Human cloud/ride-sharing firm Lyft announced today that it has filed a confidential registration for an initial public offering with the US Securities and Exchange Administration.

“The number of shares to be offered and the price range for the proposed offering have not yet been determined,” according to the announcement. “The initial public offering is expected to commence after the SEC completes its review process, subject to market and other conditions.”

Lyft ranks as the third-largest B2C human cloud platform with estimated gross spend of $5.26 billion in 2017. Only Uber and China-base ride hailing firm Didi Chuxing are larger.

Uber is also reported to be planning an IPO.

TechCrunch reported that Lyft was last valued at $15 billion while Uber was valued at more than $100 billion.