Marqeta has achieved a historic milestone in Q1 2026 by delivering its first quarter of GAAP net income profitability ($8 million) alongside robust 33% TPV growth. This demonstrates the operating leverage inherent in its modern card issuing platform. However, the company faces significant growth headwinds in fiscal 2026, primarily driven by contract renewals with large clients and Block reaching a higher pricing tier, which decelerates gross profit growth expectations to 10%-12% for the full year (down from 24% in 2025). While the long-term embedded finance opportunity remains massive and international expansion is accelerating, the near-term growth deceleration and high customer concentration warrant a Hold rating until the platform proves it can successfully diversify its revenue base and sustain annual GAAP profitability.