The NYSE and the SEC have rules that require the brokers to delivery proxy materials to the stockholders.

FORBES: 'No-Vote Broker Rule' To Shake Up Street

For one thing, it likely renders a company's proxy materials false and misleading.

FORBES: The Next Big Scandal

Southeastern this afternoon renewed its opposition to the Dell-Silver Lake deal, encouraging shareholders to vote against the proposal and promising to release its own proxy materials.

FORBES: Dell, Activist Investors Trade New Blows In Buyout Battle