Salt Security, a Palo Alto-based API cybersecurity company, has raised $281 million in total funding to date. Its latest and largest round, a $140 million Series D in January 2022, was led by CapitalG with participation from Sequoia Capital, Y Combinator, and DFJ Growth, pushing its valuation to $1.4 billion. Earlier rounds include $70 million in Series C (2021) and $30 million in Series B (2020). Backed by elite investors and leveraging AI-driven threat detection, Salt Security is reshaping modern API protection for enterprises worldwide.