#3 Henry Wellcome | $56.7 billion | Wellcome | Henry Wellcome (1853-1936) was a pharmaceutical entrepreneur. In 1880, Silas Burroughs and Henry Wellcome, two pharmaceutical salesmen from America, started a new company in London called Burroughs, Wellcome & Co. They used to sell remedies and medicines throughout the UK. After his death, the Wellcome Trust was founded in 1936, to improve health by supporting scientific research and the study of medicine. Funding for this mission came from the profits of the pharmaceutical business he had built up over 50 years.
Wellcome Trust