Investing glossary

Plain-English definitions of the words you’ll meet across Finisdom — each with where the number comes from, where it helps.

13F filing: A quarterly list of US share holdings that large investment firms must publish. Due up to 45 days after the quarter ends, and it shows only long share positions.; From: Filed with the SEC; Finisdom reads them directly.
Asset class: A family of investments that behave alike — stocks, bonds, gold/commodities, crypto, or cash.
Backtest: A “what if” test that replays a mix through real past prices to see how it would have done.; From: Uses each investment’s historical prices.
Base rate: What actually happened after past situations that looked like this one — a count of history, not a forecast. Always read it with its sample size.
Beat/miss: Whether a company’s results came in above or below what was expected. Finisdom compares against the same quarter a year earlier rather than against analyst forecasts.
Beta: How much something moves compared to the whole stock market. 1 means it moves about the same; above 1 means bigger swings.; From: Measured against the S&P 500’s price history.
Bond: A loan you make to a government or company that pays you steady interest. Usually calmer than stocks.
Breakeven inflation: How much inflation the bond market expects, worked out by comparing a normal government bond’s yield to an inflation-protected one of the same length.; From: The 10-year breakeven series, via FRED.
Candlestick: A chart shape for one slice of time. The body shows the open and close; the wicks show the high and low.
CAPE: A way to judge if stocks look cheap or expensive by comparing prices to many years of earnings.; From: Based on long-run S&P 500 earnings data.
Cash: Money sitting on the side, not invested. Very safe, but it barely grows.
Credit spread: The extra yield a bond pays over a “safe” government bond, as payment for the risk it might not be repaid. Widens when investors get nervous, narrows when they’re calm.; From: The ICE BofA high-yield OAS series, via FRED.
Diluted EPS: Earnings per share counted as if every share option and convertible were exercised — the more conservative, more comparable number.
Divergence: When two markets that normally move together pull unusually far apart. The gap flags that something changed — it doesn’t say which side is wrong.
Diversification: Spreading money across different things so one bad day doesn’t sink you. “Don’t put all your eggs in one basket.”
Drawdown: The worst drop from a high point to a low point. “Max drawdown” is the deepest one.; From: Measured from daily price history.
Drift: When your mix slowly slides away from your plan because some parts grew faster than others.
Duration: How sensitive a bond’s price is to interest-rate changes. Longer-dated bonds swing more when rates move.
Earnings drift: The tendency for a share price to keep moving in the direction of an earnings surprise for weeks after the report, rather than adjusting all at once.
Effective bets: How many genuinely independent risks a portfolio holds, as opposed to how many holdings. Four holdings driven by the same thing count as roughly one bet, not four.
Efficient frontier: A curve showing the best possible reward for each level of bumpiness. Mixes on the curve are well balanced.
Factor: A shared trait — like being cheap, small, or recently rising — that helps explain why a group of investments moves together and has historically been paid for.
Factor genome: A description of what a portfolio is actually exposed to rather than what it holds, measured against a standard set of factors. Two portfolios with no holdings in common can share a genome.; From: Built from Ken French’s published factor data.
Frozen rule: A strategy written down and locked before its track record begins, so the history describes the strategy that actually ran rather than one adjusted along the way.
Geopolitical risk index: A number that tracks how much newspapers are writing about war, terrorism, and international tension — a way to measure something that used to be pure gut feel.; From: The Caldara–Iacoviello index, updated monthly.
High-yield bond: A bond from a riskier borrower, paying a higher interest rate (a wider spread) to compensate for the extra risk. Also called “junk” bonds.
Idiosyncratic risk: The part of a holding’s movement that shared factors cannot explain — risk specific to that particular company or fund. A portfolio positioned mostly on it is not well described by its genome.
Implied probability: A prediction-market contract’s price, read directly as a percentage chance of that outcome — a contract at 87 cents implies roughly 87%.
Institutional ownership: The share of a company held by professional investment firms rather than individuals. Disclosed quarterly in the US via 13F filings.
Investment grade: A bond from a safer, higher-rated borrower, paying a narrower spread over a government bond than a high-yield borrower would.
Macro: The big-picture view of the whole market and economy, rather than a single investment.
Out-of-sample decay: The tendency for a strategy’s edge to shrink once it is measured on data it was not chosen from. Published market edges have historically lost roughly half their return afterwards.
Point-in-time: Testing a strategy using only what was genuinely available and investable on each past date, so companies that later failed are not quietly excluded from history.
Portfolio: Everything you own as an investor, plus any cash, treated as one basket.
Prediction market: A market where people trade contracts that pay out based on whether a real-world event happens — its price behaves like a real-money-backed probability.
Quarterly report: The results a listed company publishes every three months — revenue, profit, and earnings per share, filed with the regulator.
Real yield: A bond’s interest rate after stripping out expected inflation — what you actually earn in buying power. Gold tends to fall when it rises.; From: The 10-year TIPS yield, via FRED.
Rebalancing: Trimming the parts that grew too big and topping up the ones that shrank, to get back to your plan.
Retention: The share of a backtested claim a strategy actually delivered after it was published — live result divided by claimed result. Above 100% means it beat its own backtest.
Risk: The chance your money goes down before it goes up. More possible reward usually means more risk.
Risk-free rate: What you could earn with almost no risk, like a short U.S. government bill. A baseline to compare against.; From: The 3-month U.S. Treasury rate from FRED.
Seasonality: A regular yearly rhythm in a business — a retailer earning most at Christmas. Comparing like quarter to like quarter cancels it out.
Sharpe ratio: A score of reward earned for the bumpiness taken. Higher is better; near or above 1 is good.; From: Built from your returns vs. their bumpiness, minus the risk-free rate.
Standard deviation: A measure of how much something normally moves around its own average. Saying a result is “two standard deviations out” means it is unusual for that thing.
Stock: A tiny piece of ownership in a company. Can grow a lot over time, but bounces around.
Survivorship bias: Judging the past using only what made it to the present. Testing on today’s surviving companies hides everyone who went bust and flatters the result.
VIX: The market’s “worry meter”. High means investors are nervous; low means calm.; From: Published via FRED (U.S. Federal Reserve data).
Volatility: How bumpy something is — how much its value jumps around. Higher means a wilder ride.; From: Calculated from daily price history.
Volatility risk premium: The gap between the volatility the market expects (the VIX) and what actually happened. Extremes flag complacency or panic.
Yield curve: A line of interest rates for different lengths of time. Its shape hints at where the economy may be heading.; From: U.S. Treasury rates from FRED.
Z-score: How far something sits from its own normal, counted in standard deviations. Zero is business as usual; beyond ±2 is unusual.

Education only — not investment advice.