Sorry, sussex, I stand by my statement.  Yes, you DO use the apostrophe when talking about possession - UNLESS you are using instead of the actual noun the word "it", which is an exception.  See Rule 2:

http://data.grammarbook.com/blog/pronouns/1-grammar-error/

Also:



Technically, "ICONOMI's nuts" or "its nuts" are the two correct ways to denote possession of said nuts.

English is a crazy language.