Русско-англо-русский юридический словарь

An individual entrepreneur who is not in a position to satisfy the demands of creditors connected with his conduct of entrepreneurial activity may be declared insolvent (or bankrupt) by decision of a court. (Перевод ст. 25 ГК РФ на английский, выполненный учёным-компаративистом Питером Б. Мэггсом)

If you’re a sole trader, you run your own business as an individual and are self-employed. (GOV.UK)

A sole proprietor is someone who owns an unincorporated business by himself or herself. (official website of the Internal Revenue Service)