# BSE sees fewer contracts but premiums surge 75% after CAS

2026-08-08T12:50:59+00:00 | Business & Economy | Indian Opinion Desk

Corroboration: 1 independent outlet

BSE’s average daily derivatives contracts fell 30.6% week-on-week to 90 million in the first week of the Closing Auction Session (CAS), but the premium per contract surged 74.8% to Rs 2,605, according to Nuvama Institutional Equities. The jump in premiums helped BSE’s average daily premium turnover value rise 21.3% to Rs 23,500 crore, lifting its market share by 362 basis points to 37.1%. CAS, introduced by Sebi and NSE from August 3, uses a 20-minute auction after regular trading to determine closing prices for eligible F&O stocks, replacing the earlier volume-weighted average method. The change is meant to curb last-minute price swings, but has provoked trader backlash over higher costs and reduced volumes.

## Coverage

- economictimes.indiatimes.com <https://economictimes.indiatimes.com/markets/stocks/news/explained-how-bse-traded-fewer-contracts-after-cas-but-premiums-rose-75-in-first-week/articleshow/133049697.cms>

Tags: BSE, CAS, derivatives, F&O, Nuvama, SEBI
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