Mr. Allen. (Ted Thai / Getty Images)

Facebook’s S-1 filing is out, and almost all the early reports were true. The company has reserved the ticker symbol FB, although it has not announced on which exchange it will debut; the working number is $5 billion and the lead underwriter is Morgan Stanley.

Reporters were also able to sniff out four other banks working on the IPO: J.P. Morgan, Goldman Sachs, Bank of America and Barclay’s Capital. But one underwriter slipped through: the boutique New York-based investment bank Allen & Company, which puts on the annual Sun Valley conference that regularly attracts billionaires and media moguls. 

Allen & Co., headed by the press-shy Herb Allen Jr., also boasts former CIA director George Tenet and Bill Bradley, the former U.S. Senator and NBA hall of famer. It has a strong presence in Hollywood and also helped on Google’s IPO.

The preliminary filing doesn’t say what percentage each bank will get.

Adrianne Jeffries is the editor of Betabeat. Follow Adrianne on Twitter or via RSS. ajeffries@observer.com