SPX AM settlement risk

How does am settlement work on SPX? I was short some SPX puts on Friday that closed just OTM. I now have no position and my margin requirement has gone according to IB account window. Do I still have risk until the open on Monday?

I usually trade ES which have PM settlement and position goes to zero at 9pm.
 
How does am settlement work on SPX? I was short some SPX puts on Friday that closed just OTM. I now have no position and my margin requirement has gone according to IB account window. Do I still have risk until the open on Monday?

I usually trade ES which have PM settlement and position goes to zero at 9pm.

I thought weeklies settle PM.
 
Majority of SPX expirations are PM settled based on final closing price on SPX. The AM options are the exception with those expirations being the 3rd Friday of the month; there is also a PM expiration same day. The AM options settle based on the official rate (ticker: SET), which is now published daily about ~30 minutes after market opens. All SPX options are cash settled.
 
Majority of SPX expirations are PM settled based on final closing price on SPX. The AM options are the exception with those expirations being the 3rd Friday of the month; there is also a PM expiration same day. The AM options settle based on the official rate (ticker: SET), which is now published daily about ~30 minutes after market opens. All SPX options are cash settled.

except that i bet volume weighted the AM's are bigger than the PM's by an order of magnitude.
 
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