In an e-mail, a publicist hired by NetQin, Sean Angus from Spark PR, said the allegations were surprising and were "set up by a competitor and are completely false."

In a telephone interview, NetQin spokeswoman Elena Lau, said NetQin's antivirus software had never been sold by the three China-based carriers in their app stores. She said that NetQin had no comment on whether a competitor fabricated the false stories.

"This is a non-event," Lau added, and said she could not comment beyond the statement because NetQin is in a silent period, since it has filed its IPO prospectus to list its shares on the New York Stock Exchange.

SEC records show that NetQin filed for its IPO on March 15 to use the ticker symbol "NQ," and listed Piper Jaffray as the lead underwriter. Net revenues at NetQin were $4 million in 2008, $5.3 million in 2009 and $17.7 million in 2010, according to its IPO report.

NetQin offers mobile security products as well as mobile productivity and intelligent services, primarily for users. About 35% of NetQin's revenues in 2010 came from subscribers outside of China. Frost & Sullivan has reported that NetQin had 67% of China's mobile security market at the end of 2010.