Read any option chain in 2 minutes: bid/ask, IV, volume, open interest. Step-by-step TSLA walkthrough with the strikes that actually matter.
The option chain is the single most important tool in options trading. Learning how to read an option chain quickly separates beginners from confident traders — yet most online guides skip the practical details. This step-by-step walkthrough uses real TSLA data to show you exactly what each column means.
The Option Chain Is Your Trading Dashboard
Think of a restaurant menu. It lists every dish, the price, maybe a description. You scan it, compare options, and pick the one that fits your appetite and budget. An option chain is exactly that — except instead of pasta and steak, you're browsing calls and puts at different strike prices and expirations.
If you understood the basics from our What Are Options article, you know the building blocks: strike price, premium, expiration, underlying. The option chain is where all those pieces come together in one place. It's the tool you'll use every single time you trade options.
And yeah — it looks intimidating the first time. Rows of numbers, cryptic column headers, colors everywhere. But here's the thing: you only need to understand about six columns to make smart trades. Let's break them down.
What Is an Option Chain?
An option chain (also called an "option matrix") is a table that lists all available options for a given stock, organized by expiration date and strike price. Every broker displays one, and they all show essentially the same data — just with slightly different layouts.
The chain is split into two sides: calls on the left, puts on the right (some brokers flip this or stack them). The strike prices run down the middle, and each row represents a different strike price. You pick an expiration at the top, and the chain shows you every available contract for that date.
Let's look at a live option chain for TSLA right now:
{{LIVE_DATA:chain:TSLA}}
Don't worry if all those numbers feel overwhelming — we're about to decode every single column.
Option Chain Columns Explained: Bid, Ask, Volume, IV
Most option chains show 10+ columns, but you really only need six to make informed decisions. Here's what each one means and why it matters to you as a trader.
Strike Price
The strike price is the center column — the price at which you'd buy (call) or sell (put) the underlying stock. Strikes are listed in order, usually in $1, $2.50, or $5 increments depending on the stock price. Higher-priced stocks like TSLA have wider strike intervals than cheaper stocks.
This is your anchor. Every other number in the row relates to this strike price.
Bid and Ask
The bid is the highest price someone is willing to pay for that option right now. The ask is the lowest price someone is willing to sell it for. If you're buying an option, you'll pay closer to the ask. If you're selling, you'll receive closer to the bid.
The difference between bid and ask is called the spread. A tight spread ($0.05–$0.20) means the option is liquid and you'll get a fair price. A wide spread ($1.00+) means you're paying a hidden tax just to enter and exit the trade.
Always use limit orders at the midpoint between bid and ask.
💡 Pro tip: Always use limit orders, never market orders. Set your limit at the midpoint between bid and ask. If the bid is $3.20 and ask is $3.40, start with a limit order at $3.30. You'll often get filled there or within a few cents.
Volume
Volume is the number of contracts traded today. High volume means the option is actively trading — there are lots of buyers and sellers, which means tighter spreads and better fills for you.
Low volume (under 10 contracts) is a red flag. You might struggle to get in at a fair price, and getting out could be even harder. Think of it like trying to sell a house in a ghost town — there just aren't enough buyers.
Open Interest (OI)
Open interest is the total number of outstanding contracts that haven't been closed or exercised. While volume resets to zero every day, open interest accumulates over time. High OI means many traders hold positions at that strike — it's a sign of established liquidity.
Here's the key difference: volume tells you what happened today. Open interest tells you the overall depth of the market at that strike. You want both to be healthy.
| Metric | What It Measures | Resets Daily? | What You Want |
|---|
| Volume | Contracts traded today | Yes | > 100 |
| Open Interest | Total outstanding contracts | No | > 500 |
Implied Volatility (IV)
The IV column shows the implied volatility for each specific contract. It tells you how "expensive" or "cheap" that option is relative to the stock's expected movement. Higher IV = more expensive premium. Lower IV = cheaper premium.
You'll notice IV varies across strikes — this is called the volatility skew. Typically, OTM puts have higher IV than OTM calls because demand for downside protection pushes up put prices. We dive deep into this in the Implied Volatility article.
For now, just know: if you're buying options, you generally want low IV. If you're selling, you want high IV. The chain lets you compare IV across strikes at a glance.
Delta (Optional but Powerful)
Some chains also show delta — the Greek that tells you how much the option price moves per $1 move in the stock. Delta also roughly approximates the probability that the option expires in the money.
A call with delta 0.30 means: the option price moves about $0.30 for every $1 stock move, and there's roughly a 30% chance it expires ITM. More on this in the Greeks article, but it's useful to have visible on your chain.
ITM, ATM, and OTM — Reading the Color Code
Most brokers highlight option chain rows with different colors or shading to show you which options are in the money (ITM), at the money (ATM), and out of the money (OTM). Understanding this visual language is crucial.
Moneyness: ITM options have intrinsic value, ATM are at the stock price, OTM have only time value.
For calls: any strike below the current stock price is ITM (the option already has intrinsic value). The strike closest to the stock price is ATM. Strikes above the stock price are OTM.
For puts: it's reversed. Strikes above the stock price are ITM. Strikes below are OTM.
| Call Option | Put Option | Characteristics |
|---|
| ITM | Strike < Stock Price | Strike > Stock Price | More expensive, higher delta, has intrinsic value |
| ATM | Strike ≈ Stock Price | Strike ≈ Stock Price | Highest time value, delta ~0.50, most liquid |
| OTM | Strike > Stock Price | Strike < Stock Price | Cheaper, lower delta, pure time value |
Here's something most beginners miss: ATM options are usually the most liquid. They have the highest volume, tightest spreads, and the most time value. When in doubt, start your analysis at the ATM strike and work outward.
A Step-by-Step TSLA Walkthrough
Let's put it all together with a practical walkthrough. Say you're bullish on TSLA and want to buy a call. Here's exactly how you'd navigate the option chain:
Step 1: Pick your expiration. You want 30–60 days to expiration (DTE) for most strategies. This gives you enough time for your thesis to play out without paying too much for time value. Look at the expiration tabs at the top of the chain and select one roughly 45 DTE.
Step 2: Find the ATM strike. Look at TSLA's current price and find the strike closest to it. This is your anchor point. Everything above is OTM (cheaper, less likely to pay off), everything below is ITM (more expensive, higher probability).
Step 3: Check liquidity. Look at the volume and open interest columns for the strikes you're considering. You want volume above 100 and OI above 500. If either is very low, move to a different strike or expiration — the trade costs of illiquid options will eat your profits.
Step 4: Check the spread. Calculate the bid-ask spread. Divide the spread by the midpoint price to get the spread as a percentage. Under 5% is great. 5–10% is acceptable. Over 10% — find a more liquid contract.
Step 5: Note the IV. Is IV high or low compared to the rest of the chain? If you're buying, lower IV at your chosen strike is better — you're paying less for the uncertainty premium.
Step 6: Calculate your cost. Take the ask price (what you'd pay) and multiply by 100. That's your total cost per contract. Make sure it fits your position sizing rules — never risk more than 1–5% of your account on a single trade.
A stylized option chain with the six key columns highlighted.
⚠️ Common mistake: Beginners often look at OTM options and think "it's only $0.50, that's cheap!" But cheap in dollars doesn't mean cheap in value. A $0.50 OTM option might have a 10% chance of profiting. A $5.00 ATM option might have a 50% chance. The ATM option is actually the better deal in terms of expected value.
Option Chain Liquidity Checklist
Before you trade any option, run it through this quick liquidity filter. It takes 10 seconds and saves you from costly illiquid traps:
| Filter | Minimum | Ideal | Why It Matters |
|---|
| Bid-Ask Spread | < $0.30 | < $0.10 | Tight spread = lower trading cost |
| Volume | > 50 | > 500 | Active trading = fair prices |
| Open Interest | > 200 | > 1,000 | Deep market = easy exits |
| Spread % | < 10% | < 3% | Relative cost of entry/exit |
If a contract fails two or more of these filters, skip it. There's always a more liquid strike or expiration nearby. In my experience, the number one silent killer for new options traders isn't picking the wrong direction — it's trading illiquid options where the bid-ask spread eats them alive on entry and exit.
How to Pick the Right Strike
This is the million-dollar question. The "right" strike depends on your strategy, but here are practical guidelines for the most common scenarios:
If You're Buying Calls or Puts (Directional Bet)
Go ATM or slightly ITM (delta 0.50–0.70). Yes, they cost more. But they have a higher probability of profit, move more with the stock, and don't decay as aggressively. OTM options are lottery tickets — occasionally they pay off big, but most of the time they expire worthless.
If You're Selling Covered Calls
Go OTM (delta 0.20–0.30). You want the option to expire worthless so you keep the premium and your shares. Picking a strike above your cost basis plus the premium gives you a nice outcome even if assigned.
If You're Selling Puts (Cash-Secured)
Go OTM (delta 0.20–0.30). Pick a strike at a price where you'd happily buy the stock. The premium you collect makes your effective purchase price even lower.
If You're Trading Spreads
The width between your strikes defines your risk. Narrower spreads cost less but cap your profit. Wider spreads cost more but offer better risk-reward. We cover this in detail in the Bull Call Spread and Bull Put Spread articles.
Pro Tips for Reading Option Chains
After hundreds of trades, here are the shortcuts I wish someone had told me on day one:
Stick to high-volume underlyings. SPY, QQQ, AAPL, TSLA, NVDA, AMZN, META, MSFT — these have the tightest spreads and deepest liquidity across all strikes and expirations. When you're learning, there's no reason to trade options on a small-cap stock with $2.00 wide spreads.
Use the midpoint, not the last price. The "last" price on a chain is the price of the most recent trade, which could have been hours ago. The midpoint between bid and ask is a much more accurate representation of the option's current value.
Watch for unusual volume. If a contract normally trades 200 contracts a day and suddenly has 5,000 — something's happening. Big institutional players might know something. Unusual volume at a specific strike can signal upcoming catalysts or large hedging activity.
Compare IV across strikes. If the 10% OTM put has IV of 45% but the ATM call has IV of 32%, puts are relatively expensive. This matters when you're deciding whether to buy or sell premium at different points on the chain.
Check multiple expirations. Sometimes the option you want is illiquid at one expiration but perfectly liquid a week later. Monthly expirations (third Friday) tend to be the most liquid. Weeklies can have wider spreads, especially on lower-volume stocks.
Your Next Steps
1. Open a real option chain. Log into your broker (or use a free tool like Yahoo Finance or CBOE) and pull up the TSLA option chain. Find the 45 DTE expiration and identify the ATM strike. Check the bid-ask spread, volume, and OI. Get comfortable navigating.
2. Practice the liquidity filter. Pick five different strikes across the chain and run each through the liquidity checklist above. How many pass all four filters? You'll quickly see that liquidity concentrates around ATM strikes.
3. Learn the Greeks. Now that you can read the chain, you need to understand what moves those numbers. Head to our next article: Option Greeks — Delta, Gamma, Theta, Vega. The Greeks explain why option prices change — and that's the key to picking the right trades.
📚 Up next: Option Greeks — Delta, Gamma, Theta, Vega, Rho →