Retail order flow reshapes itself around new disclosure rules

The debate over where retail stock orders go and who profits from routing them has moved from congressional hearings to comparison tables. Standardized execution-quality disclosure has made price improvement measurable across brokers, and measurable things become competitive.

Brokers now market execution statistics the way they once marketed zero commissions, and wholesalers compete for flow on documented improvement rather than relationship inertia. Market-structure researchers describe the disclosure regime as achieving quietly what more dramatic interventions promised: discipline through visibility.

The unresolved argument concerns what the metrics miss, benchmark construction, odd-lot treatment, the counterfactual of exchange execution. The debate continues in comment letters, which is to say the system is working; the fights worth having are now about measurement rather than secrecy.