The Securities and Exchange Commission Monday charged the former chief financial officer of optionsXpress and three other officials of the online options and futures brokerage of engaging in “an abusive naked short selling scheme’’ involving billions of dollars of sham trades.

Charged in the case were one-time CFO Thomas E. Stern of Chicago as well as head of trading and customer service Peter J. Bottini and compliance officers Phillip J. Hoeh and Kevin E. Strine.

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