By Benjamin Roure L'Hermitte
A stock is a security that gives its holder a share of ownership in a company, and trading stocks means buying and selling those shares on an exchange to try to profit from their price movements, over a horizon often much shorter than a classic investor's. It's a market you hear about every day, but confusing stock trading with stock investing leads to costly mistakes. Understanding stock trading starts with what a share really represents, how this market works, and what sets trading apart from investing.
- A share is a piece of ownership in a company, listed and traded on an exchange.
- Trading differs from investing: shorter horizon, technical approach, more frequent turnover.
- An earnings release can create a price gap, and a stop order then guarantees no execution price.
- In the US, the $25,000 rule on day trading stocks has been replaced since June 4, 2026 by an intraday margin standard, which brokers are phasing in.
The stock market has a feature few other markets share: every ticker represents a real company, with quarterly results, announcements, management, its own news flow. This fundamental dimension adds a layer that isn't found the same way in forex or crypto, where macro or technical analysis often dominates alone.
This guide reviews what a share concretely is, how exchange hours work, what separates trading from investing, how to read a stock chart, how to handle gaps around earnings, the main order types, and what US regulation requires of day trading in stocks.
What a share represents
A share is a piece of ownership in a company: the SEC's guide to stocks, from the US markets regulator, defines stocks as a type of security that gives stockholders a share of ownership in a company. When a company goes public (an operation called an IPO), it opens up its capital, divided into a large number of shares, which can then be bought and sold by the public on an exchange. Holding a share, even in tiny quantity, makes you a co-owner of that company, with two main rights recalled by the AMF's page on investing in listed shares, from the French regulator: voting at the shareholder meeting, and receiving the portion of profit the company distributes, the dividend. Nothing obliges a company to pay one: the SEC notes that growth stocks rarely pay dividends. And if the company goes bankrupt, common stockholders are last in line, after bondholders, and may get nothing.
A share's price theoretically reflects the market's perceived value of the company: the AMF explains that the price varies with investors' expectations about how the company's earnings will evolve. In practice, over the short term, the price is also influenced by far more volatile factors: overall market sentiment, order flow, macroeconomic news, and sometimes simple technical moves with no direct link to the company's fundamentals. It's this tension between fundamental value and short-term price movement that structures the whole difference between investing and trading.
Exchanges and market hours
Unlike forex, the stock market isn't open continuously: each exchange has its own hours. In New York, the core trading session runs from 9:30 a.m. to 4:00 p.m. Eastern Time, according to the NYSE trading hours. Trading also happens before and after, in pre-market and after-hours sessions: the SEC's definition of after-hours trading notes that the duration of these sessions varies between markets and trading venues. In Paris, according to the trading hours published by Euronext, shares trade continuously from 9:00 to 17:30 Central European Time, followed by a closing auction at 17:35. A stock listed in London or Tokyo follows its own exchange's hours. The detail of US sessions, holidays included, is on our page about stock market hours.
This fixed-hours structure fundamentally changes the approach compared to forex: there's a genuine open and a genuine close every day, and whatever happens between two sessions (a release, a piece of news) lands all at once in the next day's first price. Understanding trading stocks means knowing this daily rhythm specific to each exchange, one of the basics to absorb before going active.
Trading stocks vs investing in stocks
Confusing trading with investing leads to misaligned expectations and behavior. Investing means buying a share betting on its long-term valuation, often over several years, relying mainly on fundamental analysis of the company: its earnings, its debt, its sector, its management. The investor rides out short-term fluctuations without reacting, and should expect them: according to the SEC, large company stocks as a group have lost money on average about one out of every three years, and the AMF recommends a horizon of at least five years for a diversified stock portfolio. Past performance guarantees nothing about the future.
Trading stocks targets a much shorter horizon, from a few minutes to a few weeks, and relies more on technical analysis: price structure, volume, momentum, key levels. The trader doesn't necessarily have an opinion on the company's long-term value; they're seeking to profit from an identifiable price move within a short time window. These two approaches require different skills, tools and psychology, and mixing them unknowingly (for example holding a losing trade while convincing yourself you're now 'investing') exposes you to unmanaged losses. That leaning has been measured: across 10,000 accounts at a US discount broker tracked from 1987 through 1993, Terrance Odean's study on the reluctance to realize losses shows these investors sold their winning positions more readily than their losing ones.
Frequent round trips also have a cost. In Barber and Odean's study, 'Trading Is Hazardous to Your Wealth', covering 66,465 households with accounts at a US discount broker from 1991 to 1996, the households that traded most earned 11.4% a year net of costs, against 18.5% for those that traded least, while their gross returns were almost identical. The study measures US individuals holding stocks directly over that period, not today's day traders, but it is a reminder of something simple: every order has a cost, and it comes out of the result.
How to read stock charts
Since stock trading leans on price, you need to know how to read a stock chart. The horizontal axis carries time, the vertical axis carries price, and each point, bar or candle sums up one period: a day on a daily chart, a week on a weekly chart, a few minutes intraday. The 'What Are Charts?' page of StockCharts' ChartSchool puts it this way: the less compressed the data, the more detail the chart shows, and the more noise it contains too.
One format that has become very popular is the candlestick. Each candle is built from four prices: the open, the high, the low and the close. The rectangle, called the body, links the open to the close, and the thin lines above and below, the shadows or wicks, reach the period's high and low, as described in ChartSchool's introduction to candlesticks. The color or fill of the body tells you whether the stock closed above or below its open. On a stock's daily chart, a gap shows at a glance: an empty space between the previous day's candle and the current one.
Below the price, vertical bars show volume, meaning the quantity of shares traded during the period; ChartSchool's lesson on scaling and volume shows this layout, with bars colored according to whether the session finished up or down. Finally, look at the price scale. On an arithmetic scale, 10 dollars always takes up the same height; on a logarithmic scale, the same percentage takes up the same height, so a rise from 10 to 20 and a rise from 40 to 80 look the same size. On a chart covering several years, for a stock whose price has changed a lot, the two scales don't tell the same story.
Quarterly earnings and gaps
A striking phenomenon in stocks is the gap around earnings releases. In the US, a listed company files a quarterly report (Form 10-Q) for each of the first three quarters of its fiscal year, then an annual report, as explained in the SEC's entry on Form 10-Q. In France, the obligation covers an annual report and a half-yearly report; quarterly publication is no longer mandatory, and each company decides whether to make one, according to the AMF's guide to periodic information for listed companies. When a release lands outside trading hours, the stock's price can adjust sharply at the next open, with no trades happening between the previous close and the new open. This price jump, the gap, can amount to several percent at once. Traders who play that first move use the gap and go strategy.
These gaps make certain practices particularly risky, like holding a position open through an earnings announcement without realizing it: a normally placed stop doesn't protect against a gap, since the price can jump straight past it. The SEC's investor bulletin on stop orders says it plainly: the stop price is not a guaranteed execution price, it is a trigger that turns the order into a market order, and the price you get can deviate significantly from it. Knowing the earnings calendar of the stocks you trade, and adjusting your position size or closing positions ahead of an announcement if you don't want to take that risk, is part of basic risk management in this market. Tagging these trades separately in your stock trading journal then lets you judge their result apart from your technical trades.
| Order type | How it works | Typical use |
|---|---|---|
| Market order | Executes immediately at the best available price | Enter or exit fast, without price control |
| Limit order | Executes only at a chosen price or better | Precisely control entry or exit price |
| Stop order | Triggers as a market order once a level is reached | Cap a loss or trigger an entry |
| Stop-limit | Triggers as a limit order once a level is reached | Control the execution price, at the risk of the order not being executed |
These definitions follow the SEC's page on types of orders: a market order guarantees execution but not the price, and a limit order only executes at the set price or better, so not at all if the market moves away from it. In France, the AMF presents limit orders and market orders as the most common. Not every broker offers every order type, and their rules for triggering a stop differ: check your own broker's.
Trailing stops, linked orders (OCO) and how long an order stays valid have their own guide: order types.
Sector rotation: a phenomenon specific to stocks
Stocks group into sectors (technology, energy, healthcare, finance, consumer) that don't all react the same way to the same macroeconomic conditions. The classic line of reasoning is about interest rates: a rise makes the financing growth stocks depend on more expensive, while banks can gain on their lending margins. It's a line of reasoning, not a law, and it doesn't hold in every cycle. This movement, where money shifts from one sector to another depending on the economic context, is called sector rotation.
Spotting a sector rotation in progress can reveal opportunities that stock-by-stock analysis doesn't always show: when an entire sector starts to outperform the broader market, the move no longer hinges on one company's news. Following macroeconomic news and its sector-level translation is a skill a stock trader develops over time, complementing pure technical analysis.
An illustrative gap example
Imagine a trader holding a long position on a stock trading at 50, with a stop placed at 47 to cap the loss at 3. The company reports disappointing earnings after the close, and the stock opens the next day at 42, well below the stop. The stop order triggers, but executes at the first available price after the open, around 42, not at 47 as planned: the actual loss is 8, more than double what was planned.
This illustrative example shows why a classic stop doesn't protect against a gap: it guarantees a trigger, not an execution price. That's precisely why you may choose to reduce your size or exit ahead of a known upcoming earnings release, rather than counting on a stop to limit the damage in a scenario where the market can jump several percent at once.
Day trading stocks in the US: the $25,000 rule and what replaces it
Day trading stocks was long subject, in the US, to a rule known as the Pattern Day Trader (PDT) rule. It designated as a 'pattern day trader' any margin account customer who executed four or more day trades within five business days, and required them to keep at least $25,000 in the account, as summarized in the SEC's entry on the pattern day trader. That rule is on its way out: FINRA's Regulatory Notice 26-10 replaces the day trade count and the $25,000 minimum with an intraday margin standard, effective since June 4, 2026, which brokers have until October 20, 2027 to apply.
Until your broker has switched, the old rule may still apply to your account, and its policy is what counts. The rule only ever concerned margin accounts opened at US brokers: not a cash account, not a broker based outside the US, not forex or crypto. Traders it got in the way of went through a prop firm account, reduced their trade frequency to stay under the threshold, or turned to swing trading, holding positions for several days rather than closing them within the same session. The detail, before and after the reform, is in our article on the pattern day trader rule.
Large caps vs small caps
Not all stocks behave the same way against the same order volume, and a company's market capitalization (the total value of all its outstanding shares, or market cap) is a key factor in that difference. Stocks are in fact categorized by size: large-cap, mid-cap and small-cap, then microcap for the smallest, in the classification the SEC recalls. A large-cap stock, like one from the CAC 40 or the S&P 500, as a rule absorbs large order volumes without the price moving disproportionately, which translates into tight spreads. The CAC 40 itself selects its stocks on market capitalization and liquidity, according to the AMF's page on equity markets and indices.
A small-cap stock, conversely, can see its price move sharply on a relatively modest order volume, which creates both more opportunity for fast moves and more execution risk: a normal-sized order can push the price against you before even being fully filled, a phenomenon called slippage. Small caps attract traders seeking volatility, but they require even stricter risk management than large caps, with position sizes reduced accordingly and particular attention paid to available volume before entering a position. As for the very lowest priced stocks, penny stocks, the SEC describes them as highly speculative.
How Tradoshi helps you with stocks
Whether you day trade or swing trade stocks, Tradoshi centralizes your positions, automatically computes your statistics by ticker and by sector, and helps you spot whether your results vary depending on context (earnings, sector rotation) without having to cross-reference this data by hand.
- CSV import and broker sync to centralize your stock trades without manual re-entry.
- Statistics by sector and by ticker to see where your edge is strongest.
- Position size calculator to adapt your risk to each stock's own volatility.
- Economic calendar to spot upcoming earnings releases on your open positions.
Frequently asked questions
What is trading stocks?
Stock trading means buying and selling shares of publicly listed companies to try to profit from their price movements, over a generally short horizon (from a few minutes to a few weeks), relying mostly on technical analysis rather than the company's long-term fundamental value.
What's the difference between trading and investing in stocks?
Investing targets the long term, often several years, relying on fundamental analysis of the company (earnings, debt, sector). Trading targets a much shorter horizon and relies more on technical analysis: price structure, volume, momentum. Mixing the two approaches unknowingly exposes you to unmanaged losses.
Why do stocks have price gaps?
Between two sessions, the market is closed: when important news lands at that moment, an earnings release for example, the price can adjust sharply at the next open. That jump, the gap, isn't covered by a classic stop, which guarantees a trigger, not a precise execution price.
What is sector rotation?
It's the movement where money shifts from one stock market sector to another depending on the economic context, for example from growth stocks to the financial sector during rising interest rates. Spotting a rotation in progress can reveal opportunities that stock-by-stock analysis doesn't always show.
Do you need $25,000 to day trade stocks in the US?
That was the Pattern Day Trader rule: in a margin account at a US broker, four or more day trades within five business days required keeping at least $25,000. FINRA has replaced it with an intraday margin standard, effective since June 4, 2026, which brokers have until October 20, 2027 to apply. Until then, your broker's policy is what counts.
What are the main order types for stocks?
A market order executes immediately at the best available price. A limit order executes only at a chosen price or better. A stop order triggers as a market order once a level is reached, and a stop-limit triggers as a limit order, which gives more control over the price, at the risk of not being executed.
Why does market capitalization matter for a trader?
Because it directly influences liquidity and price stability. A large cap absorbs big order volumes without moving disproportionately, with tight spreads. A small cap moves more sharply on modest volume, which creates more opportunity but also more risk of slippage on execution.
How do you read stock graphs?
The horizontal axis carries time, the vertical axis carries price. On a candlestick chart, each candle sums up one period with four prices: open, high, low and close. The bars below the price show the volume traded, and the scale can be arithmetic (equal price distances) or logarithmic (equal percentage distances).