Skip to main content
Trading & Risk

What Is an Option?

Pomegra Learn

What Is an Option?

An option is a financial contract that grants its holder the right, but not the obligation, to buy or sell an underlying security at a specified price on or before a specified date. This fundamental distinction—the right without the obligation—separates options from futures and forwards, which create binding commitments. When you own an option, you control whether to exercise it based on market conditions at the time of expiration. This asymmetry of rights and obligations is what gives options their distinctive risk and reward profile.

To grasp why options matter, consider an insurance analogy. If you own a house, you purchase homeowner's insurance to protect against loss. You pay a premium upfront. If your house never burns down, you don't collect any payout, yet you were still protected during that period. An option works identically: you pay a premium for the right to protect or profit from a price move in a stock or index. If conditions don't develop as you anticipated, you let the option expire unexercised, and your cost is simply the premium paid. This insurance-like structure is deliberate—options markets evolved partly to serve hedging needs, allowing investors and businesses to insure against unfavorable moves.

The 100-Share Standard​

Unlike a stock, which represents ownership of one share, one standard equity option contract controls 100 shares of the underlying stock. This standardization emerged from how futures and options markets evolved over decades and has become the universal convention on major exchanges. When you see an option quoted at a premium of, say, $3.00, that quote represents the price per share of the underlying—so buying one contract costs you $300 (plus transaction fees). This 100-multiplier matters enormously for position sizing and risk management. A trader buying one call contract is not betting small; that trader is committing to the rights to purchase 100 shares if exercised.

Why Options Markets Exist​

Options markets serve multiple constituencies. For hedgers, options provide insurance: a farmer might buy put options on corn prices before harvest, locking in a worst-case sale price while leaving upside open. For speculators, options offer leverage—controlling a large quantity of shares with a small upfront premium payment. For market makers and sophisticated investors, options are arenas for complex relative-value and volatility trading strategies. The existence of options expands the universe of investable views. Whereas a stock investor can only bet on direction—up or down—an option trader can bet on volatility, time decay, mean reversion, earnings surprises, and dozens of other phenomena independently of directional conviction.

The options market itself provides crucial price discovery. Options prices encode market consensus about future volatility, implied moves before earnings, and the probability-weighted likelihood of various price outcomes. Traders worldwide watch options chains to gauge what large professional investors are hedging or positioning for. When implied volatility spikes, it signals fear; when it collapses, it signals confidence. In this way, the existence of options enhances the information content of financial markets as a whole.

What This Chapter Covers​

This chapter establishes the foundation: options as contracts with conditional rights, the insurance analogy, the mechanical 100-share standard, and the multiple reasons these instruments have grown into the world's largest derivatives market by notional value. The articles that follow build on this framework by introducing the two primary option types—calls and puts—then progressively layering in the mechanics of strikes, expirations, premiums, and the critical concepts of intrinsic and extrinsic value that govern how options are priced and managed.

Articles in this chapter​