Series B is a later venture-capital funding round used to scale a company after it has early product and market traction. For cybersecurity vendors, this usually means expanding engineering, cloud infrastructure, sales, support, and compliance work so the product can handle more customers and more demanding environments.
In cyber security, a Series B round matters because it can accelerate defensive tools such as detection platforms, red-team software, and AI security testing. But funding is not proof of technical quality. Buyers still need to verify claims with pilots, benchmarks, reproducible findings, and independent review. In practice, the term signals that investors believe a security product has moved beyond a prototype, while defenders should still judge whether it actually improves resilience against real attacks.