{"id":1012,"date":"2026-09-29T12:01:30","date_gmt":"2026-09-29T10:01:30","guid":{"rendered":"https:\/\/wegetfunded.com\/?p=1012"},"modified":"2026-10-01T21:49:43","modified_gmt":"2026-10-01T19:49:43","slug":"spread-bid-ask-da9baa","status":"publish","type":"post","link":"https:\/\/wegetfunded.com\/fr\/blog\/spread-bid-ask-da9baa\/","title":{"rendered":"Spread bid-ask sur CFD et Forex : comment ce co\u00fbt se forme et pourquoi il varie"},"content":{"rendered":"<p>Le spread bid-ask est l&rsquo;\u00e9cart entre le prix auquel vous pouvez acheter un instrument et celui auquel vous pouvez le vendre au m\u00eame instant. Ce n&rsquo;est pas une commission ajout\u00e9e apr\u00e8s coup : c&rsquo;est un co\u00fbt int\u00e9gr\u00e9 dans le prix lui-m\u00eame, pr\u00e9sent avant m\u00eame que la position ne bouge d&rsquo;un centime.<\/p>\n\n<h2>Ce que la SEC et le CME Group appellent bid et ask<\/h2>\n<p>Le r\u00e9gulateur am\u00e9ricain des march\u00e9s financiers d\u00e9finit le spread comme la diff\u00e9rence entre le prix le plus haut qu&rsquo;un teneur de march\u00e9 est pr\u00eat \u00e0 payer pour acheter un titre (le bid) et le prix le plus bas auquel il est pr\u00eat \u00e0 le vendre (l&rsquo;ask), sur un march\u00e9 de gr\u00e9 \u00e0 gr\u00e9 (<a href=\"https:\/\/www.sec.gov\/answers\/spread.htm\" rel=\"noopener\" target=\"_blank\">SEC, definition of Spread<\/a>).<\/p>\n<p>Le CME Group, qui organise des march\u00e9s \u00e0 carnet d&rsquo;ordres pour les contrats \u00e0 terme, retient une d\u00e9finition plus neutre, sans r\u00e9f\u00e9rence \u00e0 un teneur de march\u00e9 unique : le spread bid\/ask est simplement l&rsquo;\u00e9cart de prix entre le cours acheteur et le cours vendeur (<a href=\"https:\/\/www.cmegroup.com\/education\/glossary\" rel=\"noopener\" target=\"_blank\">CME Group, Glossary<\/a>). La nuance compte : sur un march\u00e9 organis\u00e9, l&rsquo;\u00e9cart r\u00e9sulte de la confrontation de multiples ordres dans un carnet public ; sur un march\u00e9 de gr\u00e9 \u00e0 gr\u00e9 comme le Forex ou les CFD, il refl\u00e8te le prix que propose le fournisseur de liquidit\u00e9 \u00e0 ce moment pr\u00e9cis.<\/p>\n\n<h2>L&rsquo;exemple chiffr\u00e9 de l&rsquo;AMF sur les CFD<\/h2>\n<p>L&rsquo;Autorit\u00e9 des march\u00e9s financiers illustre ce co\u00fbt avec un exemple concret : un CFD s&rsquo;ach\u00e8te 101 euros et se vend 99 euros au m\u00eame instant. Cet \u00e9cart de deux euros constitue les frais support\u00e9s par le client, ind\u00e9pendamment de la commission qui s&rsquo;applique en plus sur les CFD actions (<a href=\"https:\/\/www.amf-france.org\/fr\/espace-epargnants\/comprendre-les-produits-financiers\/produits-complexes\/cfd\" rel=\"noopener\" target=\"_blank\">AMF, Les CFD (contracts for difference)<\/a>).<\/p>\n<p>Concr\u00e8tement, si vous ouvrez et fermez imm\u00e9diatement une position sur cet instrument, sans que le march\u00e9 n&rsquo;ait boug\u00e9, vous perdez ces deux euros par unit\u00e9. Le spread se paie donc d\u00e8s l&rsquo;entr\u00e9e en position, avant tout mouvement de prix favorable ou d\u00e9favorable. C&rsquo;est un co\u00fbt structurel, pas un al\u00e9a.<\/p>\n\n<h2>Pourquoi le spread varie selon l&rsquo;instrument<\/h2>\n<p>Interactive Brokers rattache l&rsquo;ampleur du spread \u00e0 la liquidit\u00e9 de l&rsquo;actif concern\u00e9. Sur un actif tr\u00e8s liquide, comme une action \u00e0 grande capitalisation ou une paire de devises majeure, le spread est typiquement \u00e9troit. Sur un actif illiquide ou volatil, il peut \u00eatre significativement plus large (<a href=\"https:\/\/www.interactivebrokers.com\/campus\/glossary-terms\/bid-ask-spread\/\" rel=\"noopener\" target=\"_blank\">IBKR Campus, Bid-Ask Spread<\/a>).<\/p>\n<p>Cette relation avec la liquidit\u00e9 explique pourquoi un couple comme l&rsquo;EUR\/USD affiche g\u00e9n\u00e9ralement un \u00e9cart plus resserr\u00e9 qu&rsquo;une paire exotique ou qu&rsquo;un indice moins \u00e9chang\u00e9 : plus les acheteurs et les vendeurs sont nombreux \u00e0 un instant donn\u00e9, plus l&rsquo;\u00e9cart entre leurs prix a tendance \u00e0 se r\u00e9duire. \u00c0 l&rsquo;inverse, en dehors des heures de forte activit\u00e9, ou sur un instrument peu trait\u00e9, l&rsquo;\u00e9cart peut s&rsquo;\u00e9largir sans qu&rsquo;aucune annonce ne l&rsquo;explique.<\/p>\n\n<h2>Ce que cet \u00e9cart ne dit pas<\/h2>\n<p>Les sources mobilis\u00e9es ici d\u00e9finissent le m\u00e9canisme et donnent un ordre de grandeur illustratif, pas une r\u00e8gle de fr\u00e9quence ou d&rsquo;amplitude g\u00e9n\u00e9ralisable \u00e0 tous les instruments ou tous les horaires. Aucune des d\u00e9finitions cit\u00e9es n&rsquo;indique \u00e0 quel rythme un spread s&rsquo;\u00e9largit en pratique ni de combien, ces valeurs d\u00e9pendant du fournisseur de liquidit\u00e9 et du moment consid\u00e9r\u00e9. V\u00e9rifier les conditions de spread propres \u00e0 chaque instrument aupr\u00e8s du courtier reste donc n\u00e9cessaire avant d&rsquo;\u00e9valuer le co\u00fbt r\u00e9el d&rsquo;une strat\u00e9gie.<\/p>\n<p>Sur un compte de challenge, ce co\u00fbt s&rsquo;ajoute \u00e0 celui du <a href=\"https:\/\/wegetfunded.com\/fr\/blog\/financement-overnight-cfd-660651\/\">financement overnight sur CFD<\/a> lorsque la position est maintenue au-del\u00e0 d&rsquo;une journ\u00e9e, et il s&rsquo;articule diff\u00e9remment selon que l&rsquo;ordre pass\u00e9 est un <a href=\"https:\/\/wegetfunded.com\/fr\/blog\/ordre-limite-b3a761\/\">ordre limite<\/a> ou un <a href=\"https:\/\/wegetfunded.com\/fr\/blog\/ordre-stop-a11fec\/\">ordre stop<\/a>, le premier fixant un prix maximal d&rsquo;achat ou minimal de vente, le second d\u00e9clenchant un ordre au march\u00e9 une fois un seuil atteint.<\/p>\n\n<p>Pour situer ce co\u00fbt dans le cadre plus large des r\u00e8gles appliqu\u00e9es sur un compte financ\u00e9, le <a href=\"https:\/\/wegetfunded.com\/fr\/blog\/comparatif-prop-firms\/\">comparatif des prop firms en une phase<\/a> d\u00e9taille les r\u00e8gles de plusieurs offres c\u00f4te \u00e0 c\u00f4te.<\/p>\n\n\n<p class=\"wgf-meta wgf-byline wp-block-paragraph\">Quentin Belsack<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le spread bid-ask est l&rsquo;\u00e9cart entre le prix auquel vous pouvez acheter un instrument et celui auquel vous pouvez le vendre au m\u00eame instant. Ce n&rsquo;est pas une commission ajout\u00e9e apr\u00e8s coup : c&rsquo;est un co\u00fbt int\u00e9gr\u00e9 dans le prix lui-m\u00eame, pr\u00e9sent avant m\u00eame que la position ne bouge d&rsquo;un centime. Ce que la SEC [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1011,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_wgf_editorial_author":"quentin","_wgf_editorial_kind":"pedagogique","footnotes":""},"categories":[39],"tags":[],"class_list":["post-1012","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comprendre-le-trading"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Spread bid-ask : comment ce co\u00fbt se forme sur CFD et Forex<\/title>\n<meta name=\"description\" content=\"Le spread bid-ask est le co\u00fbt d&#039;\u00e9cart entre prix acheteur et vendeur sur CFD et Forex. 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D\u00e9finitions officielles et exemple chiffr\u00e9 de l'AMF.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/fr\\\/blog\\\/spread-bid-ask-da9baa\\\/#breadcrumb\"},\"inLanguage\":\"fr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/wegetfunded.com\\\/fr\\\/blog\\\/spread-bid-ask-da9baa\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr\",\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/fr\\\/blog\\\/spread-bid-ask-da9baa\\\/#primaryimage\",\"url\":\"https:\\\/\\\/wegetfunded.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/pedagogique-20260929-fr-cover.png\",\"contentUrl\":\"https:\\\/\\\/wegetfunded.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/pedagogique-20260929-fr-cover.png\",\"width\":2560,\"height\":1600,\"caption\":\"Illustration abstraite sombre de deux courbes lumineuses, l'une violette et l'une blanche, qui s'ecartent puis se resserrent entre des rochers, symbolisant les variations du spread bid-ask sur les marches financiers.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/fr\\\/blog\\\/spread-bid-ask-da9baa\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\\\/\\\/wegetfunded.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Spread bid-ask sur CFD et Forex : comment ce co\u00fbt se forme et pourquoi il varie\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/#website\",\"url\":\"https:\\\/\\\/wegetfunded.com\",\"name\":\"WeGetFunded\",\"publisher\":{\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/#organization\"},\"inLanguage\":[\"fr\",\"en\",\"es\",\"it\",\"de\"]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/#organization\",\"name\":\"WeGetFunded\",\"alternateName\":[\"We Get Funded\",\"WGF\"],\"legalName\":\"WeGetFunded LTD.\",\"url\":\"https:\\\/\\\/wegetfunded.com\",\"logo\":{\"@type\":\"ImageObject\",\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/#logo\",\"url\":\"https:\\\/\\\/wegetfunded.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/wgf-site-icon-512.png\",\"contentUrl\":\"https:\\\/\\\/wegetfunded.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/wgf-site-icon-512.png\",\"width\":512,\"height\":512,\"caption\":\"WeGetFunded\"},\"image\":{\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/#logo\"},\"sameAs\":[\"https:\\\/\\\/www.youtube.com\\\/@wegetfunded\",\"https:\\\/\\\/x.com\\\/wegetfunded\",\"https:\\\/\\\/discord.com\\\/invite\\\/rrcRVgq2J3\",\"https:\\\/\\\/play.google.com\\\/store\\\/apps\\\/details?id=com.wegetfunded.app\",\"https:\\\/\\\/instagram.com\\\/wegetfundedcom\",\"https:\\\/\\\/tiktok.com\\\/@wegetfunded\",\"https:\\\/\\\/facebook.com\\\/wegetfunded\",\"https:\\\/\\\/t.me\\\/wegetfunded\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/#\\\/schema\\\/person\\\/quentin-belsack\",\"name\":\"Quentin Belsack\",\"givenName\":\"Quentin\",\"familyName\":\"Belsack\",\"description\":\"Trader depuis 2021, Quentin Belsack pratique le scalping sur le Nasdaq 100 et anime les lives de trading de WeGetFunded.\",\"jobTitle\":\"Trader, animateur des lives de trading WeGetFunded\",\"knowsAbout\":[\"Trading\",\"Nasdaq 100\",\"Scalping\",\"Prop trading\"],\"worksFor\":{\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/#organization\"},\"sameAs\":[\"https:\\\/\\\/www.instagram.com\\\/qtn.bls\\\/\",\"https:\\\/\\\/www.tiktok.com\\\/@qtn.bls\"],\"url\":\"https:\\\/\\\/wegetfunded.com\\\/fr\\\/blog\\\/quentin-belsack\\\/\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\\\/\\\/wegetfunded.com\\\/#\\\/schema\\\/person\\\/quentin-belsack\\\/image\",\"url\":\"https:\\\/\\\/wegetfunded.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/quentin-belsack.webp\",\"contentUrl\":\"https:\\\/\\\/wegetfunded.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/quentin-belsack.webp\",\"caption\":\"Quentin Belsack\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Spread bid-ask : comment ce co\u00fbt se forme sur CFD et Forex","description":"Le spread bid-ask est le co\u00fbt d'\u00e9cart entre prix acheteur et vendeur sur CFD et Forex. 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