NEW YORK (

TheStreet

) -

Fannie Mae

(FNMA.OB)

CFO David Johnson will resign by year-end, according to a company filing on Tuesday.

Until a successor is named, Johnson's deputy, David Hisey, will take over his role on an interim basis.

Fannie Mae did not provide a reason for Johnson's departure in its 8-K filing with the

Securities and Exchange Commission

. A spokesperson could not immediately be reached for comment.

Johnson has been in the position since November 2008, a couple months after Fannie and sister company

Freddie Mac

(FMCC.OB)

were placed into conservatorship by the federal government.

Hisey joined the company in 2005 as president of financial controls and operations, eventually moving up the ranks to his current position. Before Fannie Mae, he was an executive at management consultancy and systems integration company BearingPoint and prior to that had been an audit partner with KPMG.

-- Written by Lauren Tara LaCapra in New York

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