Glossary Detail: Extended Hours
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Backtesting Extended Hours on High-Beta Names
Trading outside regular market hours (9:30 AM - 4 PM ET). Pre-market runs 4-9:30 AM; after-hours runs 4-8 PM.
Further Details:
Extended hours trading occurs outside the regular market session (9:30 AM - 4:00 PM ET). Pre-market trading runs from 4:00 AM to 9:30 AM ET, and after-hours trading runs from 4:00 PM to 8:00 PM ET. Volume is typically much lower and spreads are wider during extended hours.