Ratio Put Spread

Options Spreads Advanced Singapore STI DBS OCBC UOB SINGTEL KEPPEL CAPLAND

Moderately Bearish with Target Price

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Quick Reference

Strategy Type Complex Spread (Often Credit or Small Debit)
Market Outlook Moderately Bearish with Target Price
Risk Profile Limited upside, UNLIMITED downside risk below short strikes
Reward Profile Maximum profit at short strike price
Time Horizon 30-45 DTE recommended
Iv Environment High IV preferred (selling more options than buying)
Breakeven Upper: Long strike - net debit (if any) | Lower: Short strike - max profit / extra contracts

Payoff Profile

The ratio put spread creates an asymmetric payoff with maximum profit at the short strike. Limited upside risk but UNLIMITED downside risk if price falls too far. • At the short strike price at expiration • Limited to net debit paid (or profit if done for credit) • UNLIMITED below lower breakeven (substantial - to zero) • Two breakevens if done for debit; one lower breakeven always

Singapore Market Details

Primary Instruments STI Index Options, DBS Options, OCBC Options, UOB Options
Mas Compliance MAS regulated; retail trading permitted with licensed broker; MARGIN REQUIRED for naked portion
Contract Size S$5 per point for STI; 1,000 shares for equities; 100 shares for ETFs
Trading Hours 9:00 AM - 5:00 PM SGT (Pre-Open 8:30 AM - 9:00 AM)
Expiry Options Monthly expiries; limited weekly options
Settlement T+2 for shares; T+1 for SGX derivatives
Tax Treatment No capital gains tax for individuals in Singapore
Stamp Duty 0.2% on share purchases (buyer and seller each); options exempt
Cdp Account Central Depository (CDP) account required for share ownership; not needed for options

Frequently Asked Questions

Why would anyone accept unlimited downside risk?

Traders accept this risk because: (1) they have a specific price target and don't believe the underlying will fall below it significantly, (2) the entry can be done for zero cost or credit, (3) they plan to actively manage and close before losses accumulate. The key is having a strong thesis about the price floor and disciplined risk management.

What's the difference between a ratio put spread and selling naked puts?

In a ratio put spread, you have a long put that covers the first short put - only the extra short put(s) are naked. A 1:2 ratio has 1 covered short put and 1 naked short put. This means you profit from a moderate decline (unlike naked puts which profit if price stays flat or rises) and only face unlimited risk below the lower breakeven.

Can I lose money if the stock goes up?

It depends on your entry cost. If done for a credit, you keep that credit if the stock rises (profit). If done for a debit, you lose that debit if the stock rises above your long strike. The upside risk is limited and known at entry - it's the downside that has unlimited risk.

What margin is required for a ratio put spread?

Margin is required for the naked portion. In a 1:2 ratio, one short put is covered by the long put, but the second short put is naked and requires margin similar to selling a naked put. Check with your broker - margin requirements vary.

Should beginners trade ratio put spreads?

No. Ratio put spreads require advanced understanding of Greeks, active position management, comfort with unlimited risk, and discipline to exit before large losses. Beginners should master regular vertical spreads first. Only trade ratio spreads when you fully understand the unlimited downside risk.

How do I choose between 1:2 and 1:3 ratios?

1:2 ratio: One naked put, moderate downside risk, smaller credit/larger debit. 1:3 ratio: Two naked puts, higher downside risk, larger credit/smaller debit. Use 1:3 only when extremely confident price won't crash through target, as two naked puts create extreme downside exposure.

When should I roll vs close a ratio put spread?

Close when: Price approaches lower breakeven, thesis is wrong, or you've captured 50-75% of max profit. Roll when: You want to give the trade more time because thesis is still valid, and you can roll for a credit or small debit. Never roll just to avoid realizing a loss if your thesis has changed.

How does IV crush after events affect my ratio put spread?

IV crush helps your net short vega position. After events, if IV drops, your short puts lose value faster than your long put, benefiting you. However, be careful: if the event causes a price crash, the IV benefit won't offset the directional loss.

Can I convert my ratio put spread to eliminate downside risk mid-trade?

Yes. Buy a put at a strike below your short strikes to create a butterfly. This caps your downside risk at the cost of the additional put. You sacrifice some profit potential but gain protection from crashes. Do this if circumstances change and you're concerned about downside.

What if the stock gaps down overnight through my lower breakeven?

This is the nightmare scenario. You'll face immediate significant losses with no opportunity to manage. At market open, assess the situation. If the gap seems sustainable (bad news), close immediately to prevent further losses. This is why position sizing and avoiding high-risk periods is crucial.

How do I dynamically hedge a ratio put spread using delta?

Monitor your net delta continuously. As price falls below the short strike and delta becomes significantly positive, sell delta via underlying (CFDs, futures, ETF) to offset. For example, at +0.40 delta, sell 0.40 delta worth of underlying. This locks in losses on the options but prevents further downside. It's essentially converting to a delta-neutral position.

What's the optimal volatility environment for ratio put spread entries?

Look for: IV rank > 50% (expensive short puts due to put skew), steep put skew (OTM puts expensive relative to ATM), and expected IV contraction (post-event entries or calm market expectations). The ideal entry is when short put IV is elevated relative to ATM IV (your long put), maximizing the credit received or minimizing debit.

How should I integrate ratio put spreads into a portfolio?

Limit ratio put spreads to 3-5% of portfolio given unlimited downside risk. Use them as tactical bearish plays when you have strong conviction about support levels. Track aggregate portfolio delta and vega. Remember: in a crash, all correlations go to 1 and all ratio put spreads will get hurt simultaneously.

Why are ratio put spreads particularly dangerous during market crashes?

Crashes combine three negative factors: (1) Price falls rapidly toward/through your lower breakeven, (2) IV spikes dramatically (hurting your net short vega), (3) Correlations increase so all positions get hurt simultaneously. The IV spike is particularly painful because it happens exactly when you're also experiencing directional losses. This is why crash protection (buying the lower put wing) is often worth the cost.

What's the mathematical edge in ratio put spread trading?

Edge comes from: (1) Put skew making OTM puts relatively expensive, (2) IV overpricing the short puts relative to expected move, (3) Strong support at short strike limiting downside. Backtest your thesis - if the underlying historically respects your support level and options overstate crash probability, you have potential edge. But remember, the one crash that does happen can wipe out years of collected premium.

Related Strategies

Bear Put Spread
Put Backspread (1:2 reversed)
Put Butterfly

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