Lesson 16 of 20 · 6 min
What "defined risk" actually means
Defined risk means the maximum loss is computable, not that it is small.
Defined risk is one of the most load-bearing phrases in options discussion, and it carries much less than people assume.
It means exactly this: the position's worst possible outcome at expiry is a specific number you can compute in advance. That is a real and useful property. Unbounded positions do not have it, and the difference between a known maximum and no maximum is genuine.
What it does not mean: that the number is small, that the probability of reaching it is low, or that the loss will arrive gradually. A short put is defined risk. Its defined risk on a $50 strike is $4,800 against $200 of premium. A four-leg structure can be defined risk and still lose its entire maximum in a single session on a gap. Defined is a statement about arithmetic, not about magnitude or comfort.
Two further gaps between the phrase and reality. First, the defined maximum applies at expiry; before expiry a position can be marked below its eventual worst case, and margin requirements are computed on live values. Second, the definition assumes you can hold to expiry, which assumes meeting margin calls and finding liquidity — both of which lesson 12 and lesson 13 showed are least available under stress.
The honest reading: defined risk tells you the number exists. It is then your job to look at the number.
Key terms
- Defined risk
- A position whose maximum loss at expiry is a computable, finite number.
- Maximum loss
- That number. Worth computing in dollars and as a ratio to the maximum gain, since the two are often very different.
- Path risk
- The risk that events before expiry — margin calls, illiquidity, forced closure — prevent you from reaching the defined outcome.
Worked example
Three defined-risk positions with very different numbers
All at a $50 underlying, one contract each.
- Long $50 call at $2.00
- Max loss $200
- $50/$55 call structure, net $1.20
- Max loss $120
- Short $50 put at $2.00
- Max loss $4,800
- All three descriptions
- Defined risk
- Range of maximum losses
- $120 to $4,800
Max gain unbounded.
Max gain $380. Ratio about 1:3.
Max gain $200. Ratio 24:1.
Forty-fold.
One phrase, three positions, a fortyfold difference in the worst case. The phrase did not distinguish them; the arithmetic did.
Check yourself
Someone describes a short $50 put with a $2.00 premium as a defined-risk position. Is that accurate, and what is the number?
Saved in this browser only. No account, nothing sent anywhere.
Educational only. Nothing in this lesson is investment, legal or tax advice, or a recommendation to enter into any transaction. Figures are illustrative and computed from the inputs stated in the lesson.