{
  "id": 5364715,
  "title": "Sensex puts surge as closing auction sees 2,100-point swing",
  "url": "https://urgent.news/2026/09/03/sensex-puts-surge-as-closing-auction-sees-2-100-point-swing",
  "topic": "finance",
  "section": "Finance & Markets",
  "published": "2026-09-03T15:57:55.000Z",
  "source": {
    "name": "Hindu BusinessLine",
    "slug": "hindu-businessline",
    "url": "https://www.thehindubusinessline.com/markets/sensex-puts-surge-as-closing-auction-sees-2100-point-swing/article71424868.ece"
  },
  "original_language": "en",
  "account": "On the expiry day, Sensex put options experienced a sharp surge after the index plummeted over 2,000 points within three minutes during the closing auction session on Thursday, reigniting concerns about insufficient liquidity in auction. By the end of the day, the Sensex had dropped 417.49 points, or 0.55 percent, to 76,152.86. The Nifty also closed lower at 23,873.45, or 0.17 percent, following the volatile trading. The dramatic swing saw out-of-the-money put options increase dramatically during the auction, as the 30-stock benchmark index tumbled close to 74,370 points from around 76,510 before settling 400 points lower. Since its inception on August 3, the post-trade auction (CAS) has witnessed significant price fluctuations due to limited participation. Earlier this week, former Member of Parliament and BJP leader Kirit Somaiya had called for the suspension and redesign of the new CAS mechanism following a staggering 2,200-point Sensex swing on August 27, 2026, the BSE monthly F&O contract settlement day. In response to today's similar swings, several traders have expressed their dissatisfaction on social media directed at the CAS. The CAS is a brief end-of-day auction where buy and sell orders are matched to determine the official closing price, akin to systems employed in China, Taiwan, Hong Kong, and South Korea. It superseded the previous method of averaging prices from the last 30 minutes of trading.",
  "summary": "Since its introduction on August 3, CAS has seen sharp price swings and divergence due to a lack of participation.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}