Squared Circle Ventures

Squared Circle Ventures operates as a CISO-led microfund, investing in early-stage cybersecurity companies, often prior to product or revenue. The firm strategically supports ventures poised to shape the future of cybersecurity within the evolving post-cloud landscape. Their investment approach is informed by deep understanding of technical complexities and emerging threats.

The firm was established in 2025, with Karl Mattson at the helm, leveraging his extensive experience as a Chief Information Security Officer. Mattson's foundational insight was the need to empower next-generation cybersecurity innovators addressing challenges intensified by rapid technological change. This CISO-led perspective informs their selective strategy.

Squared Circle Ventures partners with early-stage cybersecurity companies, providing critical capital and strategic guidance to develop robust solutions. The firm’s overarching vision is to foster resilient and adaptive security technologies that effectively counter sophisticated, machine-speed threats. They aim to support enterprises building foundational layers of future digital defense.