The economic cost of a fat finger mistake: a comparative case study from Samsung Securities’s ghost stock blunder

Yongkil Ahn

Journal of Operational Risk

Abstract: This paper quantifies the economic cost of Samsung Securities’s ghost stock blunder using the synthetic control method. As the financial world becomes more computer based, sudden price fluctuations caused by unintended human input errors appear to be happening more frequently. Samsung Securities, the Samsung conglomerate’s stock trading arm, mistakenly distributed shares worth over US$100 billion to its employees on April 6, 2018, due to a keyboard input error. The difficult process of finding a proper control group plagues comparative case studies. This study overcomes that hurdle by constructing a synthetic version of the event firm. It turns out that the company lost 12.17% (US$428 million) of its pre-event market capitalization, 3000 times the direct loss incurred, due to a fat finger mistake. The results highlight the importance of surveillance in curtailing unintended human errors such as incorrect keyboard inputs or mouse misclicks. Regulatory bodies should monitor financial institutions for their unintended errors and internal control systems.

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