Internet security and infrastructure provider VeriSign Inc said its chief financial officer Brian Robins has resigned effective September 7.

The company said it will name an interim chief financial officer soon.

Robins, who has served as CFO since August 2009, will assist during the transition through September 30.

The company also reaffirmed its outlook for 2011.

Shares of the Dulles, Virginia-based company were down more than 9 percent at $30.80 in heavy extended trade. They closed at $33.91 on Thursday on Nasdaq.