Castle Information Systems Inc., a web and mobile app company, raised $875,000 in a private offering, according a Securities and Exchange Commission filing.

The Form D, filed on Aug. 25, said the company sold the shares to a single investor 15 days prior. The company did not say what its plans are for the proceeds.

Five years ago, the company offered equity amounting to $125,000.

Raleigh-based Castle Information is best known for its Blerbal app.

A week after its 2011 offering, the company applied to trademark the Blerbal mobile app, according to the U.S. Patent and Trademark Office.  The app allows users to report news and information to their communities and groups.

David Cozart is the president of Castle Information Systems, which was previously called Swamp Castle.

Companies relying on a Reg D exemption do not have to register their offering of securities with the SEC, but they must file what’s known as a Form D electronically with the SEC after they first sell their securities.

Here’s the filing: SECfiling

This story is from the North Carolina Business News Wire, a service of UNC-Chapel Hill’s School of Media and Journalism.