A general term covering anything that a company does that may affect its shareholders. Examples include a share split or a share buyback.

Any event initiated by a corporation which impacts its shareholders. For some...

A corporate action is an action taken by an entity for the purpose of giving an Entitlement to Holders of a class of the entity's securities. Examples of Corporate Actions include rights issues, bonus issues, dividends or other payments, or offers under a buy- back scheme.

a complex and critical event, full of "moving parts" that can have a highly negative effect on the outcome

a decision a company makes that affects the number of shares in issue or the amount of share capital

an action taken by a publicly listed company relating to the entity's securities

Corporate actions are certain events that companies enter into, including, but not limited to, stock splits, stock dividends, corporate acquisitions, and corporate mergers. If your Marketocracy fund has a corporate action that you feel is not reflected correctly, please feel free to send an email to help@marketocracy.com.

Restructuring the ownership of a company, through an action such as a stock split or conversion.

Changes in companies that affect their listings on stock exchanges. Examples of corporate actions are new issues, defunct issues, mergers and name changes.

A corporate event affecting the shares of a company such as a stock split, tender offer, voting etc.

A corporate action is an event taken by a public company that has a direct financial impact on its shareholders. http://www.investopedia.com/terms/c/corporateaction.asp The shareholder's portfolio alteration is associated with cash or share movement. For example, a 2 for 1 stock split doubling a shareholders holdings or a dividend adding a cash payment.