system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Google became Alphabet Inc. ; does that mean that Alphabet Inc. is now GOOG major shareholder?

Also does that mean that Alphabet Inc. could slowly sell it's stake and diversify from/completely abandon Google ? What would be the motive behind such decision? Are Brin and Page planning to become more like a Berkshire Hathaway of the 21st century? In that case why not rebrand the search engine instead of the parent company? As the Google brand is worth a lot while people might just shrug it off when they hear that Alphabet Inc. has invested in some venture.
gpt
Alphabet Inc is the only shareholder of Google. Those who had shares in Google got their shares transferred to Alphabet Inc. Even the stock tickers GOOG and GOOGL got transferred to Alphabet Inc. The reason to change the company structure and name is not quite clear. It is quite common in financial markets to be as diverse as possible. Having a separate holding company does allow you to be more diverse. There are a lot of cases when using one common brand for all your companies and products might not be the best way to do things. For example being diverse does mean that you invest in competing technologies and it might confuse people when two companies with the same brand are competing against each other. For example Alphabet Inc have companies delivering fiber internet and also researching satellite internet. It might be a bit odd to have Google Fiber compete against Google Satellite for customers. However dropping the Google brand makes sense in these cases and allows them to engage in healthy competition which benefits the holding company. You mention Berkshire Hathaway which is doing exactly this. They diversify their investments, use multiple recognized brands and creates an environment of healthy competition which benefits them the most.