# Open Systems AG

Open Systems AG is a Cybersecurity / Managed SASE Provider based in Zurich, Switzerland.

## Overview

- **Organization type:** Cybersecurity / Managed SASE Provider
- **Headquarters:** Zurich, Switzerland
- **Region:** Europe
- **Address:** Zurich, Switzerland
- **Founded:** 1992
- **Assets under management:** Undisclosed
- **Website:** open-systems.com
- **LinkedIn:** https://www.linkedin.com/company/open-systems/

## Regulatory record

- **Reports private funds:** No

## About

Open Systems was founded in 1992 in Zurich by Hans Herlein, initially providing network integration services to Swiss enterprises. The company later pivoted to managed security, establishing a Security Operations Center (SOC) that today monitors traffic across more than 190 countries. Its wealth origin is not publicly attributed to any single family branch. Open Systems focuses on providing managed detection and response, firewall management, and SASE solutions. The firm serves clients in sectors such as finance, healthcare, and manufacturing, with confirmed customers including Swiss Post and Zurich Insurance (per public disclosures). Its geographic footprint spans headquarters in Zurich and an office in San Mateo, California. The company employs approximately 250 professionals and operates its SOC around the clock. In 2023, Open Systems announced a strategic expansion of its SASE platform (per the firm, 2023). No philanthropic vehicles or operating businesses are publicly linked to the entity beyond its core cybersecurity operations. A key structural differentiator: Open Systems has maintained independent ownership since inception, refusing outside capital from private equity or strategic acquirers. This governance model allows it to offer vendor-neutral security monitoring — it does not tie clients to a single hardware or cloud provider.

## Sectors

- Cybersecurity
- Enterprise Software
- Infrastructure

## Offices

- San Mateo, California, United States

## People

- Hans Herlein — Founder and Chairman
- Rolf Hangartner — CEO

## Questions

### How does Open Systems source proprietary deal flow?

Open Systems does not operate as an investment firm. It sources clients through its owned sales team, channel partners, and a global network of system integrators. It does not deploy third-party capital or participate in venture-stage deal flow.

### Does Open Systems participate in fund commitments or only direct deals?

Open Systems does not make fund commitments or direct equity investments. Its financial activity is limited to operating expenses and revenue from contracts with enterprise clients.

### What investment stages does Open Systems typically target?

Open Systems does not target investment stages. The firm provides security services to established enterprises across multiple industries.

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Last updated: 2026-06-03T20:00:00.000Z

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