As of September 2019, it is estimated that Satoshi Nakamoto, the creator of Bitcoin, owns approximately 1.1 million bitcoins, which equates to around 6% of the total supply.
However, it is possible that Nakamoto has lost some of his/her bitcoins over the years, as he/she has never moved them from their original address. If Nakamoto does still own these bitcoins, then he/she is by far the richest person in the world when it comes to Bitcoin.
There are a number of other early investors and developers who are thought to own large amounts of Bitcoin. For example, it is believed that Roger Ver, an early investor and promoter of Bitcoin, owns around 100,000 bitcoins.
Similarly, it is thought that Bitmain co-founder Jihan Wu owns around 1% of all bitcoins in circulation.
While there are a number of very wealthy individuals who own large amounts of Bitcoin, it is also worth noting that there are a number of organizations and entities who hold significant amounts of Bitcoin as well. For example, it is estimated that the cryptocurrency exchange Binance holds around 7% of all Bitcoin in circulation.
Similarly, the cryptocurrency wallet provider Blockchain.com is also thought to hold a large amount of Bitcoin.
In conclusion, while there are a number of individuals and organizations who own large amounts of Bitcoin, it is still unclear as to who owns the most Bitcoin. However, what is clear is that Satoshi Nakamoto, the creator of Bitcoin, is by far the richest person in the world when it comes to Bitcoin.