https://phys.org/news/2018-09-alibaba-co-founder-jack-ma.html > His own worth has soared along with that of the company, which has added cloud computing, films and e-payments to its growing portfolio and was valued at $420.8 billion when the stock market closed on Friday. > Ma told The New York Times that he plans to step down from the company on Monday—his 54th birthday—referring to his departure as "the beginning of an era" rather than an end.