Short Put (Naked Put)
Description
Selling a put option uncovered to collect premium, betting the underlying stays above the strike through expiry.
Setup
- Sell one put option, typically out of the money.
- Have enough capital or margin set aside to take delivery if assigned.
Context
A common income and stock-acquisition play: the seller either keeps the premium if the underlying stays up, or ends up buying the underlying at an effective price below where it traded when the trade was opened.
Risk Profile
Maximum gain is the premium collected. Loss grows as the underlying falls below the strike, bounded only by the underlying reaching zero -- treated as effectively uncapped for position-sizing purposes.
Pros
- Collects premium immediately.
- A common way to acquire a desired underlying at a discount to the price when the trade was opened.
- Profits from time decay.
Cons
- Large loss possible on a sharp decline.
- Ties up meaningful margin or cash.
- Underperforms simply buying the underlying in a strong rally.
Effect of Time
Time decay favors the seller; the position gains value every day the underlying stays above the strike.
Effect of Volatility
Rising implied volatility hurts the position by inflating the value of the short option.
Look-Alike Strategies
Live Structure
| Position | Right | Ratio | Strike | Expiry | Premium | Fill Price | Est. Fee |
|---|---|---|---|---|---|---|---|
| Short | Put | 1 | $84500.0000 | 24 Sep 2026 | $299.5677 | $270.0328 | $25.3156 |
Estimated Cost to Assemble
An estimate of what entering this structure right now would really cost: filling every leg by crossing the spread (the ask when buying, the bid when selling) instead of at the mid-price, plus an estimated exchange fee. Real fees and fills can differ from this estimate.
Payoff & Greeks vs. Underlying Price
The Greeks curves are a Black-Scholes model using each leg's current implied volatility, holding time to expiry fixed -- not live exchange data at every price, which only exists at the current price (dashed line).
Payoff at Expiration
This structure's value and profit/loss at expiration, at a handful of specific prices: every leg's strike, every breakeven, the current spot, and the chart's own range.
| Underlying Price | Value at Expiration | Profit / Loss | Return on Cost |
|---|---|---|---|
| $67600.0000 | -$16900.0000 | -$16600.4323 | -5541.5% |
| $84200.4323 breakeven | -$299.5677 | $0.0000 | +0.0% |
| $84385.2600 current | -$114.7400 | $184.8277 | +61.7% |
| $84500.0000 | $0.0000 | $299.5677 | +100.0% |
| $101400.0000 | $0.0000 | $299.5677 | +100.0% |