The Seattle-based company said revenue for the quarter ended last month rose 12% sequentially and 39% from a year ago to $111.7 million. Analysts surveyed by Thomson Financial were looking for revenue of $105.5 million.
For the first quarter ending Dec. 31, the company expects revenue of $116 million to $118 million, against a $110 Thomson target.
"The company's strong revenue growth during the quarter and throughout the year was driven primarily by the ongoing strength in its core application delivery networking business," F5 said.
The company didn't report earnings because it is yet to complete a probe of apparent stock option backdating. F5 said it will probably have to restate earnings going back to 1999 to the tune of $30 million in unrecognized stock compensation costs.
The company said it is continuing to cooperate fully with both the Department of Justice and the Securities and Exchange Commission in their respective inquiries regarding the company's historical stock option practices.
Shares rose $6.04 to $64.16.