Adler Group S.A. is a Luxembourg-based real estate holding company with numerous subsidiaries (Adler Group) mainly operating in Germany. It specialises in the management and development of income-producing, multi-family residential real estate. Adler Group owns and manages 17,504 residential rental units, largely concentrated in Berlin (around 99% of properties). Most of the properties fall into the market segment of affordable housing. 

Besides the residential rental portfolio, Adler Group owns a portfolio of development projects located in some of the largest cities of Germany. Adler Group does not intend to hold them but rather to generate cash flow and earnings through either forward sales or upfront sales. 

As of 31 December 2025, Adler Group had 337 employees based in Luxembourg and in several locations across Germany.