SEC Rule 605 Execution Quality Reports, Explained

SEC Rule 605 execution quality reportsare the monthly statistical filings that tell you how well a broker or trading venue actually fills your stock orders — not the price you saw on your screen, but the price you got. The rule has existed since 2000. What changed is that, starting August 1, 2026, roughly 85 broker-dealers that together handle over 98% of customer accounts in the U.S. — a group that newly includes household names like Fidelity, Charles Schwab, Robinhood, and Interactive Brokers — became required to publish these reports for the first time, using metrics that were substantially rewritten in 2024.

Most coverage of Rule 605 and its companion, Rule 606, is written for compliance officers, not readers. This is a field guide for the rest of us: what the reports actually measure, why a rule that sat almost untouched for 24 years suddenly matters, and what a May 2026 congressional hearing revealed about where this goes next. No advice on which broker to use — just the plumbing.

Why a 25-Year-Old Rule Is Suddenly Relevant Again

The SEC first adopted Rule 605 in November 2000 — originally numbered Rule 11Ac1-5 — to improve public disclosure of order execution practices. For most of the two decades that followed, it was a rule compliance departments filed and almost nobody else read. That changed on August 1, 2026, when a delayed compliance date finally arrived, requiring the roughly 85 broker-dealers that clear the rule’s new customer-account threshold to start publishing modernized monthly reports.

The timing lines up with a broader push in Washington to look at how retail orders actually move. On May 20, 2026, the House Financial Services Subcommittee on Capital Markets held a hearing titled “From Order to Execution: Ensuring Efficient and Transparent Equity Markets”, with witnesses spanning academia, exchanges, and trading-venue operators. The plumbing that decides what price your order actually fills at is getting more scrutiny in 2026 than it has in years, and Rule 605 is the primary dataset that scrutiny runs on.

What SEC Rule 605 Execution Quality Reports Actually Require

Strip away the jargon and Rule 605 does one thing: it forces certain entities to publish monthly, standardized execution statistics. Two definitions do the heavy lifting.

A covered order, per the SEC’s own FAQ on the rule, includes market orders, limit orders, and certain non-marketable limit orders received during regular trading hours — and it counts as covered even if never filled. A market center is any of five entity types: exchange market makers, OTC market makers, alternative trading systems, national securities exchanges, and national securities associations. A firm operating in more than one capacity has to report separately for each.

Certain order types — fill-or-kill, average-price, directed orders, and a few others — are carved out entirely because they don’t fit the standardized comparison the rule is built around. Everything else gets sorted, measured, and published on a monthly cycle.

From 2000 to 2026: Why It Finally Got Modernized

SEC Commissioner Caroline A. Crenshaw put the core problem plainly the day the amendments were adopted: the content of Rule 605’s required disclosures “has not been substantively updated since the year 2000, despite changes in the speed and nature of trading.” Markets that once measured execution in seconds now measure it in fractions of a millisecond, and a reporting framework built for the dial-up era simply hadn’t kept up.

The SEC adopted the fix on March 6, 2024, under Release No. 34-99679, and Sidley Austin’s summary of the release lays out what changed: reporting entities must now disclose average execution time in increments of a millisecond or finer, plus realized-spread statistics calculated at five intervals after execution — 50 milliseconds, 1 second, 15 seconds, 1 minute, and 5 minutes. Crenshaw noted the amendments also require human-readable summary reports, in addition to the more detailed machine-readable reports, specifically so ordinary investors and analysts stand a chance of using the data, not just engineers who can parse XML.

The compliance date didn’t follow immediately. The rule was published in the Federal Register on April 15, 2024, and the SEC’s own rule page confirms it later extended the compliance date from December 14, 2025 to August 1, 2026 under Release No. 34-104147, giving market centers, brokers, and dealers extra time to build the systems needed to actually collect and publish this data.

Why Your Broker Is in Scope for the First Time

The old version of Rule 605 mostly captured market centers — exchanges and market makers — not the retail brokerage sitting between you and them. The 2024 amendments changed that by adding a 100,000-customer-account threshold: any broker-dealer that introduces or carries 100,000 or more customer accounts trading NMS stocks must now prepare its own separate Rule 605 report for its broker-dealer function, on top of anything it already reports as a market maker.

According to the SEC’s own analysis, cited in Sidley’s summary, approximately 85 broker-dealers meet that threshold — and together they handle more than 98% of customer accounts industry-wide. That is effectively every large retail brokerage in the country, reporting on itself for the first time in a format designed to be compared, broker to broker, rather than filed and forgotten.

How to Actually Read a Rule 605 Report

Open a Rule 605 report and three metrics matter more than the rest.

Context helps here. In prepared testimony for the May 2026 House hearing, Notre Dame finance professor Robert Battalio — who has studied U.S. order execution for over thirty years — noted that a recent academic study found the median marketable retail order executed in seven microseconds, with 83% of trades filling within the quote investors saw when they placed the order. Rule 605’s millisecond-level reporting is coarser than that, but it’s the first time speed data like this has been standardized across dozens of brokers at once.

You don’t need to build these reports yourself. FINRA hosts a central Rule 605 and 606 reports page, and brokers publish their own — Fidelity, for instance, frames the amended regime as giving investors more comparable, standardized data to evaluate execution quality across brokers, directly on its own site.

Rule 606 and the Payment-for-Order-Flow Connection

Rule 605 tells you how well an order was filled. Rule 606 tells you where it was sent in the first place — and that’s where payment for order flow enters the picture. Rule 605 and Rule 606 were originally adopted together on November 17, 2000, with Rule 606 substantially revised on November 2, 2018. Under the current version, broker-dealers that route customer equity and options orders must publish quarterly reports, broken down by calendar month, showing where non-directed customer orders actually went. Any individual customer can also request, free of charge, routing detail on their own orders covering the prior six months, and published reports have to stay public for three years.

Most retail brokers don’t execute your order themselves. They route it to a wholesale market maker — firms like Citadel Securities and IMC — which pays the broker for that order flow and, in exchange, promises to fill it at or better than the quoted price. A 2025 analysis of regulatory filings covering this activity found market makers paying more than $4.9 billion a year for U.S. equity and options order flow, with Citadel Securities and IMC as the largest payers — a real part of why commission-free trading exists. Rule 606 shows which wholesaler your broker sends orders to; it doesn’t show the dollar terms of that relationship.

The Disclosure Gap These Rules Still Don’t Close

None of this is a complete picture. In a 2023 piece for the University of Chicago Business Law Review, Joshua Nathanson argued that while brokers must disclose aggregate execution quality under Rules 605 and 606, they are not required to reveal the specific tradeoffs they negotiate with individual wholesalers. Rule 606 shows only the percentage of order flow routed to each venue — not the execution quality that venue delivered, or why the broker chose it. And at the time Nathanson wrote, Rule 605 data excluded orders under 100 shares entirely, leaving out much of what individual retail investors actually trade.

That specific gap has narrowed since: Battalio’s May 2026 testimony confirms the 2024 amendments added execution-quality reporting for odd lots — orders of fewer than 100 shares — for the first time. But Nathanson’s core critique still holds. The reports remain aggregated at the broker or market-center level, not broken out wholesaler by wholesaler, so an investor still can’t see whether their broker routed an order to the wholesaler offering the best execution or simply the one paying the most for the flow. Nathanson’s proposed fix — mandatory stock-specific and wholesaler-specific reports — is not part of the current rule.

A related gap sits entirely outside Rule 605 and 606: dark pools. FINRA describes dark pools as alternative trading systems that don’t broadcast pre-trade data — the presence, price, and size of buy and sell orders — the way lit exchanges do, which lets institutions execute large orders without moving the visible price first. FINRA publishes aggregate dark-pool volume weekly, but only after a two- to four-week delay, and that data sits alongside, not inside, the broker-level reports Rule 605 and 606 produce.

What This Means When You’re Acting on a Signal-Driven Trade

This matters for MarketPeel readers because of what happens after you spot a signal. Say you see a cluster of open-market Form 4 purchases, a fresh congressional stock disclosure, or a notable shift in 13F institutional ownership, and decide to act on it. The filing tells you what happened. Rule 605 and 606 are the plumbing that determines the price you actually realize once you place the order — the effective spread you pay, whether you got price improvement over the quote you saw, and how many milliseconds it took to fill.

None of that changes what the underlying signal means — it changes what it’s actually worth to you in practice. A signal is only as good as the execution behind the trade that follows it, and execution quality is exactly what these two rules exist to measure — part of the same broader shift in market-structure transparency we covered in our look at the SEC’s proposal to rescind the trade-through rule. Neither post is advice on which broker to use or when to trade — both are about the mechanics between a filing you read and the price you actually get.