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CMS Reich-Rohrwig Hainz Rechtsanwälte GmbH

Work +43 1 40 44 30
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Aberdeen, Algiers, Amsterdam, Antwerp, Barcelona, Beijing and 68 more

Mag Johannes Trenkwalder

Work +43 1 40443 1750

Work Department

Corporate / M&A, Energy


Johannes Trenkwalder is a partner at CMS in Vienna and a member of our transactions team. He is an experienced specialist in national and international transactions and since 2000 he has been advising clients in Austria and across the entire CEE region on their M&A activities.
He is also head of the energy sector group  and has advised on numerous transactions in the energy field. His primary areas of specialisation are projects on renewable energy, energy infrastructure and energy efficiency.
Johannes  has been running the CMS Reich-Rohrwig Hainz Kyiv office since 2009 and during this time he has advised numerous foreign companies on their Ukraine investment projects.
In addition, Johannes  is author of numerous specialised publications in fields such as corporate law and company acquisitions.


Assistant professor at the Vienna University of Economics and Business Administration for a corporate law-related research project (2002/03), CMS Reich-Rohrwig Hainz since 2000 (senior attorney since 2005, partner since 2010), guest lecturer at the College of Business Administration (Vienna), co-author of the leading commentary on the Austrian Takeover Code and various publications on corporate law issues


German, English


Austrian Bar Association


University of Innsbruck (Mag. iur., 1998); University of Manchester (LL.M., 2000), admitted to the Austrian Bar (2005)


Commercial, corporate and M&A

Within: Commercial, corporate and M&A

CMS' strength lies in providing assistance with M&A transactions, while also advising on the full corporate life cycle. Managing partner Peter Huber, who jointly heads the team with Rainer Wachter, advised Johnson & Johnson on the sale of a large business across various jurisdictions, and Clemens Grossmayer assisted TowerBrook Capital Partners with the acquisition of Schweighofer Fiber, and, together with the firm's Budapest office, Alexander Rakosi advised the Austrian packaging group Alpla on the acquisition of all shares in Greek company Argo. Johannes Trenkwalder is another key individual.

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Projects and energy

Within: Projects and energy

Working in close co-operation with other departments such as public procurement, real estate and construction, CMS' public procurement head Bernt Elsner advised Strabag and its joint venture partner Salini Impregilo on various matters pertaining to the construction of the main section of the Brenner tunnel, a 55km railway tunnel between Austria and Italy, and head of infrastructure and projects Thomas Hamerl is advising the regional government of Lower Austria on the development of a broadband glass fibre network. Johannes Trenkwalder is the main contact for energy sector work.

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Within: Energy

CMS is 'still the market leader', according to one client. Practice heads Vitaliy Radchenko and Johannes Trenkwalder count Scatec Solar and McKinsey among their clients. Senior associate Volodymyr Kolvakh is also noted.

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Legal Developments by:

  • Access to justice: protective costs orders in planning challenges

    Third parties and competing developers have no rights of appeal to the Secretary of State against planning decisions. Disappointed applicants can appeal to the Secretary of State and can have the merits of the application reconsidered. The only remedy available to a disappointed third party is a challenge by way of judicial review in the High Court on a point of law. The sense of frustration and disempowerment this creates has not been helped by the increasing complexity of the planning process and the use of consultation to legitimise decisions that many perceive may already have been taken.
    - CMS Group

Legal Developments in Austria

Legal Developments and updates from the leading lawyers in each jurisdiction. To contribute, send an email request to

    Good things come to those who wait? Finally, the main implementing regulation for the Austrian Law on Network and Information System Security ( Netz- und Informationssystemsicherheitsgesetz , " NISG ") was published last week. It serves primarily to define which companies are actually affected by the NISG. Now it is getting serious for the operators of " essential services ". What does that mean?
    - Dorda

    Black Friday is unquestionable one of the most profitable and busiest days of the year for retail, particularly online. Worldwide almost all online store do offer sales or special promotions on Black Friday or Cyber Monday. Already after this practice has established online, a trademark for " BLACK FRIDAY " was registered in Germany back in 2013. In 2016 a Chinese company acquired the trademark and then filed in 2017 for its extension to Austria. Based on the registered trademark, it granted exclusive rights to an Austrian company, which licensed usage rights to various partner stores against remuneration. Further, an exclusive " Black Friday-Cooperation Program " was established. Non-partners who used the event name or trademark were prosecuted and requested to either pay a license fee or refrain from running Black Friday promotions. Some followed the request and entered into license agreements. Some, however, did challenge the validity of the trademark. Finally, respective proceedings to check the actual protection of the trademark were initiated. Austrian courts now held that the trademark " BLACK FRIDAY " is not protected in Austria .
    - Dorda

    On 5th December 2018, the Austrian data protection authority ( Datenschutzbehörde , "DSB") issued a decision (DSB-D123.270/0009-DSB/2018) on data subject's right to data deletion according to Art 17 GDPR. In a nutshell, the DSB accepted consistent anonymisation as a valid alternative to physical and technical deletion. Beside the clear statement that anonymous data is not subject to the GDPR, the DSB provided detailed information on (technical) requirements of anonymisation methods:
    - Dorda
  • Consent or pay – a valid scheme under the GDPR?

    Media companies throughout Europe struggle with a difficult economic environment: Shrinking sales figures for print products, the digitalisation and consumer demand force publishers to offer their content also on the internet. However, generating money for online publications is not quite easy as – at least in Austria – online subscription against renumeration has not been well accepted by customers. This partially has its root in the lack of suitable micropayment means in the past and users thus getting acquainted to online information being offered for free. Thus, publishers have instead focused on financing their platforms by online marketing activities such as placement of banners. Nowadays such digital advertisement is usually targeted to the specific user. For this purpose, cookies are stored on the user's computer upon his first visit of the website, which then collect data about his location, technical equipment used and online behaviour. This finally allows to display specific, user targeted advertisements. However, such cookies may cause issues with applicable consent requirements under the telecommunication and data protection regulations:
    - Dorda
  • fwp expands know-how thanks to new junior partner

    Vienna, March 2019. Fellner Wratzfeld & Partner GmbH (fwp) adds valuable competence and expertise to the team by welcoming Pavel Bachleda in its midst as a new attorney-at-law and junior partner.
  • fwp helps find a new mega arena location

    fwp helps find a new mega arena location

    Processing operations subject to the requirement of a data protection impact assessment.
    - Dorda
  • Rien ne va plus!

    - Dorda
  • DORDA advises on the acquisition of Austrian office properties Denk Drei

    Stefan Artner , Partner and Head of the Real Estate Practice Group, and real estate attorney Klaus Pfeiffer of DORDA advised Austrian Real Estate Development GmbH ( ARE , a subsidiary of Bundesimmobilien-Gesellschaft, the Austrian privatization agency) on the acquisition of the Denk Drei office properties from IC Development . The successful closing of the forward purchase transaction took place on April 30, 2018. The parties have agreed not to disclose the purchase price.
    - Dorda
  • Austrian "White List"

    Exceptions from the OBLIGATION TO CARRY OUT A data protection impact assessment
    - Dorda