Short Strangle

The main advantage is a wider profit zone. With a short strangle, you can profit anywhere between two OTM strikes, not just at a single ATM strike. This gives higher probability of profit. The tradeoff is less premium collected. Choose strangle when you want higher probability; choose straddle when you want maximum premium.

Margin varies by broker and strike selection. For STI options, expect S$3,000-10,000 per strangle depending on how far OTM your strikes are. Wider strikes (further OTM) require less margin. Your broker calculates margin based on potential loss scenarios. Always have 50% extra margin as buffer.

Yes, absolutely. In extreme market moves (crashes, short squeezes, gaps), losses can exceed your margin. This is why short strangles require significant capital beyond just the margin requirement. Only trade with capital you can truly afford to lose, and always have stop-loss rules.

Common deltas are 16 (one standard deviation, ~84% probability OTM), 20 (~80% probability), 25 (~75% probability), or 30 (~70% probability). Lower delta = less premium but higher probability. Start with 16-20 delta as a beginner for higher probability of success.

No. Short strangles require advanced understanding of Greeks, active position management, significant capital for margin, and emotional discipline to handle unlimited risk. Beginners should start with defined-risk strategies like iron condors. Build experience with defined-risk premium selling before attempting naked strangles.

Roll when: Your thesis (range-bound market) is still valid, and the tested side's delta is approaching your threshold (e.g., 0.40) but hasn't breached the strike. Close when: The strike is breached with momentum, your thesis is invalidated (trend emerging), or loss exceeds your maximum tolerance. Rolling extends your timeline but also extends your risk exposure.

Options: (1) Roll the threatened side up/down and out for credit, (2) Close the threatened side and hold the profitable untested side, (3) Add a spread on the opposite side to collect more premium, (4) Close entire position if thesis is broken. The key is acting before the strike is breached, not after.

Monitor aggregate Greeks, not just individual positions. Track total delta (keep near zero), total vega (cap negative vega at acceptable level), and total theta (your daily income). Stagger expirations so not all positions expire same week. Manage correlation - Singapore stocks move together in stress.

Generally no for index options (cash settled anyway). For stock options, assignment means owning stock at the strike price. If you want the stock and have the capital, assignment might be acceptable. But usually, rolling or closing is preferable to avoid capital tie-up and continued downside risk. Decide based on your thesis about the stock.

If you collected S$250 credit, the strangle is worth S$250 at entry. At 50% profit, the strangle is worth S$125 (you'd pay S$125 to close). Your profit is S$125. To achieve this: place a buy-to-close order at your target price, or monitor and close manually when reached. Most strangles reach 50% profit well before expiration if the range holds.

In backwardation (front > back), sell front-month strangles - premium is richest and will normalize as term structure flattens. In steep contango (back > front), consider selling the back month if IV rank is high there. Also watch for term structure roll-down - as time passes in contango, your options roll down to cheaper points on the curve, helping your position.

There's no universal answer - it depends on your risk tolerance and transaction costs. Common approaches: (1) Threshold-based: hedge when delta exceeds ±0.20 or ±0.30. (2) Time-based: hedge daily at market close. (3) Hybrid: combine both. More frequent hedging reduces directional risk but increases transaction costs. Backtest different frequencies for your situation.

Size based on portfolio vega and correlation. Calculate total portfolio vega - cap it so a 5-10% IV spike is survivable. For Singapore (high correlation), treat multiple strangles as one correlated position during stress. Example: if max acceptable vega loss is S$20,000 and each strangle has S$5,000 vega, limit to 4 strangles total regardless of underlying.

Convert when: (1) IV spikes and you want to lock in vega gains while capping further risk. (2) You're concerned about tail risk and want defined maximum loss. (3) Margin expansion is becoming an issue. The conversion (buying OTM wings) costs money but provides peace of mind. Consider it insurance. Do it before you need it, not during a crisis.

Well-managed short strangle portfolios can achieve Sharpe ratios of 0.5-1.0 over full market cycles. Returns are not normally distributed - high win rate with occasional large losses (negative skew). Sharpe alone doesn't capture the tail risk. Also track maximum drawdown, sortino ratio (downside deviation), and worst losing streak. Target Sharpe >0.7 with max drawdown <25%.