The department cited national security concerns, saying Elon Musk’s company had played a crucial role in the Iran war. It also argued it has the authority to stop environmental lawsuits brought by citizens.

SpaceX exercised its option to acquire Cursor in an all-stock deal, bolstering Elon Musk’s ambitions in artificial intelligence.

They make much of the gear that goes into giant data centers. Demand for their products is shifting the balance of tech power.

As data centers sprout across Georgia, the state’s utility providers are building new power lines to meet the demand for electricity. We speak with residents in Fayetteville, about 25 miles south of Atlanta, who say the new lines will run through their backyards and make it impossible to resell their homes at their current value.

The company’s shares jumped on Monday, and executives announced that they had raised even more money in an already record-breaking initial offering.

The administration’s surprise restrictions Friday cut off foreign access to Anthropic’s latest models and sparked another round of finger pointing.

Britain said it would ban social media access for children under 16 starting in 2027, joining several other countries introducing similar measures.

Prime Minister Keir Starmer said his government planned to bar children under 16 from social media, following similar efforts in Australia and elsewhere.

A U.F.C. fight on President Trump’s birthday will now double as a capstone for Paramount’s successful effort to secure Justice Department approval for a mega media merger.

OpenAI said that a coalition of states had opened an investigation over a wide range of its practices, including its handling of user data, safety of minors and advertising activities.

The company said on Friday night that the federal government had ordered limits on its Mythos and Fable 5 A.I. systems, citing national security concerns.

How bettors are turning statistical glitches into guaranteed profits.

Elon Musk said he had initially given SpaceX less than a 10 percent chance of succeeding. His rocket company has come a long way.

Strong investor interest in SpaceX could be good news for the A.I. rivals, which have signaled that they, too, intend to go public this year.

The blockbuster stock market debut of Elon Musk’s rocket company paves the way for a wave of enormous offerings that are coming from OpenAI and Anthropic.

If you have index funds — such as in a 401(k) — they may soon include shares of the mega company. Here’s a rough calculation.

With SpaceX shares soaring 20 percent on their first day of trading, the world’s richest person crossed another milestone — one with 13 digits.

A tech titan, a digital rights defender and two menacing-looking robot dogs took the stage at our second-ever live show.

In a lawsuit, the tech giant accused the group of using Google’s Gemini system to create hundreds of fake corporate and government websites.

Elon Musk’s rocket company said it would sell more than 555 million shares at $135 each in its blockbuster initial public offering, which is set to begin trading on Friday.