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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buying shares in a company after you quit
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insider trading is when you buy or sell an investment based on material, non-public information that gives you an unfair advantage over the rest of traders in that market.  working for a company is one way that you might have such information, but whether it is insider trading is not contingent on you working there. you could use that information a long time after leaving the company. you don't even need to have worked there. if a friend/relative gave you non-public information because they work there, it is still insider trading.
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