Top U.S. Startups That Secured Funding In March 

In March 2025, a wave of significant investments flowed into the U.S. startup ecosystem, with several innovative companies securing substantial funding across a variety of industries.

From AI-driven platforms transforming banking and legal tech to advancements in robotics, cybersecurity, and defense, these startups are driving major change.

This surge in funding reflects the increasing demand for technologies that improve efficiency, streamline operations, and push the limits of what’s possible in both commercial and government sectors. Below, we take a closer look at some of the standout U.S. startups capturing attention with their groundbreaking innovations and impressive funding rounds.

Mercury

Founders: Immad Akhund, Jason Zhang and Max Tagher

Mercury, founded in 2019 by Immad Akhund, Jason Zhang, and Max Tagher, provides a banking platform tailored to startups, offering automated cash flow management, seamless integrations, and financial tools for high-growth businesses. The company has grown rapidly, processing over $156 billion in annual transactions and serving 200,000+ business customers. Mercury raised $300 million in a Series C round led by Sequoia Capital, doubling its valuation to $3.5 billion. With consistent profitability for 10 consecutive quarters, the company is well-positioned for future expansion and potential IPO, while continuing to innovate with products like Mercury Treasury, Mercury Venture Debt, and Mercury IO.