Castle Receives $2M in Seed Financing

Castle LogoCastle, a San Francisco, CA-based zero-configuration solution for account takeover (ATO) protection, received $2m in seed financing.

The round was led by First Round Capital with participation from F-Prime Capital, FundersClub and angel investors.

The company intends to use the funds to expand operations.

Led by Johan Brissmyr, CEO and co-founder, Castle provides companies of all sizes with a security platform to prevent account takeover by analyzing individual user behavior and isolating potential threats with minimal false positives.
Since graduating from Y Combinator six months ago, the company has detected and mitigated more than 250,000 accounts across 15 million users from potential security threats. Hundreds of online applications are utilizing Castle, including e-commerce leader Rue La La.



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