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Growth in numbers and knowledge

1976Gerd Overlack and John Sitt establish Sitt & Overlack GmbH in Cologne.
1981The company is expanded with the acquisition of Inter-Assekuranz Versicherungsmakler GmbH of Cologne, which was established in the late 1950s, a specialist insurance broker for the insurance of heavy lift cargo and hook-load risks (mobile cranes, vehicle recovery firms) and originators of the boom overload coverage.
1987Both brokers are taken over by the London-based Sedgwick Group and the private bank Merck Finck & Co. of Munich. The Interassekuranz Sitt, Overlack & Co. GmbH emerges from the following merger of the two broker firms, still under the management of Gerd Overlack and John Sitt. Customer service is continued in Germany within the network of Europe's largest insurance broker under the umbrella of the Sedgwick Group.
1995The two affiliates of the Sedgwick Group in Germany merger into Sedgwick GmbH & Co. From now on, the core business of the Interassekuranz Sitt, Overlack & Co. GmbH is operated under the company name Interassekuranz Sitt, Overlack & Co. branch of the Sedgwick GmbH & Co.
1999In the course of the take-over of the Sedgwick Group of London by the New York-based Marsh Group, the managing directors and former owners Gerd Overlack and John Sitt acquire the book of business of the branch office Interassekuranz Sitt, Overlack & Co. The continuous customer service is led into the next millennium under the company name Interassekuranz Sitt & Overlack AG.
2006The Ecclesia Group acquires the capital shares of John Sitt and Gerd Overlack. Since then, the company's name has been Sitt & Overlack GmbH.
2019The Hemmer & Felder GmbH (until then a minority shareholding of the Ecclesia Group) is fully taken over by the Ecclesia Group and merged with Interassekuranz Sitt & Overlack GmbH.