Janus Henderson Group plc ( NYSE:JHG ) stock is about to trade ex-dividend in four days. The ex-dividend date is one business day before a company's record date, which is the date on which the company determines which shareholders are entitled to receive a dividend. The ex-dividend date is an important date to be aware of as any purchase of the stock made on or after this date might mean a late settlement that doesn't show on the record date. Therefore, if you purchase Janus Henderson Group's shares on or after the 10th of November, you won't be eligible to receive the dividend, when it is paid on the 30th of November.