The JPMorgan chief and Amazon founder have found their companies’ fortunes increasingly entwined, but the balance of power between their firms has shifted.

Marriott said fewer customers were affected in a massive data breach than initially feared but that hackers had compromised the passport numbers of millions of people.

Apple’s stumble in China is an all-too-familiar story for rival Samsung Electronics. In five years, the iPhone’s biggest rival went from China’s No. 1 phone maker to an also-ran.

One year ago, Mark Zuckerberg set his sights on “fixing” Facebook. That remains very much a work in progress. At the top of the 2019 to-do list: find a balance between the social-media giant’s deeply held drive for growth and its heightened commitment to improving safety and security across its many platforms.

Apple blamed China’s economic slowdown for a lower revenue forecast, but the iPhone maker’s troubles run deeper in the country and extend into other markets.

Netflix is expected to name Activision Blizzard Chief Financial Officer Spencer Neumann as its new chief financial officer as early as this week.

Bill Gates said an effort to develop safer and cheaper nuclear reactors at a company he co-founded is now unlikely to proceed because of recent changes in U.S. policy toward China.

Artificial intelligence hasn’t taken off in the mining sector, which spends less on research and development in general than do other industries such as oil and gas.

Individual investors are nursing billions of dollars in cryptocurrency losses, including from alleged frauds. Regulators have managed to claw back only about $36 million over the past two years for duped investors.

Joel Kaplan, a former White House aide to a Republican president, has emerged as Facebook’s protector against allegations of political bias—and thus one of its most powerful and controversial executives.

Snap, which was once seen as a viable competitor to Facebook, is struggling after the CEO ignored warnings about a redesign that proved unpopular. With usership and the share price falling, analysts and employees are raising questions about whether his trust-your-gut management instincts can help pull the company through.

The airport late Friday again suffered a shutdown because of another drone sighting but was able to quickly resume flights, as one of Europe’s biggest airports made a fitful recovery from Thursday’s full-day closure.

Discord, which makes chat software popular among videogame players, is now valued at $2.05 billion after a new funding round, the startup’s second this year as it expands its footprint.

Fresh U.S. accusations of cyber thieving by China add to friction between the countries, though both sides show signs of trying to contain the damage while trade talks are under way.

Minneapolis authorities have decided not to charge Chinese billionaire Liu Qiangdong in a sexual-misconduct case, bringing to a close a turbulent period for the founder of e-commerce site JD.com since he was accused of rape in late August.

In less than 18 months, the last-man-standing videogame has grabbed onto American boyhood, pushing aside other pastimes and hobbies in a way few can resist. As games get smarter, and questions about screentime more urgent, parents feel outmatched.

Elon Musk’s rocket company, Space Exploration Technologies, is set to raise $500 million at a $30.5 billion valuation, in a bid to help get a satellite-internet service off the ground.

Global smartphone sales are flattening, which is why Apple and others are looking to India and its millions of newly minted consumers for growth. Yet the tech giant’s market share is falling, revenue is coming in well below expectations and its top leadership ranks are in turmoil.

Despite AI’s promise to help marketers reach consumers in ways that are better, faster and cheaper, executives can wind up wasting time and money when they actually try it.

Chinese cellular-technology giant Huawei is relying on a team of recently hired American lawyers to defend itself from an onslaught of accusations and restrictions emanating from Washington.

A Russian influence campaign used a range of social-media platforms to suppress African-American voter turnout and boost Trump, according to studies commissioned by the Senate.

The search giant is joining Amazon and Apple in growing outside the West Coast and has announced plans to lease a large office building in Manhattan’s West Village. Google also plans to invest $1 billion in the campus, which will also include two nearby buildings.

Elon Musk’s tunnel-digging venture, the Boring Co., is the latest to be drawn into the billionaire entrepreneur’s tradition of spreading overlapping resources across his growing technology empire. On Tuesday, the Tesla chief is set to unveil a test tunnel developed by the Boring Co., the first of what Mr. Musk imagines as a futuristic series of high-speed underground highways to alleviate traffic.

Mark Zuckerberg and his wife, Priscilla Chan, have hired a senior investor from Princeton University’s endowment as the first investing chief for their philanthropic arm.

The company that was once America’s biggest and most admired, the maker of power turbines, the seller of insurance, the broadcaster of “Seinfeld,” has become a shadow of its former self. This is the story of how generations of managers, who thought they could fix any company in any industry, finally ran into a problem they couldn’t solve.

Facebook said unshared pictures of up to 6.8 million users may have been exposed by a software issue that granted app developers access to the photos, the latest in a series of privacy snafus at the social-media company.

Chinese hackers are breaching Navy contractors to steal everything from ship-maintenance data to missile plans, triggering a top-to-bottom review of cyber vulnerabilities.

Apple’s plan to add thousands of jobs in Austin, Texas, San Diego, Seattle and Culver City, Calif., sketches out a road map toward a future reliant on services and higher-priced devices.

Social media’s so-called influencers have become sought-after brand ambassadors, with millions of followers and lucrative advertising deals. Now, the computer-generated Miquela Sousa character is testing the power of online celebrity.

General Electric reached a deal to sell off part of its GE Digital business and set aside the rest in a separate company, as the conglomerate narrows its focus and scales back its software ambitions.

The holiday season is looking merrier for Nintendo after a difficult summer, thanks to a hot-selling new “Super Smash Bros.” game and early signs that its Switch console is selling better.

Amazon’s announcement that it will bring 25,000 new jobs each to New York and Northern Virginia sparked a frenzy of activity. Lost in the commotion: It will take many years, if not a decade, before residents see an army of Amazon employees invading their cities.

Apple plans to invest $1 billion to build a new campus in Austin that could create 15,000 jobs, as it aims to make good on promises to boost contributions to the economy.

No Wi-Fi in the attic? Or basement? Joanna Stern tested six mesh Wi-Fi routers to find the best system to blanket your house or apartment in Wi-Fi.

Lam Research Chief Executive Martin Anstice has resigned after allegations of misconduct in the workplace, and the company has named its operating chief, Tim Archer, as his successor.