Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

Is there a government-mandated resource that lists the shareholders of a public company?
No, there is no such list, as the other answers mention it is practically impossible to compile one.  However you can see the institutional investors of a public company.  MSN Money has this information available in a fair amount of details.  For example see the Institutional Investors of GOOG