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Mr. Guy

Investing Dictionary

Every term explained in plain English

106 terms

52-Week High

Charts

The highest price a stock has been in the last year

After-Hours Trading

Basics

Trading after the market closes at 4 PM ET

Analyst Consensus

Company Health

The average opinion of professional stock analysts

Average True Range

Charts

How much a stock typically moves in a day

Balance Sheet

Company Health

A snapshot of everything a company owns and owes

Bear Market

Basics

When stocks are falling

Beta

Risk

How much a stock moves compared to the overall market

Bid-Ask Spread

Basics

The gap between what buyers offer and what sellers want

Black Swan

Risk

A rare, unpredictable event that causes massive market disruption

Blue Chip Stock

Basics

A large, stable, well-known company with a long track record

Bollinger Bands

Charts

Lines around a stock's price showing its normal range

Bond

Options & Bonds

A loan you give to a company or government that pays you interest

Book Value

Company Health

What a company is worth on paper if you sold everything and paid all debts

Breakout

Charts

When a stock bursts above a resistance level

Broker

Basics

The app or platform where you buy stocks

Bull Market

Basics

When stocks are going up

Buy and Hold

Strategies

Buy stocks and keep them for years

Buyback

Basics

When a company buys back its own shares

Call Option

Options & Bonds

A contract giving you the right to buy a stock at a set price

Candlestick

Charts

A chart shape that shows a stock's price movement in a time period

Concentration Risk

Risk

Too much money in one stock, sector, or asset type

Contrarian Investing

Strategies

Buying what everyone else is selling, and selling what everyone is buying

Correlation

Risk

How closely two investments move together

Counterparty Risk

Risk

The risk that the other side of a deal can't hold up their end

Covered Call

Options & Bonds

Selling someone else the right to buy your stock at a higher price

Credit Rating

Options & Bonds

A grade for how likely a borrower is to repay their debt

Cup and Handle

Charts

A bullish chart pattern shaped like a coffee cup

Day Trading

Basics

Buying and selling stocks within the same day

Death Cross

Charts

A bearish signal when a short-term average falls below a long-term one

Debt-to-Equity

Company Health

How much a company borrowed vs. what it actually owns

Diversification

Risk

Not putting all your eggs in one basket

Dividend

Basics

Cash a company pays you just for owning their stock

Dividend Growth Investing

Strategies

Investing in companies that consistently grow their dividend every year

Dollar-Cost Averaging

Strategies

Invest a fixed amount every month no matter what

Double Bottom

Charts

A "W" shaped pattern that signals a potential reversal upward

Drawdown

Risk

How much your investment dropped from its peak

DRIP

Strategies

Automatically reinvesting dividends to buy more shares

Earnings Report

Company Health

A company's quarterly report card

EBITDA

Company Health

Earnings before interest, taxes, depreciation, and amortization

EPS

Company Health

How much profit a company makes per share

ETF

Basics

A basket of many stocks in one

Expiration Date

Options & Bonds

The last day an option can be used

Federal Reserve

Basics

The US central bank that controls interest rates and the money supply

Fibonacci Retracement

Charts

Key price levels where a stock might pause or reverse

Forward P/E

Company Health

P/E ratio based on expected future earnings, not past ones

Free Cash Flow

Company Health

Actual cash left after all expenses

Gap Up / Gap Down

Charts

When a stock opens much higher or lower than it closed

Going Long

Basics

Buying a stock expecting it to go up

Golden Cross

Charts

A bullish signal when a short-term average crosses above a long-term one

Gross Margin

Company Health

Revenue left after subtracting the direct cost of making the product

Growth Investing

Strategies

Buying companies growing fast even if expensive

Guidance

Company Health

A company's prediction for their own future performance

Head and Shoulders

Charts

A chart pattern that often signals a trend reversal

Hedge

Risk

An investment that offsets losses in another

Implied Volatility

Options & Bonds

The market's expectation of how much a stock will move

Index

Basics

A scoreboard for a group of stocks

Index Investing

Strategies

Buying funds that track the whole market instead of picking stocks

Inflation

Basics

Prices rising over time, making your money worth less

Insider Trading (Legal)

Strategies

Tracking what company executives are buying

IPO

Basics

When a company goes public for the first time

Leverage

Risk

Using borrowed money or financial instruments to amplify your investment

Limit Order

Basics

Buy or sell only at a specific price or better

Liquidity

Basics

How easy it is to buy or sell something quickly

MACD

Charts

A momentum indicator showing when a trend might be changing

Margin

Risk

Borrowing money from your broker to buy more stocks

Market Cap

Basics

Total value of a company

Market Order

Basics

Buy or sell immediately at whatever price is available

Momentum Investing

Strategies

Buying stocks that are already going up

Moving Average

Charts

The average price of a stock over a set number of days

Mutual Fund

Basics

A pool of money from many investors managed by a professional

Operating Income

Company Health

Profit from the core business before taxes and interest

P/E Ratio

Company Health

How expensive a stock is compared to its profits

Penny Stock

Basics

A very cheap stock, usually from a tiny or risky company

Portfolio

Basics

All your investments together

Position Sizing

Risk

Deciding how much of your money to put in one stock

Pre-Market Trading

Basics

Trading that happens before the market officially opens

Price-to-Book (P/B)

Company Health

Stock price vs. the company's net assets

Price-to-Sales (P/S)

Company Health

How much investors pay for each dollar of a company's revenue

Profit Margin

Company Health

What percentage of revenue becomes actual profit

Put Option

Options & Bonds

A contract giving you the right to sell a stock at a set price

Rebalancing

Strategies

Adjusting your portfolio back to your target allocation

REIT

Basics

A company that owns real estate you can buy like a stock

Resistance Level

Charts

A price where a stock tends to stop rising

Return on Equity

Company Health

How efficiently a company uses shareholder money to make profit

Revenue

Company Health

Total money a company brings in

Risk/Reward Ratio

Risk

Comparing how much you could lose vs. how much you could gain

RSI

Charts

A score (0–100) showing if a stock is overbought or oversold

Sector

Basics

A group of companies in the same type of business

Sector Rotation

Strategies

Moving money between sectors depending on the economic cycle

Share

Basics

One unit of a stock

Short Interest

Risk

How many people are betting a stock will fall

Short Selling

Risk

Betting that a stock will go down

Stock

Basics

A tiny piece of ownership in a company

Stock Split

Basics

When a company divides its shares into more, cheaper pieces

Stop Loss

Risk

An automatic sell order if a stock drops too much

Strike Price

Options & Bonds

The price at which an option lets you buy or sell

Support Level

Charts

A price where a stock tends to stop falling

Swing Trading

Strategies

Holding stocks for days to weeks to capture medium-term moves

Tax-Loss Harvesting

Strategies

Selling losing investments to reduce your tax bill

Ticker Symbol

Basics

The short code used to identify a stock

Value Investing

Strategies

Buying stocks that are cheaper than they're worth

Volatility

Risk

How wildly a stock's price swings

Volume

Charts

How many shares were traded today

Working Capital

Company Health

A company's short-term financial cushion

Yield

Basics

The income you earn on an investment as a percentage

Yield Curve

Options & Bonds

A graph showing interest rates at different loan lengths

Definitions and explanations are for educational purposes only. Not financial advice. Finance concepts can have nuances beyond what is shown here — always consult authoritative sources and qualified professionals for decisions.