Classification

Securities may be classified according to the following categories:
Issuer
Currency of denomination
Ownership rights
Term to maturity
Degree of liquidity
Income payments
Tax treatment
Credit Rating
Industrial Sector
Region or Country
Market Capitalization

By Type of Issuer
Issuers of securities include commercial companies, government agencies, local authorities and international and supranational organizations (such as the World Bank). Debt securities issued by a government (called government bonds or sovereign bonds) generally carry a lower interest rate than corporate debt issued by commercial companies. Interests in an asset -- for example, the flow of royalty payments from intellectual property-may also be turned into securities. These repackaged securities resulting from a securitization are usually issued by a company established for the purpose of the repackaging-called a special purpose vehicle (SPV). See "Repackaging" below. SPVs are also used to issue other kinds of securities. SPVs can also be used to guarantee securities, such as covered bonds.
New capital: Commercial enterprises have traditionally used securities as a means of raising new capital. Securities may be an attractive option relative to bank loans depending on their pricing and market demand for particular characteristics. Another disadvantage of bank loans as a source of financing is that the bank may seek a measure of protection against default by the borrower via extensive financial covenants. Through securities, capital is provided by investors who purchase the securities upon their initial issuance. In a similar way, governments may raise capital through the issuance of securities (see government debt).
Repackaging: In recent decades securities have been issued to repackage existing assets. In a traditional securitisation, a financial institution may wish to remove assets from its balance sheet in order to achieve regulatory capital efficiencies or to accelerate its receipt of cash flow from the original assets. Alternatively, an intermediary may wish to make a profit by acquiring financial assets and repackaging them in a way which makes them more attractive to investors.

By Type of Holder
Investors in securities may be retail, i.e. members of the public investing other than by way of business. The greatest part in terms of volume of investment is wholesale, i.e. by financial institutions acting on their own account, or on behalf of clients. Important institutional investors include investment banks, insurance companies, pension funds and other managed funds.
Investment: The traditional economic function of the purchase of securities is investment, with the view to receiving income and/or achieving capital gain. Debt securities generally offer a higher rate of interest than bank deposits, and equities may offer the prospect of capital growth. Equity investment may also offer control of the business of the issuer. Debt holdings may also offer some measure of control to the investor if the company is a fledgling start-up or an old giant undergoing 'restructuring'. In these cases, if interest payments are missed, the creditors may take control of the company and liquidate it to recover some of their investment.
Collateral: The last decade has seen an enormous growth in the use of securities as collateral. Purchasing securities with borrowed money secured by other securities is called "buying on margin." Where A is owed a debt or other obligation by B, A may require B to deliver property rights in securities to A. These property rights enable A to satisfy its claims in the event that B becomes insolvent. Collateral arrangements are divided into two broad categories, namely security interests and outright collateral transfers. Commonly, commercial banks, investment banks and government agencies are significant collateral takers.