RE:RE:RE:RE:RE:RE:BTE & SU the most undervalued oil stocks Market cap is good to use when a company wants to acquire or merge with another company or if a new investor wants to invest in a company, but from an existing shareholder perspective this means nothing because market cap can be increased by issuing new shares or acquiring another company through share deals and diluting at the expensive of the existing shareholders. For a shareholder the most important is the return of $ invested over a period of time.