Not necessarily. Companies that facilitate trades (eg, E-Trade) don't fall in this category, because their business model is about providing a service to regular people.
Jane Street is a proprietary trading firm. They have no external customers to whom they would provide goods or services. Their primary purpose is to invest the company's own money.
Jane Street is a proprietary trading firm. They have no external customers to whom they would provide goods or services. Their primary purpose is to invest the company's own money.