Riethmüller, Arno

• Partner at WACH UND MECKES. • Expert in complex high-volume arbitration. • Listed in Who’s Who Legal (WWL) as Arbitration Future Leader, Leaders League (International Arbitration and Commercial Litigation) and Best Lawyers (International Arbitration / Arbitration and Mediation / Litigation). • Experienced in advising and representing German and international clients in both domestic and international arbitration under the auspices of institutional rules as well as ad hoc arbitration. • Arbitrator in institutional and ad hoc arbitration. • Specialized in Post-M&A disputes, disputes in the energy sector as well as in commercial and financial disputes.

• Partner at WACH UND MECKES since January 2022.
• Senior Associate at WACH UND MECKES, February 2020 to December 2021.
• Associate at WACH UND MECKES, August 2019 to January 2020.
• Associate at Cleary Gottlieb Steen & Hamilton LLP, Litigation and Arbitration Group, Frankfurt am Main, January 2016 to June 2019.
• Legal clerk (Rechtsreferendar) at Cleary Gottlieb Steen & Hamilton LLP, Litigation and Arbitration Group, Frankfurt am Main and New York City, June 2014 to September 2015.
• Research Assistant at the University of Freiburg, Germany, Institute for German and Foreign Civil Procedural Law (Dept. II), October 2013 to May 2015.

• Dr. Arno Riethmüller regularly acts as arbitrator, arbitral secretary and party representative in both national and international arbitration proceedings. • His practice includes: • Single arbitrator in proceedings under DIS arbitration rules (Post-M&A dispute; seat Munich). • Party-appointed arbitrator in ad-hoc-proceedings (shareholder dispute; German seat). • Representing a US-based global private equity investor in a dispute with the buyer of a security technology company in connection with a high three-digit million euro M&A transaction (DIS arbitration, seat Munich). • Representing a private equity fund in the defense of claims in the mid seven-figure range arising from a managing director's participation following the takeover and sale of a company in the food chemicals sector. • Representing an international manufacturer of device components in a Post-M&A dispute with subsidiaries of a Japan-based international engineering corporation relating to a purchase price adjustment and in asserting eight-figure damages due to breaches of the SPA (DIS arbitration, seat Frankfurt am Main). • Representing a private equity investor in a Post M&A dispute with the buyer of an international packaging company concerning a purchase price adjustment relating to foreign state subsidies (DIS arbitration, seat Munich). • Representing an Italy-based international insurance company in a Post-M&A dispute with an international investment bank in asserting claims for damages due to breaches of the SPA in a multibillion amount (Swiss Rules arbitration, Swiss and Italian law, seat Zurich). • Representing a US-automotive supplier in a nine-figure dispute with a listed German industrial group in connection with a long term supply agreement (DIS arbitration, seat Dusseldorf). • Representing a Middle Eastern state petroleum company in an eight-figure dispute in connection with a construction engineering project (ICC arbitration, CISG and corresponding state law, seat Geneva). • Representing an Austrian natural gas company in an eight-figure dispute in connection with long-term gas transportation contracts (ICC arbitration, Austrian law, seat Vienna). • Representing a Swiss-based international service provider and trade corporation in a dispute with a German subsidiary of a Japan-based pharma corporation relating to a long-term supply agreement for pharmaceutical substances (ICC arbitration, seat Austria, and annulment proceedings before the Austrian Supreme Court). • Representing the Agfa-Gevaert Group in a nine-figure Post-M&A dispute in connection with the sale of the company’s former consumer imaging division (ICC arbitration, seat Frankfurt am Main). • Representing Engie Electrabel in a nine-figure dispute with PreussenElektra/E.ON in connection with the Belgian and German nuclear tax (ICC arbitration, seat Geneva). • Representing a service provider in the pharmaceutical industry in a Post-M&A dispute with the seller of a pharma company relating to earn-out (DIS arbitration, seat Munich).

• Riethmüller, Der Beweiswert und die Verwertbarkeit von Whistleblowerangaben im Kartellverfahren (The Evidentiary Value and Utilization of Whistleblower Information in Antitrust Proceedings), 2018.
• Enforceability of Foreign Arbitral Awards in Germany, Transatlantic Law Journal (TLJ), 2023, 132, together with Leli Krachtis
• „The Munich PO1“: Muster einer Verfahrensleitenden Verfügung Nr. 1 in DIS-Schiedsverfahren mit Schiedsort Deutschland, SchiedsVZ 2024, 29, together with Frank Meckes, Dr. Karl J. T. Wach und Quirin Thomas
• IBA Arbitration Guide – Germany 2024, together with Maximilian Menz and Marios Kourtis (in publication)

• Bar Association Munich, Germany
• DIS
• DIS40
• Young ICCA
• DAJV

• Dr. Arno Riethmüller teaches as a visiting lecturer at the University of Heidelberg since April 2018 and at the Higher Regional Court District of Munich as part of legal clerkship since July 2023. • He is actively involved in Moot Courts and regularly sits as an arbitrator at the All Munich Rounds (Willem C. Vis International Commercial Arbitration Moot).