Mahmut Nedim Umur

Doganlar Yatirim Holding AS is a private company based in Istanbul, Turkey that offers quality, modular, and functional furniture at affordable prices through their online platform Ruumstore.com. The Turkish company is committed to a sustainable future through their technology, human resources, and production capabilities. The company has nine different brands in various sectors, including Biotrend Enerji, which was established in 2017 with the goal of becoming a production and application center for alternative energy production and technology in Turkey.

Part of Doganlar Yatirim Holding AS, Maven Enerji Elektrik Uretim Sanayi Ve Ticaret AS generates electricity. The company is based in Istanbul, Turkey.

Umur Kirtasiye San ve Tic AS is a Turkish company that supplies stationery products. The private company is based in Istanbul, Turkey.

Çalik Holding AS manages and coordinates the activities of its subsidiaries. It operates through the following segments: Energy, Construction, Textile, Marketing, Telecommunication, Banking and Finance, and Other. The Energy segment involves in the sale of electricity; operation of natural gas and crude oil resources; exploration and production of resources; and sale and transportation of resources to international markets. The Construction segment operates in construction, contracting, and decoration businesses. The Textile segment produces and trades yarn, texture, and ready wear products. The Marketing segment supplies goods that are used in the production and the domestic or foreign projects carried out mainly by the group entities. The Telecommunication segment provides communication, press, and internet services. The Banking and Finance segment offers commercial and investment banking, financial leasing, insurance, project financing trading of marketable securities, and credit financial services. The Other segment includes electronic fee collection, organization, mining, and transportation energy license procurement. The company was founded by Ahmet Çalik on March 20, 1997 and is headquartered in Istanbul, Turkey.