Spx calendar AM-PM

I was playing around the SPX chain, I normally ignore the AM expiries, but I noticed that the AM expiring tomorrow look slightly more expensive than tomorrow PM expiry.

Is there anything I am missing here?

There normally is when I spot these obvious opportunities.

 

Ops....do they expire Friday morning although showing tomorrow Thursday 14th date?
That would explain it

 

well I am waiting for bill gross to say buy bonds and mike wilson to say buy stocks, until then, just coasting without efforts.

 

Some brokers (Interactive Brokers) will list the last trading day. So even though they expire Sept 15 AM, Sept 14th is listed (as this is the last day to trade)

This has caused a lot of confusion with some traders on IB.

 

it caused IB to lose a 20mm lawsuit against a prop firm in NJ over vix settlement dates

 

IBKR's approach also tricked me twice, glad tohear that i'm not alone

 

How does this work? Why would a big prop firm even want to bother with IB?

 

IB has some serious customers. Proper hedgefunds clear and trade through IB.

I take it back. IB paid 1.7MM in the lawsuit. The trader lost 20MM

https://nypost.com/2015/04/12/incorrect-date-costs-broker-nearly-23m-in-liabilities/