Uber and Lyft both went public this year but drew criticism over their heavy losses.
WeWork's stock market debut - one of the most hotly anticipated financial events of the year - is also in doubt.
The company rents office space for the long-term, subletting that space to firms and individuals on more flexible lease terms.
SoftBank, the Japanese investment firm that owns about 30% of WeWork, has reportedly urged the property company to drop its flotation plans.
The pressure follows signs that outside investors do not value the much-hyped firm as highly as SoftBank did when it invested last year.