SEC Watch: Cloud Storage Startup Raises $18.6 Million More has raised $18.6 million out of a $35 million round according to an SEC filing. We’ve confirmed this with the company. This brings Box’s total funding to $96 million.

Box, which has 6 million users and stores 300 million documents, is a cloud storage platform for the enterprise that comes with collaboration, social and mobile functionality. Box has evolved into more than just a fils storage platform, and has become a full-fledged collaborative application where businesses can actually communicate about document updates, sync files remotely, and even add features from Salesforce, Google Apps, NetSuite, Yammer and others.

Box just raised $48 million from Andreessen Horowitz and others earlier this year, but the company’s CEO and co-founder Aaron Levie tells us that because of the strong venture market, the company’s strong performance, and the growth in the cloud, a new ‘expansion’ round made sense. He says this is a follow-on round to the D raise earlier this year, and it will involve current investors and new ones as well.

The round hasn’t been fully closed yet, and could change, says Levie. Listed in the filing are current investor Draper Fisher Jurvetson, U.S. Venture Partners, and Scale Venture Partners.