The ride-hailing giant Uber Technologies Inc. is not a public company, but every three months, dozens of shareholders get on a conference call to hear the latest details on its business performance from its head of finance, Gautam Gupta.

On Friday, Gupta told investors that Uber’s losses mounted in the second quarter. Even in the U.S., where Uber had turned a profit during its first quarter, the company was once again losing money.

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“It’s hardly rare for companies to lose large sums of money as they try to build significant markets and battle for market share,” said Joe Grundfest, professor of law and business at Stanford. “The interesting challenge is for them to turn the corner to become profitable, cash-flow-positive entities.”