029 Group SE, an investment holding company, operates as an investment platform for real estate, hospitality, and lifestyle sectors in Germany. Its platform includes aethos.com, a European collection of hotels and clubs; eterniti.com/emeraldstay.com/bo-house.com, a B-Corp vacation rental operator; and myne-homes.com, a co-ownership platform enabling access to luxury vacation homes. The company also invests in and develops land projects; invests in nursing living properties; and develops residential lands. It operates under the Limestone Capital, Periskop, HotelBird, Brother's Bond, and fjör brands. The company was formerly known as Mendarion SE and changed its name to 029 Group SE in August 2022. The company was incorporated in 2018 and is based in Berlin, Germany.