Rudolf Tschäni advises on M&A-transactions and questions of corporate governance, he is often sought for by board of directors and management in takeover and stress situations. Furthermore, he has extensive experience as board member and is often nominated as arbitrator in national and international arbitration procedures, in particular in disputes relating to mergers and acquisitions. Chambers Global and Chambers Europe recognized him as the only "Star Individual" in Switzerland during many years and quote him as "a brilliant lawyer with an enormous track record" as well as "strategic mastermind". Who is Who Legal Switzerland names him a "superstar in M&A" and in 2020 granted him the Lifetime Achievement Award for M&A and corporate governance. He advised the board of directors and the management of Sika AG during its multi-year defense against Compagnie de Saint-Gobain SA, and Alpiq and its board of directors in its dispute with Bouygues as well as the majority shareholders of Roche Holding AG in connection with the repurchase of Roche shares from Novartis Holding AG.