WASHINGTON — The Financial Industry Regulatory Authority fined TD Ameritrade Inc., Scottrade Inc., and Fidelity Brokerage Services LLC $35,000 each for failing to disclose the underlying ratings of insured bonds, which it said constituted material information that customers purchasing the bonds needed to know.

Though the enforcement actions, which were publicly released Tuesday amid an ongoing FINRA “sweep” into retail sales practices, it was unclear if they were related to the sweep or were stand-alone cases.

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