I think the OP wanted to know how is it possible to lose more than you put in. I think this is how the recent blowup went down:
- Pro thinks asset will never hit price $Y, and sells deep naked OTM calls with a strike of $Y, he hedges 12 of these with 1 purchase of the actual asset at the current price of $X
- Oops, asset hits price $Y+$Z, everone who bought his deep naked OTM calls wants to exercise at price $Y
- Pro has to buy at $Y+$Z and sell at $Y, meaning he loses $Z
- Since the original trade was leveraged, you lose $Z x some factor, which can be greater than your account balance. You then owe this to the clearing house because that's how faith in the market remains. Or something like that.
I do not claim to be correct, this is just my understanding. Happy to be shown where I'm wrong.
Edit: NVM, just wanted to know why the clients are on the hook and not the pro.
- Pro thinks asset will never hit price $Y, and sells deep naked OTM calls with a strike of $Y, he hedges 12 of these with 1 purchase of the actual asset at the current price of $X
- Oops, asset hits price $Y+$Z, everone who bought his deep naked OTM calls wants to exercise at price $Y
- Pro has to buy at $Y+$Z and sell at $Y, meaning he loses $Z
- Since the original trade was leveraged, you lose $Z x some factor, which can be greater than your account balance. You then owe this to the clearing house because that's how faith in the market remains. Or something like that.
I do not claim to be correct, this is just my understanding. Happy to be shown where I'm wrong.
Edit: NVM, just wanted to know why the clients are on the hook and not the pro.
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Happy T-day Mr. Morse!