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In 2010 Cameron sold the shares to avoid claims of impropriety as PM. What an honest guy.

Yet, in 2009 he didn't register them with the HoC under their "registration of financial interests" rules, despite the requirement:

REQUIREMENTS FOR REGISTRATION

1. Under this category Members must register:
   a) Any relevant financial interest or material benefit which does not clearly fall into one of the other categories, including any shareholding which falls below the relevant threshold, or any other financial asset, including an asset held in trust, if the Member nevertheless considers that it meets the test of relevance; in other words, that it might reasonably be thought by others to influence his or her actions or words as a Member;
   

http://www.publications.parliament.uk/pa/cm201516/cmcode/1076/107604.htm