The 'Magnificent 7' tech stocks add $150 billion of market cap in a day, with Microsoft leading the charge as investors zero in on the OpenAI psychodrama

• The "Magnificent Seven" mega-cap stocks' stellar 2023 continued Monday.
• The Big Tech giants added $150 billion to their combined market cap in a single day, driven higher by investors' renewed focus on AI.
• Microsoft and Nvidia led the charge, with both companies' share prices hitting fresh all-time highs.

The "Magnificent Seven" stocks' stellar 2023 continued Monday, as investors' renewed focus on artificial intelligence powered two of the group's members to fresh all-time highs.