DEFINED RISK VS. UNDEFINED RISK
Plain English
A defined-risk trade is like renting a car with insurance — you know the worst-case cost upfront. An undefined-risk trade is like driving without insurance — if something goes really wrong, the bill could be enormous.
Going deeper
A defined-risk position has a known maximum loss at the time of entry. Examples include buying options (max loss = premium), debit spreads, and iron condors. An undefined-risk position does not have a capped maximum loss — the potential loss can be substantial or theoretically unlimited. Examples include selling naked calls or puts. Understanding this distinction is critical for position sizing and risk management. Most beginners should start exclusively with defined-risk strategies.
Examples
Defined Risk
You buy a Bull Call Spread for $2.00 on a $5-wide spread. Your max loss is $200, no matter what. Even if the stock drops 50%, you can only lose $200.
Undefined Risk
You sell a naked call at the $50 strike for $2.00. If the stock rockets to $100, you owe the difference: ($100 - $50) x 100 = $5,000 loss, minus the $200 premium = $4,800 net loss. If it goes to $200, you lose $14,800.