One of the most popular fitness tracking companies in the world, Fitbit, has been making such a success of its wearables that it has just announced it will be filing for a $100 million Initial public offering (IPO).

The company will be looking to investors for the initial figure, but that may as well change as interest in the company grows – or declines. Also as part of its massive expansion plans, it aims to be listed on the New York Stock Exchange under the symbol ‘FIT’.

From FitBit’s S-1 filing, the company had to make known that it has sold 20.8 million devices with half of that only sold in the last year, made $745.4 million revenue last year, and that at the end of 2014 it had 6.7 million active users.

“Fitbit is transforming the way millions of people around the world achieve their health and fitness goals. Fitbit appeals to a large, mainstream health and fitness market by addressing these key needs with advanced technology embedded in simple-to-use products and services,” it explained in the filing.

But why does the company want to file now? Besides being one of the most popular brands in the world, it estimates that the health sector is only going to grow in the coming years: “Based on information from industry sources, we estimate this market represents an over $200 billion opportunity and includes consumer spend on health and fitness services, such as gym and health club memberships, commercial weight management services, and consumer health products, such as weight management products and dietary supplements,” it added.