The SEC does not halt or revoked stocks from trading on the mere say so of a disinterested 3rd party. Their website is open to all to file complaints. <A HREF="http://www.sec.gov/complaint.shtml" target="_blank">http://www.sec.gov/complaint.shtml</A> If they discover in the course of their investigation that the complaint was erroneous then nothing will happen and the stock will continue trading. I wouldn't sweat one person filing a complaint about a stock. Unless of course the complaint was factual.