I think your worst case scenario is that the market drifts down to around 1690.01 at the 46 day mark, never hitting your criteria to buy back the spread in the interim. It will cost you more than $10 to buy back the 1700 position at that point since it's not so ITM that it's trading at intrinsic. For example right now it looks like a put that is 10 points ITM and 15 days from expiration is trading at around $25, not $10.xx. Obviously the 1690 expires worthless. Not an unlimited loss, but closer to $2,500-$150 instead of the $1,000-$150 you're thinking. The real loss comes when you don't take the loss right then, and try to hold that naked 1700 short put!Thanks FSU.
Thanks for defining the types of positions I have been placing:
Short Vertical PUT Time Spread
So, what is my risk then? in this position?
Sell 1700 SPX Puts (60 days out)
Buy 1690 SPX Puts (46 days
If tomorrow the Market dropped to 1200, I would be down 1k per spread minus the $150 bucks I collected per spread.
In another scenario, If the market dropped slowly over the next lets say 40 Days, and was at 1750. My loss would be potentially much more significant. 1700 Puts could be selling for 30 bucks, where the 1690 puts with 6 days until expiration might only be at 10, potentially giving me a roughly negative $2000/contract which is much larger than your typical vertical credit spread.
Would the options experts confirm that the above would roughly be the worst case scenario?
My read of the literature is that this strategy has a lower risk adjusted return than you probably think. There is a well-known phenomenon of OTM S&P puts costing more than they should based on realized volatility, one of the few cases where options are provably systematically mispriced. The ATM puts obviously are subject to put-call parity. So, at least when you're close to the current trading price, a strategy of selling the fairly priced put with the higher strike and buying the inflated further out of the money put would be suboptimal. I'm not sure what the research says as you go far out of the money, might be worth looking into if you're going to continue to pursue.
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