The former head of a New York-based brokerage firm has been sentenced to six months in jail for producing false documents to thwart a regulatory investigation, the U.S. Securities and Exchange Commission (SEC) announced on Thursday.

Charles Moore, 63, the former CEO of Crucible Capital, Inc. was sentenced after he admitted to obstructing a regulatory exam conducted by the SEC.

Last November Moore pled guilty to having a Crucible employee falsify invoices and provide them to an SEC examination team in response to a document request.

According to the plea agreement, the purpose of the false invoices was to hide the true extent of Crucible’s debts from the SEC examiners, and to make it appear that the firm’s reported capital position was accurate.

The SEC also settled separate civil charges it had filed in the case by banning Moore from the industry.