The Wall Street Journal is reporting that the biggest firms in Silicon Valley have invested $400 billion into artificial intelligence technology just this year. Tech companies like Meta, Alphabet, ...

To quickly catch you up on how things shook out, here's a rundown on the main takeaways from Alphabet, Amazon, Apple, Meta, and Microsoft.

Alphabet Inc. and Amazon.com Inc. were rewarded by investors for reporting better-than-expected third-quarter profits. At both companies, earnings were boosted by the increased value of their stakes ...