How Options Work Step by Step

Understanding the mechanics of options trading is crucial before you start. Let's walk through exactly how options work from start to finish.

Step 1: Understanding the Contract

Every option contract has four key components:

Underlying Stock - The stock the option is based on (e.g., AAPL)
Strike Price - The price at which you can buy/sell (e.g., $175)
Expiration Date - When the contract ends (e.g., March 15, 2025)
Option Type - Call (right to buy) or Put (right to sell)

Example: An "AAPL March 15 $175 Call" means:

Stock: Apple
Expires: March 15
Strike: $175
Type: Call (right to buy)

Step 2: The Premium

When you buy or sell an option, the price is called the premium. This is quoted on a per-share basis, but remember - each contract controls 100 shares.

Premium Quote	Actual Cost/Credit
$2.50	$250 (100 × $2.50)
$1.75	$175
$0.50	$50

For Buyers: Premium is your maximum risk - you can't lose more than you paid.

For Sellers: Premium is your maximum profit - you keep it if the option expires worthless.

Step 3: Opening a Position

Buying to Open (Long Position)

Pay the premium
Gain the right to exercise
Profit if option value increases

Selling to Open (Short Position)

Receive the premium
Take on an obligation
Profit if option value decreases (or stays flat)

Step 4: What Happens During the Life of the Option

Once you have a position, several things can happen:

Time Decay (Theta)

Every day, options lose some value
This accelerates as expiration approaches
Good for sellers, bad for buyers

Price Movement

Stock moves affect option value
Calls gain value when stock rises
Puts gain value when stock falls

Volatility Changes

Higher volatility = higher option prices
Lower volatility = lower option prices

Step 5: Closing Your Position

You have three choices before expiration:

1. Close the Trade

Buy back what you sold (if you sold)
Sell what you bought (if you bought)
Lock in your profit or loss

2. Let It Expire

Out-of-the-money options expire worthless
In-the-money options are exercised automatically

3. Exercise or Get Assigned

Call buyers can exercise to buy shares
Put buyers can exercise to sell shares
Sellers can be assigned the opposite

Step 6: Expiration and Settlement

At Expiration:

Scenario	Call	Put
Stock > Strike	In-the-money (exercised)	Out-of-the-money (worthless)
Stock = Strike	At-the-money	At-the-money
Stock < Strike	Out-of-the-money (worthless)	In-the-money (exercised)

Automatic Exercise: Most brokers automatically exercise options that are at least $0.01 in-the-money at expiration.

Real Example: Selling a Put

Let's walk through selling a cash-secured put:

Setup:

Stock XYZ is at $100
You sell the $95 put for $2.00
You receive $200 premium
You need $9,500 cash to secure the position

Scenario A: Stock stays above $95

Option expires worthless
You keep the $200 premium
Return: 2.1% on $9,500

Scenario B: Stock drops to $92

You're assigned 100 shares at $95
Your cost basis: $95 - $2 = $93/share
You now own shares and can sell covered calls

Key Dates to Know

Date	Meaning
Trade Date	When you open the position
Expiration Date	Last day the option exists
Settlement Date	When shares/cash are exchanged (usually T+1)
Ex-Dividend Date	Important for call assignment risk

Common Mistakes to Avoid

Not understanding assignment - Know when you might be assigned
Ignoring expiration - Don't let ITM options expire accidentally
Wrong position size - Each contract is 100 shares
Forgetting about early assignment - American options can be assigned anytime

In the next lesson, we'll break down the difference between calls and puts in more detail.

How Options Work Step by Step