{"id":53327,"date":"2026-08-29T10:20:46","date_gmt":"2026-08-29T10:20:46","guid":{"rendered":"https:\/\/www.vtmarkets.com\/fr-eu\/uncategorized\/le-sp-500-subit-la-pression-saisonniere-de-septembre-le-support-a-7-638-met-7-120-au-centre-de-lattention\/"},"modified":"2026-08-29T10:20:46","modified_gmt":"2026-08-29T10:20:46","slug":"le-sp-500-subit-la-pression-saisonniere-de-septembre-le-support-a-7-638-met-7-120-au-centre-de-lattention","status":"publish","type":"post","link":"https:\/\/www.vtmarkets.com\/fr-eu\/live-updates\/le-sp-500-subit-la-pression-saisonniere-de-septembre-le-support-a-7-638-met-7-120-au-centre-de-lattention\/","title":{"rendered":"Le S&#038;P 500 subit la pression saisonni\u00e8re de septembre : le support \u00e0 7 638 met 7 120 au centre de l\u2019attention"},"content":{"rendered":"<p>Faiblesse saisonni\u00e8re et historique en septembre<\/p>\n<p>Les \u00e9tudes saisonni\u00e8res pr\u00e9sentent septembre comme le mois le plus faible pour le S&amp;P 500. Depuis 1928, l\u2019indice enregistre en moyenne environ -1,2 % en septembre et termine en baisse dans pr\u00e8s de 56 % des ann\u00e9es, ce qui en fait le seul mois affichant une moyenne de long terme n\u00e9gative. Une composition sur 98 ans, du 27 ao\u00fbt jusqu\u2019\u00e0 la fin d\u2019ann\u00e9e, montre typiquement un pic fin ao\u00fbt suivi d\u2019un repli tout au long de septembre jusqu\u2019au d\u00e9but octobre, tandis que la version sur 25 ans illustre une baisse plus marqu\u00e9e qui touche un point bas vers la fin du mois avant un rebond d\u2019octobre \u00e0 d\u00e9cembre. Pour 2026, ann\u00e9e d\u2019\u00e9lections de mi-mandat, la configuration historique ajoute de la pression : sur les 10 derniers mois de septembre d\u2019ann\u00e9es de mi-mandat, le S&amp;P 500 a recul\u00e9 six fois, pour une moyenne d\u2019environ -2 %, et depuis 1942 les ann\u00e9es de mi-mandat affichent aussi une moyenne n\u00e9gative en septembre, octobre constituant plus souvent le point d\u2019inflexion.<\/p>\n<p>Sur le graphique, un d\u00e9compte journali\u00e8re Elliott Wave baissier consid\u00e8re le sommet de mi-ao\u00fbt comme la vague 5 de W-3 et met en place W-4 sous la forme d\u2019une baisse a-b-c, la prochaine cassure vers le bas marquant la vague 3 de W-c. Une projection vise 7 121,85 via une vague c \u00e9gale \u00e0 1,68 fois la vague a, proche de la moyenne mobile simple \u00e0 200 jours autour de 7 119 ; une autre cartographie une s\u00e9quence en cinq vagues via 7 300\u20137 360 et 7 190, convergeant vers 7 100\u20137 200. Le niveau cl\u00e9 est 7 638 : au-dessus, une alternative haussi\u00e8re pourrait se r\u00e9affirmer en direction de ~7 940, mais une rupture s\u2019alignerait avec les donn\u00e9es de momentum \u2014 RSI(5) autour de 53, moyennes mobiles 10 et 20 jours autour de 7 689\u20137 712, et un MACD glissant avec histogramme n\u00e9gatif \u2014 en direction de 7 121\u20137 190.<\/p>\n<h3>Niveaux techniques critiques \u00e0 l\u2019approche de septembre 2026<\/h3>\n<p>Nous faisons face \u00e0 un mois historiquement brutal pour le march\u00e9 actions \u00e0 l\u2019approche de septembre 2026, et le S&amp;P 500 se trouve \u00e0 un carrefour critique. Actuellement autour du milieu des 7 600 points, l\u2019avenir imm\u00e9diat de l\u2019indice d\u00e9pend enti\u00e8rement de sa capacit\u00e9 \u00e0 pr\u00e9server son r\u00e9cent point bas hebdomadaire \u00e0 7 638. Si ce support cl\u00e9 c\u00e8de, nous anticipons une baisse rapide, port\u00e9e par la saisonnalit\u00e9, susceptible d\u2019entra\u00eener le march\u00e9 de plus de 6 % au cours des prochaines semaines.<\/p>\n<p>Historiquement, septembre est de loin le pire mois du calendrier pour les actions, avec une perte moyenne de 1,2 % pour le S&amp;P 500 depuis 1928 et des performances n\u00e9gatives 56 % du temps. \u00c0 cette pression s\u2019ajoute le fait que 2026 est une ann\u00e9e d\u2019\u00e9lections de mi-mandat aux \u00c9tats-Unis, ce qui, historiquement, accentue la volatilit\u00e9 et la tendance baissi\u00e8re de fin d\u2019\u00e9t\u00e9. Lors des pr\u00e9c\u00e9dentes ann\u00e9es de mi-mandat, septembre a affich\u00e9 une baisse moyenne d\u2019environ 2 %, les plus fortes phases de repli intra-annuel se concentrant g\u00e9n\u00e9ralement entre ao\u00fbt et octobre.<\/p>\n<p>Sur le plan technique, nous suivons une baisse potentielle en cinq vagues, en parfaite coh\u00e9rence avec ces vents contraires saisonniers. Une rupture sous 7 638 d\u00e9clencherait une jambe baissi\u00e8re en vague c visant la zone 7 100 \u00e0 7 200, o\u00f9 la moyenne mobile \u00e0 200 jours se situe actuellement autour de 7 119. Cette zone constitue un cluster de supports Fibonacci crucial et servirait vraisemblablement d\u2019objectif final pour cette phase corrective.<\/p>\n<h3>Strat\u00e9gies sur produits d\u00e9riv\u00e9s pour naviguer le risque baissier<\/h3>\n<p>En tant qu\u2019op\u00e9rateurs sur d\u00e9riv\u00e9s, nous devrions nous pr\u00e9parer \u00e0 intervenir dans les deux sc\u00e9narios autour de ce niveau pivot au moyen de strat\u00e9gies options \u00e0 risque d\u00e9fini. Si le support 7 638 est enfonc\u00e9 avec des volumes en hausse, nous devrions rapidement basculer vers l\u2019achat de puts de protection ou la mise en place de bear put spreads afin de tirer parti d\u2019un repli vers 7 120. \u00c0 l\u2019inverse, si les acheteurs d\u00e9fendent ce niveau, nous pouvons chercher \u00e0 accompagner un rebond de court terme vers 7 940 via des bull call spreads, en conservant des stop-loss extr\u00eamement serr\u00e9s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><b>Commencez \u00e0 trader d\u00e8s maintenant \u2014 cliquez <a href=\"https:\/\/www.vtmarkets.com\/fr-eu\/trade-now\/\">ici<\/a> pour cr\u00e9er votre compte r\u00e9el VT Markets.<\/b>\n\n<\/p>","protected":false},"excerpt":{"rendered":"<p>Attention, septembre pi\u00e8ge le S&#038;P 500 : pire mois depuis 1928 (-1,2% moyen), aggrav\u00e9 en 2026 ann\u00e9e de mi-mandat. Support 7 638 d\u00e9cisif : rupture viserait 7 100\u20137 200 (MM200), options d\u00e9fensives.<\/p>\n","protected":false},"author":87,"featured_media":49680,"comment_status":"","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[24],"tags":[],"class_list":["post-53327","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-live-updates"],"acf":{"acf_article_selection_author":null},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Attention, septembre pi\u00e8ge le S&amp;P 500 : pire mois depuis 1928 (-1,2% moyen), aggrav\u00e9 en 2026 ann\u00e9e de mi-mandat. 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