{"id":28497,"date":"2026-08-31T12:17:12","date_gmt":"2026-08-31T12:17:12","guid":{"rendered":"https:\/\/www.samco.in\/help-support\/?post_type=ht_kb&#038;p=28497"},"modified":"2026-09-04T06:39:28","modified_gmt":"2026-09-04T06:39:28","slug":"key-changes-in-the-pre-open-session-from-september-7-2026","status":"publish","type":"ht_kb","link":"https:\/\/www.samco.in\/help-support\/article\/key-changes-in-the-pre-open-session-from-september-7-2026\/","title":{"rendered":"Key Changes in the Pre-Open Session from September 7, 2026"},"content":{"rendered":"\n<p>Every trading day starts with a short 15-minute window before the market opens. This is called the Pre-Open Session. It also shows you whether a stock has moved up or down since yesterday&#8217;s close, and it feeds into where the Nifty and Sensex open.<\/p>\n\n\n\n<p>From September 7, 2026, the timings inside this window are changing. You don&#8217;t need to do anything this article just explains what&#8217;s different, in simple terms.<\/p>\n\n\n\n<p><strong>Before and after: the timing changes<\/strong><\/p>\n\n\n\n<div style=\"width:100%;margin:20px 0;font-family:Inter,Arial,sans-serif;\">\n<table style=\"width:100%;border-collapse:collapse;border-spacing:0;background:#fff;color:#222;font-size:15px;line-height:1.5;table-layout:fixed;border:1px solid #d9d9d9;\">\n<thead>\n<tr>\n<th style=\"width:58%;padding:16px 12px;text-align:left;vertical-align:middle;font-weight:700;background:#f7f7f7;border:1px solid #d9d9d9;\">What happens<\/th>\n<th style=\"width:18%;padding:16px 12px;text-align:left;vertical-align:middle;font-weight:700;background:#f7f7f7;border:1px solid #d9d9d9;\">Before<\/th>\n<th style=\"width:24%;padding:16px 12px;text-align:left;vertical-align:middle;font-weight:700;background:#f7f7f7;border:1px solid #d9d9d9;\">From September 7, 2026<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">Limit and Market orders allowed<\/td>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">9:00 AM \u2013 9:08 AM<\/td>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">9:00 AM \u2013 9:05 AM<\/td>\n<\/tr>\n<tr style=\"background:#fcfcfc;\">\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">Only Limit orders allowed; order entry can close any time, with <strong>random close between 9:08 AM and 9:10 AM<\/strong><\/td>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;\">\u2013<\/td>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">9:05 AM \u2013 9:10 AM<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">Orders matched, opening price set<\/td>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">9:08 AM \u2013 9:12 AM<\/td>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">9:10 AM \u2013 9:12 AM<\/td>\n<\/tr>\n<tr style=\"background:#fcfcfc;\">\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">Market prepares to open for normal trading<\/td>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">9:12 AM \u2013 9:15 AM<\/td>\n<td style=\"padding:16px 12px;text-align:left;vertical-align:middle;border:1px solid #d9d9d9;word-wrap:break-word;\">9:12 AM \u2013 9:15 AM<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<style>\n@media(max-width:600px){\ntable{font-size:14px!important;line-height:1.45!important;}\ntable th,table td{padding:16px 12px!important;word-break:normal!important;overflow-wrap:break-word!important;}\ntable th:nth-child(1),table td:nth-child(1){width:48%!important;}\ntable th:nth-child(2),table td:nth-child(2){width:23%!important;}\ntable th:nth-child(3),table td:nth-child(3){width:29%!important;}\n}\n<\/style>\n<\/div>\n\n\n\n<p><strong>So in short: <\/strong>your Market order window is 3 minutes shorter (ends at 9:05 AM instead of 9:08 AM), and order matching starts 2 minutes later (9:10 AM instead of 9:08 AM). The full session still runs 9:00 AM to 9:15 AM.<\/p>\n\n\n\n<p><strong>Order type rules<\/strong><\/p>\n\n\n\n<ul><li><strong>No iceberg orders.<\/strong> Every order placed in Pre-Open must show its full quantity, you can&#8217;t disclose only part of it.<\/li><li><strong>No stop-loss orders.<\/strong> These aren&#8217;t allowed during Pre-Open. Place them after 9:15 AM, once normal trading begins.<\/li><li><strong>Algo-based Market orders are now allowed in Phase 1 (9:00\u20139:05 AM).<\/strong> Earlier, algo-tagged Market orders were blocked in this window that restriction has been removed.<\/li><li><strong>Market orders get matched before Limit orders.<\/strong> If you have both pending at the same time, your Market order will be filled first.<\/li><\/ul>\n\n\n\n<p><strong>What this means for you?<\/strong><\/p>\n\n\n\n<ul><li><strong>Less time for Market orders. <\/strong>Earlier, you could place a Market order until 9:08 AM. Now that window closes at 9:05 AM after that, only Limit orders can be placed.<\/li><li><strong>Place Limit orders early. <\/strong>Between 9:08 AM and 9:10 AM, the exchange can stop accepting orders at any moment, not necessarily right at 9:10 AM. Try to place or update your Limit orders before 9:08 AM to be safe.<\/li><li><strong>Confirmations arrive a little later. <\/strong>Order matching now starts at 9:10 AM instead of 9:08 AM, so your opening price and trade confirmation will show up a couple of minutes later than before. This is expected.<\/li><\/ul>\n","protected":false},"author":65,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":[],"ht_kb_category":[2893],"ht_kb_tag":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/ht_kb\/28497"}],"collection":[{"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/ht_kb"}],"about":[{"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/users\/65"}],"replies":[{"embeddable":true,"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/comments?post=28497"}],"version-history":[{"count":9,"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/ht_kb\/28497\/revisions"}],"predecessor-version":[{"id":28529,"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/ht_kb\/28497\/revisions\/28529"}],"wp:attachment":[{"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/media?parent=28497"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/ht_kb_category?post=28497"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/www.samco.in\/help-support\/wp-json\/wp\/v2\/ht_kb_tag?post=28497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}