{"id":2497,"date":"2026-11-08T12:01:11","date_gmt":"2026-11-08T11:01:11","guid":{"rendered":"https:\/\/wegetfunded.com\/?p=2497"},"modified":"2026-11-08T12:02:12","modified_gmt":"2026-11-08T11:02:12","slug":"incident-knight-capital-2d4833","status":"publish","type":"post","link":"https:\/\/wegetfunded.com\/fr\/blog\/incident-knight-capital-2d4833\/","title":{"rendered":"L’incident Knight Capital : un code oubli\u00e9 depuis 2003 a co\u00fbt\u00e9 460 millions de dollars en 45 minutes"},"content":{"rendered":"

L’incident Knight Capital d\u00e9signe le dysfonctionnement technique survenu le 1er ao\u00fbt 2012 chez le courtier am\u00e9ricain Knight Capital Americas LLC, qui a co\u00fbt\u00e9 plus de 460 millions de dollars en 45 minutes de trading. Selon l’ordre de la Securities and Exchange Commission publi\u00e9 le 16 octobre 2013, un fragment de code abandonn\u00e9 en 2003 a \u00e9t\u00e9 r\u00e9activ\u00e9 par erreur sur un seul serveur, provoquant l’envoi de millions d’ordres non voulus sur le march\u00e9.<\/p>\n\n

Un code mort depuis 2003, jamais supprim\u00e9 des serveurs<\/h2>\n

Avant 2012, Knight utilisait une fonctionnalit\u00e9 interne nomm\u00e9e Power Peg pour certains types d’ordres. L’entreprise a cess\u00e9 de s’en servir d\u00e8s 2003, comme le pr\u00e9cise l’ordre de la SEC : \u00ab In 2003, Knight ceased using the Power Peg functionality \u00bb<\/a>. Le probl\u00e8me est que ce code n’a jamais \u00e9t\u00e9 retir\u00e9 des serveurs de production. Il est rest\u00e9 pr\u00e9sent, inactif, pendant neuf ans.<\/p>\n

En 2005, Knight a d\u00e9plac\u00e9 une fonction de comptage cumul\u00e9 \u00e0 l’int\u00e9rieur m\u00eame de ce code Power Peg, sans retester son comportement en cas de r\u00e9activation future. L’ordre de la SEC le souligne : \u00ab Knight did not retest the Power Peg code after moving the cumulative quantity function to determine whether Power Peg would still function correctly if called \u00bb<\/a>. Cette d\u00e9cision, anodine sur le moment, est devenue le point de d\u00e9faillance sept ans plus tard.<\/p>\n\n

Un drapeau logiciel recycl\u00e9 sur un seul serveur<\/h2>\n

Le 1er ao\u00fbt 2012, Knight d\u00e9ploie un nouveau code de routage d’ordres destin\u00e9 \u00e0 remplacer l’ancien syst\u00e8me. Ce d\u00e9ploiement doit toucher huit serveurs. Sur l’un d’eux, un technicien omet de copier le nouveau code, et personne ne s’en aper\u00e7oit faute de proc\u00e9dure de contr\u00f4le. L’ordre de la SEC est explicite sur ce point : \u00ab Knight did not have a second technician review this deployment and no one at Knight realized that the Power Peg code had not been removed from the eighth server, nor the new RLP code added. Knight had no written procedures that required such a review \u00bb<\/a>.<\/p>\n

Le nouveau syst\u00e8me r\u00e9utilise un drapeau logiciel d\u00e9j\u00e0 existant pour d\u00e9clencher le nouveau code. Sur les sept serveurs correctement mis \u00e0 jour, tout fonctionne comme pr\u00e9vu. Mais sur le huiti\u00e8me, ce m\u00eame drapeau r\u00e9active \u00e0 la place le vieux code Power Peg, toujours pr\u00e9sent depuis 2003. La SEC le r\u00e9sume ainsi : \u00ab orders sent with the repurposed flag to the eighth server triggered the defective Power Peg code still present on that server \u00bb<\/a>.<\/p>\n\n

45 minutes de flux d’ordres incontr\u00f4l\u00e9<\/h2>\n

D\u00e8s l’ouverture du march\u00e9, le syst\u00e8me SMARS de routage automatique de Knight commence \u00e0 envoyer des ordres erron\u00e9s sur ce huiti\u00e8me serveur. Le ph\u00e9nom\u00e8ne se poursuit 45 minutes avant d’\u00eatre arr\u00eat\u00e9. Le chiffre donn\u00e9 par la SEC est pr\u00e9cis : \u00ab SMARS routed millions of orders into the market over a 45-minute period, and obtained over 4 million executions in 154 stocks for more than 397 million shares \u00bb<\/a>.<\/p>\n

\u00c0 l’issue de cet \u00e9pisode, Knight se retrouve avec des positions massives et non voulues : une position longue nette d’environ 3,5 milliards de dollars sur 80 titres, et une position courte nette d’environ 3,15 milliards de dollars sur 74 titres. La SEC chiffre la perte finale : \u00ab Knight had assumed a net long position in 80 stocks of approximately $3.5 billion and a net short position in 74 stocks of approximately $3.15 billion. Ultimately, Knight lost over $460 million from these unwanted positions \u00bb<\/a>.<\/p>\n\n

Un chiffre confirm\u00e9 dans les r\u00e9sultats financiers<\/h2>\n

Ce montant n’est pas qu’une estimation r\u00e9glementaire. Dans ses r\u00e9sultats du troisi\u00e8me trimestre 2012, publi\u00e9s via un document d\u00e9pos\u00e9 aupr\u00e8s de la SEC, Knight Capital Group chiffre pr\u00e9cis\u00e9ment l’impact comptable de l’incident. Le document indique des \u00ab pre-tax losses of $461.1 million related to the technology issue that occurred on August 1, 2012 and subsequent related costs \u00bb<\/a>. L’entreprise a ainsi officialis\u00e9, dans ses propres comptes, une perte de 461,1 millions de dollars directement li\u00e9e \u00e0 cette d\u00e9faillance technique.<\/p>\n\n\n\n\n
Les chiffres cl\u00e9s de l’incident Knight Capital<\/caption>\n
\u00c9l\u00e9ment<\/th>Valeur<\/th>Date<\/th><\/tr>\n<\/thead>\n
Dur\u00e9e de l’incident<\/td>45 minutes<\/td>1er ao\u00fbt 2012<\/td><\/tr>\n
Ex\u00e9cutions r\u00e9alis\u00e9es<\/td>plus de 4 millions, sur 397 millions d’actions<\/td>1er ao\u00fbt 2012<\/td><\/tr>\n
Position longue nette<\/td>environ 3,5 milliards de dollars<\/td>1er ao\u00fbt 2012<\/td><\/tr>\n
Position courte nette<\/td>environ 3,15 milliards de dollars<\/td>1er ao\u00fbt 2012<\/td><\/tr>\n
Perte comptable annonc\u00e9e<\/td>461,1 millions de dollars avant imp\u00f4ts<\/td>troisi\u00e8me trimestre 2012<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n

Ce que ce texte ne documente pas : les r\u00e9actions pr\u00e9cises des autres acteurs du march\u00e9 pendant ces 45 minutes, ni le d\u00e9tail des m\u00e9canismes de surveillance interne qui auraient pu d\u00e9tecter l’anomalie plus t\u00f4t. L’ordre de la SEC se concentre sur la cha\u00eene technique de d\u00e9faillance, pas sur une chronologie minute par minute des \u00e9changes de march\u00e9. D’autres d\u00e9faillances techniques ont marqu\u00e9 les march\u00e9s, comme l’incident J-Com, o\u00f9 un ordre invers\u00e9 a co\u00fbt\u00e9 40 milliards de yens \u00e0 Mizuho<\/a>, ou encore les \u00e9pisodes relay\u00e9s dans le journal du 6 novembre 2026 sur la pire s\u00e9ance boursi\u00e8re de l’ann\u00e9e<\/a>.<\/p>\n\n

Questions fr\u00e9quentes<\/h2>\n

Qu’est-ce que l’incident Knight Capital exactement ?<\/h3>\n

C’est un dysfonctionnement technique survenu le 1er ao\u00fbt 2012, o\u00f9 un syst\u00e8me de routage d’ordres automatis\u00e9 a envoy\u00e9 des millions d’ordres non voulus sur le march\u00e9 en 45 minutes, \u00e0 cause d’un vieux code r\u00e9activ\u00e9 par erreur. L’\u00e9pisode a co\u00fbt\u00e9 plus de 460 millions de dollars \u00e0 l’entreprise.<\/p>\n

Pourquoi le code Power Peg a-t-il \u00e9t\u00e9 r\u00e9activ\u00e9 en 2012 alors qu’il datait de 2003 ?<\/h3>\n

Parce qu’il n’avait jamais \u00e9t\u00e9 supprim\u00e9 des serveurs de production apr\u00e8s son abandon en 2003. Lors d’un nouveau d\u00e9ploiement en 2012, un drapeau logiciel r\u00e9utilis\u00e9 a d\u00e9clench\u00e9 ce code dormant sur un seul des huit serveurs, l\u00e0 o\u00f9 le nouveau code n’avait pas \u00e9t\u00e9 correctement install\u00e9.<\/p>\n

Comment l’erreur a-t-elle pu passer inaper\u00e7ue avant le d\u00e9ploiement ?<\/h3>\n

L’ordre de la SEC indique qu’aucune proc\u00e9dure \u00e9crite n’imposait une seconde v\u00e9rification du d\u00e9ploiement par un autre technicien. L’absence de ce contr\u00f4le crois\u00e9 a permis que l’omission sur le huiti\u00e8me serveur ne soit d\u00e9couverte qu’une fois les ordres erron\u00e9s d\u00e9j\u00e0 envoy\u00e9s sur le march\u00e9.<\/p>\n

Quel a \u00e9t\u00e9 le co\u00fbt final pour Knight Capital ?<\/h3>\n

Knight Capital Group a annonc\u00e9 une perte avant imp\u00f4ts de 461,1 millions de dollars li\u00e9e \u00e0 cet incident technique, dans ses r\u00e9sultats du troisi\u00e8me trimestre 2012. Ce montant correspond \u00e0 la fois aux positions non voulues accumul\u00e9es et aux co\u00fbts li\u00e9s \u00e0 leur liquidation.<\/p>\n\n\n

Quentin Belsack<\/p>\n","protected":false},"excerpt":{"rendered":"

L’incident Knight Capital d\u00e9signe le dysfonctionnement technique survenu le 1er ao\u00fbt 2012 chez le courtier am\u00e9ricain Knight Capital Americas LLC, qui a co\u00fbt\u00e9 plus de 460 millions de dollars en 45 minutes de trading. Selon l’ordre de la Securities and Exchange Commission publi\u00e9 le 16 octobre 2013, un fragment de code abandonn\u00e9 en 2003 a […]<\/p>\n","protected":false},"author":2,"featured_media":2496,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_wgf_editorial_author":"quentin","_wgf_editorial_kind":"insolite","footnotes":""},"categories":[49],"tags":[],"class_list":["post-2497","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-insolite"],"yoast_head":"\nIncident Knight Capital : 460 M$ perdus en 45 min<\/title>\n<meta name=\"description\" content=\"L'incident Knight Capital, le 1er ao\u00fbt 2012, a co\u00fbt\u00e9 460 millions de dollars en 45 minutes \u00e0 cause d'un code oubli\u00e9.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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