Parking Panda Corp. has raised $4.7 million via sale of shares to 21 investors, according to an SEC filing.

In 2011, the Baltimore-based startup received $25,000 in seed funding from Entrepreneurs Roundtable Accelerator, an early-stage seed fund and technology accelerator.

Founded in 2011 by Adam Zilberbaum and Nick Miller, Parking Panda is an online marketplace and optimization platform for parking. It enables parking owners and managers to capitalize on their parking inventory by driving extra traffic when yield is low and improving pricing when the lot is full. The company is the official parking partner for the Baltimore Grand Prix.