Hi there and thank you for your question,
1. Have I done anything wrong by engaging with CompB? I have provided certain information pertaining to our agents earnings for forecasting reasons. --> If you are only a 30% shareholder in CompA, there is nothing wrong with you engaging CompB to form a partnership, however I am of the view that you should have obtained your co-shareholder's permission before sending out the financial information. Not having obtained the permission could lead to a break-down in the trust relationship with your co-shareholder.
2. As we, CompA, do not have any shareholder agreement, only our registered shareholdings, have I acted wrongfully? --> Lots of companies don't have a shareholders agreement. Not having one will mean that your rights, duties and obligations will need to be proven each time you go to court, instead of being able to rely on a document. See answer above.
3. As the partnership proposal was sent to my partner before discussing with CompB, but information was given out to a third party, have I acted wrongfully? --> Your co-shareholder should have come back to you to say YES or NO in relation to the proposal. The fact that he didn't come back to you speaks volumes. You shouldn't have given out the financial information without his consent. Do you owe your co-shareholder a duty to keep private information private? I would say YES. That means that you have acted wrongfully.
4. Am I within my rights to pursue the partnership within my personal capacity and CompB? By way of looking to work with CompB not in my capacity of shareholder / principle agent of CompA. --> I would say that while you are a shareholder of CompA, you owe the company and your co-shareholders a duty NOT to be a member of another company (e.g. CompB) that offers the same or similar services. If you want to be a shareholder of CompB, my suggestion would be to sell your shares in CompA to your co-shareholder, and then buy shares in CompB. In that way there will be no breach of any duties.
5. Should I remain shareholder and principal agent of CompA, is there a conflict of interests with working with CompB? --> I think that there would be a conflict!
6. Should I remain shareholder and principal agent of CompA, am I within my rights to use information acquired through CompA to benefit CompB? --> No, not really. Typically this information is considered to be confidential information which belongs to CompA. It is not "your" information. It belongs to the CompA. By taking it for CompB's benefit, you are committing a breach of the confidential information.
7. Should I elect to sell or arrange an agreement to hand back my shares in CompA, would I then be able to pursue my / CompA's clients through CompB? --> YES. That's what I've suggested that you do.
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Please note: This answer does not create an attorney-client relationship. Please consult a local attorney in person for legal advice. This information is being provided so you can better discuss legal matters with your attorney.