Ratio Spread
A Ratio Spread is an options strategy in which an investor buys a certain number of options at one strike price and sells a greater number of options at a different strike price on the same underlying asset and expiration date, creating a net position where the number of options sold exceeds the number bought — most commonly in a 1:2 ratio — generating premium income while maintaining limited upside exposure but creating uncapped risk if the underlying moves beyond the short strikes in an adverse direction. The strategy profits when the underlying asset remains within a specific range at expiration.
Key takeaways
- In a 1:2 call ratio spread, the trader buys one call at a lower strike and sells two calls at a higher strike, collecting net premium but establishing uncovered (naked) short call exposure if the underlying rises sharply above the upper strike.
- The strategy typically generates a net credit (positive premium received), which represents the maximum profit if the underlying falls below the long strike at expiration.
- Maximum profit is achieved when the underlying expires exactly at the short strike, where the long call is in-the-money by its full amount but both short calls expire worthless.
- The breakeven on the upside is the upper strike plus the net premium received per unit of excess short exposure.
- Ratio spreads are a volatility strategy: they implicitly sell short gamma, profiting from low realized volatility but suffering if the underlying makes large moves.
Explanation
Ratio spreads are deployed by traders who have a directional or range-bound view and are willing to sell excess optionality (gamma) to enhance returns. The structure comes in two basic forms: ratio call spreads (for neutral-to-bullish views) and ratio put spreads (for neutral-to-bearish views). In a standard 1:2 call ratio spread, the trader effectively buys a call spread (long one call at K1, short one call at K2) and simultaneously sells an additional naked call at K2. The result is a position with defined upside to K2 but unlimited loss potential above the breakeven on the excess short.
The appeal of ratio spreads is their ability to generate positive premium income (a credit) or reduce the cost of a long options position to zero or near zero. For example, a trader who wants to own upside exposure in a stock but finds at-the-money options expensive might buy a call at the money and sell two calls at a strike 10% out of the money. If the stock is calm, both short calls expire worthless and the trader profits by the net premium received. If the stock rises to the upper strike, the long call's full value is captured while both short calls expire worthless, yielding the maximum profit.
The primary risk of the ratio spread is the excess short gamma position beyond the upper strike. If the underlying rallies aggressively through the short strike, the two short calls begin to accumulate losses faster than the one long call gains. Specifically, above the upper strike K2, the net position consists of the intrinsic value from the long call minus twice the intrinsic value from the short calls — a net liability of one call's intrinsic value. For a stock that gaps sharply higher — in response to a takeover bid or a blockbuster earnings report — the loss can be severe. Risk management discipline requires setting stop-loss levels or delta hedging the excess short exposure.
Time value decay (theta) generally benefits ratio spreads when the underlying remains stationary, since the excess short options decay faster as expiration approaches. This makes ratio spreads attractive in low-volatility environments or when implied volatility is relatively elevated and expected to decline. However, the vega exposure is typically net negative — the spread loses value if implied volatility increases — reinforcing the characterization of ratio spreads as a volatility-selling strategy.
Formula
Upside Breakeven = K2 + (Long Call Value at K2 + Net Premium) / Excess Short Calls
Example
A trader believes that XYZ stock, currently trading at $100, will move modestly higher but not sharply above $110 over the next month. XYZ options have implied volatility of 30%. The trader executes a 1:2 call ratio spread: buys one call with strike $100 at a premium of $4.00 and sells two calls with strike $110 at a premium of $2.20 each, collecting a net credit of $4.40 − $4.00 = $0.40. At expiration: if XYZ = $95 (below $100), both long and short calls expire worthless; profit = $0.40 (the net credit). If XYZ = $110 (at upper strike), the long call is worth $10 and both short calls expire at $0; profit = $10.00 − $0 + $0.40 = $10.40. If XYZ = $121 (breakeven on upside), the long call is worth $21, each short call is worth $11, net = $21 − $22 + $0.40 = -$0.60. Above $121, losses accumulate proportionally.
Related terms
At The Money Credit Default Swap Delta Expiration Date Fungibility Futures Price Gamma Hedging Implied Volatility Intrinsic Value Iron Condor Premium