More than 25 years of experience

The selected companies provide insight into the diversity of operational and strategic roles that the founder of Marktflagge has taken on over the past 25 years. At the same time, they provide an overview of Marktflagge's range of holdings and the breadth of the portfolio in terms of sectors.

For more information, please click on the respective company.

attractix Logo

The start-up is revolutionizing ticket sales for museums, attractions and leisure activities through a dynamic pricing solution with the highest level of usability based on an e-commerce platform.

Sebastian Stietzel supports the company as an advisor and investor.

Synbiotic Logo

The listed European stock corporation initially targeted international portfolio companies with the goal of establishing novel cannabinoid-containing products on the market as an alternative to classic medicines. In the context of govermental plans to legalize cannabis consume, the focus changed to the full value chain of the hemp plant.

Sebastian Stietzel was the founding CEO of the company in 2020 and moved to the Board of Directors after setting up the structures and realizing the first M&A transaction. From 2021 to 2023, he has been responsible for the various capital increase and M&A activities as Chairman of the Board of Directors.

The New Meat Company

The publicly listed company pursues a buy & build strategy for the development of a platform for meat alternatives.

Sebastian Stietzel supported the restructuring of the former operations as well as the repositioning of the company. He has been a member of the Supervisory Board since 2019 and was significantly involved in the acquisition of the first portfolio companies and the capital market-side setting of the company with a new CEO.

Lumaland AG

The stock listed group of companies pursued a Buy&Build strategy in the area of Home&Living products in e-commerce.

As a member of the Management Board for Operations (COO), Sebastian Stietzel was responsible for Finance, Human Resources, Shared Services, Legal & Capital Markets as well as the M&A process and post-merger integration of several portfolio companies from 2017 to 2019.

The Social Chain

The publicly listed group was formed in 2019 through the merger of two company groups with a focus on the social media marketing of its own e-commerce articles.

As a member of the Executive Board and authorized signatory, from 2019 to 2021 Sebastian Stietzel was cross-departmentally responsible for post-merger projects & management performance as well as supporting preparations for the group’s uplisting to the Prime Standard of the Frankfurt Stock Exchange.

In 2023, he was a member of the Supervisory Board of the company.


As a spin-off of creative-technical-visions, the company was the developer and provider of the full-service ticketing solution with the same name for events of all kinds with seating plan booking, box office billing, season ticket function, individual store design and nationwide distribution network! TiXOO was also the first mover for print@home tickets in Germany.

Sebastian Stietzel led the company from 2008 to 2016 as majority shareholder and CEO.

ctv logo

During the internet boom, the company was a specialist for software development with a focus on web-based database solutions for internationally oriented customers of various sizes..

As co-founder and CEO from 1998 to 2008, Sebastian Stietzel was responsible for the strategic development and commercial management of the company.