Market Securities Glossary

500+ financial terms,
explained simply

A plain-English reference for every term you'll encounter while trading — from stocks and options to crypto, bonds, and macro. No jargon. No gatekeeping.

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Term Browser

Browse 540+ financial terms

Filter by category, jump to a letter, or search by term or keyword. Click any term for the full definition, example, and related concepts.

Category
Letter
Showing 66 of 66 terms
Intermediate
Stocks

Excess return of an investment vs. its benchmark after adjusting for risk.

Beginner
Stocks

Sustained decline of 20%+ from a recent peak.

Beginner
Stocks

Volatility of an asset relative to the overall market.

Intermediate
Crypto

Distributed, immutable ledger recording transactions across computers.

Intermediate
Technical

Volatility bands placed 2 standard deviations above and below a 20-day MA.

Beginner
Stocks

Sustained period of rising prices, typically 20%+ off a trough.

Intermediate
Options

Right (not obligation) to buy an asset at a strike price before expiry.

Beginner
Tax

Profit from selling an asset; taxed differently by holding period.

Advanced
Bonds

Second-derivative of bond price vs. yield; curvature of duration.

Beginner
Bonds

The periodic interest payment made by a bond.

Intermediate
Macro

Consumer Price Index; main US inflation gauge.

Intermediate
Bonds

Assessment of a bond issuer's ability to repay debt.

Beginner
Crypto

Digital currency using cryptography and blockchain, no central authority.

Advanced
Crypto

Decentralized Finance; financial services on public blockchains.

Intermediate
Macro

Sustained decrease in the general price level.

Advanced
Options

Change in option price for a $1 move in the underlying.

Intermediate
Behavioral

Tendency to sell winners too early and hold losers too long.

Beginner
Risk

Spreading investments to reduce risk.

Beginner
Stocks

Annual dividend per share divided by stock price.

Intermediate
Bonds

Sensitivity of a bond's price to interest rate changes.

Beginner
Stocks

A basket of securities that trades like a single stock.

Beginner
Options

The date an option contract becomes void.

Intermediate
Macro

Overnight rate banks charge each other; set by the Federal Reserve.

Intermediate
Technical

Horizontal support/resistance levels based on Fibonacci ratios.

Advanced
Crypto

Change to a blockchain's protocol, splitting the chain.

Advanced
Options

Rate of change of delta for a $1 move in the underlying.

Intermediate
Crypto

Fee paid to process a transaction on a blockchain.

Beginner
Macro

Total value of goods and services produced in a country.

Advanced
Options

Sensitivity measures of option price to various inputs.

Intermediate
Crypto

Total computational power securing a Proof-of-Work blockchain.

Advanced
Options

Market's forecast of future volatility, derived from option prices.

Intermediate
Regulatory

Trading on material non-public information; illegal under SEC rules.

Intermediate
Stocks

First sale of a company's stock to the public.

Intermediate
Bonds

High-yield bond rated below investment grade (BB+ or lower).

Intermediate
Risk

Using borrowed capital to increase position size.

Beginner
Stocks

Order to buy/sell at a specified price or better.

Beginner
Stocks

How easily an asset can be bought/sold without moving the price.

Beginner
Behavioral

Cognitive bias where losses hurt ~2x as much as equivalent gains feel good.

Intermediate
Technical

Moving Average Convergence Divergence; trend-following momentum indicator.

Intermediate
Risk

Borrowed money from a broker to amplify positions.

Beginner
Stocks

Total value of a company's outstanding shares.

Beginner
Technical

Average of past prices over a window; smooths trends.

Beginner
Stocks

Pooled investment vehicle priced once daily.

Beginner
Stocks

Stock price divided by annual earnings per share.

Intermediate
Options

Right (not obligation) to sell an asset at a strike price before expiry.

Advanced
Macro

Central bank buys long-term securities to inject liquidity and lower rates.

Beginner
Macro

Significant decline in economic activity across the economy.

Beginner
Technical

Price level where sellers tend to emerge, halting advances.

Advanced
Options

Change in option price for a 1% change in interest rates.

Beginner
Technical

Momentum oscillator from 0-100; overbought/oversold gauge.

Beginner
Regulatory

US Securities and Exchange Commission; primary markets regulator.

Intermediate
Risk

Risk-adjusted return: excess return per unit of volatility.

Intermediate
Stocks

Borrowing shares to sell, hoping to buy back lower.

Beginner
Stocks

Difference between bid and ask prices.

Beginner
Crypto

Cryptocurrency pegged to a stable asset, usually the US dollar.

Intermediate
Macro

Stagnant growth + high inflation + high unemployment.

Beginner
Risk

Order to sell once price hits a threshold, limiting losses.

Beginner
Options

The price at which an option can be exercised.

Beginner
Technical

Price level where buyers tend to step in, halting declines.

Advanced
Options

Daily decay of an option's value as expiration approaches.

Beginner
Bonds

US government debt; considered the risk-free benchmark.

Advanced
Risk

Maximum expected loss over a time horizon at a confidence level.

Advanced
Options

Change in option price for a 1% change in implied volatility.

Beginner
Risk

How much and how fast prices move; measured by standard deviation.

Intermediate
Tax

Selling a security at a loss and rebuying within 30 days; loss disallowed.

Intermediate
Macro

Graph of yields across bond maturities.

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A new term highlighted every day, hand-picked by our editorial team.

FeaturedOptionsAdvanced

Implied Volatility

Implied volatility (IV) is the volatility input that, plugged into Black-Scholes, produces the observed option price. High IV = expensive options; low IV = cheap options. IV tends to mean-revert and spikes before catalysts (earnings, FDA). Selling high-IV options is a core volatility strategy.

Example

An AAPL call trading at $8 implies ~30% annualized volatility. If realized vol comes in at 20%, the seller profits.

Why it matters

IV is the only option input not directly observable — it's the market's expectation of future volatility. Reading IV (via VIX, IV rank, IV percentile) tells you whether options are cheap or expensive, which is critical for deciding whether to buy or sell premium.

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Term

Alpha

StocksIntermediate

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Definition

Excess return of an investment vs. its benchmark after adjusting for risk.

A fund returns 14% while its benchmark returns 10% with similar risk — that's +4% alpha.

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What does P/E ratio measure?

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New This Month

Recently added terms

We publish 5-10 new terms every week. Here are the latest additions to the glossary.

NewCrypto

Added 2 days ago

NewOptions

Added 5 days ago

NewBonds

Added 1 week ago

NewBehavioral

Added 1 week ago

NewCrypto

Added 2 weeks ago

NewOptions

Added 2 weeks ago

NewMacro

Added 3 weeks ago

NewRisk

Added 3 weeks ago

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Frequently asked questions

Everything you need to know about how the glossary is curated, maintained, and used.

Our editorial team — staffed by CFA charterholders, former sell-side analysts, and active traders — reviews every term. Definitions are written in plain English, vetted for technical accuracy, and updated as markets evolve. Each term includes a real-world example to anchor the concept.

540+ terms and counting

Market Securities Glossary

Master the language of finance

Every term you'll encounter while trading — explained in plain English, with examples you'll actually remember. Start with the basics, work up to advanced concepts, and test yourself along the way.

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