WASHINGTON — Oppenheimer & Co., WFG Investments, and E*TRADE are three of seven firms that the Financial Industry Regulatory Authority fined a total of $412,500 for trading municipal securities below the minimum denomination.

The cases were included in FINRA's monthly disciplinary actions released on Tuesday. FINRA also imposed a total of $90,000 in fines against New York City-based BGC Financial, L.P. and Memphis-based Duncan-Williams, Inc. for failures in reporting muni transactions as well as a $225,000 fine against Oppenheimer in New York City for supervisory failures.

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