What is a 'Form 4' A Form 4 is a document that
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A Form 4 is a document that must be filed with the Securities and Exchange Commission (SEC) whenever there is a material change in the holdings of company insiders. Insiders required to submit a Form 4 include directors and officers of the company as well as any shareholders owning 10% or more of the company's outstanding stock.
http://www.investopedia.com/terms/f/form4.asp