Glossary · 151 terms
Stock Market Basics
All stock market basics terms in the EquitiesAmerica.com glossary — plain-English definitions for American investors.
ADR (American Depositary Receipt)(American Depositary Receipt)
An American Depositary Receipt (ADR) is a negotiable certificate issued by a U.S. bank representing shares of a foreign company, allowing Americans to invest in foreign stocks through U.S. exchanges without dealing in foreign currencies directly.
Advance-Decline Line(A-D line)
The advance-decline line is a cumulative technical indicator that tracks the net difference between advancing and declining stocks on an exchange each day, used to measure the breadth and momentum of overall market participation.
After-Hours Trading(extended-hours trading)
After-hours trading refers to the buying and selling of securities on U.S. markets outside of regular stock exchange trading hours (9:30 a.m. to 4:00 p.m. Eastern Time), encompassing both pre-market sessions (typically 4:00 a.m. to 9:30 a.m. ET) and after-market sessions (4:00 p.m. to 8:00 p.m. ET) via electronic communication networks (ECNs). It offers extended access but comes with reduced liquidity and wider bid-ask spreads.
Alternative Trading System(ATS)
An alternative trading system (ATS) is an SEC-regulated trading venue that matches buyers and sellers of securities but is not registered as a national securities exchange, operating under a lighter regulatory framework that allows greater flexibility in access policies, anonymity, and trading protocols than traditional exchanges.
Archegos Capital Collapse
The Archegos Capital collapse of March 2021 was a forced liquidation event in which the implosion of a family office's highly leveraged positions in a concentrated set of stocks caused over $10 billion in losses at major global banks and triggered sharp declines in the affected stocks.
Asian Financial Crisis (1997)
The Asian Financial Crisis of 1997 to 1998 was a currency and financial market collapse that began in Thailand and spread rapidly across Southeast and East Asia, wiping out years of economic gains and prompting emergency IMF bailouts.
Authorized Shares
Authorized shares are the maximum number of shares a corporation is legally permitted to issue, as specified in its articles of incorporation, setting an upper limit on how much equity it can create.
Bag Holder
A bag holder is a colloquial term for an investor who continues to hold a stock that has declined significantly in value, often unwilling or unable to sell at a loss while hoping for a recovery that may never materialize.
Bear Market(bearish market)
A bear market is a sustained decline in stock prices of 20% or more from recent highs in a broad index such as the S&P 500, typically accompanied by widespread pessimism, declining economic activity, and reduced investor risk appetite. Bear markets are the counterpart to bull markets in the cycle of U.S. equity markets.
Behavioral Finance
Behavioral Finance is the field of study that integrates psychological research on cognitive biases and emotional decision-making into the analysis of financial markets and individual investor behavior.
Beneficial Owner vs Registered Owner(beneficial shareholder)
A Beneficial Owner is the investor who has the actual economic interest in a security — receiving dividends, bearing price risk, and having the right to direct its sale — while the Registered Owner is the entity whose name appears on the transfer agent's official records as the legal shareholder, typically a broker-dealer or DTC nominee in modern markets.
Bid-Ask Spread(spread)
The bid-ask spread is the difference between the highest price a buyer is willing to pay for a security (the bid) and the lowest price a seller is willing to accept (the ask or offer), representing the implicit cost of transacting in a security and the primary source of compensation for market makers. A narrower spread indicates greater liquidity.
Black Monday (1987)
Black Monday refers to October 19, 1987, when the Dow Jones Industrial Average fell 22.6% in a single trading session — the largest one-day percentage decline in US stock market history.
Blue Chip Stock(blue-chip)
A blue chip stock is a share in a large, nationally recognized, financially stable, and well-established corporation with a long track record of consistent performance and often a history of paying dividends through various economic cycles. The term originates from poker, where blue chips traditionally carry the highest value.
Book Value Per Share(BVPS)
Book value per share is the per-share amount of a company's net assets — total equity divided by shares outstanding — representing the accounting value of each share if the company were liquidated today.
Bretton Woods System
The Bretton Woods System was the international monetary framework established in 1944 in which member countries pegged their currencies to the US dollar, which was in turn convertible to gold at $35 per ounce, creating a fixed exchange rate system that governed global finance until 1971.
Buffer Zone (Index)(index buffer)
A buffer zone in index construction is a range around a constituent eligibility threshold that a security must decisively breach before being added or removed from an index, designed to reduce unnecessary turnover and trading costs by preventing securities that oscillate near a boundary from repeatedly entering and exiting the index.
Bull Market(bullish market)
A bull market is a sustained period during which stock prices are rising or are expected to rise, commonly defined as a gain of 20% or more from a recent low in a broad market index such as the S&P 500. Bull markets are typically accompanied by strong economic growth, low unemployment, and high investor confidence.
Capitulation
Capitulation is the point in a market decline when widespread panic selling reaches its peak, with investors abandoning positions regardless of price to exit equities, typically occurring near or at market bottoms before a recovery begins.
Capped Index(capped market cap index)
A capped index imposes a maximum weight limit on individual constituents or groups of constituents — such as a sector or country — within an otherwise market-cap weighted or free-float weighted benchmark, preventing any single stock or group from dominating the index and forcing periodic mechanical rebalancing when weights breach the cap.
Circuit Breaker(trading halt)
A circuit breaker is a regulatory mechanism that temporarily halts trading on U.S. stock exchanges when prices decline sharply within a single session, designed to prevent panic-driven market freefall and allow time for information to be absorbed and rational pricing to reassert itself. Market-wide circuit breakers in the U.S. are triggered based on percentage declines in the S&P 500.
Common Stock(ordinary shares)
Common stock is the standard class of equity ownership in a corporation, granting shareholders voting rights and a residual claim on earnings and assets after all other obligations are satisfied.
Conference Board Leading Indicators(LEI)
The Conference Board Leading Economic Index (LEI) is a composite indicator published monthly by The Conference Board that aggregates ten economic data series designed to signal turning points in the US business cycle before they are visible in official GDP and employment data.
Continuous Listing Standards(continued listing requirements)
Continuous listing standards are the ongoing financial, governance, and distribution requirements that a company must maintain after its initial listing approval to remain traded on a national securities exchange, with failure to meet these standards triggering a notification process, remediation period, and ultimately delisting if deficiencies are not corrected.
Contrarian Investing
Contrarian Investing is the strategy of deliberately taking positions opposite to prevailing market sentiment — buying assets that are widely out of favor and selling or avoiding assets that are widely popular — based on the belief that crowds systematically overprice optimism and underprice pessimism.
COVID-19 Market Crash (2020)
The COVID-19 Market Crash of February and March 2020 was a sudden and severe global equity sell-off triggered by the spread of the SARS-CoV-2 pandemic, representing the fastest descent from an all-time high to a bear market in recorded US stock market history.
Cyclical Stock
A cyclical stock is a share in a company whose business performance and stock price are closely tied to the expansion and contraction phases of the broader economic cycle, typically rising sharply during growth periods and falling during recessions.
Dead Cat Bounce
A dead cat bounce is a temporary and deceptive recovery in the price of a declining stock or market index that occurs after a sharp drop, appearing to signal a reversal but ultimately failing and resuming the downward trend.
Defensive Stock(non-cyclical stock)
A defensive stock is a share in a company that provides relatively stable revenues and earnings regardless of the economic cycle, typically in industries supplying essential goods or services that consumers purchase in both good and bad times.
Designated Market Maker(DMM)
A Designated Market Maker (DMM) is a registered market maker assigned exclusive responsibility by the NYSE for maintaining a fair and orderly market in a specific set of listed securities, combining obligations to provide continuous two-sided quotes and facilitate price discovery with privileges including access to unique order flow information and discretionary participation rights.
Dilution
Dilution occurs when a company issues new shares, reducing existing shareholders' percentage ownership and potentially decreasing earnings per share and other per-share metrics.
Direct Listing(DPO)
A direct listing is a method for a private company to go public by allowing existing shareholders to sell their shares directly on a stock exchange without the company issuing new shares or hiring underwriters.
Dividend(cash dividend)
A dividend is a distribution of a portion of a company's earnings to its shareholders, typically paid in cash on a per-share basis at regular intervals (quarterly in most U.S. companies) as authorized by the company's board of directors. Dividends represent one of the two primary ways equity investors receive returns, the other being capital appreciation.
Dividend-Weighted Index(dividend index weighting)
A dividend-weighted index assigns constituent weights based on each company's total dividend payments — either dollar dividends paid, dividend yield, or forecasted dividends — rather than market capitalization or share price, tilting the portfolio toward income-generating companies and introducing a systematic value bias.
Dot-Com Bubble
The Dot-Com Bubble was a speculative mania in internet-related stocks that inflated through the late 1990s and burst between 2000 and 2002, wiping out trillions of dollars in market value.
Dow Jones Industrial Average(DJIA)
The Dow Jones Industrial Average (DJIA) is a price-weighted index tracking 30 large, blue-chip U.S. companies listed on the NYSE and NASDAQ, serving as one of the oldest and most widely recognized indicators of U.S. stock market performance. It was created by Charles Dow and Edward Jones in 1896.
Earnings Season(reporting season)
Earnings season is the roughly four-week period each quarter when the majority of publicly traded U.S. companies release their earnings reports, triggering heightened market activity and price volatility.
Efficient Market Hypothesis (Weak/Semi-Strong/Strong)(EMH)
The Efficient Market Hypothesis (EMH) holds that stock prices fully reflect all available information, making it impossible to consistently earn excess returns through analysis or trading — with three forms defined by what 'all available information' means.
Electronic Communication Network(ECN)
An electronic communication network (ECN) is a type of alternative trading system that automatically matches buy and sell orders entered by market participants at specified prices, displaying quotes in the public market and providing direct access to the order book for subscribers, typically broker-dealers and institutional investors.
Enron Scandal
The Enron Scandal was a corporate accounting fraud discovered in 2001 in which Enron Corporation, once the seventh-largest company in the United States, used complex off-balance-sheet vehicles to conceal billions in debt and fabricate profits, leading to the largest bankruptcy in US history at the time.
Equal-Weighted Index(equal-weight index)
An equal-weighted index assigns an identical percentage weight to every constituent stock regardless of market capitalization, share price, or any other size measure, creating a portfolio that treats a micro-cap company the same as a mega-cap company and that must be periodically rebalanced to restore equal weights as prices diverge.
Equity(stockholders' equity)
Equity refers to the ownership interest in a company represented by stock, calculated as the company's total assets minus its total liabilities. In corporate finance and investing, equity is a fundamental concept that underpins how ownership, value, and returns are measured.
Ex-Dividend Date(ex-date)
The ex-dividend date is the cutoff date established by a stock exchange on which a buyer must own shares to be entitled to the next declared dividend; buyers on or after this date do not receive the upcoming dividend.
Exempt Market Maker(market maker Reg SHO exemption)
An exempt market maker is a broker-dealer that qualifies for certain regulatory exemptions — most notably from short-sale locate and marking requirements under Regulation SHO — specifically because it is engaged in bona fide market-making activity in a security, standing ready to buy and sell at displayed prices on a continuous basis.
Fear and Greed Index(CNN Fear and Greed Index)
The Fear and Greed Index is a composite sentiment indicator developed by CNN Business that combines seven market signals to produce a score between 0 and 100, with low scores reflecting extreme fear and high scores reflecting extreme greed in U.S. equity markets.
Flash Crash (2010)
The Flash Crash of May 6, 2010 was a market event in which the Dow Jones Industrial Average plunged nearly 1,000 points in minutes before recovering almost as rapidly, exposing deep vulnerabilities in the structure of modern electronic markets.
Float(public float)
Float (or public float) refers to the number of a company's shares that are freely available for trading by the general public, excluding shares held by company insiders, major institutional shareholders subject to lock-up agreements, and shares held in employee stock option plans. Float is a more practical measure of trading liquidity than total shares outstanding.
FOMO (Fear of Missing Out)(fear of missing out)
FOMO, or fear of missing out, describes the anxiety-driven impulse that pushes investors to chase rapidly rising assets — stocks, sectors, or markets — out of concern that they will be left behind while others profit, often leading to poor entry timing and elevated risk-taking.
Fractional Share
A Fractional Share is a portion of a single share of stock or ETF — less than one full share — allowing investors to purchase exposure to high-priced securities with small dollar amounts and to fully deploy capital without leaving cash idle due to share price constraints.
Free-Float Methodology(float-adjusted market cap)
Free-float methodology is an index construction approach that calculates market capitalization using only the shares actually available for public trading — excluding closely held blocks owned by governments, founders, controlling families, or strategic corporate investors — so that index weights reflect the portion of a company that the broader market can realistically buy and sell.
FTX Collapse
The FTX Collapse of November 2022 was the sudden implosion of FTX, once the world's second-largest cryptocurrency exchange, after revelations that customer funds had been commingled with and used by its affiliated trading firm Alameda Research, resulting in bankruptcy and the arrest of its founder Sam Bankman-Fried.
GameStop Short Squeeze (2021)
The GameStop Short Squeeze of January 2021 was a market event in which coordinated retail buying, organized largely through the Reddit forum WallStreetBets, drove GameStop's stock price from under $20 to nearly $500 in weeks, inflicting billions in losses on institutional short sellers.
Global Financial Crisis (2008)
The Global Financial Crisis of 2008 was the most severe financial collapse since the Great Depression, triggered by the implosion of the US subprime mortgage market and the subsequent failure of interconnected financial institutions worldwide.
Great Depression (Stock Market)
The Great Depression was the most severe economic and financial catastrophe of the twentieth century, during which the US stock market fell approximately 89% from its 1929 peak to its 1932 trough, unemployment reached 25%, and the global economy contracted for nearly a decade.
Growth Stock(growth equity)
A growth stock is a share in a company expected to increase its revenues and earnings at an above-average rate compared to the broader market, typically trading at a premium valuation in anticipation of future expansion.
Income Stock(dividend stock)
An income stock is a share that pays regular and relatively high dividends, making it attractive to investors seeking a steady stream of cash income rather than primarily relying on capital appreciation.
Index Committee(index governance body)
An index committee is a governance body assembled by an index provider to oversee constituent selection, methodology interpretation, and discretionary decisions related to a specific index or family of indices, applying the published rules while exercising judgment in situations the rules do not explicitly address.
Index Rebalancing Effect(index inclusion effect)
The Index Rebalancing Effect refers to the predictable buying and selling pressure generated when a stock is added to or removed from a major equity index, or when an index undergoes periodic reconstitution, forcing passive funds tracking the index to mechanically adjust their holdings.
Industry Group(GICS industry group)
An industry group is the second tier of the GICS classification hierarchy, sitting between a broad sector and a more specific industry, and represents a cluster of businesses that share closely related economic characteristics, supply chains, or end-market exposures even if their specific products or services differ.
Institutional Investor(institutional money)
An Institutional Investor is an organization — such as a pension fund, mutual fund, insurance company, endowment, or hedge fund — that pools large amounts of capital and deploys it in financial markets on behalf of its beneficiaries or shareholders, accounting for the majority of daily trading volume on US exchanges.
IPO(Initial Public Offering)
An Initial Public Offering (IPO) is the process by which a private company offers its shares to the general public on a stock exchange for the first time, transitioning from private to public ownership and allowing it to raise capital from public investors. In the United States, IPOs are regulated by the SEC under the Securities Act of 1933.
January Effect(January seasonal effect)
The January Effect is a historically observed tendency for equity markets — particularly small-cap stocks — to generate above-average returns in January, a pattern historically attributed to tax-loss harvesting selling in December followed by reinvestment early in the new year.
January Indicator(January Effect)
The January Indicator encompasses two related stock market seasonality theories — the January Effect and the January Barometer — the first holding that small-cap stocks tend to outperform in January due to tax-loss selling reversals, and the second holding that January's stock market performance predicts the direction of the full-year market with the adage 'as January goes, so goes the year.'
Large-Cap Stock(large cap)
A large-cap stock is a publicly traded company with a market capitalization typically above $10 billion, representing established, well-known corporations that tend to offer greater stability, liquidity, and institutional coverage than smaller peers.
Limit Order(limit buy order)
A limit order is an instruction to execute a securities transaction at a specified price or better — a maximum price for a purchase order, or a minimum price for a disposition order — providing price certainty at the cost of execution certainty. Limit orders are a fundamental order type at all U.S. brokerages and exchanges.
Listing Requirements (NASDAQ)(NASDAQ listing standards)
NASDAQ listing requirements are the financial, governance, and distribution standards a company must meet to list its securities on the NASDAQ Stock Market, which operates three tiers — the NASDAQ Global Select Market, NASDAQ Global Market, and NASDAQ Capital Market — each with distinct thresholds calibrated to different company sizes and maturity levels.
Listing Requirements (NYSE)(NYSE listing standards)
NYSE listing requirements are the minimum quantitative and qualitative standards that a company must satisfy to have its securities listed and traded on the New York Stock Exchange, covering financial health, corporate governance, shareholder equity, share distribution, and ongoing disclosure obligations.
LTCM Collapse (1998)
The collapse of Long-Term Capital Management (LTCM) in 1998 was a near-systemic financial crisis in which a hedge fund managed by Nobel Prize-winning economists imploded after taking on enormous leveraged positions that unraveled when global markets moved in ways their models had assigned near-zero probability.
Madoff Ponzi Scheme
The Madoff Ponzi Scheme was a decades-long investment fraud operated by Bernard Madoff that fabricated consistent returns for clients while simply using new investor deposits to pay older ones, resulting in estimated losses of $65 billion and the largest Ponzi scheme ever prosecuted.
Market Breadth
Market breadth is a technical measure of the overall participation of individual stocks in a market move, assessing whether an advance or decline in a major index is supported by broad participation across many stocks or driven by only a narrow group of large-cap leaders.
Market Capitalization(market cap)
Market capitalization (market cap) is the total market value of a publicly traded company's outstanding shares, calculated by multiplying the current share price by the total number of shares outstanding. It is the most widely used measure of a company's size in financial markets.
Market Correction(pullback)
A market correction is a decline of 10 percent or more from a recent peak in a major stock index such as the S&P 500, typically representing a temporary pullback within a longer-term uptrend.
Market Maker(designated market maker)
A market maker is a broker-dealer or firm that continuously quotes both a bid price and an ask price for a security, committing to buy and sell at those prices to provide liquidity to other market participants.
Market Order(market buy order)
A market order is an instruction to purchase or liquidate a security immediately at the best available current price in the market, prioritizing speed of execution over price certainty. Market orders are the most basic order type offered by U.S. brokerages and are guaranteed to execute (assuming sufficient liquidity) but not at a specific price.
Market Quality Metrics(market microstructure metrics)
Market quality metrics are quantitative measures used by exchanges, regulators, investors, and academic researchers to evaluate how effectively a securities market facilitates efficient, low-cost trading — encompassing bid-ask spreads, market depth, price impact, trade-through rates, volatility, and execution speed as the primary dimensions of market performance.
Market Sentiment
Market sentiment is the overall attitude and emotional disposition of participants in a financial market toward the direction of price movements — whether optimistic (bullish) or pessimistic (bearish) — at a given point in time.
Market Surveillance(trading surveillance)
Market surveillance is the systematic monitoring of trading activity by securities exchanges, FINRA, and the SEC to detect and investigate manipulative practices, unusual trading patterns, potential insider trading, front-running, layering, spoofing, and other conduct that may violate securities laws or exchange rules.
Market-Cap Weighted Index(cap-weighted index)
A market-cap weighted index assigns each constituent stock a weight proportional to its total market capitalization — or free-float-adjusted market capitalization — relative to the combined capitalization of all index members, so that larger companies automatically exert greater influence on the index level than smaller ones.
Master Limited Partnership(MLP)
A Master Limited Partnership (MLP) is a publicly traded limited partnership structure predominantly used in the US energy infrastructure sector, combining the tax efficiency of a partnership with the liquidity of publicly traded securities, and typically offering high distribution yields tied to fee-based pipeline and midstream revenues.
Mega-Cap Stock(mega cap)
A mega-cap stock is a publicly traded company with a market capitalization of $200 billion or more, representing the largest corporations in the world whose stock prices and weightings have an outsized influence on major market indices.
Meme Stock
A Meme Stock is a stock whose price is driven primarily by social media buzz, online community sentiment, and viral momentum rather than by the company's underlying fundamentals, often resulting in extreme price volatility disconnected from business performance.
Mid-Cap Stock(mid cap)
A mid-cap stock is a publicly traded company with a market capitalization typically between $2 billion and $10 billion, occupying a middle ground between the higher growth potential of small-cap companies and the stability of large-cap firms.
Momentum Investing
Momentum Investing is the strategy of buying securities that have exhibited strong recent price performance and selling or avoiding those with weak recent performance, based on the empirical tendency for short-to-medium-term trends to persist.
NASDAQ(National Association of Securities Dealers Automated Quotations)
NASDAQ (National Association of Securities Dealers Automated Quotations) is the second-largest U.S. stock exchange by market capitalization and the world's first fully electronic stock market, known for listing many of America's leading technology companies. It operates as an electronic communication network rather than a physical trading floor.
NASDAQ Composite(COMP)
The NASDAQ Composite is a market-capitalization-weighted index that tracks more than 3,000 companies listed on the NASDAQ stock exchange, making it one of the broadest U.S. equity benchmarks and a widely used gauge of the technology and growth sector. It is heavily weighted toward technology, consumer discretionary, and healthcare companies.
National Market System(NMS)
The National Market System (NMS) is the integrated framework of rules, infrastructure, and regulatory requirements established under Regulation NMS by the SEC in 2005 to link all U.S. equity exchanges and trading venues into a unified marketplace that promotes best execution, price transparency, fair access, and competitive order interaction.
New Highs/New Lows(52-week highs and lows)
New highs and new lows are daily breadth statistics that count the number of stocks on a given exchange reaching their highest or lowest price in the past 52 weeks, used as a market health indicator by tracking the momentum of individual securities at the extremes.
Nifty Fifty (1970s)
The Nifty Fifty was an informal grouping of fifty large-cap US stocks in the 1960s and early 1970s that institutional investors treated as one-decision growth investments, bidding their valuations to extreme levels before the group suffered catastrophic declines in the 1973 to 1974 bear market.
Nixon Shock
The Nixon Shock refers to the economic policy announcements made by President Richard Nixon on August 15, 1971, most consequentially the suspension of the US dollar's convertibility to gold, which ended the Bretton Woods international monetary system and ushered in the era of floating exchange rates.
NYSE(New York Stock Exchange)
The New York Stock Exchange (NYSE) is the world's largest stock exchange by market capitalization, located on Wall Street in New York City, where shares of thousands of U.S. and international corporations are listed and traded. Founded in 1792, the NYSE is operated by Intercontinental Exchange (ICE) and is regulated by the SEC.
Options Expiration (OpEx) Effect(OpEx)
The Options Expiration (OpEx) Effect refers to the market-moving dynamics that occur around monthly and weekly options expiration dates, driven by dealer delta-hedging activity, gamma exposure concentration, and the mechanical repositioning of large options positions as contracts approach settlement.
OTC Market(over-the-counter market)
The OTC (over-the-counter) market is a decentralized network where securities not listed on formal exchanges like NYSE or NASDAQ are traded directly between dealers and investors via electronic systems.
Outstanding Shares(shares outstanding)
Outstanding shares (or shares outstanding) refers to all shares of a company's stock that have been issued and are currently held by shareholders — including institutional investors, retail investors, and company insiders — but excluding treasury shares that have been repurchased and are held by the company itself. Outstanding shares form the basis for calculating key metrics including market capitalization and earnings per share.
Penny Stock(micro-cap stock)
A penny stock is a stock that trades at a low price, typically below $5 per share according to the SEC's definition, and is usually issued by a small company with limited operating history, low market capitalization, and minimal regulatory reporting requirements. Penny stocks in the U.S. often trade on OTC (over-the-counter) markets rather than on major exchanges like the NYSE or NASDAQ.
Pink Sheets(OTC Pink)
Pink Sheets refers to the lowest tier of the OTC equity market in the United States, where companies with minimal reporting requirements — including many speculative, shell, or foreign stocks — are quoted by broker-dealers.
Preferred Stock(preferred shares)
Preferred stock is a class of equity that carries priority over common stock for dividend payments and asset claims in liquidation, but typically does not confer voting rights.
Premarket Trading(pre-market trading)
Premarket trading is the buying and selling of stocks on electronic markets before the official NYSE and NASDAQ open at 9:30 a.m. Eastern Time, typically available from 4:00 a.m. to 9:30 a.m. ET.
Presidential Election Cycle(four-year election cycle)
The Presidential Election Cycle Theory is a historically observed pattern in US equity markets suggesting that stock returns have tended to follow a four-year cycle aligned with the US presidential election calendar, with the third year of a presidential term historically being the strongest for equities on average.
Price-Weighted Index(price-weighted average)
A price-weighted index calculates its level by averaging the share prices of its constituent stocks, so that higher-priced shares carry greater weight regardless of company size, total market value, or shares outstanding — a methodology that dominated early U.S. index design but is now considered an anomaly among modern benchmarks.
Proxy Vote(proxy voting)
A proxy vote is a mechanism that allows shareholders to authorize another party — or a formal ballot — to vote their shares on their behalf at a corporate shareholder meeting.
Put-Call Ratio(P/C ratio)
The put-call ratio is a sentiment indicator calculated by dividing the number of put options traded by the number of call options traded over a given period, used to gauge whether options market participants are positioned more defensively (puts) or aggressively (calls).
Quad Witching(quadruple witching)
Quad Witching refers to the simultaneous expiration of four classes of derivative contracts — stock index futures, stock index options, individual stock options, and single-stock futures — which occurs on the third Friday of March, June, September, and December each year and is typically associated with elevated trading volume and short-term price volatility.
Random Walk Theory(random walk hypothesis)
Random Walk Theory holds that stock price changes are statistically independent of one another and follow a random path, meaning past price movements contain no useful information for predicting future price movements.
Reconstitution(index rebalancing)
Reconstitution is the periodic process by which an index provider reviews, adds, removes, or reclassifies constituent securities to ensure the index continues to accurately represent its intended market segment, investment universe, or factor exposure according to the rules defined in the index's published methodology.
Record Date
The record date is the date set by a company's board of directors on which an investor must be registered as a shareholder in the company's books to be eligible to receive a declared dividend or participate in a rights offering.
Reddit (WallStreetBets)
WallStreetBets (r/wallstreetbets) is a Reddit community focused on high-risk, speculative trading that rose to global prominence in January 2021 when its members coordinated buying in GameStop and other heavily shorted stocks, challenging institutional short sellers and reshaping conversations about retail investor power.
Registered Exchange(national securities exchange)
A registered exchange is a trading venue formally registered with the SEC under Section 6 of the Securities Exchange Act of 1934, meeting statutory requirements for fair and orderly markets, investor protection, and SRO governance, and thereby authorized to operate as a national securities exchange with all associated regulatory obligations and privileges.
Retail Investor(individual investor)
A Retail Investor is a non-professional individual who buys and sells securities for their own personal account rather than on behalf of an institution, generally afforded stronger regulatory protections but with less access to certain private markets and institutional pricing than professional counterparts.
Roaring Twenties Market
The Roaring Twenties Market refers to the extraordinary bull market in US equities from 1921 to 1929, fueled by technological transformation, consumer credit, and speculative excess, that ended with the catastrophic crash of October 1929.
Royalty Trust
A Royalty Trust is a type of publicly traded trust that holds royalty interests in oil, gas, or other natural resource producing properties, distributing the income generated from those royalties directly to unitholders with no corporate-level tax and a distribution stream that declines as underlying reserves are depleted.
Russell 2000(RUT)
The Russell 2000 is a stock market index tracking the 2,000 smallest companies within the Russell 3000 Index, widely used as the benchmark for U.S. small-cap equity performance.
S&P 500(S&P)
The S&P 500 (Standard & Poor's 500) is a market-capitalization-weighted index that tracks the performance of 500 of the largest publicly traded companies listed on U.S. stock exchanges, widely regarded as the most representative benchmark of the overall U.S. equity market. It is maintained by S&P Dow Jones Indices.
Sahm Rule(Sahm recession indicator)
The Sahm Rule is a real-time recession indicator developed by economist Claudia Sahm that signals the start of a recession when the three-month moving average of the national unemployment rate rises by 0.5 percentage points or more above its low from the prior 12 months.
Santa Claus Rally
The Santa Claus Rally refers to a historical tendency for US equity markets to record positive returns during the last five trading days of December and the first two trading days of January, a period first identified by market analyst Yale Hirsch in the Stock Trader's Almanac.
Secondary Offering(follow-on offering)
A secondary offering is a sale of shares to the public after a company's initial public offering (IPO), either issuing new shares (dilutive) or allowing existing shareholders to sell their holdings (non-dilutive).
Sector Classification (GICS)(GICS)
The Global Industry Classification Standard (GICS) is a four-tiered hierarchical framework developed jointly by MSCI and S&P Dow Jones Indices in 1999 to categorize publicly traded companies into eleven sectors, twenty-four industry groups, sixty-nine industries, and one hundred fifty-eight sub-industries based on their principal business activity and primary revenue source.
Sector Rotation
Sector rotation is the movement of investment capital from one industry sector to another as economic conditions, interest rate expectations, or market cycles shift, causing certain sectors to outperform or underperform the broader market.
Self-Regulatory Organization(SRO)
A self-regulatory organization (SRO) in the U.S. securities industry is a non-governmental entity authorized by the SEC to write and enforce rules governing its member firms and, in the case of exchanges, the trading of securities on their markets — operating as a first line of regulatory oversight under SEC supervision.
Sell in May(Sell in May and Go Away)
Sell in May (and Go Away) is a market adage capturing the historically observed tendency for US and global equity markets to generate lower average returns during the May-through-October period compared to the November-through-April period, suggesting a seasonal pattern in six-month equity performance.
Settlement Date(T+1)
The settlement date is the day on which a securities transaction is finalized, with the buyer's account officially debited for the purchase price and the seller's account credited, and ownership of the securities legally transferred.
Share(unit of stock)
A share is a single unit of ownership in a company or financial asset, representing the smallest denomination into which a company's stock is divided. Owning shares entitles the holder to a proportional claim on the company's profits and assets.
Shareholder Equity(stockholders equity)
Shareholder equity is the residual interest in a company's assets after all liabilities have been deducted, representing the net worth attributable to stockholders as reported on the balance sheet.
Short Interest(short ratio)
Short interest is the total number of shares of a given stock that have been sold short and not yet covered or closed out, typically expressed as a percentage of the total shares available for trading (the float) and published twice monthly by FINRA.
Short Squeeze
A short squeeze is a rapid, self-reinforcing surge in a stock's price caused when short sellers are forced to buy back their borrowed shares to cut losses, adding buying pressure to an already rising price and driving the stock sharply higher in a feedback loop.
Small-Cap Stock(small cap)
A small-cap stock is a publicly traded company with a market capitalization typically between $300 million and $2 billion, representing smaller businesses that may offer higher growth potential alongside elevated risk and lower liquidity compared to larger peers.
South Sea Bubble
The South Sea Bubble was an eighteenth-century British financial mania centered on the South Sea Company, whose stock soared on promises of trade monopoly profits before collapsing in 1720 and ruining thousands of investors, including Isaac Newton.
SPAC(blank check company)
A SPAC (Special Purpose Acquisition Company) is a shell company that raises capital through an IPO with the sole purpose of finding and merging with a private operating company to take it public.
Specialist(Designated Market Maker)
A specialist — now formally called a Designated Market Maker (DMM) on the NYSE — is a firm assigned to manage the auction market for a specific stock, maintaining fair and orderly trading and serving as the buyer or seller of last resort.
Stock(equity)
A stock is a financial instrument that represents a unit of ownership in a corporation, entitling the holder to a proportional claim on the company's assets and earnings. In the United States, stocks are bought and sold on regulated exchanges such as the NYSE and NASDAQ.
Stock Split(share split)
A stock split is a corporate action in which a company increases its total number of outstanding shares by issuing additional shares to existing shareholders in proportion to their holdings, reducing the price per share by the same ratio without changing the company's total market capitalization. The most common split ratios in U.S. markets are 2-for-1 and 3-for-1.
Street Name (Securities)(nominee name)
Holding securities 'in street name' means that a broker-dealer or custodian is the registered legal owner of the shares on the company's transfer agent records, while the investor is the beneficial owner — the arrangement used for virtually all securities held in brokerage accounts.
Sub-Industry(GICS sub-industry)
A sub-industry is the most granular tier of the GICS classification hierarchy, representing a narrowly defined business activity within which individual companies are assigned their primary classification, and serving as the basis for the peer group comparisons used by index providers, research analysts, and relative valuation frameworks.
Supplemental Liquidity Provider(SLP)
A Supplemental Liquidity Provider (SLP) is a registered market participant on the NYSE that commits to electronically posting displayed limit orders in assigned securities for a specified minimum percentage of the trading day in exchange for enhanced rebates on liquidity-adding trades, serving as an electronic complement to the Designated Market Maker system.
Survivorship Bias
Survivorship Bias is the logical error of evaluating only successful outcomes — funds, companies, or strategies that still exist — while ignoring the failures that have disappeared, producing overly optimistic assessments of average performance.
SVB Bank Run (2023)
The SVB Bank Run of March 2023 was the second-largest bank failure in US history, in which Silicon Valley Bank — a lender central to the technology startup ecosystem — collapsed within 48 hours after a deposit flight triggered by concerns about losses in its bond portfolio.
Taper Tantrum (2013)
The Taper Tantrum of 2013 was a sharp, market-driven increase in US Treasury yields triggered by Federal Reserve Chairman Ben Bernanke's suggestion that the Fed might begin reducing its bond-buying program, demonstrating how deeply financial markets had come to depend on central bank support.
Ticker Symbol(stock ticker)
A ticker symbol (or stock ticker) is an abbreviation of letters (and sometimes numbers) used to uniquely identify a publicly traded security on a stock exchange. In the United States, NYSE-listed companies typically use one-to-three-letter symbols, while NASDAQ-listed companies typically use four or five letters.
Trading Halt(trading suspension)
A trading halt is a temporary suspension of trading in a specific security or across an entire exchange, implemented by regulators or exchange operators to allow markets to digest significant news or restore orderly conditions.
Treasury Stock(buyback shares)
Treasury stock consists of shares that a company has repurchased from shareholders and holds on its own balance sheet, reducing the number of shares outstanding without canceling the authorization.
Triple Witching(triple witching hour)
Triple witching refers to the simultaneous expiration of three classes of derivatives contracts — stock index futures, stock index options, and individual stock options — that occurs on the third Friday of March, June, September, and December, often producing elevated trading volumes and intraday price volatility as market participants close, roll, or exercise expiring positions.
Tulip Mania
Tulip Mania was a speculative bubble in the Dutch Republic during the 1630s in which the prices of certain tulip bulb varieties rose to extraordinary levels before collapsing abruptly in February 1637, becoming one of history's most cited early examples of speculative excess.
Turn-of-Month Effect(month-end effect)
The Turn-of-Month Effect is a historically observed pattern in which US equity markets have tended to generate a disproportionate share of their monthly returns in a narrow window surrounding the final trading day of one month and the first few trading days of the following month.
Value Stock(undervalued stock)
A value stock is a share that appears to trade below its intrinsic worth based on fundamental metrics such as earnings, book value, or cash flow — typically offering a low price-to-earnings or price-to-book ratio relative to the broader market.
VIX (Volatility Index)(VIX)
The VIX, formally known as the CBOE Volatility Index, measures the market's expectation of future 30-day volatility in the S&P 500, derived from the prices of S&P 500 options, and is widely used as a gauge of market fear and uncertainty.
Volcker Shock
The Volcker Shock refers to the Federal Reserve's aggressive interest rate policy of 1979 to 1981, under Chairman Paul Volcker, which raised the federal funds rate above 20% to break the back of double-digit inflation at the cost of severe recessions.
Volmageddon (2018)
Volmageddon refers to the market events of February 5 to 6, 2018, when a sudden spike in equity volatility caused the collapse of several exchange-traded products designed to profit from low volatility, wiping out billions of dollars in investor capital in a single session.
Volume(trading volume)
Volume in stock market context refers to the total number of shares of a security that are traded during a given time period, typically a single trading day. It is one of the most closely watched data points in financial markets, used by traders and analysts to gauge the strength of price movements and market interest in a particular security.
Voting Rights
Voting rights are the privileges granted to shareholders to cast votes on key corporate decisions, typically one vote per share of common stock, exercised at annual or special shareholder meetings.
Wilshire 5000(Wilshire 5000 Total Market Index)
The Wilshire 5000 Total Market Index is the broadest U.S. stock market index, designed to track the performance of all U.S.-headquartered equity securities with readily available prices, often called the 'total stock market index.'
Window Dressing
Window Dressing is the practice by mutual fund and institutional portfolio managers of buying well-performing stocks and selling poorly-performing ones near the end of a reporting period, with the goal of making the portfolio's disclosed holdings look more attractive to clients and in regulatory filings.
Yield Curve Recession Signal(inverted yield curve)
The Yield Curve Recession Signal refers to the historically documented relationship between yield curve inversions — when short-term Treasury yields exceed long-term yields — and subsequent US recessions, making it one of the most widely watched leading indicators of economic downturns.