Educational

What Are Stock Options?

An option is a contract that gives the buyer the right — but not the obligation — to buy or sell 100 shares of a stock at a specific price before a specific date. Used for income, hedging, leverage, and speculation.

Risk warning

Options can expire worthless. You can lose 100% of your premium quickly. Selling uncovered options exposes you to potentially unlimited losses. Vestovix is a research site, not investment advice — consult a licensed broker before trading options with real money.

The Basics

Call Options
A call gives you the RIGHT to BUY 100 shares at a specific price (the "strike") before a specific date. You pay an up-front cost called the premium. Profitable when the stock rises above strike + premium.
Put Options
A put gives you the RIGHT to SELL 100 shares at the strike price before expiration. Also bought with a premium. Profitable when the stock falls below strike − premium. Often used as insurance.
Implied Volatility (IV)
The market's forecast of how much the stock will move before expiration. Higher IV → higher premiums (uncertainty is priced in). IV crashes after earnings — a known phenomenon called "IV crush."

Common Strategies

Covered Call

Income

You own 100 shares and SELL one call against them. You collect premium up-front; if the stock stays below the strike, you keep the premium and the shares. Above strike, your shares get called away at that price.

Risk: Caps upside; you still bear all downside.

Cash-Secured Put

Income / Entry

You hold enough cash to buy 100 shares at a strike you're comfortable with, then SELL a put. You collect premium; if assigned, you buy the shares at your chosen entry price.

Risk: You must be willing to own the stock at the strike.

Long Call

Directional Bullish

Buy a call expecting the stock to rise. Maximum loss is the premium paid; maximum gain is theoretically unlimited.

Risk: Time decay works against you; can lose 100% of the premium if the stock stays flat or falls.

Long Put

Hedging / Bearish

Buy a put expecting the stock to fall, or to protect existing shares. Capped loss (the premium), profit grows as the stock drops.

Risk: Same time decay; needs meaningful price movement to overcome the premium cost.

Vertical Spread

Defined Risk

Buy one option AND sell another at a different strike — same expiration. Caps both your max loss AND max gain, which makes the position cheaper than a naked long.

Risk: Less profit potential than buying outright; still expires worthless if the move doesn't happen.

Glossary

Premium
The cost (per share, × 100) you pay or receive to enter an option position.
Strike price
The price at which the option can be exercised.
Expiration
The last day the option is valid. After expiration the option is either exercised, sold, or expires worthless.
In the money (ITM)
Calls: stock price > strike. Puts: stock price < strike. Has intrinsic value.
Out of the money (OTM)
Calls: stock price < strike. Puts: stock price > strike. Only has time value.
Open interest
Number of contracts currently open at a given strike — a liquidity gauge.
Greeks
Delta (price sensitivity), Theta (time decay), Vega (volatility sensitivity), Gamma (rate of delta change).
Try the math first
Model a covered call, cash-secured put, or long option payoff before risking real money.
Options Calculator →