Stock exchangeOrganization that provides services for stock brokers and traders to trade securities The New York Stock Exchange in Lower Manhattan, New York City is the world's largest stock exchange per total market capitalization of its listed companies. A stock exchange, securities exchange, or bourse is an exchange where stockbrokers and traders can buy and sell securities, such as shares of stock, bonds and other financial instruments.
Market liquidityIn business, economics or investment, market liquidity is a market's feature whereby an individual or firm can quickly purchase or sell an asset without causing a drastic change in the asset's price. Liquidity involves the trade-off between the price at which an asset can be sold, and how quickly it can be sold. In a liquid market, the trade-off is mild: one can sell quickly without having to accept a significantly lower price.
London Stock ExchangeThe London Stock Exchange (LSE) is a global stock exchange based in Paternoster Square in the City of London, England. Founded in 1801, it is one of the world's oldest continuously operating stock exchanges. As of mid-2025, the exchange had a total market capitalisation of approximately US$5.9 trillion for all listed instruments.
OptiverOptiver Holding B.V. is a proprietary trading firm and market maker for various exchange-listed financial instruments. Its name derives from the Dutch optieverhandelaar, or "optiontrader". The company is privately owned. Optiver trades listed derivatives, cash equities, exchange-traded funds, bonds, and foreign exchange.
NYSE AmericanNYSE American, formerly known as the American Stock Exchange (AMEX), and more recently as NYSE MKT, is an American stock exchange situated in New York City. AMEX was previously a mutual organization, owned by its members. Until 1953, it was known as the New York Curb Exchange.
New York Stock ExchangeThe New York Stock Exchange (NYSEnicknamed "the Big Board") is an American stock exchange headquartered at the New York Stock Exchange Building in the Financial District of Lower Manhattan in New York City. It is the largest stock exchange in the world by market capitalization, exceeding in January 2026. The NYSE is owned by Intercontinental Exchange, an American holding company that it also lists (ticker symbol ICE).Flow TradersFlow Traders is a proprietary trading firm. A market maker, it provides liquidity in the securities market by using high frequency and quantitative trading strategies. Originally founded in Amsterdam, Flow Traders also has offices in New York, London, Milan, Paris, Cluj, Shanghai, Singapore, Chicago, and Hong Kong.
Big Bang (financial markets)BibliographyElectoral historyHonoursMP for FinchleyPublic Bodies (Admission to Meetings) ActSecretary of State for Education and ScienceCircular 10/70Withdrawal of school milkLeader of the OppositionShadow cabinet1975 leadership election1979 no-confidence vote in Callaghan ministryPrime Minister of the United KingdomPremiershipPoliciesThatcherismdomesticeconomicotherAppointmentsMinisterswets and dries Articles by ministry and term:1979–1983First ministry1979 election"The lady's not for turning""TINA"1979 budget1980 budget1981 budget1982 budget1983 budgetFalklands WarRight to Buy1983–1987Second ministry1983 re-election1984 budget1985 budget1986 budget1987 budgetAnglo-Irish AgreementBig BangBrighton bombingJoint DeclarationMiners' strikeUK rebateWestland affair1987–1990Third ministry1987 re-election1988 budget1989 budget1989 leadership election1990 budget1990 leadership election and resignationBruges speechPoll taxSermon on the MoundPost-premiershipCeremonial funeralLegacyPublicationsThe Downing Street Years (1993)The Path to Power (1995)Statecraft (2003)The phrase Big Bang, used in reference to the sudden deregulation of financial markets, was coined to describe measures, including abolition of fixed commission charges and of the distinction between stockjobbers and stockbrokers on the London Stock Exchange and change from open outcry to screen-based electronic trading, effected by UK Prime Minister Margaret Thatcher in 1986.
StockStocks (also capital stock, or sometimes interchangeably, shares) consist of all the shares by which ownership of a corporation or company is divided. A single share of the stock means fractional ownership of the corporation in proportion to the total number of shares.
Bid–ask spreadThe bid–ask spread (also bid–offer or bid/ask and buy/sell in the case of a market maker) is the difference between the prices quoted (either by a single market maker or in a limit order book) for an immediate sale (ask) and an immediate purchase (bid) for stocks, futures contracts, options, or currency pairs in some auction scenario. The size of the bid–ask spread in a security is one measure of the liquidity of the market and of the size of the transaction cost.
United States Securities and Exchange CommissionThe United States Securities and Exchange Commission (SEC) is a quasi independent agency of the United States federal government, created in the aftermath of the Wall Street crash of 1929.
Volatility (finance)In finance, volatility (usually denoted by "σ") is the degree of variation of a trading price series over time, usually measured by the standard deviation of logarithmic returns. Historic volatility measures a time series of past market prices. Implied volatility looks forward in time, being derived from the market price of a market-traded derivative (in particular, an option).*As an Amazon Associate I earn from qualifying purchases.