For some individuals, trading can become a problematic activity and be considered a gambling disorder due to its adverse consequences. Because few studies have been conducted to date investigating this issue, the aim of this study is to improve knowledge on this topic by presenting a case study of a participant playing the stock market. A research interview was conducted, transcribed, and analyzed using Alceste®. This case study revealed three classes of meaning: the role of family in trading behavior; trading history, motives, and beliefs; and the tilt. Results shed light on the link between gambling and trading activities, and tend to support the existence of a trading behavior resembling addiction, which may be more significant when trading with high-risk derivative products due to their unique characteristics.