Are all US public companies required to maintain a website where they publish press releases and financial statements? If so, do such requirements only apply to exchange-listed companies, or are OTC stocks subject to such requirements too? I am asking because I want to know whether or not an investor relations website is guaranteed to exist for any given US public company.
Short answer: no.
I am pretty darn sure that the only requirements to be a publicly traded company is that said company meets all the standards to be public traded and files the necessary forms correctly and on-time with the Securities and Exchange Commission, which will then make those forms publicly available.
There is not legal requirement that a company maintains an investor relations webpage or I think even have an investor relations department.