• The S&P 500 erased its 2025 loss.
• Saudi Arabia is investing $600 billion in a series of deals with the U.S.
• Microsoft is laying off 3% of its workforce.

Here are five key things investors need to know to start the trading day:

1. And just like that

The is back in the green. After being at one point down more than 17% for the year, the index rose 0.72% Tuesday to erase its 2025 loss. Hopes for a trade war détente and a helped push stocks higher during the trading session. The closed up 1.61% for its fifth-straight day of gains, thanks in part to a in shares of . But a nearly in shares of weighed on the , which sank 269.67 points, or 0.64%.

2. $600 billion 'bromance'

At the start of President Donald Trump's trip to the Middle East, the on Tuesday announced that Saudi Arabia has committed to in the U.S. Speaking at the in Riyadh, Trump praised the Saudi kingdom and its leader, Crown Prince Mohammed bin Salman, with one summit attendee describing their relationship as a Trump also announced that the U.S. will , and he Ahmed al-Sharaa in Saudi Arabia the next day. Other news that came out of the forum included Nvidia's plans to of its latest AI chips to Saudi company Humain, and of Elon Musk's Starlink for aviation and maritime use in the kingdom.

3. More tech layoffs

is laying off — about 6,000 people — the company said Tuesday. The cuts across all levels, teams and geographies likely represent the tech giant's largest round of layoffs since 2023, when it , and follow a small round of in January. "We continue to implement organizational changes necessary to best position the company for success in a dynamic marketplace," a Microsoft spokesperson said in a statement to C온라인카지노사이트. One objective of the new round of cuts, which are not related to performance, is to reduce layers of management, the spokesperson said.

4. IPO plans

Fintech company Chime filed paperwork on Tuesday to , and it wants to make one thing clear: "Chime is a technology company, not a bank," the digital banking firm . The company brought in $518.7 million in revenue in the March quarter with 8.6 million active members, about 23% more users than the same time last year. Chime, which plans to file under the ticker symbol "CHYM," is only the latest emerging tech company to test the market's appetite for new offerings. Digital physical therapy startup Hinge Health said Tuesday it plans to in its upcoming IPO, while stock brokerage platform eToro above its expected range at $52 a share. , which reports its first-quarter earnings results after the bell Wednesday, at the end of March.

5. 'Good at bad stuff'

Experts are about the safety of artificial intelligence — or the lack thereof. As companies like , and race to stay competitive, AI players have shifted from focusing on cutting-edge research to prioritizing the development of revenue generating, . In the process, they're increasingly taking shortcuts when it comes to the safety testing of their models, experts say. "The models are getting better, but they're also more likely to be good at bad stuff," said James White, CTO at cybersecurity startup Calypso.

— C온라인카지노사이트's Brian Evans, Yun Li, Jesse Pound, Kevin Breuninger, Natasha Turak, Kif Leswing, Lora Kolodny, Jordan Novet, Samantha Subin, Ashley Capoot, Hayden Field, Jonathan Vanian and Jennifer Elias contributed to this report.