Some stock trades could get worse if SEC scraps Rule 611

For retail investors, the question behind the Securities and Exchange Commission’s proposal is simple: will stock trades get worse if one of the market’s old guardrails disappears? The agency’s answer, in Washington, is probably not by much on average. It wants to rescind Rule 611, the trade-through rule for National Market System, or NMS, stocks, and also drop the ban on locked and crossed quotations, but it says best-execution duties would still apply and many everyday orders already get filled at better-than-quote prices.

Inside the quote

The SEC’s case starts with how a lot of retail trading already works. Wholesalers often internalize marketable retail orders at prices significantly better than the national best bid and offer, or NBBO. That matters because the NBBO is the protected quote the rule was designed to defend. If a broker is already getting a better price inside that range, the agency says removing Rule 611 may not change the average result very much for those orders.

Not every trade will feel the same

Average execution quality is not the same as every individual fill. The SEC says some retail orders could still receive worse prices if the rule goes away. So even if the typical investor does not see a dramatic shift, some trades could land less favorably than they do now. The proposal is not presented as a promise that prices will improve, only that the broader retail market may not be as dependent on the protected quote as the old rule assumed.

The broker still has a duty

One thing the proposal does not touch is a broker’s obligation to seek best execution for customer orders. That duty remains the backstop if routing decisions start looking sloppy or self-serving. The SEC is asking whether that, plus the way wholesalers already price retail flow, makes Rule 611 less important than it once was. Comments on the proposal are due Aug. 17, 2026.