Due Diligence Checklist Stock Purchase is an extensive list of investigative processes that need to be reviewed before making an investment in a company’s stock. These processes include financial statements, legal filings, industry reports, and other pertinent information about the company’s past performance, current trends, and future prospects. This checklist helps ensure that investors have complete and accurate knowledge of the company before making any decisions to purchase its stock. The comprehensive level of due diligence required during a stock purchase process also creates an ethical and legal obligation for investors to make sure they have all the facts necessary to weigh the pros and cons of the investment.