trading company; trading firm
A company that engages in domestic and/or international trade, buying and selling goods. Often used for large general trading companies (総合商社) as well as smaller specialized ones.
He works for a major trading company.
We import raw materials from overseas through a trading company.
After graduating from university, he joined a major trading company.
My older sister works at a trading company in Tokyo.
His father runs a small trading company.