What does NMS mean in finance?
National Market System
The National Market System (NMS) promotes free market transparency by regulating how all major exchanges disclose and execute trades. It is the system for equity trading and order fulfillment in the U.S. that consists of trading, clearing, depository, and quote distribution functions.
How many Reg NMS securities are there?
There are 14 separate “rules” that makeup Reg NMS (see Table 1 below), which are grouped into six main categories with some common themes: Definitions: Rule 600 defines concepts and terms, which is sometimes pivotal to how the later rules work.
What is a non NMS security?

OTCBB. You might have heard of stocks trading on the over-the-counter bulletin board (OTCBB). This means the security isn’t traded on a national securities exchange (non-NMS securities) but it does quote on the Financial Industry Regulatory Authority’s (FINRA) interdealer quotation service.
What does Nasdaq NMS mean?
National Market System (NMS) Refers to over-the-counter trading. System of trading OTC stocks under the sponsorship of the NASD. Must meet certain criteria for size, profitability and trading activity.
What are NMS securities?
In general, the term “NMS Security” refers to exchange-listed equity securities and standardized options, but does not include exchange-listed debt securities, securities futures, or open-end mutual funds, which are not currently reported pursuant to an effective transaction reporting plan.
What is NMS equity?

The National Market System (NMS) is the national system for trading equities in the United States. The System includes all the facilities and entities which are used by broker-dealers to fulfill trade orders for securities. This includes: Major stock exchanges, such as New York Stock Exchange and Nasdaq.
What is Reg Sci?
Regulation Systems Compliance and Integrity (Regulation SCI) is a set of rules created by the United States Securities and Exchange Commission to monitor the security and capabilities of U.S. securities markets’ technological infrastructure.
Are ETFS NMS securities?
NMS, the national system for trading stocks in the United States, includes all of the major stock exchanges and other facilities and entities used by broker-dealers to fulfill trade orders for securities, including ETF shares.
Who does Reg Sci apply to?
Regulation SCI applies to “SCI entities,” a term which includes self-regulatory organizations (“SROs”), including stock and options exchanges, registered clearing agencies, FINRA and the MSRB, alternative trading systems (“ATSs”), that trade NMS and non-NMS stocks exceeding specified volume thresholds, disseminators of …
What is Regulation ATS?
Key Takeaways. Alternative trading systems (ATS) are venues for matching large buy and sell transactions. They are not as highly regulated as exchanges. Examples of ATS include dark pools and ECNs. SEC Regulation ATS establishes a regulatory framework for these trading venues.
What is regulation ATS?
What does Reg Sci mean?
Regulation Systems Compliance and Integrity
Regulation Systems Compliance and Integrity (Regulation SCI) is a set of rules created by the United States Securities and Exchange Commission to monitor the security and capabilities of U.S. securities markets’ technological infrastructure.
What does Regulation NMS mean for the stock market?
In addition to redesignating the national market system rules previously adopted under Section 11A of the Securities Exchange Act of 1934 (“Exchange Act”), Regulation NMS includes new substantive rules that are designed to modernize and strengthen the regulatory structure of the U.S. equity markets.
What is Reg NMS and how does it work?
The Securities and Exchange Commission (SEC) saw a need to strengthen the NMS and account for changing technology. In 2005, they issued the Regulation National Market System (Reg NMS), which contains four main components. The Order Protection Rule aims to guarantee investors get the best price at the execution of their order.
When did the SEC adopt Regulation NMS?
On June 9, 2005 the Securities and Exchange Commission (SEC) issued its release adopting Regulation NMS. Regulation NMS established substantive rules designed to modernize and strengthen the regulatory structure of the United States equities market. View SEC’s spotlight on Regulation NMS.
What is an NMS security?
Specifically, Regulation NMS defines an “NMS security” as “any security or class of securities for which transaction reports are collected, processed, and made available pursuant to an effective transaction reporting plan, or an effective national market system plan for reporting transactions in listed options.” [ 665]