TransMedics Group, Inc. ( TMDX ) is one of the companies in my portfolio that I believe has enormous upside potential. TransMedics' technology has the potential to transform transplant procedures in the long term and save lives. However, I alsoMy primary area of concentration will be on identifying companies of exceptional caliber, with a proven ability to reinvest capital for impressive returns. The ideal scenario is for these companies to demonstrate a long-term capability of capital compounding, with a h ...