Comprendre n’est pas trader : la voie recommandée du parcours reste l’investissement régulier de long terme. Mais savoir comment un ordre s’exécute évite les mauvaises surprises le jour où tu cliques.
Last editorial review: . Informative content, reviewed periodically; figures are indicative and not contractual — always check the current terms with the partner.
La mécanique d’exécution
Ce qui se passe quand tu cliques sur « acheter »
Acheter ou vendre en Bourse comme sur une plateforme crypto passe toujours par un ordre — et son type change tout : prix maîtrisé ou subi, exécution garantie ou non. Les fiches détaillées de chaque type d’ordre sont sur la page dédiée ; ici, on regarde la mécanique.
Trois notions suffisent pour comprendre pourquoi le prix obtenu n’est pas toujours celui affiché — et pourquoi la How easily an asset can be bought or sold quickly without moving its price. A liquid market shows a narrow spread; on an illiquid asset, a market order can be executed at a price far removed from the one displayed (slippage). See it in the glossary d’un actif change tout. Schéma purement pédagogique : aucune valeur réelle, aucun prix — une illustration, pas une cotation.
1The real-time list of pending buy orders (bids) and sell orders (asks) on an asset, ranked by price level with their quantities. It is the meeting of these two columns that forms the price — and its “depth” measures the liquidity available. See it in the glossary
Achats (bids)
N1
N2
N3
Ventes (asks)
N1
N2
N3
Deux colonnes face à face : les acheteurs (bids) d’un côté, les vendeurs (asks) de l’autre, empilés par niveau de prix avec leurs quantités. C’est leur rencontre qui fait le prix — et la « profondeur » de chaque niveau, la liquidité disponible.
2The gap between the best buying price and the best selling price of an asset. It is an implicit cost paid on every transaction: narrow on liquid assets, it widens on thinly traded markets. See it in the glossary
Meilleur achat← spread →l’écartMeilleure vente
L’écart entre la meilleure demande et la meilleure offre. C’est un coût implicite payé à chaque aller-retour : étroit sur un actif liquide, il se creuse dès que le marché s’assèche.
3The gap between the price expected when placing an order — especially a market order — and the price actually obtained. It comes from a lack of liquidity or from fast-moving prices; a limit order protects against it by fixing your price. See it in the glossary
Prix espéré
Prix obtenu← glissement
L’écart entre le prix attendu et le prix réellement obtenu — surtout avec un ordre au marché : quand la liquidité manque ou que le cours bouge vite, l’exécution « glisse » au-delà du niveau affiché.
Illustration symbolique : les barres figurent des quantités relatives, aucun prix réel n’est représenté.
Jargon decoded :The real-time list of pending buy orders (bids) and sell orders (asks) on an asset, ranked by price level with their quantities. It is the meeting of these two columns that forms the price — and its “depth” measures the liquidity available. See it in the glossary · The gap between the best buying price and the best selling price of an asset. It is an implicit cost paid on every transaction: narrow on liquid assets, it widens on thinly traded markets. See it in the glossary · The gap between the price expected when placing an order — especially a market order — and the price actually obtained. It comes from a lack of liquidity or from fast-moving prices; a limit order protects against it by fixing your price. See it in the glossary · How easily an asset can be bought or sold quickly without moving its price. A liquid market shows a narrow spread; on an illiquid asset, a market order can be executed at a price far removed from the one displayed (slippage). See it in the glossary · Two roles facing the order book: a “maker” order rests in the book and provides liquidity (a limit order not executed straight away); a “taker” order consumes the existing liquidity (a market order, in particular). Many platforms charge different fees depending on the role played. See it in the glossary
Spot ou levier
Au comptant (spot) ou avec levier : la différence qui change tout
Derrière chaque bouton « acheter », deux mondes très différents. Au comptant, tu achètes l’actif lui-même ; avec les produits dérivés à levier, tu prends une exposition amplifiée — et le risque change de nature. Comprendre la frontière est indispensable avant même de toucher une plateforme.
Buying or selling “for cash”: you become the direct owner of the asset, with immediate settlement. Any loss is capped at your stake — unlike leveraged derivatives — which makes it the suitable mode for beginners. See it in the glossary : tu possèdes ce que tu achètes
Tu deviens réellement propriétaire de l’actif, avec un règlement immédiat : l’action ou le jeton est à toi.
La détention peut produire des fruits : un The share of profits a company pays out to its shareholders. Payment is never guaranteed and may be reduced or suspended depending on the company’s results. See it in the glossary en Bourse (jamais garanti), ou du Locking up cryptocurrencies to take part in securing a network (proof of stake), in exchange for a reward. It pays you for holding, but exposes you to the risk of being locked in and of the price falling. See it in the glossary en crypto — les récompenses restent conservées chez la plateforme tant que tu ne les retires pas.
Perte plafonnée à la mise : un avoir au comptant peut perdre de la valeur, mais il ne passe pas sous zéro.
C’est le mode adapté au débutant — et celui que suppose tout le reste de ce parcours.
Dérivés & The technique of investing with borrowed money (or through derivatives) in order to amplify exposure. It multiplies potential gains as well as losses, which can exceed the initial stake. See it in the glossary : une exposition amplifiée, un risque changé de nature
En crypto, le Buying or selling with money borrowed from the platform, by posting collateral (the margin): exposure exceeds the stake, and losses can exceed it too. Below a certain margin level, the position is liquidated automatically — a mode for experienced investors only. See it in the glossary et les A derivative contract that tracks the price of an asset without holding it, generally used with leverage; the “perpetual” versions offered by crypto platforms have no maturity and rely on a funding rate. Gains and losses are amplified and automatic liquidation is possible: for experienced investors only. See it in the glossary combinent un collatéral et un emprunt : la position dépasse la mise, et gains comme pertes sont amplifiés.
Un future est un contrat qui suit le prix — tu ne détiens pas l’actif ; les perpétuels ajoutent un On crypto perpetual contracts, a periodic exchange between long and short positions, designed to keep the contract price close to that of the underlying asset. Its direction and size vary constantly: it can cost you as well as pay you, and it adds to the risks inherent in leverage. See it in the glossary périodique qui peut coûter comme rapporter.
Sous la marge de maintenance : The forced closing of a leveraged position by the platform, when the margin posted is no longer enough to cover the losses. It can wipe out the entire margin committed — this is the central risk of margin trading and futures, with no equivalent on the spot market. See it in the glossary — tu peux perdre toute la marge, voire plus que ta mise en margin. La marge isolée cantonne la perte à la position ; la marge croisée engage tout le compte.
En Bourse française, le A service of the Paris stock exchange that allows you, on certain liquid securities, to buy with leverage or sell short while settling only at the end of the month, in exchange for a carrying cost. Reserved for the securities account: the SRD does not exist inside the PEA. See it in the glossary offre du levier sur certaines valeurs liquides (règlement en fin de mois, coût en intérêts) et permet la Selling a security you do not own (borrowed), betting on its fall in order to buy it back cheaper later. If the price rises, the potential loss is in theory unlimited: a speculative technique for experienced investors, available in France notably through the SRD on a securities account. See it in the glossary. Il est réservé au compte-titres : le SRD n’existe pas dans un PEA — pas de levier ni de vente à découvert en PEA (hors ETF à levier, eux-mêmes très particuliers).
Jargon decoded :Buying or selling “for cash”: you become the direct owner of the asset, with immediate settlement. Any loss is capped at your stake — unlike leveraged derivatives — which makes it the suitable mode for beginners. See it in the glossary · The technique of investing with borrowed money (or through derivatives) in order to amplify exposure. It multiplies potential gains as well as losses, which can exceed the initial stake. See it in the glossary · A derivative contract that tracks the price of an asset without holding it, generally used with leverage; the “perpetual” versions offered by crypto platforms have no maturity and rely on a funding rate. Gains and losses are amplified and automatic liquidation is possible: for experienced investors only. See it in the glossary · Buying or selling with money borrowed from the platform, by posting collateral (the margin): exposure exceeds the stake, and losses can exceed it too. Below a certain margin level, the position is liquidated automatically — a mode for experienced investors only. See it in the glossary · The forced closing of a leveraged position by the platform, when the margin posted is no longer enough to cover the losses. It can wipe out the entire margin committed — this is the central risk of margin trading and futures, with no equivalent on the spot market. See it in the glossary · On crypto perpetual contracts, a periodic exchange between long and short positions, designed to keep the contract price close to that of the underlying asset. Its direction and size vary constantly: it can cost you as well as pay you, and it adds to the risks inherent in leverage. See it in the glossary · A service of the Paris stock exchange that allows you, on certain liquid securities, to buy with leverage or sell short while settling only at the end of the month, in exchange for a carrying cost. Reserved for the securities account: the SRD does not exist inside the PEA. See it in the glossary · Selling a security you do not own (borrowed), betting on its fall in order to buy it back cheaper later. If the price rises, the potential loss is in theory unlimited: a speculative technique for experienced investors, available in France notably through the SRD on a securities account. See it in the glossary
Ta première fois : passer ton premier ordreLe chemin, écran après écran — pour que rien ne te surprenne.DéroulerReplier
Situation inventée, à visée pédagogique
Imaginons ta toute première fois, une fois ton support choisi et ton compte ouvert. Voici le chemin, écran après écran — pour que rien ne te surprenne le jour où tu passeras (peut-être) le pas.
1
Retrouver le bon support (son code ISIN)
Sur la fiche de ton courtier, tu cherches le produit par son nom… puis tu vérifies surtout son identifiant unique, l’ISIN — deux lettres de pays suivies d’une série de caractères. C’est lui qui lève toute ambiguïté entre deux lignes au nom presque identique.
Deux ETF « Monde » peuvent porter des noms très proches : l’ISIN, lui, ne trompe pas.
2
Vérifier l’éligibilité à ton enveloppe
Avant de valider quoi que ce soit, tu regardes si le support est éligible à l’enveloppe que tu utilises (PEA, compte-titres, assurance-vie). Un même produit n’est pas toujours logeable partout, et l’enveloppe change la fiscalité selon les règles en vigueur.
Si le support n’est pas éligible à ton PEA, l’interface te le refusera — mieux vaut le savoir avant de t’y attacher.
3
Choisir la quantité (dans le budget décidé d’avance)
Tu indiques combien de parts tu veux, et l’écran affiche le montant estimé correspondant. Tu t’en tiens au budget que tu avais fixé avant d’ouvrir la page — jamais un montant décidé sous le coup de l’élan.
Certains courtiers permettent d’investir un montant fixe plutôt qu’un nombre de parts : les deux reviennent au même repère, ton budget.
4
Choisir le type d’ordre
C’est ici que les fiches ci-dessus servent : un ordre au marché pour une exécution immédiate au prix subi, ou un ordre à cours limité pour fixer toi-même ton prix. Pour un débutant, surtout sur un actif peu liquide, l’ordre limité garde la main sur le prix.
Un doute sur le bon type ? Remonte aux « 3 ordres de base » de cette section : c’est exactement le moment où ils servent.
5
Relire le récapitulatif avant de valider
Un écran de confirmation résume tout : le support, l’enveloppe, la quantité, le type d’ordre et les frais annoncés. Tu relis chaque ligne, tranquillement — c’est le dernier moment pour corriger une erreur de saisie.
Hésiter au moment de valider n’est pas un défaut : c’est le bon réflexe. Rien ne presse, un ordre non passé ne coûte rien.
6
Retrouver ton avis d’opéré
Une fois l’ordre exécuté, ton courtier édite un avis d’opéré : la trace écrite de l’opération (support, quantité, prix d’exécution, frais). Tu le retrouves dans l’historique de ton compte et tu le conserves — utile pour ton suivi comme pour ta déclaration.
Si l’ordre n’est exécuté qu’en partie, l’avis le précise : le reliquat peut rester en attente selon la durée de validité que tu as choisie.
Jargon decoded :An order executed immediately at the best price available in the book, with no price limit (the former “à tout prix” order on Euronext). Fast and given priority, but with no price guarantee: on an illiquid asset it can “sweep” several levels and execute far further away than expected (slippage). See it in the glossary · An order carrying a maximum price when buying (or a minimum when selling): it executes at that price or better, never beyond. You control your price, but execution is not guaranteed — the order may remain partly or entirely unfilled. See it in the glossary · An order without a price that executes against the best bid (or offer) present in the book when it arrives; the unfilled part stays pending at that same price. On Euronext, this is the former “au prix du marché” order. See it in the glossary · A “trigger threshold” order: when the price crosses the threshold you chose, a market order is sent — typically to cut a loss automatically. The trigger is guaranteed, the price is not: in a sharp drop, execution can happen well beyond the threshold. See it in the glossary · An order combining a trigger threshold and a limit price: when the threshold is crossed, it is a limit order that is placed (“à plage de déclenchement” in France). It protects against slippage, but if the price jumps straight through the range, the limit order may never execute — leaving the position exposed. See it in the glossary · An order that aims to secure a gain by selling automatically when the price reaches a target set in advance — on the French stock market, in practice a sell limit order placed above the current price (or an “expert order”, depending on the broker). Its limit version may never execute if the target is not reached. See it in the glossary · “One-Cancels-the-Other”: two orders placed at the same time — typically a limit take-profit and a stop — where the execution of one automatically cancels the other. It lets you frame a position in advance, on the upside as well as the downside; offered as an “expert order” by some French brokers only. See it in the glossary · A dynamic stop that follows the price at a set distance for as long as it moves in your favour, and triggers on the reversal. Not native on Euronext (some brokers simulate it on their side); setting the distance is delicate: too tight and you are taken out too early — too wide and you give a lot back. See it in the glossary · The parameter of an order that sets how long it stays active: day, until a chosen date, or good-till-cancelled (GTC) on the stock market; GTC, IOC (immediate-or-cancel) or FOK (fill-or-kill) on crypto platforms. Maximum durations vary by market and by broker. See it in the glossary · The real-time list of pending buy orders (bids) and sell orders (asks) on an asset, ranked by price level with their quantities. It is the meeting of these two columns that forms the price — and its “depth” measures the liquidity available. See it in the glossary · The gap between the best buying price and the best selling price of an asset. It is an implicit cost paid on every transaction: narrow on liquid assets, it widens on thinly traded markets. See it in the glossary · The gap between the price expected when placing an order — especially a market order — and the price actually obtained. It comes from a lack of liquidity or from fast-moving prices; a limit order protects against it by fixing your price. See it in the glossary · How easily an asset can be bought or sold quickly without moving its price. A liquid market shows a narrow spread; on an illiquid asset, a market order can be executed at a price far removed from the one displayed (slippage). See it in the glossary · Two roles facing the order book: a “maker” order rests in the book and provides liquidity (a limit order not executed straight away); a “taker” order consumes the existing liquidity (a market order, in particular). Many platforms charge different fees depending on the role played. See it in the glossary · Buying or selling “for cash”: you become the direct owner of the asset, with immediate settlement. Any loss is capped at your stake — unlike leveraged derivatives — which makes it the suitable mode for beginners. See it in the glossary · The technique of investing with borrowed money (or through derivatives) in order to amplify exposure. It multiplies potential gains as well as losses, which can exceed the initial stake. See it in the glossary · A derivative contract that tracks the price of an asset without holding it, generally used with leverage; the “perpetual” versions offered by crypto platforms have no maturity and rely on a funding rate. Gains and losses are amplified and automatic liquidation is possible: for experienced investors only. See it in the glossary · Buying or selling with money borrowed from the platform, by posting collateral (the margin): exposure exceeds the stake, and losses can exceed it too. Below a certain margin level, the position is liquidated automatically — a mode for experienced investors only. See it in the glossary · The forced closing of a leveraged position by the platform, when the margin posted is no longer enough to cover the losses. It can wipe out the entire margin committed — this is the central risk of margin trading and futures, with no equivalent on the spot market. See it in the glossary · A service of the Paris stock exchange that allows you, on certain liquid securities, to buy with leverage or sell short while settling only at the end of the month, in exchange for a carrying cost. Reserved for the securities account: the SRD does not exist inside the PEA. See it in the glossary · Selling a security you do not own (borrowed), betting on its fall in order to buy it back cheaper later. If the price rises, the potential loss is in theory unlimited: a speculative technique for experienced investors, available in France notably through the SRD on a securities account. See it in the glossary · On crypto perpetual contracts, a periodic exchange between long and short positions, designed to keep the contract price close to that of the underlying asset. Its direction and size vary constantly: it can cost you as well as pay you, and it adds to the risks inherent in leverage. See it in the glossary
La suite
Comprendre les boutons, puis choisir chez qui les toucher
Un ordre s’exécute chez un courtier, et deux courtiers ne facturent pas la même chose pour le même ordre : c’est la seule variable que tu maîtrises vraiment. La mécanique d’exécution, elle, ne remplace pas la méthode.
Contenus pédagogiques à visée d’information générale — ils ne constituent pas un conseil en investissement et ne sont en aucun cas une incitation à trader. Les produits à effet de levier exposent à une perte supérieure au montant investi.
