top of page


To support your Corporate Finance / M&A project we will set up a team with the best combination of relevant skills, experience and contacts.

EXG's partners and associate / network partners have extensive experience in M&A / Corporate Finance, in company valuations, due diligence and strategy development or have set up / managed their own technology company.

Understanding the market drivers and drawing on our relationships to relevant players in the ICT industry help us take your project to success.

Dr. Sonja Legtmann
Managing Director/Founder

Dr. Sonja Legtmann is the founder and managing director of EXG. She has worked in Corporate Finance for more than 20 years and has realised a large number of company sales and acquisitions in Germany and internationally. Based on her extensive M&A experience in the ICT industry she has specific knowledge of the value drivers and market players in the technology and services sector and can draw on her relationships with ICT companies and investors.

Her main focus is on advising the shareholders of owner-managed ICT companies in realising their growth strategies mainly through the sale of a shareholding or the business to a strategic partner or to a financial investor.

Dr. Sonja Legtmann has a degree in Business Administration and PhD in Economic Sciences. She has worked for international investment and private banks in London, Vienna and Munich, was a managing partner of a Venture Capital company and has advised on numerous IPOs. Dr. Sonja Legtmann has initiated fund concepts, managed several investments in technology companies and was a member of the board of portfolio and group companies. Most recently she was the co-founder and managing director of a corporate finance consultancy firm.

Her working languages are German, English, French and Spanish. She is co-founder and Member of the Steering Committee of ICFN International Corporate Finance Network.

Where relevant, EXG Consulting works with its associated / network partners drawing on their longstanding experience in strategy development / due diligence / post-merger integration or their own entrepreneurial and management experience in the ICT industry.

Dr. Michael Hirt
Corporate Development / M&A / Strategy

Dr. Michael Hirt is an independent Corporate Finance and Corporate Development Advisor. He is the founder and Managing Director of HIRT&FRIENDS, a management consultancy business and Director of the Austrian Institute for Management Innovation. Dr. Hirt advises on strategy development, post-merger integration and on M&A transactions. He has excellent relations to Austrian mid-market companies as well as international corporations. Read more...

Anne Kössler
Sales Products People
Market strategies for Digital Products

Anne Kössler has extensive experience in business development and setting up sales channels for large technology companies. In her advisory work she focusses on developing new business models in the digital space, on go-to-market strategies and on implementing (international) direct & partner sales. Prior to starting her advisory activities Anne Kössler was Head of Sales Modern Workplace Public Sector / Automotive at Microsoft.   Read more ...

Christoph Sieger
Chartered Accountant
Due Diligence / Company valuation / M&A

Christoph Sieger is a Chartered Accountant and Tax Advisor and Managing Director of Sieger Wirtschaftsprüfer. One of his focus areas are Due Diligences and company valuations. He advises middle market companies and their owners on taxation and financial issues and Mergers&Acquisitions.

Michael Schuster
Management Consultant
Software-based Business Models

Michael Schuster supports in the evaluation and development of business models in the B2B software space from a technological as well as a market/sales perspective. He has longstanding experience in the development and marketing of B2B software as well as in realising smart production/IIoT concepts. Michael Schuster was a shareholder and managing director of GIB GmbH in Siegen.  Read more ...


EXG Consulting is a member of the international corporate finance network ICFN International Corporate Finance Network which was co-founded by Dr. Sonja Legtmann. ICFN’s member firms are selected M&A and corporate finance companies with excellent contacts in their local markets.

EXG Consulting regularly works with its international ICFN partners to realise cross-border transactions including amongst others:

Aitor Arteaga.jpg
Aitor Arteaga
BAUM Partners, Spain
Managing Director

Aitor Arteaga is a Corporate Lawyer, with a Degree in Laws by the UPV and Master in Legal and Tax Advisory. He is one of the founding members of BAUM partners, an independent legal and corporate advisory firm, specialized in supporting small and middle size industrial companies in their legal and financial affairs. Read more ...

Andrew Heitner
Alcon Partners, USA
Managing Director

Andrew Heitner is founder and director of Alcon Partners, a buy-side advisory firm that assists Private Equity firms and corporate M&A departments source and evaluate acquisition opportunities, with offices in Miami, Boston, and Vermont. He also owns Alcon Technology Consulting, Inc., a telecommunications firm based in Boston.  Read more ...

Marina Alberti
Studio Alberti, Italy
Chartered Accountant and Tax Advisor

Marina Alberti, tax advisor and chartered accountant, is Managing Partner of Studio Alberti, a tax advisory and audit company in Bolzano. Studio Alberti advises on taxation, legal and financial issues and supports companies in corporate and project finance as well as M&A transactions.   Read more ...

Bas Brusche
FACTOR, Netherlands
Managing Director

Bas Brusche is co-founder and managing partner of Factor Corporate Finance. FACTOR is an independent mid-market M&A boutique based in the Netherlands.   Read more ...

Daniel Rivera
Elit Capital, Brazil
Managing Director

Founding Partner of Elit Capital, Economist, with a Master in Business Administration by the Federal University of Rio de Janeiro (UFRJ) and a second Master in Business Administration by Getúlio Vargas Foundation (FGV). Mr. Rivera has extensive experience in Mergers and Acquisitions (M&A) processes through working in world-renowned companies such as Petrobras and Ernst & Young.   Read more ...

bottom of page