Option Chains

An option chain is a table that displays all available options contracts for a given stock, organized by expiration date and strike price. It shows calls on one side and puts on the other, with each row representing a different strike price. The chain is the primary tool for selecting and analyzing options trades.

Why It Matters

The option chain is where you go to find, compare, and select contracts. Every trade you make begins with reading the chain. Understanding how to navigate it efficiently — filtering by expiration, scanning strike prices, comparing premiums and Greeks — is a non-negotiable skill for options traders.

The chain also gives you a real-time snapshot of market sentiment. By looking at where volume and open interest cluster, you can see which strikes and expirations the market is focused on. Heavy put activity at a certain strike? The market may be hedging or betting on a downside move.

How It Works

A standard option chain displays these columns for each strike:

• Bid — The highest price someone is willing to pay for the contract
• Ask — The lowest price someone is willing to sell the contract for
• Last — The most recent trade price
• Volume — Contracts traded today
• Open Interest — Total outstanding contracts
• Implied Volatility — The market's expected volatility priced into this contract
• Greeks — Delta, gamma, theta, vega (may need to be enabled)

The chain is split by expiration date. You select the expiration you want, then see all available strikes. Most platforms shade or highlight ITM options to visually separate them from OTM options.

Reading the layout:

• Calls are typically on the left, puts on the right
• The strike price column runs down the center
• ITM calls are at the top (lower strikes), OTM calls at the bottom (higher strikes)
• ITM puts are at the bottom (higher strikes), OTM puts at the top (lower strikes)

Tips for reading chains efficiently:

1. Start by selecting your target expiration
2. Find the ATM strike (closest to current stock price)
3. Compare bid-ask spreads across strikes — wide spreads mean poor liquidity
4. Check open interest to confirm the contract is actively traded
5. Look at implied volatility to gauge whether options are expensive or cheap

Quick Example

You pull up the option chain for MSFT trading at $380. You select the monthly expiration 30 days out. The chain shows strikes from $350 to $410 in $5 increments. The $380 call (ATM) shows bid: $7.80, ask: $8.00, volume: 12,000, OI: 45,000, delta: 0.52. The $390 call (OTM) shows bid: $3.40, ask: $3.55, volume: 8,000, OI: 30,000, delta: 0.30. The tight spreads and high volume tell you both contracts are liquid and executable.