What insider trading controls prevent
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Insider trading controls prevent individuals with access to material, non-public information about a company from trading its shares based on that advantage, or from passing the information to someone else who might. The underlying concern is fairness: ordinary investors should be competing on equal information, not against people who already know the outcome.
Common controls include trading blackout periods around sensitive announcements such as earnings results, requirements for insiders to pre-clear trades with a compliance officer, and restricted lists identifying employees who currently hold sensitive information about a pending deal or announcement not yet made public to the market.
These controls protect the company as much as individual investors, since a well publicised insider trading case can severely damage a company's reputation and invite lasting regulatory scrutiny, even where only one or two individuals were actually involved in the underlying misconduct that triggered the investigation in the first place, no matter how routine the underlying task might seem.