Berkeshire Hathaway and their 'Four Giants'

In my latest personal Data Viz project, I explore the most expensive publicly traded stock of all time.
Berkshire Hathaway is not just one business, but a holding company for dozens of companies and well-known brands.
You’ve likely heard of its 91-year-old CEO, Warren Buffett, the ‘Oracle of Omaha’. But what actually is Berkshire Hathaway? What businesses do they own completely or in part?
The bulk of Berkshire’s value is derived from what Buffet refers to as the “Four Giants”. Explore data on Berkshire's holdings below.