 Stratec partially listed its shares on the SWX Swiss Exchange through an initial public offering six years later, while Synthes USA and Mathys remained in private hands.Three years later, however, Stratec and Synthes USA merged to form a new publicly traded company named Synthes-Stratec.After the merger Hansjörg Wyss became, and remained (until the sale to Johnson & Johnson) the majority shareholder of the enlarged company.