According to FINRA, Virtu Americas LLC was censured and fined $200,000 in January 2026 for failing to take reasonable steps to ensure that the intermarket sweep orders (ISOs) it routed to certain market centers met applicable regulatory requirements—potentially resulting in a failure to execute against protected quotations at other trading venues.FINRA found that the New York-based firm used an automated program to send limit orders marked as ISOs to execute against equal- or better-priced quotations displayed at other trading centers. However, the logic in the firm's automated program was not appropriately configured for DAY ISOs transmitted to the exchanges. Instead of routing limit orders correctly marked as ISOs, the program in certain instances routed limit orders that were not marked as ISOs. Because the firm was obligated to route these orders as ISOs—and failed to do so—it potentially missed executing against protected quotations during the relevant review period.ISOs are an important mechanism under Regulation NMS, the SEC rule that governs order routing and the protection of quotations across trading venues. When a firm routes an ISO, it is attesting that it has simultaneously routed orders to execute against all better-priced protected quotations displayed at other trading centers. Mismarking orders as ISOs—or failing to correctly use ISO routing when required—can undermine Reg NMS's core goal of ensuring that investors receive the best available prices across the national market system.Of the $200,000 total fine, $6,930 was apportioned to FINRA, with the remainder distributed to other regulators participating in the settlement. Virtu Americas cooperated with the examination and remediated the configuration issue in its automated routing program.For investors, this case serves as a reminder that the integrity of automated trading systems depends heavily on accurate configuration and ongoing supervisory oversight. Even small technical errors in order routing logic can have broad market impact when they affect large volumes of trades. Firms that operate automated trading infrastructure have a responsibility to regularly test and validate their systems to ensure they comply with applicable rules governing trade execution and order routing.