HomeUSACastle Raises $9.2M in Series A Funding

Castle Raises $9.2M in Series A Funding


Castle Founders Johan Brissmyr and Sebastian Wallin
Castle, a San Francisco, CA-based user identity company, raised $9.2M in Series A funding.

The round, which brought total funding to almost $12m, was led by Index Ventures, with participation from existing investors Y Combinator, First Round and F-Prime Capital Partners, angel investors Zack Urlocker, former COO at Duo Security, René Bonvanie, CMO at Palo Alto Networks, and Olivier Pomel, CEO at Datadog. In conjunction with the funding, Shardul Shah, partner at Index Ventures, will join Castle’s board of directors.

The company intends to use the funds to continue to expand operations and its development efforts.

Co-founded by Johan Brissmyr and Sebastian Wallin, Castle offers an end-to-end solution for user security and account takeover (ATO) prevention. Developers use its APIs to detect automated credential stuffing attacks and human-powered ATOs, and automate the recovery process.
The goal is that by embedding Castle into all online applications, the use of passwords and other security measures will be eliminated.