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What is insider trading exactly?
One scenario described in the original question -- a non-insider who trades after informal conversations with friends, where no insiders directly benefit from any such disclosure -- might not be illegal.  (IANAL -- this is just my personal interpretation of articles in the news recently.) http://www.bloomberg.com/news/articles/2015-10-05/insider-trading-cases-imperiled-as-top-u-s-court-spurns-appeal the appeals court said prosecutors needed to show that the person disclosing the information received a clear benefit -- something more than the nurturing of a friendship ... In a 1980 case the Supreme Court rejected the idea of “a general duty between all participants in market transactions to forgo actions based on material, nonpublic information."