MILAN (Reuters) – High-end interior design group Design Holding, which is considering a possible market listing this year, said on Wednesday its revenues rose by 21% in 2021 as it expanded its portfolio with the acquisition of a Danish company. Pro-forma revenues in 2021 rose to just over 700 million euros ($742 million) and core earnings (EBITDA) were up 28% from a year earlier to 190 million euros, the group said in a statement shared with Reuters ahead of its official release. ($1 = 0.9438 euros) (Reporting by Silvia Aloisi and Valentina Za, editing by Giulia Segreti)