# Stemas

Stemas is a Private Equity based in Munich, Germany.

## Overview

- **Organization type:** Private Equity
- **Headquarters:** Munich, Germany
- **Region:** Europe
- **Address:** Brienner Str. 7, 80333 München, Germany
- **Founded:** 2003
- **Assets under management:** Undisclosed
- **Website:** www.stemas.de
- **LinkedIn:** https://www.linkedin.com/company/stemas-ag

## Regulatory record

- **Reports private funds:** No

## About

Stemas AG invests in mid-sized industrial companies, particularly where succession is unresolved, restructuring is needed, or carve-outs from corporations occur. It takes majority stakes and holds permanently with no planned exits. Focus sectors are electronics/electrical engineering, mechanical and plant engineering, and fire protection. Portfolio companies operate independently within the Stemas group while receiving strategic and financing support.

## Sectors

- Industrial Tech
- Electronics
- Machinery & Equipment
- Fire Safety & Security

## People

- Stefan Hasper — Member of the Management Board
- Thomas Müsch — Member of the Management Board

## Questions

### Who runs investment decisions at Stemas?

Stefan Hasper and Thomas Müsch, the two-member management board, make all investment and operational decisions. Hasper focuses on deal structuring and financing, while Müsch handles deal flow, operations, personnel, and controlling. Both are credentialed engineers with prior consulting careers at KPMG and Roland Berger, respectively.

### Does Stemas ever sell its portfolio companies?

No. Stemas explicitly states that a Weiterveräußerung — resale — of its holdings is not planned. The firm positions itself as a permanent owner for small and mid-sized German industrials, making it structurally distinct from traditional private equity funds that operate on fixed 5-to-10-year hold periods.

### What is Stemas’s relationship with GCI Management Consulting?

Stemas is the largest single shareholder in GCI Management, holding a reported 30 percent stake. GCI provides turnaround, restructuring, and M&A advisory services to mid-sized companies in the DACH region and serves as a proprietary deal-sourcing channel for Stemas. Stefan Hasper is also a managing director at GCI, where he leads the restructuring and M&A practice.

### How is Stemas governed?

The two-member management board is overseen by a three-member supervisory board: Dr. Achim Johannis (VALTEQ makon), Helena Vonholdt (former Taylor Wessing CSO), and Dirk Ostheimer (Global Assekuranz). The structure separates strategic oversight from day-to-day investment and operating work conducted by Hasper and Müsch.

## Related profiles

- [Stemar Capital Partners](https://altss.com/profile/stemar-capital-partners)
- [Stemcor](https://altss.com/profile/stemcor)

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Last updated: 2026-08-11T15:08:11.274Z

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