The main public source for financial statements is the Securities and Exchange Commission's database EDGAR (see link below).
For public companies, you can also find their 10-K or annual statement (referred to as the "glossy," which includes a letter to shareholders followed by the 10-K) on their shareholder or investor relations website. A simple search (in Google, Bing, DuckDuckGo, etc.) for "[the company's name] investor relations" (e.g., Southwest Airlines investor relations) should result in the right site. From there, look for mention of filings, financial statements, annual statements, or company reports. At a minimum they should provide the "glossy", but some will provide all SEC filings. Examples: Southwest Airlines, Apple, and Sprouts Farmers Market
All public companies, U.S. and foreign, are required to file registration statements, periodic reports, and other forms through EDGAR. Anyone can access and download this information for free. For annual financial statements, select a company's 10-K. If you aren't sure which form you need, use the link for SEC Forms List (PDF versions) and look at the form descriptions.
You may be prompted to login with your UA NetID to enter these sites. Follow the instructions below each database link to find financial statements.
Nexis Uni Company Dossiers act as profiles with access to basic info, financials, news, reports, legal cases, and more. Go to Menu (upper left corner, next to Nexis Uni name), then click on Company Dossier. Adjust the drop-down field to search either by company name or stock ticker. If one does not work for your company (e.g., Ford's stock ticker F produces no relevant results), try the other. Once inside Company Dossier search, never click on "Return to Nexis Uni" or the waffle icon in the left corner. Always use the small links in the right corner for Edit search, New search, or Return to results.