Dr. Alexander Stefan Rieger is widely recognized for advising clients on complex M&A transactions and projects in the international infrastructure and energy sector. The Legal 500 ranks him in 2022 and 2023 as one of the leading partners of the next generation for M&A in Germany. JUVE lists him as “frequently recommended” for M&A.

Mr. Rieger’s clients include leading infrastructure funds, pension funds, insurances, private equity investors, and corporates from around the globe.

By utilizing his background as a straight-forward infrastructure lawyer, Mr. Rieger adds value rarely available in the market at the interface between infrastructure and M&A. What Mr. Rieger does best: understanding complex industry specific issues and translating them into legal or commercial solutions.

In advising his clients, Mr. Rieger emphasizes practicality, striving to achieve his clients’ business objectives by leveraging his “perfect understanding of the market and related transaction dynamics” (The Legal 500 2023).

Mr. Rieger’s representative experience includes advising:

  • DIF Capital Partners on several transactions, including the: 
    • Investment in metrofibre, a platform to build out fiber networks across Germany
    • Investment ruhrfibre, a platform to build out a fiber network in the City of Essen*
  • InfraRed Capital partners on several transactions, including the:
    • Investment in and development of data center platform NexSpace
    • Investment in the German B247 road project*
  • UBS Asset Management and Northern Fiber Holding on several transactions, including the:
    • Acquisition of a fiber network from VXFiber*
    • Acquisition of LuneCom*
    • Acquisition of sewikom*
  • Digital Transformation Capital Partners (DTCP) on several transactions, including the:
    • Initial investment in maincubes* 
    • Acquisition of a majority shareholding in maincubes
    • Numerous portfolio transactions for maincubes 
  • NorthC Group on several transactions, including the:
    • Acquisition of IP Exchange*
    • Acquisition of Netrics Group*
    • Acquisition of a data center in Switzerland 
  • AtlasEdge, a JV between Liberty Global and DigitalBridge, on its acquisition of Datacenter One*
  • Intermediate Capital Group and TNG Glasfaser on the acquisition of fiber business sdt.net AG
  • DWS Group on its major investment in Deutsche GigaNetz*
  • iCON Infrastructure on the acquisition of Strategic Fiber Networks Group*
  • Alpha Capital Partners and Keppel Telecommunications & Transportation on the acquisition of a data center in Germany
  • IST3 Infrastruktur Global jointly with Allianz Capital Partners in a consortium with OMERS Infrastructure and AXA Real Assets on the successful acquisition of a 49.99% stake in the “fibre-to-the-home” (SFR FTTH) business of Altice France*
  • Versicherungskammer Group on the acquisition of Ferngas Group*
  • Encavis on the acquisition of a wind farm in Finland
  • CommerzReal on the acquisition of several wind farm projects
  • Greenvolt on its investment in solar developer MaxSolar*
  • John Laing Infrastructure Environmental Fund on the successful acquisition of various wind farms in France*
  • EEW Energy from Waste on the successful disposal of shares in the waste incineration plant Borsigstraße/Hamburg*
  • EVN AG on several transactions, including the:
    • Investment in a large-scale wastewater project in Kuwait*
    • Acquisition of shares in European Energy Exchange AG*
  • InfraVia Capital Partners and Egis Capital Partners on the disposal of their shares in the German A8 motorway*

*Matter handled prior to joining Latham

Bar Qualification

  • Rechtsanwalt (Germany)


  • Dr. iur., Goethe University, Frankfurt, 2010
  • Second State Exam, Higher Regional Court, Frankfurt, 2010
  • First State Exam, Goethe University, Frankfurt, 2006