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Extending the proposition that boards of directors influence firms’ mergers and acquisitions (M&As), studies have investigated how board interlocks – network ties formed by directors — may shape M&A processes and outcomes. While board interlocks and M&As are two streams of research, each underpinned by voluminous studies, their cross-fertilization has been relatively limited. In this chapter, the authors take stock of prior research investigating the relationship between board interlocks and M&As. Specifically, emphasizing the network features of board interlocks, the authors highlight a connection aspect and a structure aspect of board interlocks in appreciating their effects during pre-acquisition and post-acquisition phases. Based on this framework, the authors then lay out a research agenda that can further bridge board interlocks with M&As. Overall, this chapter endeavors to integrate and expand our knowledge on the acquisition implications of board interlocks.

This paper explores the relationship between board interlocks and firm outcomes by reviewing the most recent peer-reviewed articles examining this research theme.

A systematic and bibliometric methodology of assessing 369 peer-reviewed articles from the Web of Science (WoS) database was applied. The study also leverages key R-packages litsearchr and Bibliometrix software to enhance the descriptive and thematic literature analysis to identify gaps and opportunities for new research.

This study confirms a rapid increase in articles on this thematic area, over the last decade, with increasing collaboration occurring among researchers in the United States, Europe, China, South Korea and India. Four core research clusters are identified. The first and largest cluster links interlocked directors to issues related to corporate governance and firm outcomes. The second cluster links social network theory, interlocking directorates and firm outcomes. Smaller emerging research clusters include topics related to ownership structure, board size, political connectedness and impacts on firm outcomes. The final cluster examines the influence of board interlocks on market value and firm innovation.

Interlocked directors can have both positive and negative impacts on a wide variety of firm outcomes. This study places great interest in the selection of new directors, ensuring that the selection has aligned with the needs and interests of the company and disclosures of potential competing interests are declared and considered. Equally important are the governance practices used to monitor directors' behavior and to protect the interest of shareholders and the firm. This is particularly relevant in the internal appointment of interlocked directors to critical positions, such as audit committees or instances where interlocked directors may simultaneously hold CEO or executive leadership positions in other companies.

This paper examines the board interlocks literature related to firm outcomes. Additionally, this review identifies several topics and disciplines which, if pursued, could enrich the literature and promise new avenues for future research.

The purpose of this paper is to explore how networks of boards of directors affect relative performance evaluation (RPE) in chief executive officer (CEO) compensation.

In this study, the authors propose that an interlocking network is an important inter-corporate setting, which has a bearing on whether boards decide to use RPE in CEO compensation. They adopt four typical graph measures to depict the centrality/position of each board in the interlock network: degree, betweenness, eigenvector and closeness, and study their impacts on RPE use.

The authors find that firms that have more connected board members and whose board members are connected to better connected firms are more likely to reward their CEOs contingent on their peers’ performance, indicating that information transmission along the board interlock network facilitates the adoption of RPE. This result is robust to alternative measures for board interlock networks and various types of CEO compensation. It highlights the role of interlocking directorates in disseminating information and practice of RPE use along board network.

The authors use social network analysis to measure the relationships and flows between the connected nodes and study the impact on executive compensation design.

While previous studies have focused on the role of directors in the formation of transnational interlocks, this paper argues that firm strategy can also influence the development of these relationships. The purpose of this paper is to shed light on the practice of transnational interlocks by extending board interlocks theory from the national to the transnational context, and exploring aspects that are unique to the transnational level.

Based on the experiences of four British firms, this paper develops a conceptual framework that integrates under-examined dimensions of this networking practice at the organizational level of analysis, specifically degree of internationalization (DOI) and psychic distance (PD).

The paper argues that firms will increasingly engage in transnational interlocks as internationalization intensifies, and that expansion into psychically distant countries may result in further engagement in these connections. Further, firms will tend to form transnational received interlocks at their early stages of internationalization, and transnational sent and neutral interlocks at later stages of this process. It identifies four categories of firms: locals, extenders, explorers and cosmopolitans.

Directors can contribute to their firms’ success by interlocking with firms located in key foreign markets. Firms should also welcome directors with transnational board appointments to secure knowledge and resources overseas.

The manuscript contributes to our understanding of transnational interlocks by examining the independent and joint influence of the firm’s DOI and PD on the formation of such relationships.

This paper aims to explore the effect of interlocking directorates on agency conflicts and corporate performance in the shipping industry.

The authors use social network analysis to discover central nodes in the network of personal and corporate connections in an international sample of 110 listed shipping companies.

Assessing network structure, the authors find that the network of corporate leaders is denser than the network of shipping companies. The network of shipping companies is populated with many isolated nodes; the network of shipping executives and directors is populated with many cohesive groups in which the longest distance between two corporate leaders is two companies. The authors find that interlocking corporate leadership can help resolve agency conflicts in the shipping industry, bearing a negative effect on the magnitude of agency costs. The extent of leadership overlaps is associated with board size, financial leverage and profitability. The relationship between profits and interlocks is bidirectional, implying that interlocking directorates bear a positive effect on asset returns.

The authors map the relational structures in the social networks of companies and company leaders in the shipping industry and discover the cross-sectional determinants of interlocks in the shipping industry. The finding about the effect of interlocks on profitability and agency costs bears policy implications for the design of corporate governance in the shipping industry.

This study explores the influence of partner innovation in board interlock networks on a firm's innovation tendency.

This study collects a sample of publicly listed Chinese firms from 2008 to 2017 and uses fixed-effects ordinary least squares regressions to analyze the data.

This study shows that interlocking partners with different innovation levels than that of the focal firm affect its innovation tendency in distinct ways. For more innovative partners, the innovation level has a U-shaped effect on the focal firm's innovation tendency. In the case of less innovative partners, the innovation level facilitates the focal firm's innovation tendency.

Going beyond previous research that emphasized the role of interorganizational networks in facilitating firm innovation through a unitary learning effect, this study differentiates network partners into two categories based on their relative level of innovation compared with the focal firm and takes the hitchhiking effect into account to highlight potential obstacles in the learning process depending on the innovation conditions of partners. The study advances the literature on organizational learning, social networks and innovation.

This paper aims to explore the interlock-performance relationship among mainland Chinese firms listed in Hong Kong by taking advantage of a relationship-intensive context whereby such a link is likely to be especially important. Although strategic networks such as interlocking directorates have been found to affect a number of strategic behaviors, the link connecting board interlocks and corporate performance has remained ambiguous. Considerable light has been shed on the strategic networks of firms whose shares are listed abroad, which have been under-studied despite their rising importance in the global economy.

Data come from a particularly interesting historical period – the early 1990s prior to Hong Kong’s 1997 handover to China. Both quantitative and qualitative research have been used.

Empirically, it was found that good performance in an earlier period helps draw outside directors in a later period, and that network centrality and certain types of interlocks help improve performance, albeit with varying degrees. Overall, our results answer the question whether strategic networks such as interlocks matter for corporate performance with a qualified “yes”.

Taking advantage of a relationship-intensive context, this article explores the interlock-performance relationship among mainland Chinese firms listed in Hong Kong. Focus is specifically on the two years, 1993 and 1995, due to their specific historical importance because these two years represent the beginning of Chinese firms’ listing in Hong Kong.

Board interlocks are a phenomenon of widespread prevalence and one of the most vibrant topics in corporate governance research. However, despite sustained academic interest in interlocks, there has not been a comprehensive review of the literature in nearly two decades. To address this need for an up-to-date review, this paper aims to conduct an assessment and integration of the empirical research on board interlocks.

In reviewing the board interlocks literature, the “systematic review” approach, which emphasizes methodological rigor and transparency, has been used. Using this method, 81 empirical papers that became the focus of this analysis have been identified.

This review reveals that board interlocks research can be categorized based on the theoretical lens used, its focus on antecedents or outcomes of interlock activities and the perspective of the study (i.e. firm- or director-level). Moreover, a number of commonly examined themes have been identified. Several unexpected omissions in the literature have also been uncovered. For instance, it was found that scholars have neither examined the implications of engaging in interlocks in a global context nor have they explored the phenomenon of international interlocks (i.e. interlocks between firms located in different countries).

In developing a deeper understanding of the board interlocks literature, this review identifies several topics and disciplines that, if pursued, could enrich the literature and open promising avenues for future research.

We study the spatial diffusion of stock backdating, an instance of corporate misconduct about which public information was virtually absent until 2005. Contrary to the findings of Bizjack, Lemmon, and Whitby (2009), our results reveal that this “invisible” practice did not diffuse through board interlocks. Rather, stock backdating spread through geographic proximity: firms were more likely to backdate stock options to the extent that other firms located geographically close to them had done so. Lending support to the importance of localized interactions among members of the local business elite, the effect of geographical proximity was conditional on high levels of local board interlocks. Our findings regarding the differential impact of geographic proximity and board interlocks on the diffusion of this invisible practice are analogous to the diffusion pattern of controversial practices proposed by Davis and Greve (1997).

Gender diversity is extensively debated and researched in relation to corporate boards. The focus on the gender composition on single boards neglects an important issue: that of how the power of board members is impacted by their representation on other boards. Board interlocks refer to how a board member is also represented on other companies’ boards, and such representation expectedly makes the individual board member more influential in the boardroom than non-connected board members. The purpose of this paper is to investigate whether and how female board interlocks are considered in previous research on gender diversity on boards.

A systematic literature review was conducted. It comprised 71 highly cited articles. The articles were analyzed to grasp their content, and specifically, female influence in the boardroom related to power.

The literature review reveals that the interlock perspective is rare in studies on women’s board representation. This is so, even while evidence is provided that females often need companions to get their meanings across on the boards, despite how interlocks would create one link of such power, and although the literature points to how female board representation plays a part to explain performance, social responsibilities and overall strategic directions of firms.

Contributions are made to previous research by indicating the potential of further research in a largely neglected area of research while also summarizing the previous reporting on women on boards.