AI agent data security firm Sentra completed a $150 million Series C funding round led by Capital One Ventures, with participation from existing investors Bessemer Venture Partners, Zeev Ventures, Standard Investments, Munich Re Ventures, and Key1 Capital. Capital One will appoint a representative to Sentra's board. The company reported more than 300% year-over-year growth over the past year. The new capital will fund expansion of its AI agent data access governance, control capabilities, and data-at-rest protection, as well as entry into new markets. Sentra's total funding now exceeds $250 million.