Long & short: what are we really talking about?

Updated March 30, 2026 - The vocabulary of the stock market reserves traps for uninformed savers. Among the most misunderstood expressions, the pair long and short investment comes out on top. Many people confuse short positions with pure speculation, although it is above all a matter of working logic. Understanding this distinction is essential for anyone wanting to build an informed investment strategy in 2026.

Quick answer: in investing, being long means owning an asset by betting on its rise. To be short is to bet on its decline, generally through short selling or derivative instruments. Long and short investment designates an approach combining both directions to seek performance while controlling overall risk.

A long position represents the simplest and most common case. You buy a stock, bond, fund or other asset with the expectation that it will increase in value.

Basic mechanism#

The reasoning is in one sentence: you buy today to sell for more tomorrow. If the price increases from €100 to €120, you realize a gain of €20 per security (before fees and taxes).

This mechanism applies to most media accessible to individuals:

• shares listed on the stock exchange (Euronext Paris, NASDAQ, etc.);
• ETF (trackers) replicating an index;
• government or corporate bonds;
• SCPI or OPCI shares;
• raw materials via ETC.

Risk of a long position#

The maximum risk of a long position is limited to the amount invested. If the stock falls to zero, you lose your stake, but never again. This favorable asymmetry explains why the long term remains the cornerstone of any asset allocation.

To complete your reading, consult PEA-PME: what taxation for your investments?, Livret P: is it a good investment in the face of inflation? and Tax options for individuals 2026.

The short position reverses the logic. Instead of buying then reselling, you first sell an asset you don't own, with the intention of buying it back later at a lower price.

How does short selling work?#

The mechanism is broken down into three stages:

1. Security borrowing - Your intermediary lends you the shares (or borrows them from you on the market);
2. Immediate sale - You sell these securities at the daily rate, for example €50 per unit;
3. Later redemption - If the price falls to €40, you buy back and return the securities. Your gross gain is €10 per title.

If the price rises to €60 instead of falling, you must buy back at a higher price: the loss is €10 per security. And since a price can theoretically rise indefinitely, the potential loss of a short position is unlimited.

Is short selling legal in France?#

Yes, but it is strictly regulated. The Autorite des marches financiers (AMF) imposes reporting obligations for significant short positions on listed shares. Since the European regulation on short sales (EU Regulation No. 236/2012), any short position exceeding 0.2% of the capital of a listed company must be notified to the AMF. The public publication threshold is set at 0.5%.

The AMF regularly publishes the list of short positions notified on its site [where to find short positions] (https://www.amf-france.org/fr/ou-trouver-les-positions-courtes). It also provides a data visualization tool to monitor the evolution of these positions.

In 2025, the AMF has repeatedly reminded that short sales could be temporarily prohibited in periods of high instability, as was the case during the health crisis of 2020. This possibility of suspension constitutes an additional risk to include in your thinking.

Why do institutional investors use shorts?#

Investment funds and hedge funds use shorting for several legitimate reasons:

• Hedging - protect a long portfolio against a general market decline;
• Arbitrage - exploiting temporary price differences between correlated assets;
• Expression of bearish conviction - monetizing a negative analysis on a company or sector.

For an individual, the logic of coverage is the only one that is really justified from a heritage perspective.

A long and short investment strategy is not simply betting in either direction at random. It is based on a thoughtful construction.

The components of a long portfolio/short#

A typical long/short fund combines:

• A long basket - assets selected for their appreciation potential;
• A short basket - assets deemed overvalued or fragile;
• An exposure ratio - the ratio between long exposure and short exposure determines the directional bias of the portfolio;
• A hedging logic - shorts can be used to neutralize market risk (neutral beta) or to protect the long portfolio in periods of turbulence.

The différent approaches long/short#

What performance can we expect from a long/short fund?#

Historically, European long/short equity funds display lower volatility than pure stocks, but also a more moderate average performance. The interest lies in the partial decorrelation with the equity markets, which can improve the return ratio/risque of an overall portfolio.

Hayot Expertise Advice: if you do not clearly understand how the "short" part produces a gain or loss in a financial product, it is better to consider that the product is too complex at this stage. This common sense rule will save you many disappointments.

The risks of shorting go well beyond simple volatility. Every saver must measure them before committing.

Unlimited risk of loss#

Unlike long where the maximum loss is capped at the bet, short is exposed to theoretically infinite losses. A €5 title can go up to €50, €100 or more. Each euro increase translates into a dead loss for the short seller.

The short squeeze: a classic trap#

A short squeeze occurs when a heavily shorted stock begins to rise. Short sellers must buy back urgently to limit their losses, which fuels the rise and forces other shorts to cover. The snowball effect can be spectacular.

The most famous example remains that of GameStop in January 2021, where coordinated individual investors caused a massive squeeze. In 2026, this phenomenon remains relevant for certain stocks with high short interest rates, particularly in the technology and biotech sectors.

Cost of borrowing and margin calls#

Borrowing a title is not free. The borrowing rate varies depending on the rarity of the security and can reach several tens of percent annually on names that are difficult to borrow. In addition, your broker may ask you for margin calls if the position develops unfavorably, forcing you to inject cash or face forced liquidation.

Risk of suspension of short sales#

The AMF has the power to temporarily prohibit short sales on certain securities or on the entire market during periods of crisis. If you hold a short position at the time of such a suspension, you will not be able to close it, which may worsen your losses if the market rebounds.

French individuals have several ways to take a short exposure, each with its own specificities.

Derivatives traded on the stock exchange#

• Turbos and certificates - Structured products issued by banking establishments, accessible via a securities account or a PEA (for some). They offer built-in leverage;
• Put options - Give the right to sell an asset at a determined price. The maximum loss is limited to the premium paid;
• Futures contracts - Firm commitments to buy or sell at a future date. Reserved for sophisticated investors due to leverage.

Inverse ETFs (short ETFs)#

These listed funds replicate the inverse of the performance of an index. A short CAC 40 ETF rises when the CAC 40 falls, and vice versa. Some offer x2 or x3 inverse leverage. Please note: these products are designed for daily use and suffer from composition bias in the medium term.

Concretely, if the CAC 40 is +5% one day then -5% the next day, a daily short ETF will not return to its initial level. This mathematical effect, called "volatility drag", is often misunderstood by savers.

Direct short sale#

Possible on an ordinary securities account, provided that your broker offers the securities lending service. Conditions vary greatly from one establishment to another. Not all securities are borrowable, and borrowing rates may fluctuate daily.

In France, capital gains made on both long and short positions are subject to the flat tax régime (single flat-rate levy) of 30% (12.8% tax + 17.2% social security contributions), unless there is an option for the progressive income tax scale.

Losses realized on short positions are déductible from capital gains of the same nature within the limit of 10 years. This tax symmetry is important to integrate into your net profitability calculation.

Derivative instruments and short ETFs follow the same general tax régime. The complexity lies more in the calculation of the added value than in the rate itself. Each transaction must be declared individually, which can represent a significant administrative volume for an active portfolio.

Point of vigilance: the taxation of derivative products may vary depending on their legal classification (over-the-counter futures contract, negotiated option, etc.). Prior tax advice is recommended before getting started.

The question is not whether the shorts are "good" or "bad". It is to determine whether this instrument corresponds to your profile, your horizon and your risk tolerance.

Questions to ask yourself before taking a short position#

• What is my objective: hedging, speculation or arbitrage?
• What is my maximum acceptable loss?
• Do I have the necessary liquidity to meet a margin call?
• Do I understand the product I am buying or selling?
• What will be the tax impact on my personal situation?

When shorts make sense in a wealth strategy#

Shorts find their place as a hedging tool in a diversified portfolio. For example, a manager whose wealth is concentrated in stocks in his sector can use a sector short position to mitigate the risk of correction. But this requires active monitoring and a detailed understanding of the mechanisms at play.

For the vast majority of savers, the most reasonable approach remains a diversified long-term allocation, possibly supplemented by long/short funds professionally managed via life insurance.

We can help you bring support, horizon, risk and tax framework into consistency before any asset decision.

Quick link: Take stock of your wealth strategy

The vocabulary long and short investment may seem technical, but the issue is simple: understand whether you are buying an increase, a decrease or a combination of the two, and at what level of risk. The long position remains the basis of any wealth strategy. Shorts are a powerful but dangerous tool in inexperienced hands.

(Official sources: AMF - Regulations on short sales, Where to find short positions, Data visualization of short sales)