Regulation NMS

Regulation NMS

Definition

Rules adopted by the Securities and Exchange Commission in 2005 to enhance and modernize the national market system. Regulation NMS reorganized the existing rules promulgated pursuant to § 11A of the Securities Exchange Act of 1934 (Rules 600–609) and added the access-to-quotations rule (Rule 610), the order-protection rule (Rule 611), and the sub-penny rule (Rule 612).

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