Look for filings made by TESLA (TSLA) with regulatory agencies. For instance, in the United States, publicly traded companies have to file annual (10-K) and quarterly (10-Q) reports, among a whole array of filings. You can access these reports from the agency websites. If you are assessing a company that is not in the United States, look for the equivalent of the SEC in the country of incorporation and see if you have access to any filings. You will still be able to complete your analysis