By Antonios Fotakis | July 2026
A note before you read: Volume is one of the most visible numbers on any stock screener or trading platform – and one of the most consistently ignored by beginners. Not because it’s complicated. Because nobody ever explains what it actually tells you, and why it matters more than most people realise.
What is volume in investing. Let me ask you something.
Imagine two markets in two different towns. Both sell the same goods at the same prices.
In the first market, hundreds of buyers and sellers show up every day. Things trade constantly. If you want to sell something, there’s always someone ready to buy. If you want to buy, there’s always someone ready to sell.
In the second market, a handful of people show up on a good day. Sometimes there are buyers and no sellers. Sometimes the opposite. When someone does want to sell, they often have to lower the price significantly just to find a buyer willing to take it.
Same goods. Same prices listed. Completely different experience of actually trading there.That difference – the number of participants, the frequency and size of transactions – is what volume in investing measures in financial markets. And it affects your experience as an investor in ways that most beginners don’t consider until they’ve already felt the consequences.
So What Is Volume in Investing, Exactly?
Volume in investing refers to the total number of shares – or contracts, or units – traded in a given security during a specific time period. Usually measured per day.
If 5 million shares of a company changed hands today – meaning 5 million shares were bought and 5 million shares were sold (every transaction requires both a buyer and a seller) – the daily volume is 5 million shares.
That’s it. Nothing complex in the definition. The depth comes in understanding what that number tells you – and what changes when it’s very high or very low.
Volume in investing measures participation. How many people are actively trading this asset, in what quantities, and how frequently. It tells you how alive the market for this security is.
Why Volume in Investing Matters: The Concept of Liquidity
Volume in investing is most directly connected to a concept called liquidity – and understanding liquidity is one of the most practically important things a beginning investor can learn.
Liquidity refers to how easily you can buy or sell an asset at a fair price without your own transaction significantly affecting that price.
A highly liquid stock – one with very high daily volume – can absorb large buy or sell orders without the price moving much. Millions of shares are changing hands every day, so your order to buy 100 shares or sell 500 shares is a drop in the ocean. You get filled at a price very close to what you saw when you placed the order.
A low-liquidity stock – one with very low daily volume – can be dramatically affected by relatively small orders. If only 10,000 shares trade on a typical day and you try to sell 2,000 shares, your sell order represents 20% of the day’s normal volume. To find enough buyers, you may need to accept a significantly lower price than the last quoted price. You wanted €20 per share. You end up getting €18.50 – not because the company’s value changed, but because there wasn’t enough demand to absorb your supply at the price you wanted.
High volume = high liquidity = easier and fairer to trade. Low volume = low liquidity = harder to trade, more slippage, more risk.
The Bid-Ask Spread: How Low Volume in Investing Costs You Money
There’s a direct financial cost to low liquidity that most beginners don’t see coming – it’s called the bid-ask spread.
When you look at a stock price, there are actually two prices at any moment:
– The bid price – the highest price any buyer is currently willing to pay
– The ask price – the lowest price any seller is currently willing to accept
The difference between them is the spread. When you buy, you pay the ask price. When you sell, you receive the bid price.
In a highly liquid stock, this spread might be a fraction of a cent – essentially invisible. In a low-liquidity stock, the spread can be several percentage points. You buy at €10.50 and immediately the price you could sell at is €9.80. You’re already down 6.7% before the price has moved at all – simply because the market for this stock is thin.
Low volume in investing doesn’t just make trading inconvenient. It makes it more expensive – in a way that never appears as a fee but always appears in your returns.
Volume in Investing and Price Movement: What the Combination Reveals
Volume in investing alone tells you how active a market is. Volume in combination with price movement tells you something far more useful – how meaningful that movement is.
This is where volume in investing becomes genuinely powerful as a signal:
Rising price + rising volume: The price increase is backed by broad participation. Many buyers are actively pushing the price higher. This combination is generally considered a strong signal – the move has conviction behind it.
Rising price + falling volume: The price is going up but fewer and fewer people are participating in the move. It may be running out of buyers. This combination warrants more caution – a price rise without volume support can be fragile.
Falling price + rising volume: Many participants are selling. The decline has broad conviction behind it – a potentially serious signal, especially if it follows a period of accumulation at higher prices.
Falling price + falling volume: The price is drifting lower but few people are actively selling. This can sometimes indicate the selling is exhausting itself – not enough conviction behind the decline for it to continue. Often seen near market bottoms.
These are not rules. They are patterns – and like all patterns in markets, they work until they don’t. But they add a layer of context to price movements that volume-blind investors simply cannot access.
Want to understand how to read market signals and evaluate investments more completely? Get the complete Stocks Explained guide here.
Average Volume vs Today’s Volume: The Spike Signal
On most screeners and financial platforms, you’ll see two volume figures:
Average Volume in investing – the typical number of shares traded per day over a recent period, usually 30 or 90 days. This is the baseline – what normal looks like for this stock.
Current/Today’s Volume in investing – how many shares have traded today so far.
The comparison between the two is where the information lives.
A stock trading at 10x its average volume on a given day is experiencing something unusual. Something has changed – an earnings report, an analyst upgrade or downgrade, a news event, a rumour, a significant institutional buy or sell decision. The volume spike is the market’s way of signalling that something worth investigating has happened.
Volume spikes without obvious news can be particularly interesting – they sometimes precede significant price moves, as large institutional investors accumulate or distribute positions before the reason becomes publicly known.
A volume spike is not a buy or sell signal. It’s an attention signal – a flag that something is happening and it’s worth finding out what.
What Low Volume Stocks Mean for Long-Term Investors
Most of the volume discussion in financial media is aimed at traders – people making short-term decisions based on price and volume patterns. But volume matters for long-term investors too, and in a very specific way.
When you buy a stock with very low daily volume, you’re making an implicit commitment that may be harder to exit than you expect.
Markets can change quickly. A company you bought based on strong fundamentals may face an unexpected problem – a regulatory issue, a failed product launch, a management scandal. The moment you want to sell, you need buyers. In a low-volume stock, those buyers may not be there in the quantity you need, at the price you need, on the timeline you need.
This is a risk that doesn’t appear in any valuation metric. The P/E ratio won’t warn you about it. The profit margin won’t warn you about it. Only volume – and your own awareness of what it means – will tell you that the exit door for this investment is narrower than you might expect.
Liquidity risk is real risk. It just doesn’t announce itself until the moment you need to exit.
How Volume in Investing Fits Into Our Three Categories
Volume in investing is not a valuation metric – it doesn’t tell you whether a stock is cheap or expensive. But it’s a practical consideration that affects how easily and fairly you can implement any investment decision.
In Fortress, we work primarily with broad ETFs and index funds – which are among the most liquid securities available. Major ETFs like those tracking the S&P 500 or MSCI World trade billions of euros in volume daily. Liquidity is essentially a non-issue here. You buy and sell at the price you see, whenever you choose, without any meaningful slippage.
In Cash Flow, the dividend stocks and REITs we evaluate are generally large, established companies with healthy daily volume. Liquidity is rarely a concern – but it’s always worth confirming before investing in smaller or more niche income-generating stocks.
In High Voltage, volume in investing becomes a more active consideration. Some of our picks are smaller, higher-growth companies where daily volume can be lower. We always note this when it’s relevant – because a High Voltage pick with thin volume carries an additional layer of risk that valuation metrics alone won’t reveal. The potential return may justify it. But the investor deserves to know it exists.
Not blind trust. Informed choice.
What to Look For When You See Volume in Investing on a Screener
When volume in investing appears in your research, use this simple framework:
What is the average daily volume? As a rough guide – below 100,000 shares per day signals potential liquidity concerns for most retail investors. Above 500,000 is generally comfortable. Above 1 million is highly liquid.
Is today’s volume significantly above or below average? A volume spike – especially without obvious news – is worth investigating. A volume drought on a normally active stock can also be meaningful.
What is the bid-ask spread? Particularly for lower-volume stocks – check the difference between what buyers are offering and what sellers are asking. A wide spread is a direct cost of low liquidity.
Does the volume pattern match the price movement? Rising price with rising volume is stronger than rising price with falling volume. Use this to add context to any price move you’re trying to interpret.
For smaller companies – can you exit comfortably if you need to? Calculate roughly how many days it would take to sell your position without significantly affecting the price. If the answer is more than a day or two, factor that into your risk assessment.
For a complete guide to evaluating investments and understanding market dynamics, our Stocks Explained guide covers everything you need. 👉 Get the Stocks Explained Guide Here
Nothing in this article constitutes financial advice. All content is for informational and educational purposes only. Always do your own research before making any investment decision.
