Ratio Spread (Call)

30-Second Summary

The ratio spread is the inverse of the back spread. Instead of buying volatility cheaply, you sell it aggressively — collecting more premium than a simple vertical spread, but exposing yourself to unlimited loss if the underlying surges past the uncovered short leg.

What Is a Call Ratio Spread?

A call ratio spread involves buying one lower-strike call and selling two higher-strike calls — all at the same expiration.

You collect a net credit at entry. If the underlying stays below the short strikes or moves modestly up to them, you keep the credit plus the profit from the long call. But above the short strikes, you are effectively short one uncovered call — and losses are unlimited.

How it differs from a vertical spread:

• A bull call spread: buy 1 lower, sell 1 higher — capped upside, capped loss
• A ratio spread: buy 1 lower, sell 2 higher — higher credit, max profit at the short strike, unlimited loss above

The trade-off: You collect significantly more premium than a vertical spread, but you take on naked short exposure above the long strike. This is why it is classified as an expert-level strategy.

Two variants:

• Call ratio spread (covered here) — mildly bullish bias, profits when underlying pins near the short strikes
• Put ratio spread — mildly bearish, buy 1 higher put, sell 2 lower puts

Setup & Execution

• Long strike: 7,500 (ATM)
• Short strikes: 7,550 × 2 (OTM)
• Strike width: 50 points
• Net credit: +$800
• Max profit: +$800 + (50 × 100) = +$5,800 at SPX 7,550 at expiry
• Upper breakeven: 7,550 + ($5,800 ÷ 100) = 7,608
• Below 7,500: +$800 (keep the credit flat)

Execution note: Enter as a net limit order. VIX elevated at 22 makes the short calls worth more, improving the credit. A common approach is to target a credit of at least 30–40% of the spread width.

The Payoff Diagram

The Seller’s Reality

The ratio spread is a seller’s trade — net short options — so time decay and IV contraction work in your favor. But selling 2 calls while buying only 1 means you have an uncovered short call above the long strike. This is where the danger lives.

Brokers require significant margin. The uncovered short call above 7,550 will require margin similar to a naked short call. Most brokers require full options approval (Level 4–5) and substantial account equity.

The strategy has a high win rate in quiet markets — but when it loses, it can lose large. A 10% rally that takes SPX from 7,500 to 8,250 would produce a theoretical loss of hundreds of thousands of dollars on one SPX ratio spread. Traders typically define maximum acceptable loss levels and set stops well before the upper breakeven.

Understanding the Greeks

Negative gamma is the defining risk. Above the short strikes, gamma turns against you — every point SPX rises costs more than the last. This is the opposite of the back spread. Positive theta and negative vega reward patient sellers in high-IV, range-bound markets.

Trade Management

1. Take profit at 50–75% of max profit. A common approach is to close the spread when P&L reaches +$3,000–+$4,000 rather than holding for the full +$5,800. This reduces time in the trade and eliminates late-expiry risk.
2. Set a hard stop at the upper breakeven. If SPX approaches 7,608, exit the entire position. The rate of loss above that level accelerates sharply due to negative gamma.
3. Hedge the uncovered short if the underlying surges. Some traders buy a further OTM call to cap the upside risk when the trade moves against them — effectively converting it into an iron condor or butterfly.
4. Close 10–14 DTE. As expiration nears and gamma risk peaks, holding the uncovered short becomes increasingly dangerous. Time value erosion is largely captured by this point.

Real-World Example

Scenario A — The Perfect Pin (Win): SPX opens at 7,500, VIX at 22. Traders expect a quiet month with no major catalysts. The ratio spread is entered for +$800. SPX grinds to 7,547 by expiry.

At 7,547:

• Long 7,500 call: +$4,700
• Short 2 × 7,550 calls: $0 (still OTM)
• Net P&L = +$800 + $4,700 = +$5,500 (near max profit)

The trader exits the day before expiry and collects 95% of max profit.

Scenario B — The Breakout (Loss): Same entry. An unexpected Fed statement triggers a risk-on rally. SPX surges to 7,640 in two sessions.

At 7,640:

• Long 7,500 call: +$14,000
• Short 2 × 7,550 calls: −$18,000
• Net P&L = +$800 + $14,000 − $18,000 = −$3,200

The trader had a stop at 7,608. They exited at approximately 7,610 for a loss near −$600, well before the full damage materialized.

When to Use

Use a ratio spread when:

• IV is elevated (VIX above 20) — you collect more premium on the two short calls
• You expect the underlying to make a modest move toward the short strikes and stall
• You want to express a mildly bullish view with a high probability of profit
• You are comfortable managing an uncovered short position with a hard stop

Avoid a ratio spread when:

• A major catalyst (FOMC, earnings) is upcoming — unexpected breakouts above the short strikes can cause large losses
• IV is low — the collected credit may not compensate for the unlimited short risk
• You cannot monitor the position daily — the uncovered short leg requires active management

Strategy Ladder

This content is for educational purposes only and does not constitute financial or investment advice. Options trading involves significant risk of loss. Always consult a qualified financial professional before trading.