Ratio Spread

A ratio spread is a vertical-spread variant built with an unequal number of long and short options — most commonly buying one option and selling two at a further-out-of-the-money strike (a 1×2, or "front-ratio," spread). Because there is one extra short option, the position carries a net short option that is not covered by a long on the same side. The result is a low-cost (often credit) directional structure that deliberately harvests volatility skew, behaves omnidirectionally, and — when the extra short is naked — carries undefined risk on the over-sold side. This entry covers the front-ratio spread (the premium-seller's default) and its mirror, the back-ratio spread, and connects both to the sibling structures: the jade lizard and the broken-wing butterfly.

Foundations referenced throughout: 03_implied_volatility (skew, IV Rank, vega), 02_probability (POP, delta-as-probability), 05_trade_management (50%/21-DTE), 06_portfolio_management (net delta, sizing), and the related strategies 11_credit_spreads, 10_iron_condors, and 13_diagonals (the ZEBRA stock-replacement back-ratio).

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1. Overview & Purpose

A ratio spread answers a specific problem: I have a directional lean, but I do not want to pay full price for a long option, and I believe the underlying will move only moderately (or not violently against me). By selling more options than you buy, you finance the long leg with extra short premium. In its canonical form — the front-ratio spread — that financing is so complete that the trade is put on for a net credit, giving it no risk on one side at all.

Standard strategy guides frame the front-ratio spread plainly: a call front-ratio spread is "a long call spread with an extra short call to finance the trade and receive a net credit overall," and a put front-ratio spread is "a long put spread with an extra short put to finance the trade and receive a net credit overall." Both are described as omnidirectional, undefined-risk trades.

The strategic purpose is threefold:

1. Cheapen a directional bet. The long spread alone would cost a debit; the extra short converts it to a credit or near-even-money entry.

2. Exploit volatility skew. Because OTM options on the skewed side of the market are bid up in IV (puts in equity indices; sometimes calls in commodities), selling the extra option there collects more premium and lets you place the spread wider for the same credit. As experienced sellers put it, "front-ratio spreads can be made much wider if placed on the skewed side of the market" — and they "use this skew to their advantage."

3. Build a tent of profit at the short strike while leaving a credit cushion if the trade goes the other way.

A back-ratio spread (buy 2, sell 1) inverts this: it is a debit, long-volatility, long-gamma structure used either as a cheap convexity play or — in the ZEBRA application — as a defined-risk stock replacement.

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2. Structure & Payoff

The defining feature is the leg imbalance. The two common builds:

Call front-ratio spread (bearish-to-neutral lean, 1×2):

Buy 1 call at a near strike (e.g., ATM / lower strike)
Sell 2 calls at a higher strike (the short strike)
Net: a long call spread plus one extra naked short call; typically a net credit.

Put front-ratio spread (bullish-to-neutral lean, 1×2):

Buy 1 put at a near strike (e.g., ATM / higher strike)
Sell 2 puts at a lower strike (the short strike)
Net: a long put spread plus one extra naked short put; typically a net credit.

The single extra short option is the source of both the credit and the open-ended risk. Maximum profit sits at the short strike at expiration, where the long leg is fully in-the-money and the shorts expire worthless or at minimal value.

ASCII payoff at expiration — Put front-ratio spread (1×2)

Buy 1 put @ 100, Sell 2 puts @ 95, net credit received. No risk to the upside; risk builds below the short strike (one short put is naked).

A call front-ratio is the mirror image: a flat credit region to the downside, a profit peak at the upper short strike, and open-ended loss to the upside where the naked short call lives.

A back-ratio spread (buy 2 / sell 1) flips the diagram vertically: limited loss near the strikes (the debit, or a small credit), and expanding profit as the underlying runs in the long direction — a long-gamma "rocket" payoff.

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3. When to Use

You have a directional lean but expect a measured move, ideally toward (not violently through) your short strike. Max profit is realized if price drifts to the short strike at expiration.
There is exploitable skew on the side you want to sell. Equity-index put skew makes put front-ratio spreads especially efficient — you sell the rich OTM puts and can widen the structure.
You want a credit entry with "no risk to one side." Because the put front-ratio is put on for a credit, there is no upside risk; the call front-ratio has no downside risk. The credit is yours if the underlying moves the "safe" direction.
IV is elevated. Like other net-short-premium trades, you collect more credit and have more skew to harvest when implied volatility is high (IV Rank elevated).
Back-ratio (buy 2 / sell 1): when you want cheap convexity for a potentially large move, or a stock replacement with defined downside (the ZEBRA — buy 2 deep-ITM ~75-delta calls, sell 1 ATM ~50-delta call, for ~100 delta with near-zero extrinsic value).

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4. When NOT to Use

When you cannot tolerate undefined risk. The extra naked short makes the front-ratio's risk open-ended on the over-sold side. If the underlying blows through the short strike, losses compound roughly 1:1 with the move beyond the long leg's coverage. These are explicitly undefined-risk trades; the naked portion "is where the risk lies."
In a small or cash account that cannot support naked-option buying power, or where naked options are not permitted by your trading level. Prefer the broken-wing butterfly (defined-risk cousin) instead.
When you expect a violent move toward the short side (e.g., into a binary event like earnings on the side you sold extra). The peak-at-the-short-strike payoff turns into a loss if price overshoots.
When skew does not favor the side you're selling. A call front-ratio in equity indices fights the put-skew tailwind; the structure prices less attractively. "Skew simply doesn't favor call" ratio/broken-wing structures in index products.
In very low IV — there is little premium to harvest, the credit shrinks, and the risk/reward of carrying a naked short deteriorates.
Back-ratio caveat: do not put on a debit back-ratio expecting it to sit still. With back-ratios "time is generally not on your side" — they need a move to pay off and decay against you in a flat tape.

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5. Entry Criteria

A practical entry note on the platform: most order-entry tickets let you set unequal leg quantities directly (e.g., 1×2) when building a ratio.

See 03_implied_volatility for IV Rank and skew mechanics and 02_probability for delta-as-probability strike selection.

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6. Greeks Exposure

The Greeks of a ratio spread shift materially with the ratio and with where the underlying sits relative to the strikes — this is the single most important nuance of the structure. The figures below are for a front-ratio (net short one option) near entry, with the underlying between the long and short strikes.

For a back-ratio (net long one option) every sign flips: positive gamma, negative theta, positive vega — a long-volatility profile. The ZEBRA is a special, near-delta-100, near-zero-extrinsic case engineered so the long and short extrinsic values cancel, leaving stock-like delta with only slightly negative theta.

Canon to internalize: "the Greeks shift materially with the ratio." A 1×2 behaves very differently from a 1×3, and the same 1×2 behaves differently at entry versus when price is camped on the short strike at 5 DTE. Re-read the Greeks before adjusting.

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7. Volatility Exposure

A front-ratio spread is net short vega because you hold one more short option than long. You profit from IV contraction and lose from IV expansion, all else equal — the same volatility posture as a strangle or credit spread.
This is why elevated IV Rank is the preferred entry environment: you sell inflated premium, and mean-reverting IV provides a tailwind (vol crush) on top of the directional thesis.
Skew is the second-order volatility edge. Because OTM options on the skewed side carry higher IV, the extra short collects disproportionate premium — letting you push the short strike further out and widen the no-risk zone. This is the core insight behind ratio spreads.
A back-ratio is net long vega — it wants IV expansion and is the structure to reach for when you expect volatility to rise and the underlying to move.

Conflict to flag honestly. A front-ratio is short vega yet also benefits from a large favorable move (the long leg). It is not a pure short-vol trade like a strangle; it is a hybrid — short vega and short gamma, but with built-in directional convexity on the long side. Treat the vega label as net, not absolute.

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8. Expected Behavior

P/L drivers (front-ratio, credit):

1. Direction — the dominant driver. Profit peaks if price lands at the short strike at expiration.

2. Theta — positive; you collect decay while price sits in the profit zone.

3. IV / vega — short; vol crush helps, vol spike hurts.

Max profit, max loss, breakevens (put front-ratio, buy 1 @ A, sell 2 @ B, A > B, net credit C):

Max profit = (spread width A − B) + credit C, realized at strike B at expiration.
Max loss (upside) = none; you keep the credit C if price stays at/above A (no upside risk).
Max loss (downside) = undefined — the naked short put loses ~1:1 with the underlying below the lower breakeven, toward a floor of zero on the stock.
Upper breakeven ≈ none in the loss sense (credit kept above A). Lower breakeven ≈ short strike B − (max profit) = B − [(A − B) + C]. Below that point the position turns net negative.

Probability of profit. Because the trade is omnidirectional with a no-risk side and a credit, the POP is generally high — profit accrues across a wide band (anywhere on the no-risk side, plus the tent up to and beyond the short strike until the lower breakeven). The trade-off is the fat, low-probability tail loss on the over-sold side. Recall the house caveat that delta-based probability estimates can overstate realized win rates; size for the tail.

A concise summary: a put front-ratio is "omnidirectional… profitable from an increase in the stock price or a move down towards the short strikes," with "no risk to the upside, but max profit at the short strike."

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9. Capital Requirements / Buying Power

Front-ratio (naked extra short): buying power is driven by the naked option, calculated like a single short option (the standard 20%-of-underlying / 10%-OTM style requirement on equities), plus the defined-spread component. Treat BP and risk as if you were short a naked option, because you are. See 06_portfolio_management and 20_position_sizing for sizing the naked exposure.
Defined-risk alternative: convert the naked short into a broken-wing butterfly by buying a cheap further-OTM wing. This caps the risk and collapses buying power to the defined max loss — the standard way to run a "ratio spread with defined risk" in a small account.
Back-ratio / ZEBRA (debit): buying power equals the debit paid, which is also the max loss — capital-efficient stock replacement at a fraction of the share cost while retaining ~100 delta.
Pairing for BP efficiency: a call back-ratio combined with a put credit spread (non-overlapping strikes) can share buying power, since both cannot finish ITM at once.

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10. Adjustment Criteria

The front-ratio's defense problem is the naked side. The standard adjustment logic applies, adapted to the imbalance:

Roll the untested/tested structure out in time to collect more credit and widen the no-risk zone, buying time for the thesis. Back-ratio and ratio positions are routinely defended and managed, not held passively.
Convert to defined risk under stress. If the underlying threatens the naked short, buy a further-OTM option to turn the ratio into a broken-wing butterfly, capping the tail. This is the cleanest defense of the over-sold side.
Roll the short strike (the extra short) further OTM, or add a long to reduce the ratio (1×2 → 1×1), neutralizing the naked exposure if the move accelerates.
Defend the untested side of any companion credit spread (e.g., in a ratio-plus-credit-spread combo) by rolling it closer once it has lost most of its value — the same untested-side mechanic taught in 21_trade_adjustments.
Back-ratio (debit) defense: because time works against you, the decision set is stay, modify, or exit as the thesis confirms or fails — these are best managed on a shorter clock (≈28→21 DTE) rather than letting decay grind.

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11. Exit Criteria

Profit target. Take the credit/winner early. The standard house management rule — close at ~50% of max profit — applies to the net-short front-ratio just as to other premium trades. Front-ratios are frequently entered for a credit and exited for an additional credit when the move cooperates.
21 DTE. Manage by ~21 days to expiration to sidestep the accelerating negative gamma around the naked short — the same gamma-risk rationale behind the firm-wide 21-DTE guideline. See 05_trade_management.
Defense/stop. There is no clean "stop" on an undefined short; the discipline is to convert to defined risk or reduce the ratio if the underlying approaches the over-sold strike (Section 10) rather than letting the naked tail run.
Winning back-ratio. There is dedicated guidance on managing a winning ratio spread — when the long-gamma payoff pays off, harvest it rather than hoping for more, because theta and IV mean-reversion will start to bleed the gains.

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12. Historical Research Findings

The ratio-spread research is delivered through show segments rather than a single tabulated study paper. The recurring, evidence-graded findings:

Skew makes the front-ratio efficient. Placing the ratio on the skewed side of the market lets you widen the spread for the same credit — the central empirical claim of the Ratio Spreads and Skew segment.
Wide vs. narrow is a deliberate trade-off. Dedicated research has examined choosing ratio-spread width — wider strikes lower the probability of the short being breached but reduce credit/peak profit; narrower concentrates profit nearer current price.
Back-ratios must be actively defended. Options Workshop covered defending and managing back-ratios specifically because time decay works against the debit structure — passive holding is discouraged.
The ZEBRA stock-replacement result. Industry educators popularized the Zero Extrinsic Back Ratio (buy 2 ~75Δ calls, sell 1 ~50Δ call) as a way to obtain ~100 delta — stock-like upside — for a fraction of the share cost with defined downside. Third-party write-ups corroborate the ~100-delta / near-zero-extrinsic construction.
A standing trade checklist exists. A Trade Checklist: Ratio Spread segment has been published, evidence that the structure is part of the taught core curriculum, not a one-off.

Honest limitation. These are video segments, not downloadable backtest papers; the precise win-rate and P/L-per-day statistics are presented on-screen and are not text-extractable here. The directional conclusions above are robust house canon; the exact numbers are not independently reproduced in this entry.

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13. Worked Example

Setup — Put front-ratio spread (1×2) on a $100 stock, elevated IV Rank, ~45 DTE, put skew present.

Buy 1 put @ 100 (near ATM)
Sell 2 puts @ 95 (OTM, on the rich-IV put-skew side)
Long put cost ≈ $3.10; each short put ≈ $1.70 → 2 × $1.70 = $3.40 collected.
Net credit ≈ $0.30 (i.e., $30 per spread).

Components of the position:

A long put spread (long 100 / short 95) — defined-risk, bullish-to-neutral.
One extra short 95 put — naked, the source of downside risk and most of the credit.

Outcomes at expiration:

Interpretation. The trade wins across a very wide band — anywhere at or above $100 (credit kept), and from $100 down to ~$89.70 (the tent). It peaks at $95. The price of that broad win zone is the open-ended risk below ~$89.70 from the one naked put. Management: take ~50% of the credit/profit early, manage by 21 DTE, and if the stock breaks toward $95–90, buy an OTM put (say the 88) to convert into a broken-wing butterfly and cap the tail.

ZEBRA contrast (back-ratio). On the same $100 stock you could instead buy 2 calls @ ~92 (≈75Δ) and sell 1 call @ ~100 (≈50Δ) for a net debit, obtaining ~100 delta with near-zero extrinsic value — stock-like upside, with the debit as your defined max loss.

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14. Key Takeaways

A front-ratio spread = a long vertical spread plus one extra short option, usually for a net credit: a low-cost, omnidirectional, directional-lean trade with no risk on one side and undefined risk on the over-sold (naked) side.
Skew is the edge. Selling the extra option on the skewed (high-IV) side lets you widen the spread for the same credit — the core ratio-spread insight.
Max profit sits at the short strike; the credit is your buffer on the safe side. POP is high; the cost is a fat tail on the naked side.
Greeks move with the ratio — front-ratio is net short gamma / short vega / positive theta; back-ratio flips to long gamma / long vega / negative theta. Re-read the Greeks before adjusting.
Manage like short premium: ~50% profit, ~21 DTE, and convert to a broken-wing butterfly (buy a far wing) to defend the naked tail.
Sibling structures: the jade lizard (short put + short call spread, no upside risk, balanced 1:1:1) and the broken-wing butterfly (a ratio spread with a defined-risk wing) solve the same skew/credit problem with different risk profiles; the ZEBRA is a back-ratio used as defined-risk stock replacement.
Size to the naked short, not the spread. The undefined leg dominates risk and buying power.

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15. Sources

Ratio Spreads and Skew, Options Trading Concepts Live (04-13-2021): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
How to Choose Ratio Spreads: Wide or Narrow, industry research (04-13-2021): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Defending the Back Ratio Spread, Options Workshop (08-27-2018): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Back Ratio Management, Options Workshop (08-24-2018): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Managing a Winning Ratio Spread, industry research (04-14-2020): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Trade Checklist: Ratio Spread, options education (04-19-2016): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Adjusting option order quantity for ratio spreads (Help Center): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Options Strategy Guide 2023 (call/put front-ratio spread definitions): https://www.scribd.com/document/715051216/This approach-Options-Strategy-Guide-2023
Jade Lizard Option Strategy (sibling structure): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Managing Winning Options Positions (50% rule): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
What is Vega in Options Trading? (short-vega rationale): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
What is Theta in Options Trading? (positive-theta rationale): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
What is Gamma in Options Trading? (negative-gamma / 21-DTE rationale): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Options Delta Explained (delta overstatement caveat): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Strangle / Short Strangle (45-DTE entry cadence): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
Volatility Metrics (IVR, IV%, IVx, HV), Help Center (high-IV rule): https://www.theocc.com/company-information/documents-and-archives/options-disclosure-document
ZEBRA Options Strategy (third-party explainer): https://optionsjive.com/blog/zebra-options-strategy/
Data Driven Options — Ratio Spreads: https://datadrivenoptions.com/strategies-for-option-trading/basic-trading-strategies/ratio-spreads/
Data Driven Options — The Call Back Ratio Spread: https://datadrivenoptions.com/strategies-for-option-trading/favorite-strategies/call-backspread/
Data Driven Options — 21-Day Broken Wing Put Butterfly (BWB / skew relationship): https://datadrivenoptions.com/strategies-for-option-trading/favorite-strategies/broken-wing-put-butterfly/
Days to Expiry — The 21 DTE Rule Explained (third-party summary of the DTE study): https://www.daystoexpiry.com/blog/the-21-dte-rule-explained-when-and-why-to-close-options-positions-early

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_Evidence-labeled per the Project Charter. Education only, not financial advice._