WASHINGTON — A Financial Industry Regulatory Authority hearing panel has fined Syosset, N.Y.-based David Lerner Associates Inc. $2.3 million and suspended head trader William Mason for six months with a $200,000 fine for charging excessive markups on municipal bond and collateralized mortgage obligation transactions over a two-year period.

The panel also ordered the firm to pay more than $1.4 million, plus interest, in restitution to affected customers, according to the hearing panel’s decision, which was released Wednesday.

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