SEC Rule 606

Overview and Regulatory Purpose

The order routing decision — which venue a broker-dealer selects to send a customer's order for execution — is one of the most commercially consequential choices in the securities trading process, yet it is largely invisible to the customer whose interests the routing decision is supposed to serve. 

A broker-dealer that receives a retail market order to buy 100 shares of an NMS stock must decide within milliseconds where to send that order — to a national securities exchange's limit order book, to a wholesaler that internalises retail order flow as principal, to an alternative trading system, or to some combination of venues. Each of these routing choices has different implications for the customer's execution quality, and many of these choices are influenced by payment for order flow — payments that wholesalers and other market centres make to broker-dealers in exchange for order flow.

The conflict of interest that payment for order flow creates is direct and structural. A broker-dealer that receives payments from a wholesaler in exchange for routing customer orders to that wholesaler has a direct financial incentive to favour the wholesaler as an execution venue — regardless of whether the wholesaler consistently provides the best execution quality for those orders. Without disclosure of these arrangements and their influence on routing decisions, customers cannot assess whether their orders are being routed in their interests or in the broker-dealer's interests, cannot compare routing practices across broker-dealers, and cannot make informed choices about which broker to use for order execution.

Rule 606 addresses this transparency deficit by requiring comprehensive quarterly public disclosure of where broker-dealers route non-directed orders and the payment for order flow and profit-sharing arrangements that may influence those routing decisions, and by giving customers the right to obtain individualised reports showing exactly where their specific orders were routed.

Statutory Authority and Rulemaking History

Rule 606 derives its statutory authority from Section 11A of the Securities Exchange Act of 1934, which mandates the national market system and directs the Commission to facilitate the availability of information about quotations and transactions to brokers, dealers, and investors. 

The order routing disclosure rule originated as Rule 11Ac1-6 under the Exchange Act, adopted in November 2000, and was redesignated as Rule 606 when the Commission adopted Regulation NMS in 2005.

The November 2018 amendments — Securities Exchange Act Release No. 34-84528, published at 83 FR 58338, November 19, 2018 — were the most significant changes to Rule 606 since the rule's original adoption. 

Those amendments added: enhanced public quarterly reporting for held orders with more detailed disclosure of payment for order flow and profit-sharing arrangements; a new category of customer-specific reporting for not-held institutional orders; an enhanced requirement to disclose any terms of payment for order flow arrangements and profit-sharing relationships with specified venues; and a requirement to group held order disclosures by S&P 500 stocks and other NMS stocks rather than by listing market. 

The eCFR confirms November 19, 2018 as the date of the most recent formal amendment to Rule 606's operative text, with no subsequent changes through June 2026.

Key Provisions and Operative Requirements

Rule 606(a)(1) establishes the quarterly public reporting obligation. Every broker-dealer that routes customer orders in NMS stocks or NMS option securities must make publicly available for each calendar quarter a report on its routing of non-directed orders in NMS stocks submitted on a held basis and non-directed customer option orders during that quarter, broken down by calendar month. 

The report must include separate sections for NMS stocks — with further separation between S&P 500 Index constituents as of the first day of the quarter and other NMS stocks — and NMS option securities. The quarterly report must be posted on an internet website that is free and readily accessible to the public and must remain posted for three years from the initial posting date.

The content requirements for the Rule 606(a)(1) quarterly report encompass for each specified venue to which at least 5% of total non-directed orders were routed: the identity of the venue; the total shares of non-directed orders routed; the percentage of those shares that were directed and non-directed orders; the percentage that were market and marketable limit orders; the percentage that were non-marketable limit orders; the percentage that were other orders; the net payment received from — or net payment made to — the venue for the calendar quarter, including payment for order flow received and payment from profit-sharing relationships received, minus transaction fees paid and rebates received; and whether any payment for order flow was received and, if so, whether the terms of any such arrangement were uniform for all customers or differed among customers.

The requirement to disclose the net payment for order flow — expressed as net dollars and as cents per share — is among the most commercially significant provisions in Rule 606(a)(1). By requiring broker-dealers to publicly report the aggregate net payments they received from specific execution venues, the rule enables customers, regulators, academics, and the financial press to identify which broker-dealers receive the largest payments in exchange for routing customer order flow and to assess whether those payments are correlated with inferior execution quality. This financial disclosure has been the centrepiece of ongoing academic and regulatory debate about payment for order flow — the practice that several jurisdictions, including the United Kingdom and the European Union under MiFID II, have restricted or prohibited in their markets.

Rule 606(b)(1) establishes the customer-request reporting obligation. Upon request of a customer, every broker-dealer must provide that customer with a report on the routing of that customer's specific orders — covering held orders in NMS stocks, not-held orders in NMS stocks where the broker-dealer is not subject to the enhanced institutional reporting under Rule 606(b)(3), and option orders — for the six months prior to the request. The report must identify the venues to which each order was routed, whether the order was a directed or non-directed order, and the time of any resulting transactions. Broker-dealers must notify customers in writing at least annually of the availability of this individualised routing report upon request.

Rule 606(b)(3) establishes the enhanced institutional reporting requirement for not-held orders. A broker-dealer for which at least 5% of the total shares received from customers over the prior six calendar months consisted of not-held NMS stock orders must provide enhanced periodic reports to any customer that traded on average at least $1,000,000 of notional value of not-held NMS stock orders per month through the broker-dealer over the prior six months. These enhanced reports must be provided for each calendar month no later than the 15th day of the following month and must include substantially more detailed information about not-held order routing and execution — including the proportion of orders routed to various categories of venue, the average execution speed, the average size, and the net average execution fee or rebate received from each venue category. The institutional customer reporting requirement was the most significant addition of the 2018 amendments, recognising that the traditional quarterly aggregated disclosure was inadequate for the needs of institutional customers who route large not-held orders through complex broker-dealer order handling arrangements and need granular, timely information to assess the quality and conflicts embedded in those arrangements.

Scope of Application

Rule 606 applies to every broker-dealer that routes customer orders in NMS stocks and NMS option securities — a scope that encompasses virtually every registered broker-dealer with retail or institutional customers. The quarterly public reporting obligation under Rule 606(a)(1) applies to all broker-dealers routing customer held orders and option orders. The enhanced institutional reporting obligation under Rule 606(b)(3) applies to broker-dealers where at least 5% of total customer shares received consist of not-held orders and who have qualifying institutional customers.

Directed orders — orders that a customer has specifically instructed the broker-dealer to route to a particular venue — are excluded from the non-directed order reporting categories of Rule 606(a)(1), reflecting the Commission's determination that where the customer has made the venue selection decision, the broker-dealer's routing decision and the associated conflicts are not present. However, directed orders are included in the customer-specific reporting under Rule 606(b)(1) — the customer who directed a specific order has the right to receive confirmation of where that order was routed.

Relationship to Related Rules and Regulations

Rule 606's order routing disclosure framework is the transparency complement to Rule 605's order execution quality disclosure framework. Rule 605 requires market centres to publicly disclose statistical information about the execution quality of orders they receive — enabling assessment of how well venues execute once they receive orders. Rule 606 requires broker-dealers to disclose where they route orders and the financial arrangements influencing those routing decisions — enabling assessment of whether the routing choices themselves are made in customers' interests. Together Rules 605 and 606 constitute the complete order quality transparency framework of Regulation NMS.

Rule 606's payment for order flow disclosure directly addresses the conflict of interest that the receipt of payment for order flow creates in broker-dealers' routing decisions. This disclosure interacts with FINRA Rule 5310 — the best execution rule — which requires broker-dealers to use reasonable diligence to execute customer orders at the most favourable terms reasonably available under the circumstances. A broker-dealer that receives payment for order flow has an obligation under Rule 5310 to ensure that the receipt of those payments does not cause it to compromise its best execution obligation, and Rule 606's disclosure enables customers to scrutinise whether that obligation is being met.

Amendment History and Regulatory Evolution

Rule 606's operative framework has been governed by the November 2018 amendments since their adoption, which substantially expanded the rule's scope and disclosure content beyond the pre-2018 quarterly public reporting framework. The 2018 amendments responded to significant changes in market structure since the original rule's adoption in 2000 — the growth of payment for order flow as a dominant commercial arrangement between retail broker-dealers and wholesale market makers, the proliferation of not-held institutional order routing through complex algorithmic and agency broker arrangements, and the Commission's determination that the pre-amendment disclosure was insufficient to enable customers and the public to meaningfully assess broker-dealer order routing practices.

The broader regulatory debate about payment for order flow has intensified significantly since the 2018 amendments, driven by the meme stock trading events of early 2021, the significant academic literature documenting the relationship between payment for order flow and retail execution quality, and the regulatory actions taken by European and United Kingdom authorities to restrict or prohibit payment for order flow in their markets. The Commission's December 2022 equity market structure proposals included a contemplated but not adopted best execution rulemaking that would have directly addressed payment for order flow — though that proposal did not proceed to a final rule. No formal rulemaking proposing amendments to Rule 606 had been published through June 2026.

Enforcement Context and SEC Action Patterns

Rule 606 enforcement has concentrated on two categories of violation. The first involves failures to file timely quarterly public reports — broker-dealers that did not post their Rule 606(a)(1) quarterly reports within the one-month window following the quarter end or that posted reports on websites not freely accessible to the public. FINRA's examination programme monitors member broker-dealer compliance with Rule 606(a)(1) reporting obligations and has identified timely filing and accessibility failures as recurring findings.

The second enforcement category involves material inaccuracies in Rule 606 reports — including incorrect identification of routing venues, inaccurate disclosure of payment for order flow amounts, and failure to disclose the existence or terms of payment for order flow and profit-sharing arrangements with specified venues. The Commission has treated Rule 606 accuracy obligations as independently enforced requirements rather than aspirational disclosure standards, and has brought enforcement actions against broker-dealers whose public order routing disclosures materially misrepresented the payments they received or the routing practices they employed.

Examination Relevance and Key Takeaways

Rule 606 is examined at the Series 7 and Series 65 levels in the context of order handling obligations, payment for order flow, and the transparency requirements applicable to broker-dealers routing customer orders. The distinction between held and not-held orders — held orders requiring immediate execution attempts, not-held orders providing the broker-dealer with price and time discretion — is a fundamental examination concept because it determines which reporting regime applies under Rule 606. The quarterly public report requirement under Rule 606(a)(1) and the customer-specific request report under Rule 606(b)(1) are both consistently examined as the primary disclosure mechanisms.

Payment for order flow — the practice of receiving payment from execution venues in exchange for routing customer order flow — and its required disclosure under Rule 606(a)(1) is a concept examined in the context of conflicts of interest in order handling and the best execution obligation.

The key points to retain are these. Rule 606 requires every broker-dealer routing customer orders in NMS stocks and NMS option securities to publish quarterly public reports disclosing where non-directed held orders were routed, the payment for order flow and profit-sharing arrangements associated with routing to specific venues, and any terms of those arrangements that may influence routing decisions. Reports must be posted on a free, publicly accessible website and retained for three years. Upon customer request, broker-dealers must provide individualised routing reports for the prior six months covering held orders, qualifying not-held orders, and option orders. Broker-dealers with significant not-held order flow must provide enhanced monthly institutional reports to qualifying institutional customers. Directed orders are excluded from public quarterly reporting but included in customer-specific reporting. Rule 606 was last formally amended November 19, 2018 and no formal amendments have been proposed through June 2026.