Administrative Procedure Law in German Competition Investigations

1. Introduction

Administrative procedure law plays a central role in German competition investigations because the Bundeskartellamt (Federal Cartel Office) exercises extensive investigative and enforcement powers while remaining bound by procedural guarantees protecting undertakings and other affected parties.

The principal framework is the Gesetz gegen Wettbewerbsbeschränkungen (GWB), particularly Part 3, Chapter 1, together with the general principles of German administrative law, constitutional guarantees under the Grundgesetz (GG), the EU Charter of Fundamental Rights, and, where EU competition law applies, Regulation 1/2003.

Section 54 GWB provides that competition proceedings may be initiated ex officio or upon application and expressly provides that, unless the GWB contains special rules, the general German administrative-procedure provisions apply.

The procedural framework therefore seeks to reconcile two objectives:

1. Effective detection and prosecution of anti-competitive conduct, particularly secret cartels; and
2. Procedural fairness, legality, proportionality, confidentiality and judicial protection for investigated undertakings.

2. Principal Sources of Administrative Procedure

The principal sources are:

A. German Competition Act — GWB

The most important procedural provisions include:

• § 54 GWB – initiation of proceedings and parties;
• § 55 GWB – preliminary determination of jurisdiction;
• § 56 GWB – hearing, access to files and oral proceedings;
• § 57 GWB – investigations and evidence;
• § 58 GWB – seizure;
• § 59 GWB – requests for information;
• § 59a GWB – examination of business documents;
• § 59b GWB – searches;
• § 60 GWB – interim measures;
• § 61 GWB – conclusion and reasoning of proceedings;
• §§ 63–80 GWB – appeals and judicial review;
• §§ 81 onwards GWB – administrative-fine proceedings.

The GWB expressly gives competition authorities broad investigative powers, permitting them to conduct investigations and obtain evidence necessary for performing their statutory functions.

B. German Administrative Procedure Law

The Verwaltungsverfahrensgesetz (VwVfG) supplies general administrative-law principles where the GWB does not provide a special rule.

Important principles include:

• legality;
• impartiality;
• investigation of relevant facts;
• right to be heard;
• proportionality;
• reasoning of administrative decisions;
• protection of legitimate interests;
• confidentiality.

C. Constitutional Law

Competition investigations may affect:

• Article 19(4) GG – effective judicial protection;
• Article 20(3) GG – rule of law;
• Article 103(1) GG – right to be heard;
• Article 10 GG – secrecy of communications;
• Article 13 GG – inviolability of the home;
• protection of property and professional freedom.

D. European Union Law

Where Articles 101 or 102 TFEU are involved, German competition authorities operate within the EU competition-law framework.

EU fundamental rights and the case law of the Court of Justice therefore influence German investigative procedure, especially concerning:

• inspections;
• evidence;
• proportionality;
• rights of defence;
• judicial review;
• protection of business premises.

3. Initiation of Competition Proceedings

Under § 54 GWB, the competition authority can commence proceedings:

• on its own initiative;
• following a complaint/application; or
• where another statutory mechanism triggers investigation.

The authority determines who is a formal participant in the proceedings.

This is important because procedural rights depend substantially upon Beteiligteneigenschaft, or status as a participant.

Participants can include:

• the undertaking against which proceedings are directed;
• applicants;
• undertakings whose interests are substantially affected;
• admitted third parties.

The administrative procedure consequently begins before any final infringement decision is made.

4. Principle of Official Investigation

German competition procedure follows the principle that the authority bears responsibility for establishing the relevant facts.

This means that the Bundeskartellamt is not merely an adjudicator of evidence supplied by private parties.

Under § 57 GWB, the competition authority may conduct investigations and obtain evidence required for its functions.

Investigative techniques can include:

• requests for information;
• documentary production;
• witness examinations;
• expert evidence;
• inspection of business records;
• searches;
• seizure;
• economic analysis;
• digital evidence collection.

The Bundeskartellamt itself describes cartel investigations as involving, among other things, searches, witness examinations and evaluation of seized evidence.

5. Right to Be Heard

The right to be heard is a fundamental component of German competition procedure.

Before adopting an adverse decision, the affected undertaking should ordinarily have an opportunity to respond to:

• the relevant facts;
• evidence;
• legal assessment;
• proposed enforcement action.

The purpose is not merely formal.

It serves two functions:

First — protection of the undertaking

The undertaking can:

• contest factual findings;
• explain commercial circumstances;
• identify errors;
• challenge economic assumptions;
• raise legal objections.

Second — better administrative decision-making

The hearing allows the authority to correct factual or analytical mistakes before issuing the final decision.

The Bundesgerichtshof has emphasized the importance of informing procedural participants about material facts and the preliminary economic and legal assessment relevant to the decision.

6. Access to the Administrative File

Akteneinsicht—access to the investigation file—is one of the most important procedural safeguards.

Under § 56 GWB, participants may obtain access to material in the competition authority's file insofar as knowledge of the material is necessary for asserting or defending their legal interests.

However, access is not unlimited.

Restrictions may be justified by:

• business secrets;
• trade secrets;
• confidentiality;
• protection of investigative functions;
• other legally protected interests.

The law therefore creates a balance between defence rights and confidentiality.

Importance

A competition decision may rely on:

• customer responses;
• competitor information;
• internal company documents;
• market surveys;
• economic data;
• third-party submissions.

The undertaking must have sufficient information to defend itself, but the authority may need to protect confidential information belonging to third parties.

7. Investigative Powers Under § 57 GWB

Section 57 is deliberately broad.

The authority may collect:

• documentary evidence;
• witness testimony;
• expert evidence;
• inspection evidence;
• other relevant evidence.

The provision also incorporates specified rules of the German Code of Civil Procedure concerning evidence.

This gives competition investigations a hybrid character:

administrative proceedings + specialized evidentiary mechanisms + judicial safeguards.

8. Requests for Information

Section 59 GWB provides extensive information-gathering powers.

The Bundeskartellamt may require undertakings to:

• provide information;
• produce documents;
• provide market studies;
• disclose relevant business information;
• respond to structured questionnaires;
• identify responsible representatives.

The demand must, however, be proportionate and specify its legal basis, subject matter and purpose.

This is particularly significant in modern investigations involving:

• algorithmic pricing;
• digital platforms;
• large datasets;
• communications records;
• internal databases;
• automated decision-making systems.

9. Privilege Against Self-Incrimination

A major procedural limitation is the protection against compelled self-incrimination.

Section 59 GWB provides that an information request cannot force the addressee to confess to:

• a criminal offence;
• an administrative offence;
• an infringement of the GWB;
• an infringement of Articles 101 or 102 TFEU. 

This creates an important distinction between:

compelled factual information
and
compelled admission of unlawful conduct.

The principle becomes especially important where administrative competition proceedings can lead to substantial fines.

10. Searches and Seizures

Searches are among the most intrusive investigative measures.

The GWB permits competition authorities to conduct searches in appropriate circumstances, particularly where evidence of cartel conduct may otherwise be concealed or destroyed.

The procedural safeguards reflect the constitutional protection of premises.

A search can potentially affect:

• corporate offices;
• employees' workspaces;
• electronic systems;
• physical records;
• private premises in appropriate circumstances.

Seizure is separately regulated under § 58 GWB. The provision provides judicial safeguards, including the possibility of seeking judicial review of a seizure.

11. Proportionality

The Verhältnismäßigkeitsprinzip is a central constraint on competition investigations.

An investigative measure should generally satisfy:

1. Legitimate objective

There must be a legitimate competition-law purpose.

2. Suitability

The measure must be capable of contributing to that purpose.

3. Necessity

A less intrusive measure should not achieve the same objective equally effectively.

4. Balancing

The interference with the undertaking's protected interests must be proportionate to the public interest in competition enforcement.

This principle is particularly significant for:

• searches;
• seizures;
• broad information requests;
• digital evidence;
• access to confidential material.

12. Duty to Give Reasons

Administrative decisions affecting undertakings must provide sufficient reasoning.

Reasoning performs several functions:

• demonstrates that the authority considered relevant facts;
• enables the undertaking to understand the decision;
• facilitates judicial review;
• prevents arbitrary decision-making.

For investigative decisions, the reasoning need not necessarily reveal every piece of evidence possessed by the authority, particularly at the beginning of an investigation. Nevertheless, the undertaking must be able to understand the subject matter and purpose of the investigation sufficiently to protect its rights.

13. Confidentiality and Business Secrets

Competition investigations frequently involve commercially sensitive information.

Examples include:

• prices;
• costs;
• customer lists;
• supply agreements;
• algorithms;
• business strategies;
• source code;
• market forecasts;
• internal correspondence.

German procedure therefore recognizes the importance of Betriebs- und Geschäftsgeheimnisse.

At the same time, confidentiality cannot be used so broadly that it eliminates effective defence rights.

The procedural challenge is therefore:

How much information must be disclosed to enable effective defence without unnecessarily exposing protected commercial information?

This issue has generated significant BGH jurisprudence.

14. Judicial Review

The Bundeskartellamt is an administrative authority, not a court.

Its decisions are therefore subject to judicial review.

The German system provides specialized competition-law review through the courts, including the Oberlandesgerichte and, on points of law in appropriate cases, the Bundesgerichtshof (BGH).

The BGH has a specialized Kartellsenat.

The GWB expressly provides for judicial review mechanisms, while the Federal Court of Justice has jurisdiction over specified competition appeals and administrative-fine matters.

This is an important manifestation of Article 19(4) GG, guaranteeing effective judicial protection against public-authority action.

15. Six Major Case Laws

Case 1 — BGH, 4 October 2007, KRB 59/07

Issue

Access to cartel-fine files containing information relating to other defendants.

Principle

The BGH considered whether the defence of one participant could obtain access to the files of other participants in the same overall cartel complex.

The Court held, in substance, that access could extend to the files of other affected parties where they concerned the same overall factual complex and were before the appellate court.

Importantly, the mere possibility that the documents contained business secrets of other participants did not automatically eliminate access.

Significance

The case demonstrates that:

confidentiality ≠ automatic denial of access.

The authority and courts must balance:

• defence rights;
• business secrecy;
• procedural fairness.

Case 2 — BGH, 2 February 2010, KVZ 16/09

Issue

Judicial review of refusal of access to competition-authority files.

Principle

The BGH held that where a competition authority refuses consent to access its administrative files in an appeal proceeding, the refusal is subject to the specialized procedural mechanism under the GWB.

The decision concerned the interaction between:

• file access;
• judicial review;
• Article 19(4) GG;
• Article 103(1) GG.

Significance

The case illustrates that procedural decisions concerning access to evidence are themselves subject to legal control.

Case 3 — BGH, 20 February 2024, KVB 69/23

Issue

Right of a participant in a competition proceeding to receive sufficient information about the authority's factual and legal assessment.

Principle

The BGH emphasized that parties admitted to proceedings must generally be informed about facts relevant to the decision and about the preliminary economic and legal assessment necessary to exercise their right to be heard.

The Court also recognized that the authority retains some discretion regarding the manner in which information is disclosed.

Significance

The decision is particularly important for modern competition investigations because authorities increasingly use:

• economic models;
• market surveys;
• large datasets;
• complex legal theories.

Procedural fairness requires meaningful opportunity to respond to the material reasoning underlying the proposed intervention.

Case 4 — BGH, 18 March 2025, KVB 61/23

Issue

Extent of access to raw data collected by the Bundeskartellamt.

Facts

In proceedings concerning a major digital undertaking, the Bundeskartellamt had obtained information from numerous:

• app publishers;
• hardware manufacturers;
• telecommunications companies.

The undertaking sought broader access to the underlying questionnaire responses, including anonymized material.

Principle

The BGH accepted restrictions on access where disclosure could threaten protected business secrets and other legitimate interests, particularly where the authority had supplied:

• questions;
• aggregated responses;
• evaluation material;
• explanations of the underlying methodology.

The later 26 May 2025 decision concerning the same litigation rejected an assertion that the restricted access had violated the right to be heard.

Significance

This is highly relevant to data-driven competition enforcement.

It establishes that the right of access does not necessarily mean an unconditional right to every item of raw data.

The crucial question is whether the information provided permits an effective defence while legitimate confidentiality interests remain protected.

Case 5 — ECJ, Roquette Frères, C-94/00, 22 October 2002

Issue

Judicial protection against coercive competition investigations.

Principle

The Court of Justice held that national courts authorizing coercive investigative measures must ensure that the measures are not arbitrary or disproportionate.

The national court must have sufficient information to perform that review.

Significance for Germany

Although the case arose from France, it establishes an EU-level procedural principle directly relevant whenever EU competition investigations involve national authorities:

intrusive investigative powers must remain subject to effective judicial protection and proportionality.

Case 6 — ECJ, Nexans v Commission, C-37/13 P, 25 June 2014

Issue

Reasoning and scope of a competition inspection.

Principle

The Court recognized that an inspection occurs at an early stage when the Commission may not yet possess complete information about the suspected infringement.

Consequently, the authority is not required to possess the same degree of certainty that would be necessary for a final infringement decision.

Nevertheless, the inspection decision must satisfy the applicable reasoning requirements and be based on sufficiently serious grounds.

Significance

The case demonstrates the difference between:

investigative suspicion
and
final proof of infringement.

This distinction is essential to understanding German cartel investigations.

Case 7 — ECJ, Deutsche Bahn AG v Commission, C-583/13 P, 18 June 2015

Issue

Inspection powers, judicial review and information discovered outside the scope of an inspection.

Principle

The Court held that the absence of prior judicial authorization does not automatically violate fundamental rights where effective judicial review of the inspection decision is available.

However, the Commission must respect the defined subject matter and purpose of the inspection. Information unrelated to the authorized investigation cannot simply be used as though it were within the original authorization.

The Court also emphasized the importance of adequate reasoning and rights of defence.

Significance

The case establishes an important principle:

Broad investigative powers do not amount to unlimited investigative powers.

16. Administrative Procedure in a Typical German Cartel Investigation

A simplified procedural sequence is:

Information / complaint / authority intelligence

↓

Initiation under § 54 GWB

↓

Identification of parties

↓

Preliminary investigation

↓

Information requests under § 59 GWB

↓

Documentary and economic evidence

↓

Possible search and seizure

↓

Witness / expert evidence

↓

Evaluation of evidence

↓

Access to relevant file material

↓

Hearing and opportunity to comment

↓

Preliminary legal and economic assessment

↓

Final administrative decision

↓

Possible administrative fine

↓

Judicial review

↓

Oberlandesgericht / Bundesgerichtshof where applicable

17. Relationship Between Administrative Proceedings and Fine Proceedings

An important distinction must be made between:

Administrative competition proceedings

These may establish:

• abuse of dominance;
• restrictive agreements;
• prohibited conduct;
• merger-control violations;
• obligations or remedies.

Administrative-fine proceedings

These concern punishment of competition-law offences and therefore involve stronger procedural safeguards.

The GWB separately regulates administrative-fine proceedings and provides specialized judicial review.

The distinction is important because the closer the proceeding comes to punitive enforcement, the greater the importance of:

• defence rights;
• privilege against self-incrimination;
• access to evidence;
• judicial review;
• reasoned decisions.

18. Confidentiality Versus Defence Rights

One of the central procedural tensions can be represented as follows:

German procedure does not resolve this conflict by automatically giving priority to one side.

Instead, it uses case-specific balancing mechanisms.

19. Digital Evidence and Modern Investigations

Administrative procedure law has become particularly important with the growth of digital competition.

Investigations may involve:

• emails;
• messaging applications;
• cloud records;
• algorithmic pricing data;
• platform logs;
• search-ranking information;
• consumer data;
• APIs;
• internal databases;
• machine-learning systems.

The traditional distinction between "document" and "data" has consequently become less significant.

The procedural questions remain substantially the same:

1. Was the information lawfully obtained?
2. Was the investigation sufficiently defined?
3. Was the request proportionate?
4. Was the evidence relevant?
5. Was confidential material protected?
6. Was the undertaking given sufficient information to respond?
7. Can the authority's use of the evidence be judicially reviewed?

20. Importance of the Principle of Proportionality

Proportionality functions as a general control mechanism across the investigation.

For example, a broad data request should be connected to:

• the subject matter of the investigation;
• a legitimate enforcement objective;
• evidence reasonably necessary for that objective.

Similarly, a search should not become an unrestricted investigation into unrelated conduct.

The reasoning in Roquette Frères, Nexans, and Deutsche Bahn illustrates the European dimension of these limits.

21. Importance of Reasoned Administrative Decisions

A reasoned competition decision is necessary because competition law frequently involves complex economic questions.

The authority may need to explain:

• relevant market;
• market power;
• competitive effects;
• evidence of coordination;
• theory of harm;
• economic methodology;
• causal relationship;
• proportionality of remedy.

A vague decision would impair both:

• the undertaking's ability to defend itself; and
• the court's ability to review the authority's action.

Thus, reason-giving is both a procedural guarantee and a prerequisite for effective judicial review.

22. Remedies for Procedural Violations

Procedural defects may potentially result in:

• annulment or modification of an administrative decision;
• exclusion or reduced evidentiary value of improperly obtained material;
• judicial orders concerning file access;
• correction of procedural deficiencies;
• reconsideration by the competition authority;
• reduction or reversal of fines where legally justified.

The precise consequence depends on:

• the nature of the procedural defect;
• its seriousness;
• whether it affected the defence;
• statutory provisions;
• the applicable judicial-review standard.

Not every procedural irregularity automatically invalidates the entire competition proceeding.

23. Key Legal Principles Emerging from the Case Law

The jurisprudence can be reduced to several principles.

1. Investigative powers are broad but not unlimited

The Bundeskartellamt possesses extensive investigative powers, but they remain legally bounded.

2. Effective defence is fundamental

The undertaking must receive sufficient information to understand and challenge the authority's case.

3. Confidentiality is legitimate but qualified

Business secrets can justify restrictions, but confidentiality cannot automatically extinguish defence rights.

4. Proportionality controls coercive measures

Searches, seizures and information demands must remain connected to legitimate investigative objectives.

5. Investigation is different from final adjudication

An authority may investigate on the basis of reasonable grounds without already possessing conclusive proof.

6. Judicial review is essential

Administrative competition enforcement remains subject to specialized judicial scrutiny.

7. Digital investigations require the same procedural principles

The technological sophistication of the evidence does not eliminate legality, proportionality, hearing or defence requirements.

24. Conclusion

Administrative procedure law in German competition investigations creates a structured balance between effective antitrust enforcement and protection of procedural rights.

The GWB gives the Bundeskartellamt substantial powers to investigate, obtain information, inspect documents, conduct searches and impose enforcement measures. Sections 54–61 GWB form the core administrative-investigation framework.

At the same time, those powers are constrained by:

• the right to be heard;
• access to relevant evidence;
• confidentiality protections;
• proportionality;
• privilege against self-incrimination;
• reasoned decisions;
• constitutional rights;
• EU fundamental rights;
• judicial review.

The German case law, particularly BGH KRB 59/07, BGH KVZ 16/09, BGH KVB 69/23, BGH KVB 61/23, Roquette Frères, Nexans and Deutsche Bahn, demonstrates that competition administration is not simply an exercise of regulatory power. It is a legally structured administrative process in which investigative effectiveness must coexist with procedural fairness and judicial accountability.