Ratio Spread¶
OVERVIEW¶
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.
| Construction | Long Leg | Short Legs | Risk Side |
|---|---|---|---|
| 1×2 Call Ratio Spread | 1 lower-strike call | 2 higher-strike calls | Unlimited upside |
| 1×2 Put Ratio Spread | 1 higher-strike put | 2 lower-strike puts | Substantial downside |
Note
A ratio spread is not the same as a backspread. A ratio spread is short more contracts than long; a backspread is long more contracts than short.
CONSTRUCTION AND PRICING¶
Standard 1×2 Call Ratio Spread¶
Assume underlying trades at $100:
| Leg | Action | Strike | Price | Net |
|---|---|---|---|---|
| Long call | Buy 1 | $100 | $4.00 debit | −$4.00 |
| Short calls | Sell 2 | $110 | $1.50 credit each | +$3.00 |
| Net cost | — | — | — | $1.00 debit |
Key Levels¶
| Level | Formula | Result |
|---|---|---|
| Max profit | (Short Strike − Long Strike) − Net Debit | $9.00 per share / $900 per spread |
| Upper breakeven | Short Strike + Max Profit | $119.00 |
| Below long strike | Full debit lost | −$1.00 per share |
Above $119, losses accelerate at $100 per dollar move — 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.
Tip
Above the upper breakeven, losses accelerate at $100 per dollar move — one naked call remains uncovered. Always size the position around the naked leg, not the spread cost.
WORKED EXAMPLE¶
Scenario: AAPL at $205 in October 2024. Trader expects a grind to $220 by January expiration but no further.
| Leg | Action | Strike | Price | Net |
|---|---|---|---|---|
| Long call | Buy 1 Jan | $210 | $6.20 debit | −$6.20 |
| Short calls | Sell 2 Jan | $220 | $2.80 credit each | +$5.60 |
| Net cost | — | — | — | $0.60 debit ($60/spread) |
Outcomes at January expiration:
| AAPL Close | Payoff | Notes |
|---|---|---|
| Below $210 | −$60 | Full debit lost; all legs expire worthless |
| $220 | +$940 | Long $210 call worth $10.00; short $220 calls expire worthless |
| $229.40 | $0 | Upper breakeven — losses begin above this level |
| $240 | −$1,060 | ($240 − $229.40) × 100; losses grow with each dollar higher |
Max profit at $220: ($220 − $210) − $0.60 = $9.40 = $940 per spread
HOW TO USE¶
Ratio spreads are suited to moderate directional views with a specific price target — not runaway thesis trades.
| Use Case | Rationale |
|---|---|
| Earnings plays | Collect elevated IV on short legs against an implied move target |
| Post-breakout consolidation | Momentum stalled near resistance; limited further upside expected |
| High-IV environments | Two short options fund the long leg cheaply or generate a net credit |
| Ratio overwrite on long stock | Institutional overwrite converting covered call to higher yield at cost of upside |
Greeks Profile by Zone¶
| Zone | Delta | Gamma | Vega |
|---|---|---|---|
| Below long strike | Minimal | Neutral | Neutral |
| Between strikes | Long | Long | Long |
| Above short strike | Short (naked) | Short | Short |
LIMITATIONS AND COMMON MISCONCEPTIONS¶
| Misconception / Risk | Reality |
|---|---|
| "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. |
Tip
When evaluating margin impact in Tapeboard, filter by naked short exposure to see the true buying power reduction — not just the spread debit.