Good Sunday morning, and welcome to a special edition of the DealBook Briefing, where we’ll take a deep dive into Uber’s upcoming public offering — the most hotly anticipated I.P.O. of 2019. (Was this email forwarded to you? Sign up here.)

This is the big one

Uber’s initial public offering will be one of the largest in tech-industry history. It’s also the biggest test yet of investors’ appetite for money-losing unicorns on the public market and, as Mike Isaac of the NYT points out, part of the company’s attempts to demonstrate that it has evolved past its tech-bro culture.

The going has been good for I.P.O.s this year. Zoom Video Communications has more than doubled in value since its I.P.O., PagerDuty is up 90 percent and Pinterest has gained about 60 percent.

But there’s still the Lyft effect to worry about. Shares in Uber’s rival are down about 20 percent since its I.P.O. In that case, investors’ primary concern is whether a company that lost about $1 billion last year can become profitable.