(Reuters) - FireEye Inc <FEYE.O> reported a marginal fall in quarterly revenue, its first ever as a public company, as demand for security software slows after two years of strong growth.
The company's shares fell as much as 20 percent to $10.35 in after-market trading on Thursday.
FireEye, which provides web, email and malware security to businesses and governments, said its revenue slightly fell to $184.7 million in the fourth quarter ended Dec. 31, from $184.8 million a year earlier.
Net loss attributable to shareholders narrowed to $61.5 million, or 37 cents per share, from $136.1 million, or 87 cents per share.
(Reporting by Narottam Medhora in Bengaluru; Editing by Shounak Dasgupta)