Final answer:
To solicit proxy authority for voting shareholder's shares, a party must register with the SEC, which regulates securities activities and ensures informed decisions through a required proxy statement.
Step-by-step explanation:
A party wishing to solicit proxy authority to vote a particular stockholder's shares must register with the Securities and Exchange Commission (SEC). The SEC is a federal agency responsible for enforcing federal securities laws and regulating the securities industry, the nation's stock and options exchanges, and other activities and organizations, including the electronic securities markets in the United States. They require all solicitors of proxy votes to file a proxy statement, which provides stockholders with the information necessary to make informed decisions about matters that will be brought up at an annual or special stockholder's meeting.