https://www.visualcapitalist.com/oldest-companies/ is also rather interesting to look at. The oldest one in Japan: > The Japanese temple and shrine construction company, Kongō Gumi Co., Ltd. (founded in 578) has weathered a few storms over the millennia, from nuclear bombs to financial crises. In 2006, it was bought by the construction conglomerate, Takamatsu Construction Group Co., and continues to operate today.
Canterbury Cathedral was founded in 597. I find it kind of wild that those two events were only nine years apart.