Brex turns to debt to fuel its next stage of growth. : Brex, widely known for its billboards littered across San Francisco, has secured a $100 million debt financing from Barclays Investment Bank . The company, which provides a corporate credit card designed specifically for startups, has previously raised $215 million in equity funding at a $1.1 billion valuation in the less than two years since it graduated from the Y Combinator startup accelerator.