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Why is Insider Trading Illegal?
A practical issue is that insider trading transfers wealth from most investors to the few insiders. If this were permitted, non-insiders would rarely make any money, and they'd stop investing. That would then defeat the purpose of the capital markets which is to attract capital. A moral issue is that managers and operators of a company should act in shareholders' interests. Insider trading directly takes money from other shareholders and transfers it to the insider. It's a nasty conflict of interest (and would allow any CEO of a public company to make ton of money quickly, regardless of their job performance). In short, shareholders and management should succeed or suffer together, so their interests are as aligned as possible and managers have the proper incentives.