I'm not clear why you mention insider trading here? Insiders have access to information that is not present public information, and so is not priced into the current value of the stock.
The the strong form of the EMH includes inside info, all info in existence.
Yes, but no one claims that the market is strong form efficient. The question is rather whether the U.S. stock and bond markets are weak form (prices include all past trading data) or semi-strong form efficient (prices include all publicly available information).