Midday market on OpEx 11/18: Tech pulls index back again

Market opened the November OpEx trading session quite stable in the morning with theta having major impact on put volume piled into market over past 2 days and long-term call positions at 400/4000~SPY/SPX with total over $2.1 trillion notional value of options expiring today.

Most of the above options volume concentrated at gamma pin 400 at both ends:

However, morning roll hedge activity immediately pulled tech and overall index down, though with not too large fluctuation range as most hedges rolled to December OpEx instead of next week. This makes next month's OpEx the largest in 10 years for SPX with over $3.3 trillion notional expiring, influenced by largest put volume in 2 years and frantic call buying pressure after CPI report.