Some style manuals require that a "retrieved" date be included. APA does not, except in cases where the content may change over time. Company website citations should include the date that the cited content was accessed.
- Chipotle. (n.d.). Food with integrity. Retrieved August 31, 2015 from http://chipotle.com/food-with-integrity
In this case, treat the organization as the author. We can be fairly certain that any content (aside from reviews or blog comments) was written on behalf of the company. We would not consider the author to be "Anonymous," even though no individual author is named.
If the content is not dated, use "n.d." in the place where you would normally put the publication date.
