Payment for order flow (PFOF) in U.S. equities reached record levels according to a Moody's Investors Service research note referenced by Investment Executive.

The single-sentence headline finding carries weight because Moody's is the principal credit-rating agency active in U.S. broker-dealer and market-maker credit. Capacity assessments of that scale draw on capital ratios, revenue mix, and inventory-financing inputs. The Investment Executive citation does not include the underlying Moody's report excerpt in the version circulating via news aggregation; specific dollar amounts, time series, and methodology are not in the headline brief.

What is measured

PFOF is the compensation a retail broker-dealer receives for routing client orders to a wholesale market maker instead of to an exchange or alternative trading system (ATS). The payment arises because the wholesaler internalizes the spread: it executes against the retail order at or inside the NBBO and keeps the price-improvement portion rather than paying an exchange rebate tied to the displayed quote.

How the routing decision works

Retail brokers score wholesalers on fill rate, execution speed, price improvement versus the NBBO, and reliability of post-trade reporting under SEC Rule 606. The PFOF rebate flows back to the broker inside that bundle of economics. Off-exchange routing covers a meaningful share of consolidated U.S. equity volume based on publicly cited FINRA trade-reporting data, and retail orders are a significant subset of the wholesaler-routed activity.

Why capacity matters

A record Moody's reading on wholesaler capacity means balance sheets continue to absorb the inventory risk of marketable and non-marketable retail flow. For buy-side desks the indirect implications include posted depth at the NBBO during retail-heavy sessions, effective spreads in names with concentrated retail flow, and queue behavior at the primary listing venue during volatile periods. The rating-agency read is structural, not seasonal.

Who the counterparties are

Wholesale market making remains concentrated. Citadel Securities, Virtu Financial, and a narrower tier of registered market makers publish execution-quality statistics under SEC Rules 605 and 606. Citadel Securities has historically disclosed market-making revenue and execution volumes through Citadel LLC financials; Virtu publishes segment performance in 10-K and 10-Q filings. Both firms are the dominant counterparties for retail PFOF under the post-2018 disclosure regime.

Regulatory pressure continues to weigh on the model

The SEC's 2022 package of equity market-structure proposals — including amendments to Regulation ATS for certain government-securities trading platforms (Rule 615) and the separate order-competition rule — would, if adopted in original form, reset the routing economics that underpin PFOF. Compliance dates for any final rule will be set by the SEC and will bind broker-dealers, exchanges, and ATSs. As of late 2025, adoption timelines remain unfinalized in the public regulatory agenda.

What the Moody's note likely analyzed

Rating-agency reviews of broker-dealer capacity typically test three inputs: aggregate market-making revenue, securities-lending income from inventory carried overnight, and capital adequacy versus stress volatility. A record PFOF print implies the first two measures remain robust. The third — capital against stressed volatility — is the binding limiter on capacity, with the January 2021 GameStop episode as the operative stress benchmark.

Open questions for execution desks

The Investment Executive citation does not specify whether the Moody's finding measures aggregate dollars paid to broker-dealers, the share of U.S. equity volume routed through wholesalers, or per-share PFOF economics relative to NBBO spread. Each measure implies a different read on retail execution economics. Traders reconciling the finding against their own transaction-cost analysis will need the underlying Moody's report.

Looking ahead

Capacity has held; policy is the variable. Execution teams will watch the SEC's market-structure rule calendar for any final adoption that could reset the routing economics the Moody's note documents.