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Security (finance)
Security (finance)
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A security is a tradable financial asset. The term commonly refers to any form of financial instrument, but its legal definition varies by jurisdiction. In some countries and languages people commonly use the term "security" to refer to any form of financial instrument, even though the underlying legal and regulatory regime may not have such a broad definition. In some jurisdictions the term specifically excludes financial instruments other than equity and fixed income instruments. In some jurisdictions it includes some instruments that are close to equities and fixed income, e.g., equity warrants.

Securities may be represented by a certificate or, more typically, they may be "non-certificated", that is in electronic (dematerialized) or "book entry only" form. Certificates may be bearer, meaning they entitle the holder to rights under the security merely by holding the security, or registered, meaning they entitle the holder to rights only if they appear on a security register maintained by the issuer or an intermediary. They include shares of corporate capital stock or mutual funds, bonds issued by corporations or governmental agencies, stock options or other options, limited partnership units, and various other formal investment instruments that are negotiable and fungible.

United Kingdom and United States

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In the United Kingdom, the Financial Conduct Authority functions as the national competent authority for the regulation of financial markets; the definition in its Handbook of the term "security"[1] applies only to equities, debentures, alternative debentures, government and public securities, warrants, certificates representing certain securities, units, stakeholder pension schemes, personal pension schemes, rights to or interests in investments, and anything that may be admitted to the Official List.

In the United States, a "security" is a tradable financial asset of any kind.[2] Securities can be broadly categorized into:

The company or other entity issuing the security is called the issuer. A country's regulatory structure determines what qualifies as a security. For example, private investment pools may have some features of securities, but they may not be registered or regulated as such if they meet various restrictions.

Securities are the traditional method used by commercial enterprises to raise new capital. They may offer an attractive alternative to bank loans - depending on their pricing and market demand for particular characteristics. A 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, a government may issue securities when it chooses to increase government debt.

Debt and equity

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Securities are traditionally divided into debt securities and equities.

Debt

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Debt securities may be called debentures, bonds, deposits, notes or commercial paper depending on their maturity, collateral and other characteristics. The holder of a debt security is typically entitled to the payment of principal and interest, together with other contractual rights under the terms of the issue, such as the right to receive certain information. Debt securities are generally issued for a fixed term and redeemable by the issuer at the end of that term. Debt securities may be protected by collateral or may be unsecured, and, if they are unsecured, may be contractually "senior" to other unsecured debt meaning their holders would have a priority in a bankruptcy of the issuer. Debt that is not senior is "subordinated".

Corporate bonds represent the debt of commercial or industrial entities. Debentures have a long maturity, typically at least ten years, whereas notes have a shorter maturity. Commercial paper is a simple form of debt security that essentially represents a post-dated cheque with a maturity of not more than 270 days.

Money market instruments are short term debt instruments that may have characteristics of deposit accounts, such as certificates of deposit, Accelerated Return Notes (ARN), and certain bills of exchange. They are highly liquid and are sometimes referred to as "near cash". Commercial paper is also often highly liquid.

Euro debt securities are securities issued internationally outside their domestic market in a denomination different from that of the issuer's domicile. They include eurobonds and euronotes. Eurobonds are characteristically underwritten, and not secured, and interest is paid gross. A euronote may take the form of euro-commercial paper (ECP) or euro-certificates of deposit.

Government bonds are medium or long term debt securities issued by sovereign governments or their agencies. Typically they carry a lower rate of interest than corporate bonds, and serve as a source of finance for governments. U.S. federal government bonds are called treasuries. Because of their liquidity and perceived low risk, treasuries are used to manage the money supply in the open market operations of non-US central banks.

Sub-sovereign government bonds, known in the U.S. as municipal bonds, represent the debt of state, provincial, territorial, municipal or other governmental units other than sovereign governments.

Supranational bonds represent the debt of international organizations such as the World Bank,[3] the International Monetary Fund,[4] regional multilateral development banks like the African Development[5] Bank and the Asian Development Bank,[6] and others.

Equity

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An equity security is a share of equity interest in an entity such as the capital stock of a company, trust or partnership. The most common form of equity interest is common stock, although preferred equity is also a form of capital stock. The holder of an equity is a shareholder, owning a share, or fractional part of the issuer. Unlike debt securities, which typically require regular payments (interest) to the holder, equity securities are not entitled to any payment. In bankruptcy, they share only in the residual interest of the issuer after all obligations have been paid out to creditors. However, equity generally entitles the holder to a pro rata portion of control of the company, meaning that a holder of a majority of the equity is usually entitled to control the issuer. Equity also enjoys the right to profits and capital gain, whereas holders of debt securities receive only interest and repayment of principal regardless of how well the issuer performs financially. Furthermore, debt securities do not have voting rights outside of bankruptcy. In other words, equity holders are entitled to the "upside" of the business and to control the business.

Hybrid

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Hybrid securities combine some of the characteristics of both debt and equity securities.

Preference shares form an intermediate class of security between equities and debt. If the issuer is liquidated, preference shareholders have the right to receive interest or a return of capital prior to ordinary shareholders. However, from a legal perspective, preference shares are capital stocks and therefore may entitle the holders to some degree of control depending on whether they carry voting rights.

Convertibles are bonds or preferred stocks that can be converted, at the election of the holder of the convertibles, into the ordinary shares of the issuing company. The convertibility, however, may be forced if the convertible is a callable bond, and the issuer calls the bond. The bondholder has about one month to convert it, or the company will call the bond by giving the holder the call price, which may be less than the value of the converted stock. This is referred to as a forced conversion.

Equity warrants are options issued by the company that allow the holder of the warrant to purchase a specific number of shares at a specified price within a specified time. They are often issued together with bonds or existing equities, and are, sometimes, detachable from them and separately tradeable. When the holder of the warrant exercises it, he pays the money directly to the company, and the company issues new shares to the holder.

Warrants, like other convertible securities, increases the number of shares outstanding, and are always accounted for in financial reports as fully diluted earnings per share, which assumes that all warrants and convertibles will be exercised.

Classification

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Securities may be classified according to many categories or classification systems:

  • Currency of denomination
  • Ownership rights
  • Terms to maturity
  • Degree of liquidity
  • Income payments
  • Tax treatment
  • Credit rating
  • Industrial sector or "industry". ("Sector" often refers to a higher level or broader category, such as Consumer Discretionary, whereas "industry" often refers to a lower level classification, such as Consumer Appliances. See Industry for a discussion of some classification systems.)
  • Region or country (such as country of incorporation, country of principal sales/market of its products or services, or country in which the principal securities exchange where it trades is located)
  • Market capitalization
  • State (typically for municipal or "tax-free" bonds in the US)

Type of holder

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Investors in securities may be retail, i.e., members of the public investing personally, other than by way of business.

In distinction, the greatest part of investment in terms of volume, 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. The "wholesaler" is typically an underwriter or a broker-dealer who trades with other broker-dealers, rather than with the retail investor.[7]

This distinction carries over to banking; compare Retail banking and Wholesale banking.

Investment

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The traditional economic function of the purchase of securities is investment, with the view to receiving income 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

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The last decade has seen an enormous growth in the use of securities as collateral. Purchasing securities with borrowed money secured by other securities or cash itself 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, either at inception (transfer of title) or only in default (non-transfer-of-title institutional). For institutional loans, property rights are not transferred but nevertheless enable A to satisfy its claims in case B fails to make good on its obligations to A or otherwise becomes insolvent. Collateral arrangements are divided into two broad categories, namely security interests and outright collateral transfers. Commonly, commercial banks, investment banks, government agencies and other institutional investors such as mutual funds are significant collateral takers as well as providers. In addition, private parties may utilize stocks or other securities as collateral for portfolio loans in securities lending scenarios.

On the consumer level, loans against securities have grown into three distinct groups over the last[which?] decade:

  1. Standard Institutional Loans, generally offering low loan-to-value with very strict call and coverage regimens, akin to standard margin loans;
  2. Transfer-of-Title (ToT) Loans, typically provided by private parties where borrower ownership is completely extinguished save for the rights provided in the loan contract; and
  3. Non-Transfer-of-Title Credit Line facilities where shares are not sold and they serve as assets in a standard lien-type line of cash credit.

Of the three, transfer-of-title loans have fallen into the very high-risk category as the number of providers has dwindled as regulators have launched an industry-wide crackdown on transfer-of-title structures where the private lender may sell or sell short the securities to fund the loan. Institutionally managed consumer securities-based loans on the other hand, draw loan funds from the financial resources of the lending institution, not from the sale of the securities.

Collateral and sources of collateral are changing, in 2012 gold became a more acceptable form of collateral.[8] By 2015, recently Exchange-traded funds (ETFs) previously seen by many as unpromising had started to become more readily available and acceptable.[9]

Markets

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Primary and secondary market

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Public securities markets are either primary or secondary markets. In the primary market, the money for the securities is received by the issuer of the securities from investors, typically in an initial public offering (IPO). In the secondary market, the securities are simply assets held by one investor selling them to another investor, with the money going from one investor to the other.

An initial public offering is when a company issues public stock newly to investors, called an "IPO" for short. A company can later issue more new shares, or issue shares that have been previously registered in a shelf registration. These later new issues are also sold in the primary market, but they are not considered to be an IPO, and are often called a "secondary offering". Issuers usually retain investment banks to assist them in administering the IPO, obtaining regulatory approval of the offering filing, and selling the new issue. When the investment bank buys the entire new issue from the issuer at a discount to resell it at a markup, it is called a firm commitment underwriting. However, if the investment bank considers the risk too great for an underwriting, it may only assent to a best effort agreement, where the investment bank will simply do its best to sell the new issue.

For the primary market to thrive, there must be a secondary market, or aftermarket that provides liquidity for the investment security—where holders of securities can sell them to other investors for cash. Otherwise, few people would purchase primary issues, and, thus, companies and governments would be restricted in raising equity capital (money) for their operations. Organized exchanges constitute the main secondary markets. Many smaller issues and most debt securities trade in the decentralized, dealer-based over-the-counter markets.

In Europe, the principal trade organization for securities dealers is the International Capital Market Association.[10] In the U.S., the principal trade organization for securities dealers is the Securities Industry and Financial Markets Association,[11] which is the result of the merger of the Securities Industry Association and the Bond Market Association. The Financial Information Services Division of the Software and Information Industry Association (FISD/SIIA)[12] represents a round-table of market data industry firms, referring to them as Consumers, Exchanges, and Vendors. In India the equivalent organisation is the securities exchange board of India (SEBI).

Public offer and private placement

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In the primary markets, securities may be offered to the public in a public offering. Alternatively, they may be offered privately to a limited number of qualified persons in a private placement. Sometimes a combination of the two is used. The distinction between the two is important to securities regulation and company law. Privately placed securities are not publicly tradable and may only be bought and sold by sophisticated qualified investors. As a result, the secondary market is not nearly as liquid as it is for public (registered) securities.

Another category, sovereign bonds, is generally sold by auction to a specialized class of dealers.

Listing and over-the-counter dealing

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Securities are often listed in a stock exchange, an organized and officially recognized market on which securities can be bought and sold. Issuers may seek listings for their securities to attract investors, by ensuring there is a liquid and regulated market that investors can buy and sell securities in.

Growth in informal electronic trading systems has challenged the traditional business of stock exchanges. Large volumes of securities are also bought and sold "over the counter" (OTC). OTC dealing involves buyers and sellers dealing with each other by telephone or electronically on the basis of prices that are displayed electronically, usually by financial data vendors such as SuperDerivatives, Reuters, Investing.com and Bloomberg.

There are also eurosecurities, which are securities that are issued outside their domestic market into more than one jurisdiction. They are generally listed on the Luxembourg Stock Exchange or admitted to listing in London. The reasons for listing eurobonds include regulatory and tax considerations, as well as the investment restrictions.

Securities services

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Securities Services refers to the products and services that are offered to institutional clients that issue, trade, and hold securities. The bank engaged in securities services are usually called a custodian bank. Market players include BNY Mellon, J.P. Morgan, HSBC, Citi, BNP Paribas, Société Générale etc.

Market

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London is the centre of the eurosecurities markets. There was a huge rise in the eurosecurities market in London in the early 1980s. Settlement of trades in eurosecurities is currently effected through two international central securities depositories, namely Euroclear Bank (in Belgium) and Clearstream Banking SA (formerly Cedel, in Luxembourg).

The main market for Eurobonds is the EuroMTS, owned by Borsa Italiana and Euronext. There are ramp up market in Emergent countries, but it is growing slowly.

Physical nature

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Certificated securities

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Securities that are represented in paper (physical) form are called certificated securities. They may be bearer or registered.

DRS securities

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Securities may also be held in the Direct Registration System (DRS), which is a method of recording shares of stock in book-entry form. Book-entry means the company's transfer agent maintains the shares on the owner's behalf without the need for physical share certificates. Shares held in un-certificated book-entry form have the same rights and privileges as shares held in certificated form.

Bearer securities

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1969 $100,000 Treasury Bill

Bearer securities are completely negotiable and entitle the holder to the rights under the security (e.g., to payment if it is a debt security, and voting if it is an equity security). They are transferred by delivering the instrument from person to person. In some cases, transfer is by endorsement, or signing the back of the instrument, and delivery.

Regulatory and fiscal authorities sometimes regard bearer securities negatively, as they may be used to facilitate the evasion of regulatory restrictions and tax. In the United Kingdom, for example, the issue of bearer securities was heavily restricted firstly by the Exchange Control Act 1947 until 1953. Bearer securities are very rare in the United States because of the negative tax implications they may have to the issuer and holder.

In Luxembourg, the law of 28 July 2014 concerning the compulsory deposit and immobilization of shares and units in bearer form adopts the compulsory deposit and immobilization of bearer shares and units with a depositary allowing identification of the holders thereof.

Registered securities

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1981 $10,000 15.875% Registered Note

In the case of registered securities, certificates bearing the name of the holder are issued, but these merely represent the securities. A person does not automatically acquire legal ownership by having possession of the certificate. Instead, the issuer (or its appointed agent) maintains a register in which details of the holder of the securities are entered and updated as appropriate. A transfer of registered securities is effected by amending the register.

Non-certificated securities and global certificates

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Modern practice has developed to eliminate both the need for certificates and maintenance of a complete security register by the issuer. There are two general ways this has been accomplished.

Non-certificated securities

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In some jurisdictions, such as France, it is possible for issuers of that jurisdiction to maintain a legal record of their securities electronically.

In the United States, the current "official" version of Article 8 of the Uniform Commercial Code permits non-certificated securities. However, the "official" UCC is a mere draft that must be enacted individually by each U.S. state. Though all 50 states (as well as the District of Columbia and the U.S. Virgin Islands) have enacted some form of Article 8, many of them still appear to use older versions of Article 8, including some that did not permit non-certificated securities.[13]

Global certificates, book entry interests, depositories

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To facilitate the electronic transfer of interests in securities without dealing with inconsistent versions of Article 8, a system has developed whereby issuers deposit a single global certificate representing all the outstanding securities of a class or series with a universal depository. This depository is called The Depository Trust Company, or DTC. DTC's parent, Depository Trust & Clearing Corporation (DTCC), is a non-profit cooperative owned by approximately thirty of the largest Wall Street players that typically act as brokers or dealers in securities. These thirty banks are called the DTC participants. DTC, through a legal nominee, owns each of the global securities on behalf of all the DTC participants.

All securities traded through DTC are in fact held, in electronic form, on the books of various intermediaries between the ultimate owner, e.g., a retail investor, and the DTC participants. For example, Mr. Smith may hold 100 shares of Coca-Cola, Inc. in his brokerage account at local broker Jones & Co. brokers. In turn, Jones & Co. may hold 1000 shares of Coca-Cola on behalf of Mr. Smith and nine other customers. These 1000 shares are held by Jones & Co. in an account with Goldman Sachs, a DTC participant, or in an account at another DTC participant. Goldman Sachs in turn may hold millions of Coca-Cola shares on its books on behalf of hundreds of brokers similar to Jones & Co. Each day, the DTC participants settle their accounts with the other DTC participants and adjust the number of shares held on their books for the benefit of customers like Jones & Co. Ownership of securities in this fashion is called beneficial ownership. Each intermediary holds on behalf of someone beneath him in the chain. The ultimate owner is called the beneficial owner. This is also referred to as owning in "Street name".

Among brokerages and mutual fund companies, a large amount of mutual fund share transactions take place among intermediaries as opposed to shares being sold and redeemed directly with the transfer agent of the fund. Most of these intermediaries such as brokerage firms clear the shares electronically through the National Securities Clearing Corp. or "NSCC", a subsidiary of DTCC.

Other depositories

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Besides DTC in the US, central securities depositories (CSDs) exist on a national basis in most jurisdictions. In addition, two major international CSDs exist, both based in Europe, namely Euroclear Bank and Clearstream Banking SA.

Divided and undivided security

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The terms "divided" and "undivided" relate to the proprietary nature of a security.

Each divided security constitutes a separate asset, which is legally distinct from each other security in the same issue. Pre-electronic bearer securities were divided. Each instrument constitutes the separate covenant of the issuer and is a separate debt.

With undivided securities, the entire issue makes up one single asset, with each of the securities being a fractional part of this undivided whole. Shares in the secondary markets are always undivided. The issuer owes only one set of obligations to shareholders under its memorandum, articles of association and company law. A share represents an undivided fractional part of the issuing company. Registered debt securities also have this undivided nature.

Fungible and non-fungible securities

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In a fungible security, all holdings of the security are treated identically and are interchangeable.

Sometimes securities are not fungible with other securities, for example different series of bonds issued by the same company at different times with different conditions attaching to them.

Regulation

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In the US, the public offer and sale of securities must be either registered pursuant to a registration statement that is filed with the U.S. Securities and Exchange Commission (SEC) or are offered and sold pursuant to an exemption therefrom. Dealing in securities is regulated by both federal authorities (SEC) and state securities departments. In addition, the brokerage industry is supposedly self policed by self-regulatory organizations (SROs), such as the Financial Industry Regulatory Authority (FINRA), formerly the National Association of Securities Dealers (or NASD), or the Municipal Securities Rulemaking Board (MSRB).

With respect to investment schemes that do not fall within the traditional categories of securities listed in the definition of a security (Sec. 2(a)(1) of the Securities Act of 1933 and Sec. 3(a)(10) of the 34 act) the US Courts have developed a broad definition for securities that must then be registered with the SEC. When determining if there is an "investment contract" that must be registered the courts look for an investment of money, a common enterprise and expectation of profits to come primarily from the efforts of others. See SEC v. W.J. Howey Co.

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia
from Grokipedia
In finance, a is a tradable representing monetary value, typically embodying an ownership interest, a relationship, or to future flows or assets. Under U.S. , the term "" is broadly defined in Section 2(a)(1) of the to include any note, , , security future, security-based swap, bond, , evidence of indebtedness, certificate of interest or participation in a profit-sharing agreement, , and numerous other instruments or interests commonly known as securities. This ensures comprehensive of products to protect investors and promote market integrity. Securities serve as essential tools for , allowing governments, corporations, and other entities to raise funds by issuing these instruments to investors in exchange for capital. They are traded in primary markets during initial issuance and in secondary markets, such as stock exchanges or over-the-counter platforms, where and occur. The U.S. Securities and Exchange Commission (SEC) oversees these markets to maintain fairness, order, and efficiency while prohibiting in securities transactions. The primary categories of securities include equity securities, which confer ownership stakes in an entity (e.g., common or preferred ); debt securities, which represent borrowed funds repayable with interest (e.g., bonds and notes); , which derive value from underlying assets (e.g., options and futures); and hybrid securities, combining elements of equity and debt (e.g., convertible bonds). Equity securities offer potential for capital appreciation and dividends but carry higher tied to the issuer's , while debt securities provide more predictable income through fixed payments, generally with lower backed by the issuer's creditworthiness. enable hedging, , or leverage but introduce complexities like counterparty . Beyond classification, securities markets play a in by channeling savings into productive investments, diversifying for s, and providing benchmarks for valuation through indices and mechanisms. Innovations such as exchange-traded funds have expanded access and efficiency, though they also raise regulatory challenges related to transparency and systemic stability. Overall, securities form the backbone of modern financial systems, balancing opportunity with oversight to foster confidence.

Definition and Fundamentals

Definition

In finance, a security is a tradable financial instrument that represents an ownership position in a corporation (equity security), a creditor relationship with a governmental body or corporation (debt security), or rights to ownership as represented by an investor's option to buy or sell (derivative security). In the United States, the Securities Act of 1933 provides the foundational legal definition in Section 2(a)(1), encompassing any note, stock, treasury stock, bond, debenture, evidence of indebtedness, certificate of interest or participation in any profit-sharing agreement, collateral-trust certificate, preorganization certificate or subscription, transferable share, investment contract, or, in general, any interest or instrument commonly known as a "security." This broad enumeration ensures comprehensive regulation of instruments used for capital raising and investment. In the , the Financial Services and Markets Act 2000 (FSMA) defines securities through its regulated activities framework, primarily in Schedule 2, where "investments" include shares (such as stock in a company's or rights to share in its capital or income), debentures (instruments acknowledging indebtedness issued by a company), and government securities (shares, stock, or debentures issued by entities formed under foreign law and specified by Treasury order). These definitions delineate the scope of financial instruments subject to oversight by the , emphasizing negotiable claims rather than direct assets. Securities differ fundamentally from non-securities such as cash or commodities; cash constitutes or equivalents like bank deposits used as a , while commodities refer to physical goods (e.g., , ) or standardized contracts for future delivery of such goods, lacking the representational claim on an issuer's assets or earnings inherent in securities. This distinction is critical for regulatory purposes, as securities fall under securities laws enforced by bodies like the U.S. Securities and Exchange Commission, whereas commodities are primarily regulated by the . Economically, securities play a pivotal role in financial systems by facilitating capital raising for issuers, providing through trading, and enabling risk transfer between investors and entities. For instance, corporations issue to raise equity capital for expansion, allowing investors to share in profits and growth, while bonds serve as obligations promising periodic interest and principal repayment. These mechanisms enhance , channeling savings into productive investments and mitigating information asymmetries in the economy.

Historical Development

The origins of financial securities trace back to ancient around 2000 BCE, where clay tablets served as rudimentary debt receipts and records of obligations, marking early forms of instruments used in and taxation. These tablets, inscribed with script, documented loans of grain, silver, and livestock, facilitating economic transactions in city-states like and enabling the tracking of debts that could span generations. In medieval , the concept evolved with the introduction of bills of exchange in 12th-century , particularly in and , where merchants used these negotiable instruments to transfer funds across regions without physical coin transport, reducing risks associated with long-distance . A pivotal milestone occurred in 1602 when the (VOC) issued the world's first publicly traded shares through an , allowing investors to buy stakes in its global trading ventures and enabling share trading on the Amsterdam Stock Exchange. This innovation democratized investment and laid the groundwork for organized equity markets. In the United States, the 1792 , signed by 24 brokers under a buttonwood tree on , established rules for securities trading, commissions, and auctions, serving as the precursor to the (NYSE) and formalizing the U.S. . During the 19th-century , bonds proliferated as governments and corporations issued debt securities to finance infrastructure, railways, and factories, with Britain's sovereign debt playing a key role in reallocating capital from agriculture to high-return industries, accelerating economic transformation. Post-World War II, the U.S. expanded through government-sponsored enterprises like , which in the 1950s purchased conventional mortgages to enhance and promote homeownership. A securitization boom followed, beginning with the (Ginnie Mae) issuing the first mortgage-backed securities in 1970; began issuing such securities in 1981. In the 1970s, the dematerialization of securities addressed the "paperwork crisis" from surging trading volumes, with the founding of the (DTC) in 1973 introducing electronic book-entry systems that immobilized physical certificates and streamlined settlement. The , triggered by opaque mortgage-backed securities, prompted global regulatory reforms enhancing transparency, such as the Dodd-Frank Act's requirements for over-the-counter derivatives reporting and risk disclosures to mitigate systemic risks. In the post-2010s digital era, blockchain technology advanced securities through tokenization, exemplified by the ERC-1400 standard introduced in 2018, which enables compliant, interoperable security tokens representing traditional assets like shares and bonds on distributed ledgers.

Types of Securities

Debt Securities

Debt securities, also known as fixed-income securities, are financial instruments through which an borrows funds from s and agrees to repay the principal amount, or , at a predetermined maturity date. In exchange, the issuer makes periodic interest payments, referred to as payments, to the bondholders throughout the term of the . These securities represent a obligation rather than an ownership stake, granting holders creditor status with a higher priority claim on the issuer's assets in the event of compared to equity holders. The core characteristics of debt securities include the repayment of principal at maturity, which ensures the return of the invested capital if the issuer does not default, and the provision of fixed or floating payments that provide a predictable stream. Maturity dates can range from short-term (less than one year) to long-term (over 30 years), influencing the security's sensitivity to market conditions. In proceedings, debt security holders rank ahead of equity investors in asset , enhancing their relative security but exposing them to specific risks tied to the issuer's creditworthiness and broader economic factors. Common types of debt securities include government bonds, such as U.S. Treasuries issued by the Department of the Treasury to federal operations; corporate bonds, issued by companies to fund activities; and municipal bonds, issued by state and local governments to support public projects like infrastructure. Zero-coupon bonds represent a distinct variant, where no periodic interest payments are made; instead, these bonds are sold at a significant discount to their and redeemed at par upon maturity, with the difference implying the investor's return. Pricing of debt securities is fundamentally determined by the of future cash flows, discounted at the prevailing market yield. The (YTM) serves as a comprehensive measure of the if the is held until maturity, accounting for payments, principal repayment, and the purchase price. The approximation formula for YTM is: YTMC+(FP)n(F+P)2\text{YTM} \approx \frac{C + \frac{(F - P)}{n}}{\frac{(F + P)}{2}} where CC is the annual payment, FF is the , PP is the current price, and nn is the number of years to maturity. To arrive at this approximation, recognize that the exact YTM is the internal rate of return (IRR) solving the bond pricing equation: P=t=1nC(1+YTM)t+F(1+YTM)nP = \sum_{t=1}^{n} \frac{C}{(1 + \text{YTM})^t} + \frac{F}{(1 + \text{YTM})^n} This requires iterative numerical methods like Newton-Raphson for precision. The approximation simplifies by treating the coupon as steady income and amortizing the discount (or premium) linearly over the term: the numerator adds the annual coupon to the average annual capital gain/loss (FP)/n(F - P)/n, while the denominator uses the average of face and purchase price as the effective investment base. This yields a reasonable estimate for bonds trading near par, with errors increasing for deep discounts or long maturities; for example, a 10-year bond with $1,000 face value, 5% coupon ($50 annual), and $900 price gives YTM ≈ [50 + (100)/10] / [(1000 + 900)/2] = 60 / 950 ≈ 6.32%, close to the exact IRR of about 6.38%. Debt securities are exposed to several key risks, including , where rising market rates lead to falling bond prices due to the inverse relationship between yields and values, and , the possibility that the issuer defaults on payments. is assessed through ratings from agencies like Moody's and S&P, which use scales from highest quality (Aaa/AAA) indicating minimal default risk, through investment-grade levels (Baa3/BBB- and above), to speculative grades (Ba1/BB+ and below), down to D/C for default. Specialized debt securities have emerged to address environmental and inflationary concerns. Green bonds are debt instruments where proceeds are exclusively allocated to sustainable projects, such as renewable energy or pollution control, with issuance surging after the 2015 as investors sought climate-aligned investments; cumulative issuance exceeded $500 billion by 2019. Inflation-linked bonds, like U.S. Treasury Inflation-Protected Securities (TIPS) introduced in 1997, adjust principal and interest payments based on the to preserve against .

Equity Securities

Equity securities represent ownership interests in a corporation or other business entity, entitling holders to a residual claim on the entity's assets and after all and other obligations are satisfied. Unlike debt securities, which provide fixed claims, equity holders bear the highest risk in but enjoy unlimited upside potential from the entity's growth and profitability. These securities are typically issued as shares of and form the foundation of public and markets. The two primary types of equity securities are common stock and preferred stock. Common stock provides shareholders with voting rights on key corporate matters, such as electing the board of directors and approving major transactions, as well as the potential to receive dividends, though these are not guaranteed and are declared at the discretion of the board. Preferred stock, in contrast, offers holders priority over common stockholders in receiving fixed dividends and in asset distribution during liquidation, but it usually lacks voting rights unless specified in the terms or in cases of dividend arrears. Both types expose investors to the entity's operational risks, with common stock positioned last in the capital structure hierarchy. Shareholders of typically exercise at annual or special meetings to influence , ensuring alignment with owner interests. Additionally, preemptive allow existing shareholders to purchase new shares issuances pro-rata before they are offered to the , thereby maintaining their proportional ownership and preventing dilution of their stake. These are statutory in many jurisdictions but can be waived by the with shareholder approval. Valuation of equity securities often relies on the (DDM), which estimates the intrinsic value of a as the of expected future discounted at the investor's required . The general form of the DDM is: P=t=1Dt(1+r)tP = \sum_{t=1}^{\infty} \frac{D_t}{(1 + r)^t} where PP is the price, DtD_t is the expected at time tt, and rr is the required . For companies with stable, perpetual dividend growth, the Gordon Growth Model—a simplified variant of the DDM—applies, assuming dividends grow at a constant rate gg indefinitely: P=D1rgP = \frac{D_1}{r - g} where D1D_1 is the expected dividend in the next period, provided r>gr > g. This model, developed by Myron J. Gordon in 1962, facilitates quick assessments for mature firms but assumes unrealistic constant growth for high-volatility equities. Representative examples of equity securities include common shares listed on the New York Stock Exchange (NYSE), such as those of established companies like Apple Inc., which grant voting rights and dividend participation to investors. In private markets, venture capital equity represents high-risk ownership stakes in startups, often in the form of preferred stock with protective provisions, enabling early-stage funding in exchange for potential substantial returns upon exit. Since the 2020s, equity securities have increasingly incorporated environmental, social, and governance (ESG) criteria, with in ESG-integrated equities experiencing rapid growth; for instance, U.S. ESG fund inflows reached $51.1 billion in 2020, more than doubling from $21.4 billion in 2019. This trend reflects a shift toward equities that align financial performance with positive societal and environmental outcomes.

Derivatives

Derivatives are financial instruments whose value is derived from an underlying asset, index, rate, or entity, such as , bonds, commodities, currencies, interest rates, or market indices. Common types include options, which give the holder the right but not the to buy (call) or sell (put) the underlying asset at a specified price within a certain period; futures, which are standardized contracts obligating the buyer to purchase and the seller to sell the underlying at a predetermined price on a date; and swaps, agreements to exchange cash flows or other financial instruments. Derivatives serve purposes like hedging against price fluctuations, speculating on future movements, and gaining leverage without owning the underlying asset. They are traded on exchanges (exchange-traded derivatives) or over-the-counter (OTC) between parties, with exchange-traded ones offering and clearinghouse guarantees to reduce . of derivatives often uses models like the Black-Scholes for options, which calculates the theoretical price based on factors including the underlying price, , time to expiration, , and volatility: C=S0N(d1)KerTN(d2)C = S_0 N(d_1) - K e^{-rT} N(d_2) where CC is the call option price, S0S_0 the current stock price, KK the strike price, rr the risk-free rate, TT time to maturity, σ\sigma volatility, NN the cumulative distribution function of the standard normal, and d1,d2d_1, d_2 intermediate terms. This model assumes constant volatility and no dividends, with extensions for real-world adjustments. Risks include market risk from adverse price movements, leverage amplifying losses, and counterparty risk in OTC trades. Regulatory oversight, such as under the Dodd-Frank Act in the U.S., mandates clearing and reporting for many derivatives to mitigate systemic risks post-2008 crisis.

Hybrid Securities

Hybrid securities are financial instruments that combine elements of both and equity, providing issuers with flexible financing options and investors with a mix of income stability and potential capital appreciation. These securities typically offer features like interest payments alongside equity-like upside potential through conversion or participation rights. Key characteristics of hybrid securities include convertible bonds, which are debt instruments that can be converted into a predetermined number of the issuer's common shares at the holder's option, blending the security of bond interest with equity participation. Preferred stock with conversion features functions similarly, offering priority dividend payments over common stock while allowing conversion to common shares, thus providing downside protection akin to debt. Warrants attached to debt securities grant holders the right to purchase equity at a fixed price, enhancing the debt's attractiveness without immediate dilution. Issuers benefit from hybrid securities through lower rates compared to straight , as the embedded equity option compensates investors for reduced yields. Additionally, these instruments provide advantages, such as deductible payments on the debt component, similar to traditional bonds, while potentially qualifying for equity credit in regulatory capital calculations. Valuation of hybrid securities, particularly convertible bonds, typically decomposes the instrument into a straight bond value plus the value of the embedded conversion option. The conversion option is often priced using adaptations of the Black-Scholes model, which treats it as a on the underlying , accounting for factors like volatility, time to expiration, and . For more complex path-dependent features, such as early conversion or , the binomial model is employed, constructing a lattice of possible price movements to backward-induct the option value. A prominent example of hybrid securities is contingent convertible bonds (CoCos), which automatically convert to equity or absorb losses when a bank's capital falls below a predefined trigger, enhancing financial stability. Introduced under regulations post-2008 , CoCos count toward Additional Tier 1 capital, requiring perpetual structure and loss absorption mechanisms without maturity dates. Sustainable hybrids like green convertible bonds, emerging post-2020, integrate environmental criteria by directing proceeds to eco-friendly projects while retaining conversion features, driven by investor demand for ESG-aligned instruments. These instruments expand the market by offering issuers cost-effective financing with equity upside, appealing to sustainability-focused portfolios.

Classification and Characteristics

In the United States, securities are broadly defined under federal law to encompass a wide range of financial instruments, including notes, stocks, treasury stocks, bonds, debentures, and investment contracts, as outlined in Section 2(a)(1) of the Securities Act of 1933 and Section 3(a)(10) of the Securities Exchange Act of 1934. The Securities and Exchange Commission (SEC) oversees these definitions, emphasizing investor protection through mandatory registration and disclosure requirements for public offerings. A key element of this framework is the "Howey Test," established by the Supreme Court in SEC v. W.J. Howey Co. (1946), which determines whether an arrangement qualifies as an investment contract—a type of security—if it involves the investment of money in a common enterprise with a reasonable expectation of profits derived solely from the efforts of the promoter or third parties. In the , the Financial Services and Markets Act 2000 (FSMA) designates certain investments as regulated activities, specifying shares (article 76 of the Regulated Activities Order) and debentures (article 77) as core examples of securities subject to oversight by the (FCA). The FCA enforces these provisions to ensure market integrity, with post-Brexit adjustments onshoring the EU's Markets in Financial Instruments Directive II (MiFID II) into UK law to maintain continuity in trading and transparency rules for investment firms and venues. This alignment allows the FCA flexibility to adapt rules, such as through temporary transitional powers, while preserving protections against unauthorized activities. Key differences between the U.S. and UK approaches lie in their regulatory priorities: the SEC places heavy emphasis on comprehensive disclosure to inform investors, requiring issuers to file detailed registration statements that include financials, risks, and business descriptions before public offerings. In contrast, the regime, under FCA rules implementing the Market Abuse Regulation (MAR), focuses more on preventing market abuse, prohibiting insider dealing, unlawful disclosure of inside information, and to safeguard overall market confidence. Efforts toward international harmonization of securities regulation began with the (IOSCO), which adopted resolutions in 1989 on cooperation and the international harmonization of securities and derivatives markets, laying the groundwork for global standards. These evolved into IOSCO's Objectives and Principles of Securities Regulation, promoting investor protection, fair markets, and reduction across jurisdictions. In recent developments, the U.S. SEC has applied these frameworks to digital assets; for instance, a 2023 federal court ruling in SEC v. , Inc. held that XRP tokens sold on secondary markets are not securities, though institutional sales were deemed investment contracts under the Howey Test. In August 2025, the SEC and Ripple settled the case, with Ripple agreeing to pay a $125 million , resolving the action while the ruling continues to influence classifications of cryptocurrencies.

By Risk, Return, and Marketability

Securities are often classified by their risk profiles, which encompass market risk, credit risk, and liquidity risk, each influencing the potential for loss or volatility in value. Market risk refers to the sensitivity of a security's returns to broad market movements, quantified in the Capital Asset Pricing Model (CAPM) as E(Ri)=Rf+β(E(Rm)Rf)E(R_i) = R_f + \beta (E(R_m) - R_f), where E(Ri)E(R_i) is the expected return on the investment, RfR_f is the risk-free rate, β\beta measures the asset's volatility relative to the market, and E(Rm)RfE(R_m) - R_f is the market risk premium. This model, developed by William Sharpe, highlights how securities with higher beta values exhibit greater market risk and thus demand higher expected returns to compensate investors. Credit risk, prevalent in debt securities, arises from the possibility that the issuer will default on payments, leading to principal or interest losses; it is assessed through credit ratings, with lower-rated issuers facing higher borrowing costs due to elevated default probabilities. Liquidity risk involves the challenge of converting a security to cash without significant price concessions, particularly acute in less-traded assets where bid-ask spreads widen during stress. Return profiles further delineate securities into fixed, variable, or hybrid categories, reflecting the predictability and variability of income streams. Fixed-return securities, such as or high-grade corporate bonds, provide predetermined payments and principal repayment, offering stability but lower yields compared to riskier alternatives. Variable-return securities, like common stocks, deliver returns through dividends and capital appreciation tied to company performance, exposing investors to greater upside potential alongside volatility. Hybrid securities, including bonds, blend elements of both, starting with fixed payments but allowing conversion to equity for variable gains. The (EMH) posits that security prices incorporate all available information, implying that returns reflect risk-adjusted expectations across weak, semi-strong, and strong forms, where past prices, public disclosures, and even private information are fully priced in, limiting opportunities for abnormal profits. Marketability, or liquidity, distinguishes securities based on ease of trading and price stability in secondary markets. Listed securities on exchanges like the (NYSE) benefit from high liquidity, centralized order matching, and continuous pricing, enabling rapid transactions with minimal impact on market prices. In contrast, over-the-counter (OTC) or private securities often suffer from lower marketability due to decentralized trading, limited transparency, and fewer participants, resulting in wider spreads and potential delays in execution. has amplified these dynamics, enhancing liquidity in normal conditions through high-speed order placement but exacerbating illiquidity during events like the , where automated strategies withdrew liquidity en masse, causing a trillion-dollar market drop in minutes before partial recovery. Illustrative examples underscore these classifications: blue-chip stocks, shares of established firms like those in the Dow Jones Industrial Average, typically exhibit low market and credit risk with stable dividend returns, appealing to conservative investors seeking reliability over speculation. Conversely, junk bonds—high-yield debt rated below investment grade—offer elevated returns to offset substantial credit and default risks, as issuers with weaker financials pay premiums to attract capital despite higher bankruptcy probabilities.

Ownership and Investment Aspects

Types of Holders

Security holders in finance are broadly categorized into individual (retail) investors and institutional investors, each with distinct roles, , and obligations in owning securities. Retail investors are non-professional individuals who invest personal funds directly in securities, often in smaller quantities, and typically have limited influence on due to their scale. In contrast, institutional investors are organizations such as funds, mutual funds, companies, and funds that pool and manage large sums of capital on behalf of others, subjecting them to fiduciary duties to act in the of their clients or beneficiaries. These institutions often wield significant voting power in equity securities, influencing board decisions and shareholder proposals. Another key distinction exists between nominee holders and beneficial owners, which affects how ownership is recorded and exercised. Nominee holders, such as brokerage firms or custodians, hold securities in "" on behalf of the actual , serving as the legal owner for registration purposes while facilitating efficient trading and record-keeping. Beneficial owners, however, retain the true economic and control , including entitlements to dividends and proceeds from sales, even though the securities are not registered in their name. This structure is common in modern markets to streamline transactions, with the nominee acting solely as an intermediary without claiming ownership benefits. Security holders enjoy specific tied to their type, such as entitlement to dividends for equity holders and the ability to exercise voting proxies in corporate matters, though retail investors may delegate these to institutions or brokers. Obligations include responding to margin calls in leveraged positions, where holders must deposit additional funds or securities if account equity falls below maintenance requirements to avoid forced by the broker. Institutional holders face additional regulatory obligations, such as disclosing significant stakes under securities laws to prevent . Examples of retail investor participation include investments through 401(k) retirement plans, where individuals allocate contributions to securities like or bonds for long-term growth, often with employer matching. Institutional investors frequently hold securities via exchange-traded funds (ETFs), which provide diversified exposure to markets and are managed to align with standards for or portfolios. The profile of retail holders has evolved significantly since the 2021 meme stock events, such as the surge, where platforms like Robinhood saw a surge in new users—many first-time investors—driving heightened retail participation in volatile equities. This period marked a maturation of retail trading, with Robinhood's user base expanding beyond speculative frenzies to broader, sustained engagement.

Investment Considerations

Investors evaluate securities based on key factors that align with their financial objectives and constraints. Diversification, a cornerstone of (MPT), reduces overall portfolio risk by combining assets whose returns are not perfectly correlated, as formalized by in his 1952 seminal paper. The theory posits that the portfolio's standard deviation, or risk, is calculated as σp=i=1nwi2σi2+2i=1n1j=i+1nwiwjρijσiσj\sigma_p = \sqrt{\sum_{i=1}^n w_i^2 \sigma_i^2 + 2 \sum_{i=1}^{n-1} \sum_{j=i+1}^n w_i w_j \rho_{ij} \sigma_i \sigma_j}
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