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Employee performance is influenced by several factors, one of them is internal communication. The phenomenon occurring in this digital era is that corporate internal communications have developed significantly, one of them is through the use of instant messaging applications. This research was conducted to discover the influence of corporate internal communication which consists of vertical communication, horizontal communication, and diagonal communication using WhatsApp instant messaging application toward employee performance in one of IT companies in Indonesia. The sample of this research is 150 employees from the total population of 227 employees. Data were extracted through questionnaires containing 42 statements then processed using IBM SPSS v.22 for Windows and Microsoft Office Excel 2013. Data were analyzed using path analysis method. The result of the analysis is the influence value of independent variables of corporate internal communication using WhatsApp application either done vertically, horizontally, or diagonally on the dependent variable of employee performance is 35.3%. It shows that corporate internal communication done vertically, horizontally, and diagonally using WhatsApp instant messaging application as the media has simultaneously and partially significant effect on employee performance. In accordance with the research result, it is suggested that employees need to be more active to communicate the problems faced in the work clearly so knowledge sharing can occur to solve the problem and good cooperation can be improved to achieve corporate’s goals. And for further research, it is recommended to explore other variables uncovered yet in this research, such as organizational culture, work environment, etc. Research on corporate internal communication toward employee performance can also be done in companies of other fields, for example in banking, mining industry, and so forth. Keywords—corporate internal communication; instant messaging application; employee performance

Corporate Internal Communication through the Use of WhatsApp Messaging Application and the Employee Performance of an IT Company in Indonesia