The We Company, parent of shared workspace firm WeWork, has filed for an IPO, the company said on Monday. 

The company confirmed in a press release that it filed its S-1 paperwork confidentially in December 2018. It didn't specify any further details about its IPO plans, however. 

WeWork, a network of shared workspaces that renamed itself the We Company when it expanded into other businesses such as education and residential real estate, was valued at $45 billion in its last funding round in 2018. Its largest investor is SoftBank (SFTBY) , which committed $3 billion to WeWork in that investment round. 

The company joins a slew of highly-valued tech companies that have recently gone public or plan to soon, including Lyft (LYFT) , Pinterest (PINS) , Zoom (ZM) and Uber.