Valuation : $ 4.7bn Michelle Drolet specialises in cybersecurity , cloud , and virtual CISO services businesses . Drolet grew up in a military family and went on to earn a degree in Political Science and Criminal Justice . Drolet ’ s initial dream career was with the FBI , however , once the PC revolution hit , she witnessed the rampage of Trojan viruses and malware , so eyed opportunities applying forensics , mitigation and security services to desktops , networks and people . She used her expertise to establish Towerwall as a marketleading cybersecurity service and solution provider in 1999 . In 2019 , she was recognised as one of the Top 25 Women in Cybersecurity by The Software Report and as one of the Top CEOs to Watch in 2020 by CIO Views .

Valuation : $ 5.3bn

Founded by Eugene Danilkis in 2011 , Mambu is technically classed as a fintech challenger , but it ’ s essentially a German software company that provides infrastructure for banks and financial services companies according to the Software-as-a- Service ( SaaS ) model .

In December 2021 , Mambu reached a company valuation of $ 5.3bn , making it one of the biggest unicorns in Germany . Mambu is a SaaS , cloud-native , API-driven banking and financial services platform

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