Including the money Lyft is expecting to raise from the IPO as well as some likely dilution of shares, its total valuation could be $21-23 billion.
Selling a stake in the self-driving business would allow Uber to offload part of a very expensive endeavor, as it faces scrutiny from prospective investors in an IPO planned for the coming months.
Uber is testing a program where it rents out fully equipped, commercial-grade kitchens to serve businesses selling food on delivery apps like Uber Eats.
The companies may announce a cash-and-shares transaction that values Careem at about $3 billion in the coming weeks.
A wave of IPO news has followed with Slack, Pinterest and Postmates all moving closer to listings of their own.
Lime plans to follow the Uber playbook of persistent private fundraising, in a bid to establish itself as the dominant player for electric-scooter rentals.
Like many unicorns, San Francisco-based Uber is emphasizing growth over profits.
Both Uber and Lyft are closely watching whether another shutdown will go ahead at the end of this week as they prepare for IPOs later this year.
New funding rounds for Lime and Bird value the California-based companies at about $2 billion, down from the roughly $3 billion-or-higher valuations they were said to be chasing as recently as a few months ago.
SoftBank, which has already invested more than $8 billion in WeWork, had discussed potentially spending $16 billion to buy a larger position in the company.