middle — each with a bid and ask. A tight bid-ask gap marks a liquid strike; the at-the-money row (here $52) is the reference point.
For example
On a chain for a $52 stock, the $50 call shows a $2.60 bid / $2.75 ask with 3,000 open interest (liquid, tight spread), while a far $70 call shows $0.05 / $0.15 with almost no open interest — technically available, but too thin to trade cleanly.
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That's Option chain in theory — it clicks when you read it on a live chart. Practise it hands-on in the TradeWize Premium Options track.
Explore Premium →Why it matters to you
The option chain is the cockpit of options trading — every decision about strike, expiry, cost and liquidity is made by reading it. Learning to scan a chain for tight spreads and high open interest is what keeps a trader out of illiquid contracts that are cheap to enter but painful to exit.
⚠ A quote isn't the same as liquidity
Every strike shows a price, which makes far out-of-the-money options look tradeable. But a listed quote with a wide bid-ask spread and near-zero open interest means you'll lose a chunk just entering and exiting. Trading illiquid strikes off the chain — lured by a low premium — is a common, costly beginner mistake.