Trading Rotation is a current federal securities-regulation defined term. This guide preserves the rule-specific definition and boundaries instead of replacing it with informal market shorthand.
ReviewedEvidence1 sourceSectionPhrases & Idioms
Quick answer
A trading rotation is the options-class period around opening, reopening, or closing before continuous trading has fully begun or ended for the day.
Key details
Canonical FormTrading Rotation
Core MeaningUnder 17 CFR § 242.600, a trading rotation is the period for an options class when opening, reopening, or closing transactions are not yet completed and continuous trading has not yet begun or has not yet ended for the day.
Further guidance
History Boundary
This page reflects the current reviewed federal regulation text and should be rechecked if the incorporated Regulation NMS or Regulation ATS definition changes.
Meaning
Under 17 CFR § 242.600, a trading rotation is the period for an options class when opening, reopening, or closing transactions are not yet completed and continuous trading has not yet begun or has not yet ended for the day.
Usage Boundary
The Regulation NMS definition is specific to an options class and the transition into or out of continuous trading; it is not a generic term for any rotation among securities.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
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Under current U.S. Regulation NMS, an “automated trading center” is a trading center with systems, procedures, and rules capable of displaying automated quotations, identifying non-automated quotations as manual, and applying reasonable standards for changes between automated and manual status. This is a condensed rule-scoped explanation of 17 CFR § 242.600; the full definition contains multiple operational conditions and should be consulted for compliance work.
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