Order protection rule

Order protection rule

A provision of the National Market System that forces trading centers to quote equivalent and consistent execution prices for a security on all exchanges that allow trading of that security. Also known as Rule 611 after its designation in the Federal Register, the Order Protection Rule is designed to prevent trade-throughs, or trades executed at prices other than the best-quoted price for that security. Rule 611 applies to all stocks on major indices and most over-the-counter stocks.
Copyright © 2012, Campbell R. Harvey. All Rights Reserved.

Order Protection Rule

A rule requiring investors to receive a price for a security that is at least equivalent to the price for the same security on another exchange. That is, the order protection rule forbids an order from being executed at a price below the price on another exchange. There are various exceptions; notably limit orders and IOC orders do not necessarily abide by the order protection rule. The rule is a provision of Regulation NMS and is designed to help integrate American exchanges and to protect investors from bad deals. It is also called Rule 611.
Farlex Financial Dictionary. © 2012 Farlex, Inc. All Rights Reserved

Order protection rule.

The order protection rule, part of Regulation NMS -- for National Market System -- adopted by the Securities and Exchange Commission (SEC) in 2005, requires that every stock trading center establish and enforce a policy that ensures no transaction will be traded-through, or executed at a price that's lower than a protected quotation in that security displayed by another trading center.

A protected quotation is one that's immediately and automatically accessible. The order protection rule, also called Rule 611, does allow certain exceptions, which apply to limit orders, immediate-or-cancel (IOC) orders, and intermarket sweep orders (ISOs).

Dictionary of Financial Terms. Copyright © 2008 Lightbulb Press, Inc. All Rights Reserved.
References in periodicals archive ?
A key differentiator between the newly approved IEX and other national securities exchanges such as the New York Stock Exchange, Nasdaq Stock Market and Bats BZX Exchange was blessed by the SEC in its revised interpretation of the order protection rule. The commission said it would "require trading centers to honor automated securities prices that are subject to a small delay or speed bump when being accessed." IEX's so-called speed bump of 350 microseconds is within the 1 millisecond now allowed by the SEC.
The Order Protection Rule generally requires that trading centers trade at the best-quoted prices or route orders to the trading centers quoting the best prices.
Specifically, we use data from US equity markets in 2008 to investigate the US Securities and Exchange Commission's (SEC) "Flickering Quote Exception" to the Regulation National Market System (Reg NMS) Order Protection Rule that defines the benchmark price for evaluation of trade throughs and provides a one second look back exception.
Section I provides an overview of the SEC Reg NMS Order Protection Rule and the Benchmark Quote Exception and describes the quote-arbitrage trading strategy.
Reg NMS Order Protection Rule and Flickering Quote Exception
To better integrate the various exchanges trading equities and to encourage the display of liquidity, the SEC adopted the Order Protection Rule, Rule 611, in 2005.
The Order Protection Rule and the Benchmark Quote Exception establish the regulatory environment that forms the basis of our analysis.
One potential cause of our current and proceeding results is that the Order Protection Rule is simply ignored by the exchanges.
The SEC's Benchmark Quote Exception to the Order Protection Rule allows trades on an exchange to occur at prices inferior to the best contemporaneous prices on other exchanges as long as the trade occurs at a price equal to or better than the Benchmark Quote.