An options chain lists every contract available on one stock, grouped by expiry and strike, calls on one side and puts on the other. The columns that matter are strike, bid and ask, delta and open interest. Everything else is detail you can ignore until you have a reason not to.
The shape of the screen
First you pick an expiry date — usually a dropdown or a row of dates. That filters everything below it. Then you are looking at a list of strike prices running from low to high, with the current share price sitting somewhere in the middle.
Calls are conventionally on the left, puts on the right, strikes down the centre. Above the current price, calls are out of the money and puts are in the money. Below it, the reverse. If you only remember one thing about the layout: the middle of the screen is roughly where the stock is trading now.
The columns that matter
| Column | What it is | What to do with it |
|---|---|---|
| Strike | The price the contract lets you buy or sell at | Pick it from your thesis, not from the price of the contract. |
| Bid / Ask | What you can sell at / what you must pay | You pay the ask. A wide gap is a real cost before the trade even starts. |
| Delta | Movement per $1 of the underlying, and a rough probability | 0.30 delta means roughly a 30% chance of finishing in the money. |
| Open interest | Contracts currently held open at that strike | Your liquidity check. Low open interest means a bad spread and a hard exit. |
| Volume | Contracts traded today | Activity today, versus open interest's total. Useful as a sanity check. |
| IV | Implied volatility — the move the market expects | High IV means expensive. Compare it across expiries, not in isolation. |
Comparing two contracts
The instinct is to compare premiums and pick the cheaper one. That is comparing the wrong number. Two contracts on the same stock differ in what they need to happen, and the premium is the market pricing that difference.
Work through it in this order
- What has to happen, and by when? Pick the expiry from your thesis. If you think the move takes six weeks, a two-week contract is a different bet from the one you meant to make.
- What is the break-even? Strike plus premium for a call. Ask whether you actually believe the stock gets there.
- Can I get out? Check open interest and the spread before anything else about the price.
- What does waiting cost? Theta, per day. Multiply it by how long you expect to hold.
- Am I buying expensive expectations? If IV is elevated because of an event, the event happening may not be enough.
Two traps the chain sets
The cheapest row on the screen
Far out-of-the-money contracts a few days from expiry cost very little and are the single most common way beginners lose the whole position. They are priced that way because the market has judged them very unlikely. Cheap is the market's opinion, not a discount.
The chain the day before earnings
Implied volatility is at its highest, so every contract is at its most expensive. Buying then means the stock has to beat not just its current price but the move already priced in — and the moment earnings pass, IV collapses and takes value out of the contract even if you were right.
Reading one for real
None of this lands until you are looking at an actual chain. Stock Picks shows full chains with delta, theta and implied volatility on every strike, and a payoff diagram that draws the break-even for you before you commit — with no money at risk. Open one, pick two contracts on the same stock, and work out why one costs four times the other.
Common questions
What is an options chain?
An options chain is the list of every available contract for one stock, organised by expiry date and strike price, with calls usually on one side and puts on the other. It is the menu of everything you could trade on that stock.
Which columns actually matter?
Strike, bid, ask, delta and open interest, roughly in that order. Volume and implied volatility matter once you are comparing contracts. Most of the rest of the screen is detail you can ignore until you have a reason not to.
What is open interest and why does it matter?
Open interest is the number of contracts currently held open at that strike. It is the best quick proxy for liquidity — a strike with open interest in the thousands will be easy to get in and out of, one with single digits will have a punishing spread.
What does implied volatility tell me?
How big a move the market is pricing in. High implied volatility means expensive contracts, because the market expects movement. It is why buying calls just before earnings often disappoints: you pay for the expected move, and then it happens.
Should I look at the bid, the ask, or the midpoint?
You buy at the ask and sell at the bid. The midpoint is a useful reference and an optimistic assumption. On a wide spread, the difference between the midpoint and the ask can be a meaningful fraction of the whole trade.
Why are some strikes much cheaper than others?
Because the market thinks they are less likely to pay out. A cheap contract is cheap for a reason — it is far from the current price, or close to expiry, or both. Price is the market's estimate of the odds.
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Stock Picks is an educational trading simulator published by Realtime Software Inc.. Nothing on this page is investment advice, a recommendation, or an offer to buy or sell any security. Trades placed in the app are simulated against live market prices — no securities change hands and no real money is at risk in the app. Simulated results predict nothing about real markets. Options involve risk and are not suitable for every investor. See our disclosures.