Background: Company director networks have been studied for many countries, including South Africa, from the perspective of network theory. However, most studies of company director networks focus on the overall structure of the network, that is, by conducting a macro-level analysis. Aim: In this study, we conducted a node-level analysis to investigate whether the four major South African banks, namely, Barclays Africa Group Ltd (now ABSA Group Limited), Nedbank Group Ltd, Standard Bank Group Ltd and FirstRand Ltd, occupy central roles in the company director network on the Johannesburg Stock Exchange (JSE). Setting: Social networks provide a vital source of information and are therefore an important field of study in business. Methods: We use degree-, betweenness- and closeness centrality, as well as strength, and a force-directed layout to investigate whether these four banks occupy key positions in the company director network on the JSE. Results: We show that these four banks occupy central roles on the JSE. The direct connections of these companies are also identified, and findings are compared to some overseas studies. Conclusion: This study concludes that the said four major banks occupy key positions on the JSE.

中文翻译：

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约翰内斯堡证券交易所四大银行的加权董事网络分析

背景：已经从网络理论的角度研究了包括南非在内的许多国家的公司董事网络。但是，对公司董事网络的大多数研究都集中在网络的总体结构上，即通过进行宏观层次的分析。目的：在这项研究中，我们进行了节点级分析，以调查南非的四大主要银行，即巴克莱非洲集团有限公司（现为ABSA集团有限公司），内德班克集团有限公司，标准银行集团有限公司和FirstRand有限公司是否占据了中央银行在约翰内斯堡证券交易所（JSE）的公司董事网络中担任职务。设置：社交网络提供重要的信息资源，因此是商业研究的重要领域。方法：我们使用度，中间度和紧密度中心度以及强度，以及一个以力为导向的布局，以调查这四家银行是否在JSE的公司董事网络中占据关键位置。结果：我们显示这四家银行在JSE中扮演着核心角色。还确定了这些公司的直接联系，并将调查结果与一些海外研究进行了比较。结论：该研究得出的结论是，上述四家主要银行在JSE中占据关键位置。