Interlocking Directorates in Digital Conglomerates

1. Introduction

Interlocking directorates arise when the same individual serves simultaneously on the boards of two or more companies that are actual or potential competitors, suppliers, customers, infrastructure providers, or otherwise economically connected. In traditional industries, interlocking directorates have long been treated as a possible mechanism for facilitating coordination, reducing independent decision-making, and softening competition.

In digital conglomerates, the problem is more complex. A single corporate group may operate across search, advertising, cloud computing, app stores, operating systems, payments, social media, artificial intelligence, hardware, digital identity, data analytics, and content. Directors may therefore occupy positions across businesses that are formally separate but economically interconnected.

The competition-law concern is not simply that a person holds two directorships. The crucial question is whether the governance relationship reduces competitive independence, facilitates exchange of competitively sensitive information, reinforces ecosystem control, or contributes to coordinated conduct or exclusionary strategies.

2. Meaning of Interlocking Directorates

An interlocking directorate exists where:

one individual sits on the boards of two competing undertakings;

directors or senior officers of competing undertakings overlap;

a parent company appoints common directors to subsidiaries that compete with one another;

common investors influence board composition across competing digital firms; or

a director participates in governance of businesses operating at different levels of a digital ecosystem.

The relationship may be:

Horizontal

The two companies compete in the same market.

Example:

A director simultaneously sits on the boards of two competing AI-model providers.

This is the most obvious competition concern.

Vertical

The companies operate at different levels of the supply chain.

Example:

A director sits on the board of a cloud infrastructure provider and an AI application platform dependent upon that cloud infrastructure.

The concern is potential access to commercially sensitive information and discriminatory treatment.

Conglomerate

The companies operate in complementary or adjacent digital markets.

Example:

A director participates in governance of a dominant mobile operating system, an app store, an advertising platform, and a payments business.

The competition concern arises because governance overlap can reinforce ecosystem leverage.

3. Why Digital Conglomerates Make Interlocking Directorates More Significant

Digital markets create several characteristics that amplify the risks associated with board overlap.

A. Multi-market operation

A digital conglomerate may simultaneously participate in numerous markets.

The same boardroom can therefore encompass information concerning:

prices;

algorithms;

advertising strategies;

cloud capacity;

AI investment;

platform access;

data acquisition;

acquisitions;

product launches;

interoperability;

API policies;

app-store commissions; and

strategic partnerships.

Consequently, information that appears unrelated to one market can have competitive significance elsewhere.

B. Ecosystem competition

Competition increasingly occurs between ecosystems rather than isolated products.

A conglomerate controlling several complementary services can use governance structures to coordinate:

operating system → app store → advertising → payments → cloud → AI → data.

Interlocking directors may therefore strengthen an ecosystem's ability to coordinate commercial policy.

C. Data concentration

Digital businesses possess enormous quantities of commercially valuable data.

Board-level access to information concerning:

customer behaviour;

search queries;

advertising performance;

transaction data;

developer activity;

AI training data; and

switching behaviour

can potentially create competitive advantages beyond the conventional information exchanges associated with traditional industries.

D. Rapid innovation cycles

Digital markets frequently involve rapidly changing technologies.

A director who participates in several technology companies may obtain early knowledge about:

emerging AI capabilities;

product roadmaps;

technological standards;

acquisitions;

patent strategies;

security vulnerabilities; and

planned market entry.

This makes informational leakage potentially more consequential than in slower-moving markets.

4. Competition-Law Theory

Interlocking directorates can affect competition through several mechanisms.

A. Facilitation of collusion

A shared director can become a channel through which competitors obtain:

future pricing information;

strategic plans;

production forecasts;

investment plans;

customer information;

market-entry strategies.

The boardroom can therefore become an indirect mechanism for coordination.

Importantly, competition law generally does not require a written agreement labelled "cartel." Coordination may be inferred from conduct and surrounding circumstances.

B. Reduction of strategic uncertainty

Competition works partly because businesses do not know precisely what their rivals will do.

Interlocking directorates can reduce this uncertainty.

Suppose competing AI companies independently determine:

model prices;

API charges;

computing capacity;

licensing conditions.

If their boards share directors, commercially sensitive information may circulate through governance structures.

The result may be reduced strategic uncertainty, making coordination easier.

C. Common ownership and board interlocks

Digital conglomerates can also be connected through institutional investors.

Where investors have significant influence over several competing digital companies and participate in governance, the competition concern may resemble the traditional common-ownership problem.

The theory is:

common ownership → governance influence → weaker competitive incentives → potentially softer competition.

This does not mean that every common investor or director creates an infringement. The competitive effects depend upon the degree of influence, market structure, information access, and actual conduct.

5. U.S. Antitrust Law and Section 8 of the Clayton Act

The clearest statutory treatment of interlocking directorates exists in the United States.

Section 8 of the Clayton Act addresses interlocking directorates between competing corporations, subject to statutory thresholds and exceptions.

Its fundamental objective is preventive.

The law attempts to stop potentially anticompetitive relationships before they facilitate an actual cartel.

This is particularly relevant to digital markets because a board interlock can exist before any observable coordination appears in prices.

The important distinction is:

Section 8 concerns the structural relationship itself, whereas Sections 1 and 2 of the Sherman Act can address the resulting anticompetitive conduct.

Thus, a digital conglomerate may face two separate questions:

Is the board relationship legally permissible?

Has the relationship contributed to an agreement or monopolization strategy?

6. EU Competition Law

EU competition law does not contain an exact equivalent of Section 8 covering all interlocking directorates.

Nevertheless, interlocking governance can become relevant under:

Article 101 TFEU;

Article 102 TFEU;

merger-control principles;

information-exchange doctrine;

joint-venture analysis; and

national competition laws.

The central issue under Article 101 is whether the governance relationship contributes to an agreement or concerted practice that restricts competition.

The important concept is exchange of competitively sensitive information.

Information exchanged through directors can concern:

prices;

costs;

output;

customers;

future commercial strategies;

investments;

technological development.

Where such information exchange facilitates coordination between competitors, Article 101 concerns can arise.

7. German Competition Law

Germany provides an especially important framework for analysing interlocking directorates in digital conglomerates.

The GWB addresses competition restrictions arising from agreements, coordinated conduct, dominance, and combinations of enterprises.

Section 1 GWB can become relevant where board relationships facilitate coordinated conduct.

Section 19 GWB becomes relevant where a dominant undertaking uses its position to engage in exclusionary or exploitative conduct.

The German framework is particularly significant for digital conglomerates because the modern GWB contains specific provisions addressing undertakings of paramount significance across markets.

This permits competition authorities to examine ecosystem power that extends beyond a single conventional relevant market.

Accordingly, an interlocking directorate could become relevant where governance overlap strengthens the ability of a major digital undertaking to:

leverage power across markets;

discriminate against rivals;

control access to infrastructure;

obtain competitively significant information; or

coordinate behaviour across interconnected markets.

8. Six Important Case Laws

1. United States v. Sears, Roebuck & Co. — Interlocking Directorate Principle

The historical American jurisprudence concerning interlocking directorates demonstrates the preventive rationale underlying Section 8.

The essential competition-law principle is that structural relationships between competing corporations may create risks even before a traditional cartel is proven.

Relevance to digital conglomerates

The principle can be adapted to circumstances where directors participate in governance of competing digital platforms.

For example:

competing online marketplaces + common board member + access to pricing strategy

may present a substantially greater competitive concern than an ordinary independent investment.

2. United States v. Philadelphia National Bank, 374 U.S. 321 (1963)

This case concerned concentration in banking and remains important for understanding structural competition analysis.

The Supreme Court treated concentration and competitive structure as important elements of antitrust assessment.

Relevance

Digital conglomerates increasingly combine:

payment systems;

financial platforms;

advertising;

cloud services;

consumer data;

identity systems.

Board overlaps can therefore contribute to concerns about structural concentration and reduced competitive independence.

3. FTC v. Cement Institute, 333 U.S. 683 (1948)

The Supreme Court considered coordinated conduct and information exchange in the cement industry.

The case is important because it demonstrates that systematic sharing of competitively significant information can contribute to unlawful coordination.

Digital relevance

Digital markets make information exchange substantially easier.

A common director may potentially transmit information regarding:

algorithmic pricing;

advertising rates;

AI API prices;

cloud costs;

capacity;

product launches.

Thus, boardroom information exchange can become an important evidentiary fact in a broader Article 101 or Sherman Act analysis.

4. United States v. Container Corporation of America, 393 U.S. 333 (1969)

This is one of the leading U.S. authorities on information exchange.

The Court found that exchanges of price information among competitors could facilitate anticompetitive coordination.

Importance for interlocking directorates

A director sitting on the boards of competing companies can potentially have access to exactly the kind of strategic information that competition law seeks to prevent competitors from exchanging.

Therefore:

common director → information access → reduced uncertainty → coordination risk

is a significant analytical chain.

5. T-Mobile Netherlands BV v. Raad van bestuur van de Nederlandse Mededingingsautoriteit, Case C-8/08

The Court of Justice of the European Union examined information exchange and concerted practices.

The case is particularly important for the proposition that the exchange of competitively sensitive information can reduce strategic uncertainty and therefore constitute a restriction of competition.

Relevance to digital conglomerates

An interlocking director does not need to communicate a formal instruction such as:

"Raise your price."

The mere circulation of strategic information can alter competitors' expectations.

In digital markets this could concern:

API pricing;

cloud charges;

advertising prices;

commission rates;

AI licensing;

investment plans.

6. Eturas UAB v Lietuvos Respublikos konkurencijos taryba, Case C-74/14

This case concerned an electronic platform and coordination through a digital system.

It is highly relevant to modern digital competition analysis because it demonstrates how technology can function as a mechanism for facilitating coordinated behaviour.

Relevance to interlocking directorates

The modern equivalent of a traditional boardroom exchange may involve:

platform dashboards;

automated communications;

shared management systems;

common technology providers;

algorithmic interfaces.

An interlocking directorate can therefore operate as one element within a wider digital coordination architecture.

7. AC-Treuhand AG v European Commission, Case C-194/14 P

The Court of Justice confirmed that an undertaking can incur Article 101 responsibility even where it is not itself operating at the same level of the market as the cartel participants, if it intentionally facilitates the anticompetitive arrangement.

Importance

This expands the analytical focus beyond the question:

"Who actually sold the product?"

Competition law can examine:

"Who facilitated the coordination?"

For digital conglomerates, a common director or governance structure may therefore become relevant where it contributes to coordination between otherwise separate businesses.

8. Airtours plc v Commission, Case T-342/99

Airtours is one of the foundational EU authorities concerning coordinated effects and collective dominance.

The General Court examined whether market characteristics could permit firms to coordinate without an express agreement.

Relevance

Digital ecosystems can possess characteristics conducive to coordination:

high transparency;

algorithmic monitoring;

repeated interaction;

network effects;

high barriers to entry;

concentrated market structure.

An interlocking directorate can reinforce these conditions by providing an additional channel for information and strategic alignment.

9. Interlocking Directorates and Article 101 TFEU

The strongest EU theory arises where the interlock facilitates an agreement or concerted practice.

Three elements become particularly important.

First: competitor relationship

Are the companies actual or potential competitors?

Second: competitively sensitive information

Does the director have access to information concerning:

prices;

customers;

costs;

capacity;

future products;

strategic investments?

Third: competitive effect

Does the relationship reduce strategic uncertainty or facilitate coordinated behaviour?

The existence of a director overlap alone should not automatically establish an Article 101 infringement.

The competition authority must establish the necessary legal connection between the governance structure and anticompetitive conduct.

10. Interlocking Directorates and Article 102 TFEU

The problem becomes different where one company is dominant.

Consider a hypothetical digital conglomerate controlling:

a dominant mobile operating system;

an app store;

digital advertising;

payments; and

cloud services.

Suppose several affiliated or strategically connected companies share directors.

The relevant concern may be whether the governance structure helps the dominant undertaking:

foreclose rivals;

discriminate between competing services;

transfer strategic information;

impose tying arrangements;

favour affiliated businesses;

restrict interoperability.

The board interlock would therefore be evidence within a broader abuse-of-dominance theory, rather than necessarily constituting abuse by itself.

11. Digital Conglomerates and Information Firewalls

One important remedy is the creation of information firewalls.

A company may restrict directors and executives from receiving competitively sensitive information relating to another business.

Possible safeguards include:

separate board committees;

confidentiality protocols;

restricted board materials;

conflict registers;

independent directors;

recusal procedures;

separate strategic teams;

information-access controls;

compliance audits.

For AI companies, additional measures could include:

restricting access to model-development roadmaps;

segregating training-data strategies;

limiting access to compute procurement information;

separating customer-level data;

preventing disclosure of algorithmic pricing strategies.

12. The Special Problem of AI Conglomerates

Interlocking directorates become especially sensitive where companies operate AI infrastructure.

Imagine a conglomerate with businesses covering:

chips → cloud → foundation models → AI agents → enterprise software → advertising.

A common director could potentially observe the entire technological pipeline.

This creates an unusual competitive-information advantage.

For example, information about an AI firm's anticipated computing requirements could reveal:

expected model launches;

anticipated demand;

pricing strategy;

customer expansion;

technological capability.

Thus, governance overlap can potentially become a mechanism for vertical and horizontal intelligence aggregation.

13. Board Interlocks and Ecosystem Foreclosure

Interlocking directorates can also reinforce ecosystem foreclosure.

Consider:

dominant OS → app store → payment system → advertising network → cloud platform.

A common director can theoretically contribute to strategic coordination across these layers.

The concern is not necessarily that the companies explicitly agree to exclude a rival.

Instead, governance integration may make it easier to pursue a unified strategy:

identify a potential rival;

restrict its platform access;

impose discriminatory technical requirements;

redirect users toward affiliated services;

use advertising or data advantages to weaken the rival.

This creates an important competition-law concept:

Governance-enabled ecosystem foreclosure.

14. Interlocking Directorates and Merger Control

Board overlap can also matter during merger investigations.

Competition authorities may ask:

Does the transaction create common control?

Will directors obtain access to competitors' strategic information?

Does the transaction create a structural link between competitors?

Does it facilitate coordination?

Does it increase the conglomerate's ability to leverage market power?

This is particularly important in digital markets because a relatively small acquisition may create a significant ecosystem connection.

15. Potential Defences

Not every interlocking directorate is anticompetitive.

Possible legitimate explanations include:

A. Corporate restructuring

Common directors may simply reflect a corporate group's internal organisation.

B. Minority investments

A minority investment may not create sufficient influence to affect competitive behaviour.

C. Independent directorship

A director may have no operational role and may be subject to strict confidentiality safeguards.

D. Different markets

Companies may operate in unrelated markets with little realistic competitive overlap.

E. Compliance mechanisms

Effective information barriers may substantially reduce the risk of competitive information exchange.

The legal assessment must therefore distinguish between formal board overlap and economically meaningful competitive influence.

16. Competition Risks in Digital Conglomerates

17. Regulatory Approach

A sensible competition-law approach should avoid treating every board overlap as unlawful.

Instead, authorities should adopt a risk-based framework.

Stage 1 — Identify the relationship

Determine whether the companies are:

competitors;

potential competitors;

vertically connected;

complementary businesses; or

members of the same corporate ecosystem.

Stage 2 — Examine influence

Determine the director's actual authority.

Stage 3 — Identify information access

Examine whether the director receives competitively sensitive information.

Stage 4 — Analyse market structure

Consider:

concentration;

entry barriers;

network effects;

switching costs;

data advantages;

ecosystem dependency.

Stage 5 — Examine conduct

Look for:

parallel pricing;

coordinated investment;

discriminatory access;

common product strategies;

exclusionary conduct.

Stage 6 — Consider safeguards

Assess:

recusal;

information firewalls;

independent governance;

confidentiality mechanisms.

18. Core Legal Principle

The central principle can be stated as follows:

An interlocking directorate is not inherently anticompetitive merely because two companies share a director; its competition significance increases where the relationship connects competing undertakings, provides access to competitively sensitive information, reduces strategic uncertainty, facilitates coordination, or strengthens the exercise of ecosystem market power.

This principle is particularly important for digital conglomerates because their markets are characterised by multi-sided platforms, network effects, data accumulation, algorithmic decision-making and cross-market leverage.

19. Conclusion

Interlocking directorates in digital conglomerates represent a modern form of structural competition risk.

Traditional antitrust law focused primarily on whether competing corporations had entered into an agreement. Digital competition requires regulators to examine the governance architecture through which information, incentives and strategic decisions move across an ecosystem.

The most important risks are:

exchange of competitively sensitive information;

facilitation of tacit or explicit coordination;

weakening of independent competitive decision-making;

reinforcement of conglomerate market power;

cross-market leveraging;

ecosystem foreclosure;

coordination of AI and algorithmic strategies; and

concentration of strategic information.

The cases such as Philadelphia National Bank, Cement Institute, Container Corporation, T-Mobile Netherlands, Eturas, AC-Treuhand and Airtours demonstrate that competition law can examine not merely formal agreements but also information flows, structural relationships, facilitation mechanisms and conditions conducive to coordinated conduct.

For digital conglomerates, therefore, the critical regulatory question is not simply:

"Who sits on whose board?"

It is:

"Does the governance structure compromise independent competitive decision-making or give one economic network the ability to coordinate, monitor, or leverage competition across multiple digital markets?"

That is the central competition-law significance of interlocking directorates in the digital economy.