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Acorporate action is an event initiated by apublic company that brings or could bring an actual change to the debt securities—equity ordebt—issued by the company. Corporate actions are typically agreed upon by a company'sboard of directors and authorized by theshareholders. For some events, shareholders or bondholders are permitted to vote on the event. Examples of corporate actions includestock splits,dividends,mergers and acquisitions,rights issues, andspin-offs.[1]
Some corporate actions such as adividend (for equity securities) orcoupon payment (for debt securities) may have a direct financial impact on theshareholders or bondholders; another example is a call (early redemption) of a debt security. Other corporate actions such asstock split may have an indirect financial impact, as the increased liquidity of shares may cause the price of the stock to decrease. Some corporate actions, such as name changes orticker symbol changes to better reflect a company's business focus, have no direct financial impact on the shareholders; securities may be listed under a different security identifier (e.g.ISIN,CUSIP,Sedol) however.[2] For example, "Apple Computers" changed its name toApple Inc.[3]
There are three types of corporate actions: voluntary, mandatory, and mandatory with choice.[4]
Some market participants use a different method to distinguish the corporate action types. For example, "mandatory corporate action" and "mandatory with choice corporate action" may be used together.DTC uses the terms distributions, redemptions and reorganizations.

The primary reasons companies use corporate actions are:

As an owner, the impact of a corporate action is usually measured in terms of changes to thesecurities and/orcash positions, so corporate actions can be divided into two categories:
In order to keep investors and the market informed of corporate actions, they need to be announced. Forpublic companies listed on exchanges, the exchanges themselves handle the announcement, notifying shareholders as well as making information about the corporate action available online. For companies that trade in theover-the-counter (OTC) marketplace, U.S. federal securities regulators taskFinancial Industry Regulatory Authority (FINRA), a self-regulatory organization, with processing the corporate action announcement.[2]
The event information flow for public companies where shareholders or bondholders can vote usually involves numerous parties. The information is first announced by the company to the exchange. Financial data companies which provide economic and financial data to customers collect such information and disseminate it via their own services to banks,institutional investors, managed service providers, and other market participants. In addition, thecentral securities depository (CSD) of the respective market collects the data and informs the CSD participants holding the respective share or bond in custody about the upcoming corporate action. The CSD sets a deadline for its participants by which the elections must be returned. The CSD participants then further disseminate the information to its clients (e.g. banks, institutional investors or private clients), which in turn must submit their election by the deadline set by the CSD participant.