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.

Thanks.

T+0 all-year-round trading is good in many ways bad in others —like losing the real investor liquidity spawning window at 09:30 EST as opposed to pure market making.

Quarterly earnings were already a bad fit for many businesses so I agree with the measure to do away with them in principle. Someone proposed real-time and I think that would be a net positive if not very feasible. Yearly is a good compromise.

Companies that are not profitable YoY usually have a story so they probably can avoid having to rob Peter to pay Paul.

Then again, maybe everyone adapts and yearlies turn into the next quarterlies.

Good additional info. I used a shortcut I figured most people would understand without getting into the weeds.

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