As of my last knowledge update in September 2021, the top 5 Big Tech companies, often referred to as the “Big Five” or “FAAMG” (Facebook, Apple, Amazon, Microsoft, and Google), are:

  1. Apple Inc. (AAPL):
    • Apple is known for its consumer IT company Scranton PA electronics, software, and services. It designs and manufactures products like the iPhone, iPad, Mac computers, and operates services such as the App Store and iCloud.
  2. Amazon.com Inc. (AMZN):
    • Amazon is a global e-commerce and cloud computing giant. It operates online marketplaces, offers a wide range of products and services, and is a leading provider of cloud infrastructure through Amazon Web Services (AWS).
  3. Microsoft Corporation (MSFT):
    • Microsoft is a technology company known for its software, hardware, and cloud services. Its products include Windows operating systems, Microsoft Office suite, Azure cloud platform, and Surface devices.
  4. Meta Platforms, Inc. (formerly Facebook, Inc.) (META):
    • Meta Platforms is a social media and technology company. Its flagship platform is Facebook, but it also owns Instagram, WhatsApp, and Oculus VR.
  5. Alphabet Inc. (GOOGL/GOOG):
    • Alphabet is the parent company of Google. Google is a dominant player in online search, advertising, and digital services. Alphabet also encompasses other initiatives such as self-driving technology (Waymo) and life sciences (Verily).

Please note that the status of these companies can change over time due to market dynamics, technological shifts, and other factors. It’s recommended to check current and reliable financial sources for the latest information on these companies and their rankings.