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In finance, a reverse stock split or reverse split is a process by which shares of corporate stock are effectively merged to form a smaller number of proportionally more valuable shares.

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 event-driven investing in that it attempts to exploit pricing inefficiencies caused by a corporate event.

The risk-free rate of return, usually shortened to the risk-free rate, is the rate of return of a hypothetical investment with scheduled payments over a fixed period of time that is assumed to meet all payment obligations.

S&P 500 futures are financial futures which allow an investor to hedge with or speculate on the future value of various components of the S&P 500 Index market index. S&P 500 futures contracts were first introduced by the Chicago Mercantile Exchange in 1982. The CME added the e-mini option in 1997. The bundle of stocks in the S&P 500 is, per the name, composed of stocks of 500 large compa

The secondary market, also called the aftermarket, is the financial market in which previously issued financial instruments such as shares, bonds, options, and futures are bought and sold. The initial sale of the security by the issuer to a purchaser, who pays proceeds to the issuer, is the primary market. All sales after the initial sale of the security are sales in the secondary market

Sector rotation is a theory of stock market trading patterns.

Securities market participants in the United States include corporations and governments issuing securities, persons and corporations buying and selling a security, the broker-dealers and exchanges which facilitate such trading, banks which safe keep assets, and regulators who monitor the markets' activities. Investors buy and sell through broker-dealers and have their assets retained b

Securitization is the financial practice of pooling contractual debt obligations (such as residential mortgages, commercial mortgages, auto loans, or credit card debt) and selling their associated cash flows to investors. The financial instruments sold in such transactions are known as securities, types of which include bonds, pass-through securities, and collateralized debt obligations

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

Sell in May and go away is an investment strategy for stocks based on a theory (sometimes known as the Halloween indicator) that the period from November to April inclusive has significantly stronger stock market growth on average than the other months. In such strategies, stock holdings are sold or minimized at about the start of May and the proceeds held in cash (e.g. a money market fu

Share repurchase, also known as share buyback or stock buyback, is the reacquisition by a company of its own shares. It is an alternative way of returning money to shareholders than dividends. After a repurchase event, the company's stock price is now proportionally higher because of the smaller number of shares outstanding. Repurchases allow stockholders to potentially reduce taxes, by

In finance, being short in an asset means investing in such a way that the investor will profit if the market value of the asset falls. This is the opposite of the more common long position, where the investor will profit if the market value of the asset rises. An investor that sells an asset short is, as to that asset, a short seller.

In finance and the stock market, slippage is the difference between the execution price expected by the trader (usually the one indicated by the trading software) and the one at which the transaction actually happens. Market impact, liquidity, and frictional costs may contribute to slippage.

Social trading is a form of investing that allows investors to observe the trading behavior of their peers and expert traders. The primary objective is to follow their investment strategies using copy trading or mirror trading. Social trading requires little or no knowledge about financial markets.

In finance, speculation is the purchase of an asset (a commodity, goods, or real estate) with the hope that that asset will become more valuable in a brief amount of time.

Spoofing is a disruptive algorithmic trading activity employed by traders to outpace other market participants and to manipulate markets. Spoofers feign interest in trading futures, stocks, and other products in financial markets creating an illusion of the demand and supply of the traded asset. In an order driven market, spoofers post a relatively large number of limit orders on one sid

A squeeze-out or squeezeout, sometimes synonymous with freeze-out, is the compulsory sale of the shares of minority shareholders of a joint-stock company for which they receive a fair cash compensation.

In finance, statistical arbitrage (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 thousands) held for short periods of time (generally seconds to days). These strategies are supported by substantial mathematical, computational, and trading platforms.

Stocks (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. This typically entitles the shareholder (stockholder) to that fraction of the company's earnings, proceeds from liquidat

Stock dilution, also known as equity dilution, is the decrease in existing shareholders' ownership percentage of a company as a result of the company issuing new equity. New equity increases the total shares outstanding which has a dilutive effect on the ownership percentage of existing shareholders. This increase in the number of shares outstanding can result from a primary market off

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. Stock exchanges may also provide facilities for the issue and redemption of such securities and instruments and capital events including the payment of income and dividends. Securities traded on a stock

In finance, a stock market index or stock index is an index that measures the performance of a stock market, or of a subset of a stock market. It helps investors compare current stock price levels with past prices to calculate market performance.

A stock split or stock divide increases the number of shares in a company. For example, after a 2-for-1 split, each investor will own double the number of shares, and each share will be worth half as much. A stock split causes a decrease of market price of individual shares, but does not change the total market capitalization of the company: stock dilution does not occur.

Style investing is an investment approach in which securities are grouped into categories, and portfolio allocation is based on selection among "styles" rather than among individual securities.

Swing trading is a speculative trading strategy in financial markets where a tradable asset is held for one or more days in an effort to profit from price changes or swings. A swing trading position is typically held longer than a day trading position, but shorter than buy-and-hold investment strategies that can be held for months or years. Profits can be sought by either buying an asse

Private equity funds and hedge funds are private investment vehicles used to pool investment capital, usually for a small group of large institutional or wealthy individual investors. They are subject to favorable regulatory treatment in most jurisdictions from which they are managed, which allows them to engage in financial activities that are off-limits for more regulated companies.

In finance, technical analysis is an analysis methodology for analysing and forecasting the direction of prices through the study of past market data, primarily price and volume. As a type of active management, it stands in contradiction to much of modern portfolio theory. The efficacy of technical analysis is disputed by the efficient-market hypothesis, which states that stock market pr

Tracking stock (also known as letter stock and targeted stock) is a specialized equity offering issued by a company that is based on the operations of a defined business within the larger organization (such as, for instance, a wholly owned subsidiary of a diversified firm). Therefore, the tracking stock will be traded at a price related to the operations of the specific division of the c

In finance, a trade is an exchange of a security such as stocks, bonds, commodities, currencies, derivatives or any valuable financial instrument for "cash". Such a financial transaction is usually done by participants of an exchange such as a stock exchange, commodity exchange or futures exchange with a short-dated promise to pay in the currency of the country where the 'exchange' is lo

Trend following or trend trading is a trading strategy according to which one should buy an asset when its price trend goes up, and sell when its trend goes down, expecting price movements to continue.

Triangular arbitrage (also referred to as cross currency arbitrage or three-point arbitrage) is the act of exploiting an arbitrage opportunity resulting from a pricing discrepancy among three different currencies in the foreign exchange market. A triangular arbitrage strategy involves three trades, exchanging the initial currency for a second, the second currency for a third, and the thi

The uptick rule is a trading restriction that states that short selling a stock is allowed only on an uptick. For the rule to be satisfied, the short must be either at a price above the last traded price of the security, or at the last traded price when the most recent movement between traded prices was upward (i.e. the security has traded below the last-traded price more recently than a

Value investing is an investment paradigm that involves buying securities that appear underpriced by some form of fundamental analysis. Modern value investing derives from the investment philosophy taught by Benjamin Graham and David Dodd at Columbia Business School starting in 1928 and subsequently developed in their 1934 text Security Analysis.

In finance, volatility arbitrage (vol arb) is a term for financial arbitrage techniques directly dependent and based on volatility.

Voting interest (or voting power) in business and accounting means the total number, or percent, of votes entitled to be cast on the issue at the time the determination of voting power is made, excluding a vote which is contingent upon the happening of a condition or event which has not occurred at the time.

A vulture fund is a hedge fund or private-equity fund that invests in debt considered to be very weak or in default, known as distressed debt. Investors in the fund profit by buying debt at a discounted price on a secondary market and then using numerous methods to sell the debt for more than the purchasing price. Debtors include companies, countries, and individuals.

XTX Markets Limited is a British algorithmic trading company based in London. It was founded in January 2015 by Alexander Gerko, who is currently co-CEO alongside Hans Buehler. The company employs around 300 people globally (as of 2026) and uses state-of-the-art machine learning technology to produce price forecasts for over 50,000 financial instruments across equities, fixed income, cur

In finance, the yield on a security is a measure of the ex-ante return to a holder of the security. It is one component of return on an investment, the other component being the change in the market price of the security. It is a measure applied to fixed income securities, common stocks, preferred stocks, convertible stocks and bonds, annuities and real estate investments.