Corporate credit card startup Ramp is raising its fourth round of venture funding in under eight months, underscoring how back-to-back fundraising rounds—with relatively little business progress in between—is becoming the norm for startups in hot fields such as financial services.

Founders Fund is leading a new funding round that also includes Iconiq Capital, a firm that invests the money of high net worth individuals such as Mark Zuckerberg and Jack Dorsey, according to a person with direct knowledge of the matter. The deal values the two-year-old Ramp at about $3.8 billion—more than double its paper valuation in March, according to another person.