Yotam Segev served in the Israel Defense Forces' Unit 8200 and attended the Talpiot leadership academy. There he met Tamar Bar-Ilan, his future co-founder. In Unit 8200 he saw the data-security problems that operational security teams faced.
They founded Cyera in 2021 with Yonatan Itay. Less than a year later Segev demoed the product to a Fortune 500 security team in the Carolinas. He recalls the security chief's excited reaction as a favorite memory.
Cyera grew as companies rushed to feed data to AI systems and needed to know what data they held. It raised $300 million in April 2024 and another $300 million in November 2024. In June 2025 it raised $540 million at a $6 billion valuation.
A $400 million round led by Blackstone followed in January 2026. On 10 June 2026 Cyera raised a $600 million Series G at $12 billion. In July 2026 it agreed to buy Oasis Security for about $1 billion, a deal completed in September 2026.