Note - Oyster Security has now been merged into Fusang as of 2025 and is no longer operating. Oyster Security, a part of Portcullis Group was established in 2014 to support the cybersecurity governance for Portcullis Group of companies. It now seeks to provide a complete spectrum of cybersecurity knowledge and consultancy services to small and medium enterprises, family offices, private clients and high net worth individuals.
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The Oyster Security annual revenue was $3 million in 2026.
Oyster Security is based in Singapore, Central Singapore.