Are you kidding?

In my position at our company, I often am aware of changes to our loyalty programs, promotions and sales, and other material and immaterial changes prior to broad public knowledge.

There are some seemingly obvious reasons why employees can not and should not share information, some of which you have already stated.

There is a process for public disclosure that needs to be followed. I know at my current company and previous employer's you'd certainly be subject to disciplinary action up to and including dismissal. If you have a role at a public company with access to material information, you face possible other repurcussions as well.

It's not Andrew's role or responsibility to be PR person for AC (though he does so quite well for us on FT on an informal basis), and we need to respect that.