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Legal Advisory and Services

At Siller Legal we support organizations in addressing regulatory, transactional and governance challenges through a clear and integrated advisory platform. Our work combines compliance expertise, transaction advisory capabilities and legal services delivered through our partner law firms, enabling clients to form well‑grounded decisions and manage risk with discipline. This approach brings governance, compliance and legal perspectives into one coherent framework that strengthens control, enhances transparency and supports resilient business performance.

Our Platform

We bring together strategy, digital innovation, compliance expertise and legal capabilities in a single integrated platform that enables clients to navigate complex decisions with absolute clarity. Our advisory model concentrates all essential competencies in one place, ensuring consistency, precision and a seamless flow of information across every phase of a project. By combining our internal strengths with the specialist legal knowledge of our partner law firms, we deliver a unified experience that maintains the highest professional standards and creates measurable value in even the most demanding regulatory and transactional environments.

Our Capabilities

At Siller Legal we integrate governance, compliance, transaction advisory and legal execution through partner law firms. Advisory work is delivered by Siller GmbH and all legal services are provided by our partner attorneys.

Compliance & Transaction Advisory

We structure the commercial terms, operating models and documentation frameworks from an economic and governance perspective. We do not issue legal opinions or perform attorney work; all legal services are delivered by partner law firms.

We design governance structures that clarify decision rights and accountability to support reliable execution.


We translate regulatory change into practical operating models, ownership and measurable controls.


We build privacy processes and governance aligned with data‑lifecycle risks, without issuing legal opinions.


We integrate ESG into governance and reporting with clear metrics and execution readiness.


We develop risk‑based, auditable control systems that strengthen organizational integrity.


We support deals with commercial analysis, preparation and execution discipline; legal elements are handled by attorneys.


We produce decision‑ready findings on markets, operations and sustainability fundamentals.


We curate data, normalize inputs and prepare documentation to accelerate the diligence process.


We coordinate the transaction program and maintain a unified decision record, while legal drafting is performed by partner law firms.


Deliverables

  • Governance frameworks defining decision rights, accountability and escalation
  • Regulatory impact assessments translated into operating models and controls
  • Compliance ownership matrices and auditable control documentation
  • Data protection and privacy governance processes aligned to data‑lifecycle risks
  • ESG governance models, metrics and reporting readiness frameworks
  • Enterprise risk registers and integrity‑focused control systems
  • Commercial M&A analysis and transaction preparation materials
  • Commercial, operational and ESG due diligence reports
  • Pre‑deal data room structuring and diligence‑ready documentation
  • Transaction governance frameworks and unified decision records
  • Coordination of transaction documentation with legal drafting by partner law firms

Who Benefits

  • Boards and executive teams
  • Strategy and corporate development units
  • M&A and transaction teams
  • Risk, compliance and integrity officers
  • General counsel and in‑house legal teams
  • ESG and sustainability leads

Siller Academy

While our consulting projects deliver concrete strategies and models, Siller Academy extends this work into capability building, ensuring that teams gain the skills and understanding to implement what we design together.

Explore Siller Academy

Legal Services

(delivered exclusively by partner law firms)


Our partner attorneys provide legal counsel across corporate, commercial, regulatory and transactional matters. Siller GmbH manages coordination; all legal opinions, drafting and representation are executed exclusively by licensed law firms.

Partner attorneys advise on corporate structures, shareholder arrangements and ongoing governance so decision rights, controls and reporting lines are unambiguous. The result is legal robustness that scales with growth and withstands regulatory and investor scrutiny.


Lawyers structure and draft agreements and lead negotiations to align legal terms with the commercial model. Clear risk allocation, remedies and performance obligations reduce disputes and shorten time to signature.


Specialist counsel issue legal opinions and prepare submissions to market authorities and system operators on licensing, grid access and market participation. Clients gain formal clarity on regulatory exposure and a clean pathway to operate or expand in energy markets.


Partner firms provide end to end legal counsel from deal structuring through signing and closing mechanics. Transaction documentation is aligned with value drivers and closing conditions, reducing execution risk and post‑deal friction.


Attorneys perform corporate, regulatory and contractual diligence to map liabilities, consents and change‑of‑control issues. Findings are prioritized by materiality and linked to mitigation steps and transaction documents.


Legal teams draft and negotiate SPA, SHA and TSA so warranties, covenants and transition services fit the deal model and integration plan. Precision in definitions and processes protects value and accelerates day one readiness.


Litigation and arbitration counsel assess positions, design case strategies and manage proceedings toward efficient resolution. The focus is preserving commercial outcomes while controlling legal and reputational risk.


Specialist attorneys advise on employment frameworks, works council topics and workforce transitions. Proper sequencing of notices, consultations and documentation safeguards compliance and operational continuity.


Deliverables

  • Corporate and group structuring memoranda
  • Shareholder, governance and control documentation
  • Commercial contract structuring, drafting and negotiation support
  • Regulatory legal opinions and authority filings
  • Transaction structuring and closing mechanics documentation
  • Legal due diligence reports with risk prioritization
  • SPA, SHA and TSA drafting and negotiation packages
  • Dispute strategy memoranda and case management documentation
  • Employment, labor and workforce transition documentation

Who Benefits

  • Boards and executive management
  • General counsel and in‑house legal teams
  • Strategy and M&A units
  • Investors and transaction sponsors
  • Regulatory and compliance stakeholders
  • HR leadership and works council interfaces

Siller Academy

While our consulting projects deliver concrete strategies and models, Siller Academy extends this work into capability building, ensuring that teams gain the skills and understanding to implement what we design together.

Explore Siller Academy

Meet Our Legal Advisory Leaders

László Siller

László Siller

László Siller

 Managing Partner, Valuation & Strategy 

Kasper Walet

László Siller

László Siller

 Partner, Legal, Compliance & Risk 

Our Work in Action

Explore a selection of our recent projects that reflect how Siller applies analytical thinking and practical expertise to complex business challenges.

Our Work

Insights, Reports & Research

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Business and Management Consulting Services

We combine classic consulting expertise with decision-science to help leaders make better choices and achieve lasting impact. We are recognized for providing independent, objective valuations of companies and projects that give leaders the clarity and conviction to act decisively.

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Siller — Established 2015 Austria


Company Name: Siller Handels GmbH

Address: Gemeindeweg 47, 3422 Altenberg, Austria

Company Register Number: FN 442495 d

VAT Number: ATU69992868

info@siller.gmbh


Siller is the consulting brand of Siller GmbH.


Siller GmbH is a limited liability company under Austrian law. The information provided on this website is for general informational purposes only and does not constitute professional advice. Siller GmbH accepts no liability for any actions taken based on this information. 


© 2015–2026 Siller GmbH. All rights reserved.

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