as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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insider trading in another company?
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this information is clearly "material" (large impact) and "non-public" according to the statement of the problem.  also, decisions like united states v. carpenter make it clear that you do not need to be a member of the company to do illegal insider trading on its stock. importantly though, stackexchange is not a place for legal advice and this answer should not be construed as such.  legal/compliance at company a would be a good place to start asking questions.
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