What Time Do Options Start Trading?
What time do options start trading? US listed options open at 9:30 a.m. ET. Here is the 7:30 a.m. order acceptance window and the overnight index session.
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Why Are Spreads Wider at the Open? Real Data
Why are spreads wider at the open? Tick-level quotes price the opening premium half hour by half hour, show how fast it fades, and what premarket really costs.