Comment by fractorial
3 hours ago
SPY is an ETF and SPX is an index. The distinction is material.
/ES does not trade between 5pm and 6pm ET. SPX options aren't marked until 8:15 PM ET.
It's more plausible that large caps see MWF, then MTWHF possibly.
Good additional info. I used a shortcut I figured most people would understand without getting into the weeds.
you get off on using acronyms few people in your professional circle understand?