Order Protection

Quick Answer

A trade-through is buying or selling an NMS stock during regular trading hours, as principal or agent, below a protected bid or above a protected offer. A trading center must establish, maintain and enforce written policies and procedures reasonably designed to prevent trade-throughs on that center absent an exception, and, if relying on one, to assure compliance with its terms.

The order protection rule is the reason a displayed price on one venue constrains what another venue may print. It does not force any single execution. It forces a venue to have procedures, and then to check that they work.

Note who is bound before anything else. The duty sits on the trading center, not on the trader who entered the order, not on the customer, and not on a routing broker in that capacity.


What Counts as a Trade-Through?

A trade-through is the purchase or sale of a national market system (NMS) stock during regular trading hours, either as principal or agent, at a price that is lower than a protected bid or higher than a protected offer.

Three limits are built into that sentence:

  • It runs on an NMS stock, so a listed option cannot produce a trade-through
  • It runs during regular trading hours, so a print before the open or after the close is not one
  • It measures against a protected quotation, so a print through a quotation that fails the protection test is not one either

Exam Tip: Gotchas

  • A print outside regular trading hours is not a trade-through at all. The definition carries the hours limit inside itself, so nothing separate has to excuse an after-hours print through a displayed price.
  • Trading through a manual quotation is not a trade-through. A protected quotation must be an automated quotation, so a venue quoting manually has taken its price out of the calculation while that flag is up.
  • Agency and principal are both covered. The definition names a purchase or sale effected either as principal or as agent, so acting for a customer does not put an execution outside it.

What Does the Order Protection Rule Require, and of Whom?

A trading center must establish, maintain and enforce written policies and procedures that are reasonably designed to prevent trade-throughs on that trading center of protected quotations in NMS stocks that do not fall within one of the rule's exceptions.

The same sentence carries a second limb. Where the trading center relies on an exception, its policies and procedures must also be reasonably designed to assure compliance with the terms of that exception.

So the operative obligation is the procedures themselves, and the standard applied to them is "reasonably designed" rather than a guarantee of a result.

Exam Tip: Gotchas

  • The rule is a policies-and-procedures rule, not a per-trade prohibition. A single trade-through is evidence about the procedures; the violation the rule describes is failing to establish, maintain and enforce reasonably designed ones.
  • Relying on an exception creates a second duty rather than removing the first. The trading center still needs procedures, and those procedures must be reasonably designed to assure compliance with the exception's own terms.
  • The duty is limited to that trading center's own executions. The wording reaches trade-throughs on that trading center, so one venue is not made responsible for policing what another venue prints.

What Must a Trading Center Do After It Writes the Procedures?

Two further obligations run continuously:

  • Regularly surveil to ascertain the effectiveness of those policies and procedures
  • Take prompt action to remedy deficiencies in those policies and procedures

The surveillance duty is stated as regular, and the remediation duty as prompt. Neither is tied to a fixed interval or a stated number of days.

Exam Tip: Gotchas

  • Surveillance is a standing obligation, not an occasional review. The rule requires regular surveillance to ascertain effectiveness, so a venue that wrote good procedures once and never tested them has missed a separate requirement.
  • Remediation attaches to the procedures rather than to a trade. Prompt action is owed to fix deficiencies in the policies and procedures themselves, so correcting an individual execution does not discharge it.

Can the Commission Lift the Order Protection Rule?

The Commission may, by order, exempt from the order protection rule, either unconditionally or on specified terms and conditions, any person, security, transaction, quotation, or order, or any class or classes of persons, securities, quotations, or orders.

Exam Tip: Gotchas

  • An exception and an exemption reach the rule from different directions. A trade-through inside one of the listed exceptions sits outside the prevention duty on the rule's own terms, with nobody granting anything, though the center's procedures must still assure compliance with that exception's terms; an exemption exists only where the Commission grants it.

What Is Not the Order Protection Rule?

The order protection rule protects a quoted price. It is a narrow duty, and the exam rewards keeping it apart from two neighbors that look similar.

  • Using reasonable diligence to ascertain the best market, so the customer's price is as favorable as possible under prevailing market conditions, belongs to the best execution rule, covered in the unit on meeting obligations to customers regarding orders.
  • Fees for reaching a protected quotation, and the duty to avoid locking or crossing one, belong to the access rule, covered in the unit on disseminating quotes and trade advertisements.

Exam Tip: Gotchas

  • Respecting a protected quotation is not the same as getting best execution. A venue can satisfy the order protection rule on a trade and still leave a best execution question open, because the two duties have different bearers and different tests.
  • Locking a market is not a trade-through. A trade-through needs a purchase or sale at a price through the protected quotation; posting a quotation that locks or crosses one is the access rule's subject instead.

What Should You Check on Exam Day?

  • Confirm the print happened during regular trading hours and in an NMS stock before calling anything a trade-through.
  • Check that the quotation traded through was protected, meaning displayed by an automated trading center, disseminated under an effective plan, and an automated quotation that is the best bid or offer of an exchange or association.
  • Put the policies-and-procedures duty on the trading center, never on the trader, the customer, or a broker acting only as a router in that capacity; a router of an intermarket sweep order carries its own reasonable-steps duty.
  • Look for both limbs: procedures reasonably designed to prevent trade-throughs, and, where an exception is relied on, procedures assuring compliance with its terms.
  • Separate the two relief routes: a listed exception applies by itself, while an exemption requires a Commission order.