Broker-dealer TD Securities failed to prevent a trader from placing and then withdrawing thousands of false trades over the course of a year in part because its compliance department failed to follow up on red flags generated by the illegal trades, three regulators said.

Aaron Nicodemus is the Editor-in-Chief of Compliance Week. He previously worked as a reporter for Bloomberg Law and as business editor at the Telegram & Gazette in Worcester, Mass. Email: aaron.nicodemus@complianceweek.com LinkedIn:...