SEC Market Structure Proposals Target Payment for Order Flow and Best Execution Standards

The proposals would require brokers to route retail orders to exchanges rather than wholesalers, eliminate volume-based PFOF arrangements, and create a new best execution standard with quarterly reporting. Primary documents show the SEC estimates these changes would reduce retail execution quality by shifting flow to lit venues with wider spreads. Broker-dealer comment letters document that firms currently receive 15-25 basis points in PFOF revenue per share, which funds zero-commission trading.

Retail order flow currently accounts for 20-25 percent of equity volume and generates the majority of wholesaler profits through adverse selection advantages. The SEC's own data in the proposing releases indicate that PFOF arrangements produce price improvement averaging 1.5-2.0 mils per share for marketable orders. Eliminating this revenue stream would force broker-dealers to reintroduce commissions or reduce service levels to maintain margins.

The proposals coincide with increased retail participation post-2020, where individual investors drove 15-20 percent of daily volume during peak periods. Institutional market makers and exchange operators stand to gain from redirected flow, while retail brokers face documented cost increases of $200-400 million annually across the industry according to SIFMA estimates. No empirical study in the record demonstrates net investor harm from existing PFOF structures.

Implementation would require 18-24 months for systems changes and could trigger further consolidation among retail brokers unable to absorb fixed compliance costs. The Commission has not released updated economic analysis incorporating post-proposal comment data on execution quality impacts.