Customer Concentration Risk: A significant portion of Marqeta's revenue is derived from a limited number of large customers, particularly Block (Square). The loss of, or reduced activity from, one of these key customers could materially impact Marqeta's financial performance and growth prospects.

Intense Competition Risk: Marqeta operates in a highly competitive market for payment processing and card issuing infrastructure. They face competition from established financial institutions, large technology companies (like Stripe and Adyen), and emerging fintech providers, which could lead to pricing pressure or loss of market share.

Regulatory and Compliance Risk: The payments industry is subject to extensive and evolving regulations globally, including those related to financial crime, data privacy, consumer protection, and licensing. Failure to comply with these complex regulations could result in significant fines, operational restrictions, or reputational damage.