Proprietary trading (also known as prop trading) occurs when a trader trades

stock In finance, stock (also capital stock) consists of all the shares by which ownership of a corporation or company is divided.Longman Business English Dictionary: "stock - ''especially AmE'' one of the shares into which ownership of a company ...

bond Bond or bonds may refer to: Common meanings * Bond (finance), a type of debt security * Bail bond, a commercial third-party guarantor of surety bonds in the United States * Chemical bond, the attraction of atoms, ions or molecules to form chemica ...

currencies A currency, "in circulation", from la, currens, -entis, literally meaning "running" or "traversing" is a standardization of money in any form, in use or circulation as a medium of exchange, for example banknotes and coins. A more general def ...

commodities In economics, a commodity is an economic good, usually a resource, that has full or substantial fungibility: that is, the market treats instances of the good as equivalent or nearly so with no regard to who produced them. The price of a comm ...

, their

derivatives The derivative of a function is the rate of change of the function's output relative to its input value. Derivative may also refer to: In mathematics and economics * Brzozowski derivative in the theory of formal languages * Formal derivative, an ...

, or other financial instruments with the firm's own money (instead of using depositors' money) in order to make a profit for itself. Proprietary trading can create potential conflicts of interest such as

insider trading Insider trading is the trading of a public company's stock or other securities (such as bonds or stock options) based on material, nonpublic information about the company. In various countries, some kinds of trading based on insider information ...

and

front running Front running, also known as tailgating, is the prohibited practice of entering into an equity ( stock) trade, option, futures contract, derivative, or security-based swap to capitalize on advance, nonpublic knowledge of a large ("block") pend ...

. Proprietary traders may use a variety of strategies such as

index arbitrage Index arbitrage is a subset of statistical arbitrage focusing on index components. An index (such as S&P 500) is made up of several components (in the case of the S&P 500, 500 large US stocks picked by S&P to represent the US market), and the va ...

statistical arbitrage In finance, statistical arbitrage (often abbreviated as ''Stat Arb'' or ''StatArb'') is a class of short-term financial trading strategies that employ mean reversion models involving broadly diversified portfolios of securities (hundreds to thousan ...

merger arbitrage Risk arbitrage, also known as merger arbitrage, is an investment strategy that speculates on the successful completion of mergers and acquisitions. An investor that employs this strategy is known as an arbitrageur. Risk arbitrage is a type of even ...

fundamental analysis Fundamental analysis, in accounting and finance, is the analysis of a business's financial statements (usually to analyze the business's assets, liabilities, and earnings); health; and competitors and markets. It also considers the overall state ...

volatility arbitrage In finance, volatility arbitrage (or vol arb) is a term for financial arbitrage techniques directly dependent and based on volatility. A common type of vol arb is type of statistical arbitrage that is implemented by trading a delta neutral port ...

, or

global macro Global macro is an investment strategy based on the interpretation and prediction of large-scale events related to national economies, history, and international relations. The strategy typically employs forecasts and analysis of interest rate trend ...

trading, much like a

hedge fund A hedge fund is a pooled investment fund that trades in relatively liquid assets and is able to make extensive use of more complex trading, portfolio-construction, and risk management techniques in an attempt to improve performance, such as sho ...

. Many reporters and analysts believe that large banks purposely leave ambiguous the proportion of proprietary versus non-proprietary trading, because it is felt that proprietary trading is riskier and results in more volatile profits.

Arbitrage

One of the main strategies of trading, traditionally associated with banks, is

arbitrage In economics and finance, arbitrage (, ) is the practice of taking advantage of a difference in prices in two or more markets; striking a combination of matching deals to capitalise on the difference, the profit being the difference between the ...

. In the most basic sense, arbitrage is defined as taking advantage of a price discrepancy through the purchase or sale of certain combinations of securities to lock in a market-neutral profit. The trade will remain subject to various non-market risks, such as settlement risk and other operational risks. Investment banks, which are often active in many markets around the world, constantly watch for arbitrage opportunities. One of the more-notable areas of arbitrage, called risk arbitrage or merger arbitrage, evolved in the 1980s. When a company plans to buy another company, often the share price of the buyer falls (because the buyer will have to pay money to buy the other company) and the share price of the purchased company rises (because the buyer usually buys those shares at a price higher than the current price). When an investment bank believes a buyout is imminent, it often sells short the shares of the buyer (betting that the price will go down) and buys the shares of the company being acquired (betting the price will go up).

Conflicts of interest

There are a number of ways in which proprietary trading can create

conflicts of interest A conflict of interest (COI) is a situation in which a person or organization is involved in multiple interests, financial or otherwise, and serving one interest could involve working against another. Typically, this relates to situations i ...

between a bank's interests and those of its customers. As investment banks are key figures in mergers and acquisitions, it is possible (though prohibited) for traders to use

inside information Insider trading is the trading of a public company's stock or other securities (such as bonds or stock options) based on material, nonpublic information about the company. In various countries, some kinds of trading based on insider information ...

to engage in merger arbitrage. Investment banks are required to have a

Chinese wall A Chinese wall or ethical wall is an information barrier protocol within an organization designed to prevent exchange of information or communication that could lead to conflicts of interest. For example, a Chinese wall may be established to sepa ...

separating their trading and investment banking divisions; however, in recent years, especially since the

Enron scandal The Enron scandal was an accounting scandal involving Enron Corporation, an American energy company based in Houston, Texas. Upon being publicized in October 2001, the company declared bankruptcy and its accounting firm, Arthur Andersen then on ...

, these have come under closer scrutiny. One example of an alleged conflict of interest can be found in charges brought by the

Australian Securities & Investments Commission The Australian Securities and Investments Commission (ASIC) is an independent commission of the Australian Government tasked as the national corporate regulator. ASIC's role is to regulate company and financial services and enforce laws to pro ...

against

Citigroup Citigroup Inc. or Citi (Style (visual arts), stylized as citi) is an American multinational investment banking, investment bank and financial services corporation headquartered in New York City. The company was formed by the merger of banking ...

in 2007. Another source of conflicts of interest is potential

, in which case the buy-side clients suffer from significantly higher trading costs. Front running per se is illegal, but there are circumstances under which a broker that operates a proprietary trading desk gains advantage over its clients based on inferences from

order book An order book is the list of orders (manual or electronic) that a trading venue (in particular stock exchanges) uses to record the interest of buyers and sellers in a particular financial instrument. A matching engine uses the book to determin ...

data.

Famous trading banks and traders

Famous proprietary traders have included

Ivan Boesky Ivan Frederick Boesky (born March 6, 1937) is a former American stock trader who became infamous for his prominent role in an insider trading scandal that occurred in the United States during the mid-1980s. He was charged and pled guilty to insi ...

Steven A. Cohen Steven A. Cohen (born June 11, 1956) is an American hedge fund manager and owner of the New York Mets of Major League Baseball since September 14, 2020, owning roughly 97.2% of the team. He is the founder of hedge fund Point72 Asset Manageme ...

, John Meriwether,

Daniel Och Daniel Och (born 1961) is an American billionaire hedge fund manager, and philanthropist. He is the founder, chairman and former CEO of Och-Ziff Capital Management, a global hedge fund and alternative asset management firm. According to ' ...

, and

Boaz Weinstein Boaz Weinstein (born 1973) is an American hedge fund manager and founder of Saba Capital Management. He rose to prominence at Deutsche Bank in the early and mid 2000s with his credit default swap and capital structure arbitrage trading strategi ...

. Some of the investment banks most historically associated with trading were

Salomon Brothers Salomon Brothers, Inc., was an American multinational bulge bracket investment bank headquartered in New York. It was one of the five largest investment banking enterprises in the United States and the most profitable firm on Wall Street duri ...

and

Drexel Burnham Lambert Drexel Burnham Lambert was an American multinational investment bank that was forced into bankruptcy in 1990 due to its involvement in illegal activities in the junk bond market, driven by senior executive Michael Milken. At its height, it was a ...

. Trader

Nick Leeson Nicholas William Leeson (born 25 February 1967) is an English former derivatives trader whose fraudulent, unauthorized and speculative trades resulted in the 1995 collapse of Barings Bank, the United Kingdom's oldest merchant bank. Leeson w ...

took down

Barings Bank Barings Bank was a British merchant bank based in London, and one of England's List of oldest banks in continuous operation, oldest merchant banks after Berenberg Bank, Barings' close collaborator and German representative. It was founded in 1762 ...

with unauthorized proprietary positions. UBS trader

Kweku Adoboli Kweku Adoboli (born 21 May 1980) is a Ghanaian investment manager and former stock trader. He was convicted of illegally trading away US$2 billion (£1.3 billion STG) as a trader for Swiss investment bank UBS. While at the bank he pr ...

lost $2.2 billion of the bank's money and was convicted for his actions.

Armin S Armin (Armyn) is a given name or surname, and is: * An ancient Indo-European name: ** a German/Dutch given name, *** a modern form of the name Arminius (18/17 BC–AD 21), a German prince who defeated a Roman army in the Battle of the Teutoburg F ...

, a German private trader, sued

BNP Paribas BNP Paribas is a French international banking group, founded in 2000 from the merger between Banque Nationale de Paris (BNP, "National Bank of Paris") and Paribas, formerly known as the Banque de Paris et des Pays-Bas. The full name of the grou ...

for 152m EUR because they sold to him

structured product A structured product, also known as a market-linked investment, is a pre-packaged structured finance investment strategy based on a single Security (finance), security, a basket of securities, Option (finance), options, Index (economics), indices, ...

s for 108 EUR each which were worth 54 00 EUR.

References

{{Authority control Financial markets

Arbitrage

Conflicts of interest

Famous trading banks and traders

See also

References