Why Option Prices and Margin Data Are Needed for Short Straddle Returns

Summary

The document asks how to calculate daily returns for a short straddle from an options dataset containing dates, maturities, strikes, call or put labels, moneyness, implied volatility, and delta. The response identifies a key data gap: these fields do not include option prices, which are required to calculate the position’s profit or return over time. A short straddle requires opening and closing values for both the call and put legs, with a clearly defined return denominator.

The response also notes that short positions and spreads have margin requirements that depend on the traded product and the broker’s risk policy. Consequently, a return measure based only on option values may differ from a return on posted capital. The snippet does not provide prices, contract multipliers, transaction costs, or margin rules, so it cannot support a specific return calculation; the data fields shown are insufficient to resolve those choices.

Key ideas

• Implied volatility and delta do not substitute for option prices when calculating realized returns.
• A short straddle combines short call and put positions, so both legs need valuation over the holding period.
• Returns depend on the chosen capital denominator and may account for margin posted.
• Margin requirements vary with the product and the broker’s risk policy.

Tags

# straddle return


# straddle return












I have the following options data. This is just a snippet but this data is available every day Period 30 to 720 and Out of the Money : 0 to 60 in increments of 5 I would like to compute short straddle return for each day. Its been a while since I used options and was wondering if someone could guide me

```
    ID  Symbol  TradeDate Period Strike_Price     Call_Put  Out_of_the_Money    IV  Delta
    2631442 A   17-Jul-17   30  12591.56            P        0             0.10793-0.49383
    2631443 A   17-Jul-17   30  12591.56            C        0             0.10738 0.50614
    2629567 A   14-Jul-17   30  12616.31            P        0             0.10864-0.49379
    2629568 A   14-Jul-17   30  12616.31            C        0             0.1074  0.50614
```

## Answer by onlyvix.blogspot.com (score 1)

https://quant.stackexchange.com/a/35273

For starters, to calculate returns you need prices, which I don't see in your data. Second, while long options positions are trivial to calculate, short positions and spreads require margin deposit that depends on the product you trade, and your broker's risk policy.

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