As if $125 million were not enough, Box has expanded its gargantuan funding round to $150 million, according to an SEC filing.

A company spokesperson said this will allow existing investors to “make additional investments.” The cloud storage startup had not filed the paperwork for its fifth funding round until today — although the news was announced in late July. The news was originally reported in AllThingsD. 

Since it closed its series E round, Box opened an office in Europe and brought on Google Docs’ founder Sam Schillace as its VP of Engineering, among other strategic hires. It also unveiled a host of new product features that make it easier for third-party developers to integrate with Box’s API.

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The previous round was led by General Atlantic with participation from Bessemer Venture Partners, DFJ Growth, New Enterprise Associates, SAP Ventures, Scale Venture Partners, and new investor Social+Capital Partnership.

Box’s CEO Aaron Levie (pictured, above) recently revealed plans to file for an initial public offering in 2014.