Back in January when MHW stopped by the Fitbit display on the convention floor of CES 2013 in Las Vegas, it was a terrific reminder of how mobile technologies are being leveraged to improve our health and fitness. It was also a terrific reminder of how far Fitbit has come and how fast it has grown.

On Tuesday, we witnessed another compelling example of the company’s runaway growth when confirmation came of its fourth round of funding, which reportedly raised more than $30 million.

Fitbit’s valuation now stands at $300 million or higher.

Sources are yet to confirm the investors in this most recent round, although when Fitbit last raised $12 million in January 2012, funding came from Foundry Group, True Ventures, SoftTech VC and Felicis Ventures.

Industry expectations for Fitbit remain overwhelmingly positive as the company continues to innovate and expand upon its popular product lines.

In January, when we last caught up with Fitbit, the company was preparing for the release of its Fitbit Flex, a Fitbit designed for your wrist.