What is a Ratio Spread? Definition, Formula, and Example
A ratio spread is an options strategy involving an unequal number of long and short contracts at different strikes, typically buying one option and selling two, designed to profit from a directional move within a specific range.
Ratio Spread Definition
A ratio spread is a multi-leg options strategy where a trader buys and sells an unequal number of contracts at different strikes within the same expiration. The most common construction is the 1×2 call ratio spread (buy one lower-strike call, sell two higher-strike calls) or 1×2 put ratio spread (buy one higher-strike put, sell two lower-strike puts). The unequal ratio means the position carries naked short exposure beyond the breakeven, giving it a defined profit zone with theoretically unlimited risk on one side.
How a Ratio Spread Is Constructed and Priced
A 1×2 call ratio spread on stock trading at $100:
- Buy 1 call @ $100 strike for $4.00 debit
- Sell 2 calls @ $110 strike for $1.50 credit each = $3.00 credit
- Net cost: $1.00 debit
Maximum profit occurs at the short strike at expiration:
Max Profit = (Short Strike − Long Strike) − Net Debit
= ($110 − $100) − $1.00 = $9.00 per share = $900 per spreadUpside breakeven:
Upper Breakeven = Short Strike + Max Profit
= $110 + $9.00 = $119.00Above $119, losses accelerate at $100 per dollar (one naked call remains uncovered). Below the long strike, the position loses the $1.00 debit. The position is short gamma and short vega above the short strike, long delta between the strikes.
Worked Example
A trader sees AAPL at $205 in October 2024 and expects a grind to $220 by January expiration but no further. They open a 1×2 call ratio spread:
- Buy 1 Jan $210 call @ $6.20
- Sell 2 Jan $220 calls @ $2.80 each = $5.60 credit
- Net debit: $0.60 per share ($60 per spread)
Max profit at $220 expiration: ($220 − $210) − $0.60 = $9.40 = $940 per spread. Upper breakeven: $220 + $9.40 = $229.40. If AAPL closes at $220 on expiration, the long $210 call is worth $10.00, the short $220 calls expire worthless — payoff $1,000 − $60 cost = $940. If AAPL rips to $240, losses are ($240 − $229.40) × 100 = $1,060 and growing.
When Traders Use Ratio Spreads
Ratio spreads are deployed when a trader has a moderate directional view with a specific price target, not a runaway thesis. Use cases:
- Earnings plays with implied move targets — collecting elevated IV on the short legs.
- Post-breakout consolidation where momentum has stalled near a resistance level.
- High-IV environments where selling two short options funds the long leg cheaply or for a credit.
Institutional desks use ratio spreads as overwrites against existing long stock positions, converting a covered call into a ratio overwrite for higher yield at the cost of upside risk.
Limitations and Common Misconceptions
- "Limited risk" is wrong — a 1×2 call ratio has unlimited upside risk; a 1×2 put ratio has substantial downside risk to zero. Always size for the naked leg.
- Pin risk at the short strike — maximum profit exists only at expiration at the short strike; closing early often captures only 40–60% of theoretical max.
- Negative gamma — small moves through the short strike feel fine, large moves accelerate losses violently.
- Margin requirements — brokers margin the naked short leg, which can be 20% of underlying notional plus the spread loss.
- Not the same as a backspread — a ratio spread is short more contracts than long; a backspread is long more contracts than short.