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Dr Jan Henning Martens

Rechtsanwalt (Lawyer) and Partner

Freiburg

Certified Specialist in Corporate and Commercial Law

Dr Jan Henning Martens has been working as a lawyer in our Freiburg office since 2010 and became a partner in 2017. He primarily advises clients on corporate law, M&A transactions, and venture capital financing, including in the start-up sector. He also advises on trade and distribution law, international business law, medical device and pharmaceutical law, export control and customs law, and compliance issues.

Languages

  • German
  • English
  • French
  • Portuguese
  • Swedish

Contact

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Practices

Awards

Handelsblatt & Best Lawyers 2026 Leaders League 2026 JUVE Handbook of Commercial Law Firms 2025/26

Publications

  • EU-Sanktionen gegen Russland – Überblick und Handlungsmöglichkeiten deutscher Unternehmen (EU-Sanktionen gegen Russland – Überblick und Handlungsmöglichkeiten deutscher Unternehmen), BB 13.2022, p. 707 et seq. (together with Dr. Stephan Fischer)
  • Vertragliches und nachvertragliches Wettbewerbsverbot für GmbH-Geschäftsführer, Teil 2 (Contractual and post-contractual non-competition clauses for limited liability company managing directors, part 2), GmbH-Steuerpraxis 2020, issue 11, p. 329 (together with Stefan Lammel and Tina Bieniek)
  • Vertragliches und nachvertragliches Wettbewerbsverbot für GmbH-Geschäftsführer, Teil 1 (Contractual and post-contractual non-competition clauses for limited liability company managing directors, part 1), GmbH-Steuerpraxis 2020, Issue 10, p. 293 (together with Stefan Lammel and Tina Bieniek)
  • Co-author of the handbook Manz/Mayer/Schröder: Die GmbH (1st ed., Haufe Verlag 2020)
  • Schlichtungs-, Mediations- und Schiedsverfahren für die GmbH (Conciliation, mediation and arbitration proceedings for the German limited liability company), together with Stefan Lammel and Tina Bieniek, GmbH-Steuerpraxis 2020, issue 1, p. 14
  • Gesellschafterstreitigkeiten in der Personengesellschaft, insbesondere der GmbH & Co. KG, Teil 2 (Shareholder disputes in the partnership, in particular the limited partnership with a private limited company as general partner, part 2), together with Stefan Lammel and Tina Bieniek, GmbH-Steuerpraxis 2019, issue 5, p. 139
  • Gesellschafterstreitigkeiten in der Personengesellschaft, insbesondere der GmbH & Co. KG, Teil 1 (Shareholder disputes in the partnership, in particular the limited partnership with a private limited company as general partner, part 1), together with Stefan Lammel and Tina Bieniek, GmbH-Steuerpraxis 2019, Issue 4, p. 112
  • Die Treuepflicht des GmbH-Gesellschafters (The duty of loyalty of the GmbH partner), together with Dr. Stefan Lammel and Tina Bieniek), GmbH tax practice 2018, 170
  • Das Ausscheiden des Gesellschafters aus der GmbH (The resignation of the shareholder from the GmbH) (jointly with Dr. Stefan Lammel and Tina Bieniek), GmbH-Steuerpraxis 2018,37
  • Compliance-Management-Systeme sind bei der Bußgeldbemessung nach § 30 OWiG zu berücksichtigen (Compliance management systems are to be taken into account in the assessment of fines according to § 30 OWiG), note on BGH, judgement of 09.05.2017,1 StR 265/16 (together with Dr. Moritz Jenne), CCZ 2017, 285
  • Die Besteuerung des GmbH-Gesellschafters bei Wegzug ins Ausland [The Taxation of a GmbH-Partner after a Move Abroad] (together with Stefan Lammel), GmbH-Steuerpraxis 2016, 71.
  • Die “Wegzugsbesteuerung” der GmbH ins Ausland [The Exit Taxation of a GmbH Abroad] (together with Stefan Lammel), GmbH-Steuerpraxis 2016, 167.
  • Hürden für Schadensersatz nach Unternehmenskauf [Barriers for Claims for Damages after Business Acquisitions], Platow Recht No. 129, p.7 (together with Barbara Mayer)
  • Nicht-Entlastung wegen unentschuldigter Pflichtverletzungen der Geschäftsführung [Non-discharge of Management due to Unexcused Violation of Duty] – comment on OLG Munich, decision dated 22 July 2015, file no. 7 U 2980/12 (together with Barbara Mayer), IWRZ 2015, p. 30 et seq.
  • Neue Anforderungen an Rangrücktrittsvereinbarungen mit einer GmbH [New Requirements with Regard to Subordination Agreements with a German Limited Liability Company] (together with Dr. Ingo Reinke and Dr. Stefan Lammel), GmbH-Steuerpraxis 2015, p. 258 et seqq.
  • Die Haftung des Kommanditisten in der GmbH & Co. KG [The limited partners’ liability in the GmbH & Co. KG] together with Dr. Stefan Lammel, GmbH-Steuerpraxis 2014, 201 et seq.
  • Managementstrukturen in der SPE [Management Structures in European Private Companies (SPEs)], Frankfurt am Main 2013
  • Wettbewerbsverbote in der GmbH [Restraints of Competition in German Private Limited Liability Companies (GmbHs)] together with Dr. Stefan Lammel, GmbH-Steuerpraxis 2013, 44 et seq.
  • Absolute Geltung des Aufrechnungsverbotes nach § 393 BGB [The Absolute Application of the No Set-Off Rule under Paragraph 393 German Civil Code (BGB)], StudZR 2010, 147-158
  • Regular author of up-to-date articles for Haufe-Steuer Consultant
  • Co-author of Haufe-Datenbank zum Gesellschaftsrecht [Haufe’s Database on Company Law]
Overview

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