I can (and did) sell 2 March puts (about 100 days to expiry) at a strike price of 82 cents. I received $640 for this sale, and it required $1200 margin. This means I will make about 50% in 100 days on this trade if the CAD/USD exchange rate stays over 82 cents.
Now, I also think the CAD price will be kept in check and will not skyrocket to $1.10 in a short period of time. With the US dollar so beaten down, there may even be a short-term US dollar rally here. I am able to sell 2 March calls at a strike price of $1.06 for a $560 premium. By itself, this trade would normally require around $1100 margin. So we can guess our total return and margin requirements are as follows:
Trade Premium Margin
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Sell 2 0.82 March Puts $640 $1200
Sell 2 1.06 March Calls $560 $1100
Total: $1100 $2300
$1100/$2300 = 48% ROI.
$1100/$2300 = 48% ROI.
However, this is not what really happens. In futures trading, margin requirements are calculated using a special algorithm called SPAN margin. The algorithm is a secret (you have to pay $1000 or something to even buy a program that will calculate it for you, although your broker has the program and will calculate it for you). All you need to know is that it calculates a 1-day risk value on your entire portfolio covering 16 different scenarios.
If you look at our trade above and really think about it, we didn't add much risk by adding the 2nd trade. If the CAD moves significantly in one direction, the losses in the one option will be partially, if not mostly, covered by the gains in the other option. E.g. if the CAD goes to 98 cents, the 1.06 calls may double in value (+$560), but the puts will then also drop to maybe $200 (-$440), so we've effectively hedged our position pretty well. The SPAN calculation recognizes this since it analyzes our whole portfolio, and thus only requires an extra $500 margin for adding the 2nd trade instead of a full $1100 if the trade were by itself.
With SPAN margin, our trade actually looks like this:
Trade Premium Margin
----------------------------------------------
Sell 2 0.82 March Puts $640 $1200
Sell 2 1.06 March Calls $560 $500
Total: $1100 $1700
$1100/$1700 = 65% ROI.
$1100/$1700 = 65% ROI.
A trade like this where you both sell a put and sell a call in the same expiration month is known as a Short Option Strangle, which I'll just call a Strangle from here on (because we're always "short" by being sellers of options).
I love strangles because you simultaneously increase your ROI while lowering your risk, which is totally counterintuitive -- normally to increase your ROI you have to take on more risk.
You could argue that you are taking on some more risk with a strangle, because a major market move in either direction is now bad for you, whereas with a single position, the market has to move in a specific direction to affect you negatively. However, I believe this type of risk is more than offset by the hedging nature of the trade.
In fact, if you follow a strict rule of exiting both trades and repositioning the strangle if one of the option's value doubles, you almost can't lose money. As I described earlier, if the CAD moved up to 0.98 and the call option doubled, you could probably exit the trade for less than a $200 loss. You could then place a new strangle at a higher price range, say 86 cents and $1.10, again for a total $1100 premium. Even if you had to reposition your trades like this 5 times until you were finally successful, you'd still break even in the end!
I try to do strangles whenever it makes sense. However, when the sentiment on a commodity is really bullish or bearish, it can be too difficult to do a low risk strangle. Right now, many commodities have a lot of bullish sentiment, and so the puts are practically worthless until you get to the strikes that are quite close to the current price -- too close for our comfort as far out-of-the-money option sellers.
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