Based on the current market and the values imposed by consumers, you can no longer do business thinking only about financial gain through product sales. The old method worked for many years, but now it is being replaced by another way of doing business. The novelty is the personalisation of the relationship with customers, called "one to one" marketing. This study was developed by the descriptive methodology through the case study, seeking to investigate whether the so-called "one to one" marketing can provide relevant support to the entrepreneur to obtain revenues and longevity in business, this, through the formation of a customer portfolio that guarantees the enterprise.