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Over-the-counter (OTC) or off-exchange trading is done directly between two parties, without any supervision of an exchange. It is contrasted with exchange trading, which occurs via exchanges. A stock exchange has the benefit of facilitating liquidity, mitigates all credit risk concerning the default of one party in the transaction, provides transparency, and maintains the current market price. In an OTC trade, the price is not necessarily published for the public.
OTC trading, as well as exchange trading, occurs with commodities, financial instruments (including stocks), and derivatives of such. Products traded on the exchange must be well standardized. This means that exchanged deliverables match a narrow range of quantity, quality, and identity which is defined by the exchange and identical to all transactions of that product. This is necessary for there to be transparency in trading. The OTC market does not have this limitation. They may agree on an unusual quantity, for example. In OTC market contracts are bilateral (i.e. contract between only two parties), each party could have credit risk concerns with respect to the other party. OTC derivative market is significant in some asset classes: interest rate, foreign exchange, equities, and commodities.
In 2008 approximately 16 percent of all U.S. stock trades were "off-exchange trading"; by April 2014 that number increased to about forty percent. Although the notional amount outstanding of OTC derivatives in late 2012 had declined 3.3% over the previous year, the volume of cleared transactions at the end of 2012 totalled USD $346.4 trillion. The Bank for International Settlements statistics on OTC derivatives markets showed that notional amounts outstanding totalled $693 trillion at the end of June 2013... [T]he gross market value of OTC derivatives – that is, the cost of replacing all outstanding contracts at current market prices – declined between end-2012 and end-June 2013, from $25 trillion to $20 trillion."
In the United States, over-the-counter trading in stock is carried out by market makers using inter-dealer quotation services such as OTC Link (a service offered by OTC Markets Group) and the OTC Bulletin Board (OTCBB, operated by FINRA). The OTCBB licenses the services of OTC Link for their OTCBB securities. Although exchange-listed stocks can be traded OTC on the third market, it is rarely the case. Usually OTC stocks are not listed nor traded on exchanges, and vice versa. Although stocks quoted on the OTCBB must comply with U.S. Securities and Exchange Commission (SEC) reporting requirements, other OTC stocks have alternative disclosure guidelines (for example, OTCQX stocks through OTC Market Group Inc), and others have no reporting requirements, for example Pink Sheets securities.
Some companies, with Wal-Mart as one of the largest, began trading as OTC stocks and eventually upgraded to a listing on fully regulated market. By 1969 Wal-Mart Stores Inc. was incorporated. In 1972, with stores in five states, including Arkansas, Kansas, Louisiana, Oklahoma and Missouri, Wal-Mart began trading as over-the-counter (OTC) stocks. By 1972 Walmart had earned over USD $1 billion in sales — the fastest company to ever accomplish this. In 1972 Wal-Mart was listed on the New York Stock Exchange (NYSE) under the ticker symbol WMT.
An over-the-counter is a bilateral contract in which two parties (or their brokers or bankers as intermediaries) agree on how a particular trade or agreement is to be settled in the future. It is usually from an investment bank to its clients directly. Forwards and swaps are prime examples of such contracts. It is mostly done online or by telephone. For derivatives, these agreements are usually governed by an International Swaps and Derivatives Association agreement. This segment of the OTC market is occasionally referred to as the "Fourth Market." Critics have labelled the OTC market as the "dark market" because prices are often unpublished and unregulated.
Over-the-counter derivatives are especially important for hedging risk in that they can be used to create a "perfect hedge." With exchange traded contracts, standardization does not allow for as much flexibility to hedge risk because the contract is a one-size-fits-all instrument. With OTC derivatives, though, a firm can tailor the contract specifications to best suit its risk exposure. 
OTC derivatives can lead to significant risks. Especially counterparty risk has gained particular emphasis due to the credit crisis in 2007. Counterparty risk is the risk that a counterparty in a derivatives transaction will default prior to expiration of the trade and will not make the current and future payments required by the contract. There are many ways to limit counterparty risk. One of them focuses on controlling credit exposure with diversification, netting, collateralisation and hedging.
Importance of OTC derivatives in modern banking
OTC derivatives are significant part of the world of global finance. The OTC derivatives markets are large. They grew exponentially from 1980 through 2000. The expansion has been driven by interest rate products, foreign exchange instruments and credit default swaps. The notional outstanding of OTC derivatives markets rose throughout the period and totalled approximately USD $601 trillion at December 31, 2010. Equities trader Josh Galt has presented extensive research on the importance of derivatives in modern banking. 
In their 2000 paper by Schinasi et al. published by the International Monetary Fund in 2001, the authors observed that the increase in OTC derivatives transactions would have been impossible "without the dramatic advances in information and computer technologies" that occurred from 1980 to 2000. During that time, major internationally active financial institutions significantly increased the share of their earnings from derivatives activities. These institutions manage portfolios of derivatives involving tens of thousand of positions and aggregate global turnover over $1 trillion. At that time prior to the financial crisis of 2008, the OTC market was an informal network of bilateral counterparty relationships and dynamic, time-varying credit exposures whose size and distribution tied to important asset markets. International financial institutions increasingly nurtured the ability to profit from OTC derivatives activities and financial markets participants benefitted from them. In 2000 the authors acknowledged that the growth in OTC transactions "in many ways made possible, the modernization of commercial and investment banking and the globalization of finance." However, in September, an IMF team led by Mathieson and Schinasi cautioned that "episodes of turbulence" in the late 1990s "revealed the risks posed to market stability originated in features of OTC derivatives instruments and markets.
The NYMEX has created a clearing mechanism for a slate of commonly traded OTC energy derivatives which allows counterparties of many bilateral OTC transactions to mutually agree to transfer the trade to ClearPort, the exchange's clearing house, thus eliminating credit and performance risk of the initial OTC transaction counterparts.
- McCrank 2014.
- Gregory 2011, p. 7.
- ISDA 2013.
- Bank for International Settlements (BIS) 2013.
- Better Trades 2012.
- Gregory 2011, p. 17.
- Gregory 2011, p. 25.
- International Swaps and Derivatives Association (ISDA) 2010.
- Schinasi et al. 2001, p. 5-7.
- Mathieson & Schinasi 2000, p. 3.
- Monetary and Economic Department (November 2013), "Statistical release OTC derivatives statistics at end June 2013" (PDF), Bank for International Settlements (BIS), retrieved 12 April 2014
- "WMT Overview", Better Trades, 2012, retrieved 12 April 2014
- "Market Review of OTC Derivative Bilateral Collateralization Practices" (PDF), International Swaps and Derivatives Association (ISDA), 1 March 2010, retrieved 12 April 2014
- "OTC Derivatives Market Analysis, Year-End 2010", ISDA (PDF), 26 May 2011
- "OTC Derivatives Market Analysis, Year-End 2012", ISDA (PDF), June 2013
- Gregory, Jon (7 September 2011), Counterparty Credit Risk: The new challenge for global financial markets, John Wiley & Sons, ISBN 978-0-470-68576-1
- Mathieson, Donald J.; Schinasi, Garry J. (September 2000), International Capital Markets: Developments, Prospects, and Key Policy Issues (PDF), World Economic and Financial Surveys
- McCrank, John (6 April 2014), Dark markets may be more harmful than high-frequency trading, New York: Reuters, retrieved 12 April 2014
- Schinasi, Garry J.; Craig, R. Sean; Drees, Burkhard; Kramer, Charles (9 January 2001), Modern Banking and OTC Derivatives Markets: The Transformation of Global Finance and its Implications for Systemic Risk, International Monetary Fund, ISBN 1-55775-999-5, retrieved 12 April 2014
- European Union proposals on derivatives regulation - 2008 onwards
- Understanding Derivatives: Markets and Infrastructure - Chapter 3, Over-the-Counter Derivatives By Richard Heckinger, Ivana Ruffini, and Kirstin Wells (Federal Reserve Bank of Chicago)