Jargon decoder
What on earth does that word mean?
You already know you want to invest. The hard bit is the language. Type any word or acronym you've bumped into and you'll get one straight sentence back — no finance background needed.
The basics
Base rate
The interest rate the Bank of England sets. Savings and mortgage rates usually follow it up and down, though never exactly.
Bond
A loan you make to a company or a government. They pay you interest and give your money back on an agreed date.
Broker
The company that actually buys and sells investments for you and holds them on your behalf.
AJ Bell and Hargreaves Lansdown are two big UK ones.
Dividend
A slice of profit a company pays out to shareholders, usually a few times a year. Free money for holding.
A 20p dividend on 100 shares pays you £20.
Equity
Yet another word for shares — ownership in a company, as opposed to lending it money.
Financial advice
A regulated adviser looking at your own circumstances and telling you what to do with your money. It usually costs a fee. Penny does not do this — she explains things in plain English so the decisions stay yours.
Fund
A pot of money from lots of people, invested across many companies at once by one manager or one rule.
Gilt
A bond issued by the UK government. Considered one of the safest places to park money because the government would have to fail to not pay you back.
Index
A list that tracks a group of companies together, so you can see if 'the market' went up or down.
The FTSE 100 is a list of the 100 biggest UK-listed companies.
Index fund
A fund that simply buys everything in an index instead of trying to pick winners. Cheap and boring, which is usually good.
London Stock Exchange
The marketplace where UK shares are bought and sold. The FTSE 100, FTSE 250 and AIM are all lists of companies trading there.
Market cap
market capitalisation
What the whole company is worth right now: the share price multiplied by the number of shares.
£5 a share × 1 billion shares = a £5 billion company.
Portfolio
Everything you own, added together. Your collection.
Share
One small slice of ownership in a company. Own a share and you own a tiny piece of the business.
Buy 10 Tesco shares and you own ten slices out of roughly 7 billion.
Stock
Another word for shares. People say 'stocks' and 'shares' to mean the same thing.
Ticker
The short code a company trades under, like a nickname the stock market uses.
SHEL is Shell, TSCO is Tesco, BP. is BP.
Tracker
A fund that follows a list rather than trying to beat it. It buys everything in the index and charges very little for the privilege.
A FTSE 100 tracker holds all 100 companies in the same proportions as the index.
Upheld
When a complaint is decided in the customer's favour. Firms report this figure to the regulator, who publishes it twice a year.
Acronyms you'll see everywhere
Accumulating
The fund quietly reinvests your dividends back into itself instead of paying them out. Written as (Acc) on the end of a fund name.
AER
Annual Equivalent Rate
The yearly interest rate on savings, written in a standard way so you can compare accounts fairly.
AGM
Annual General Meeting
The once-a-year meeting where shareholders vote on things like pay and board members.
AIM
Alternative Investment Market
London's market for smaller, younger companies. Lighter rules, faster growth sometimes — and far more failures.
APR
Annual Percentage Rate
The yearly cost of borrowing, including fees. If yours is above about 8%, paying the debt off beats investing.
AUM
Assets Under Management
The total pile of money a fund or firm looks after.
CEO / CFO
Chief Executive Officer / Chief Financial Officer
The boss and the money boss. When either leaves suddenly, it's worth asking why.
CGT
Capital Gains Tax
Tax on profit when you sell an investment for more than you paid — but not inside an ISA or pension.
Distributing
The fund pays dividends out to you as cash, usually a few times a year. Written as (Dist) or (Inc) on the end of a fund name.
DRIP
Dividend Reinvestment Plan
An option to automatically use your dividends to buy more shares instead of taking the cash.
EBITDA
Earnings Before Interest, Tax, Depreciation and Amortisation
Profit before a lot of the awkward costs are taken off. Useful for comparing companies, but treat it with suspicion — it flatters the numbers.
EPS
Earnings Per Share
The company's profit divided by the number of shares — how much profit each share you own earned.
£100m profit and 500m shares = 20p of earnings per share.
ETF
Exchange-Traded Fund
A fund you can buy and sell like a single share. One purchase quietly gets you hundreds of companies.
FCA
Financial Conduct Authority
The UK regulator. Only use a broker that is FCA-regulated — check the register before sending anyone money.
FSCS
Financial Services Compensation Scheme
The UK safety net. If a regulated firm goes bust, savings are protected up to £120,000 per banking licence, and investments held with a failed firm up to £85,000. Neither covers your investments simply losing value.
FTSE 100
Financial Times Stock Exchange 100
Pronounced 'footsie'. The 100 largest companies on the London Stock Exchange, used as the headline scoreboard for UK shares.
FTSE 250
Financial Times Stock Exchange 250
The next 250 companies below the FTSE 100 — established but not giants, and mostly earning their money here in the UK.
If the FTSE 100 is the Premier League, this is the Championship.
IPO
Initial Public Offering
The first day a private company sells shares to the public. Often exciting, often overpriced.
ISA
Individual Savings Account
A wrapper around your investments that means the taxman takes nothing from your gains or income. You can put in up to £20,000 a year.
KYC
Know Your Customer
The identity checks a broker legally must do before letting you invest. That's why they ask for your passport.
LSE
London Stock Exchange
The marketplace where UK shares are actually bought and sold.
Nasdaq
An American stock exchange, and the scoreboard named after it. When the news says 'the Nasdaq', they usually mean its 100 largest, mostly technology, companies.
NAV
Net Asset Value
What one unit of a fund is actually worth, based on everything it owns.
OCF
Ongoing Charges Figure
The yearly cost of owning a fund, as a percentage. 0.10% is cheap, 1.5% is expensive and eats your returns.
P/E ratio
Price-to-Earnings ratio
How many years of current profit you're paying for. High means expectations are high; low can mean a bargain or a problem.
£10 share ÷ 50p earnings = a P/E of 20.
RNS
Regulatory News Service
The official channel companies must use to announce anything important. If it matters, it appears here first — not in the newspapers.
ROE
Return On Equity
How much profit the company squeezes out of the money invested in it. Higher is better.
S&P 500
A list of 500 large American companies — the US version of the FTSE 100, but bigger and far more technology-heavy.
SIPP
Self-Invested Personal Pension
A pension you run yourself. The government adds tax relief on top of what you put in, but you can't touch it until your late 50s.
TER
Total Expense Ratio
Same idea as the OCF — the annual cost of a fund. Lower is nearly always better.
UCITS
A European rulebook a fund follows, covering how spread out it must be and what it can hold. Almost every ETF sold in the UK says it.
YTD
Year To Date
How something has performed since 1 January of this year.
Money in and out
Compounding
Earning returns on your past returns. Slow at first, then surprisingly powerful.
£100 a month at 5% is about £15,500 after 10 years — £3,500 of it earned, not paid in.
Custody / platform fee
A small yearly percentage your broker charges just for holding your investments, usually taken monthly.
Dealing fee
The flat charge your broker takes each time you buy or sell, win or lose.
£5.95 a trade means buying and selling once costs you £11.90.
FX fee
Foreign exchange fee
A small percentage taken when your pounds are converted into another currency to buy a share, and again when you sell.
0.5% on a £1,000 US share is £5 each way.
Interest
What cash earns for sitting somewhere. If it's sitting uninvested in a trading account, the platform often earns it rather than you.
P&L
Profit and Loss
How much a holding has made or lost so far. Green up, red down.
Pound cost averaging
Investing the same amount every month instead of all at once, so you're not relying on picking the right day.
Return
What you got back, including both price change and any income.
Spread
The gap between the price to buy and the price to sell at the same moment. You lose it instantly, so it's a hidden cost.
Stamp duty
A 0.5% government tax when you buy most UK shares. Not charged on funds or ETFs.
Stock lending
Your platform lends the shares you own to a big institution, which pays a fee for borrowing them. You keep ownership; the platform usually keeps most of the fee.
Yield
The yearly income something pays, as a percentage of its price.
A 4% yield means £4 a year for every £100 invested.
Company health
Balance sheet
A snapshot of what a company owns versus what it owes. Healthy means plenty of cash and manageable debt.
Cash flow
Actual money moving in and out of the bank. A company can report profit and still run out of cash — cash is the one that kills you.
Director dealing
When bosses buy or sell their own company's shares. They must declare it publicly. Heavy selling is worth noticing.
Filing
An official document a company must publish by law — accounts, results, changes of director. Facts, not marketing.
Going concern
An accountant's note saying whether the company can survive the next 12 months. A warning here is one of the loudest red flags there is.
Profit
What's left after every cost is paid. Also called the 'bottom line'.
Profit warning
A company telling the market in advance that it will earn less than expected. The share price usually drops the same morning.
Receivables
Money customers owe but haven't paid yet. If this grows much faster than sales, people may not be paying.
Revenue
All the money coming in from sales, before any costs. Also called turnover or the 'top line'.
Buying and selling
End-of-day price
The final price a share settled at when the market closed. One price a day — plenty for slow, considered decisions.
Limit order
Buy or sell only if the price reaches a number you set. Nothing happens unless it does.
Liquidity
How easily you can sell without moving the price. Big companies are easy; tiny ones can be hard to get out of.
Market order
Buy or sell right now at whatever the current price is.
Position
One holding you own. 'Opening a position' just means buying something.
Position size
How much of your pot goes into one idea.
2% of £1,000 is £20 — small enough that being wrong doesn't hurt.
Short selling
Betting a share will fall. Professionals do it; beginners shouldn't, because the losses have no ceiling.
Stop-loss
An automatic sell if the price falls to a level you chose, to cap how much you lose.
Buy at £10 with an 8% stop-loss and it sells automatically at £9.20.
Take-profit
The opposite of a stop-loss: sell automatically once you're up by a set amount, so you actually bank the gain.
Risk and safety
Bear market
A fall of 20% or more. Uncomfortable, normal, and historically temporary.
Bull market
A stretch when prices are generally rising and everyone feels clever.
CFD
Contract for Difference
A bet on a price moving, using borrowed money, rather than owning anything. The firms' own disclosures say most retail accounts lose money.
Correction
A drop of around 10%. Happens most years.
Diversification
Spreading money across lots of different things so one disaster can't sink you.
Drawdown
The worst drop from a high point to a low point. It tells you how uncomfortable the journey was.
£1,000 falling to £700 before recovering is a 30% drawdown.
Emergency fund
Three to six months of spending kept in easy-access cash, so you never have to sell investments at the worst moment.
Inflation
Prices rising over time, so cash quietly buys less each year. It's the reason people invest at all.
Leverage
Trading with borrowed money so a small stake controls a big position. It multiplies losses exactly as much as gains.
10x leverage means a 10% fall wipes out your entire stake.
Offer period
The stretch of time after a possible takeover becomes public, when strict rules apply to what everyone involved can say and do. It ends when a firm offer is made, or the buyer walks away.
Risk
Not just 'losing money' — it's the chance the outcome isn't what you needed, when you needed it.
Short selling
Betting a price will fall, by selling something you don't own and hoping to buy it back cheaper. Losses have no ceiling, because a price can rise forever.
Spread betting
Another way of betting on a price move with borrowed money. Tax-free in the UK, and easy to lose more than you put in.
Volatility
How much the price jumps around. High volatility means a bumpy ride, not necessarily a bad one.
Words this app uses
AI exposure
Our 1–5 guess at how much a company genuinely benefits from the AI boom, where 5 is heavily exposed.
Beginner Safe Mode
The guardrails this desk runs under: small positions, few trades, automatic stop-losses.
Early-warning rule
One of our ten automatic checks for signs of trouble in a company's paperwork.
Hallucination
When an AI states something confidently that isn't true. We check for it and log every case we catch.
Paper trading
Pretend trading with pretend money. Real prices, real fees, nothing ever actually bought or sold.
Reshuffle
The quarterly review where companies are promoted into the FTSE 100 or relegated to the FTSE 250, depending on their size.
March, June, September and December, just like promotion and relegation in football.
Verified
Every number in the note was checked back against the original public document. Unverified means treat it as a rumour.
Win rate
Out of all the closed practice trades, the share that made money.
Three habits worth keeping
- If a word stops you, look it up here. Nobody was born knowing what EBITDA meant.
- Read the source, not the summary. Every fact on this desk links to the original document.
- Fees are not noise. On a £1,000 pot, a £6.95 dealing fee is 0.7% you must earn back before you break even.
