Description

Special Pre-Open Session on October 14, 2025 for price discovery post-demerger of Tata Motors Limited. TML Commercial Vehicles Limited to be added to 28 BSE indices at zero price.

Summary

BSE will conduct a Special Pre-Open Session (SPOS) on Tuesday, October 14, 2025 to enable price discovery for Tata Motors Limited (Ticker: 500570, TATAMOTORS) following its demerger. Effective from October 14, 2025, TML Commercial Vehicles Limited will be added to 28 BSE indices at zero price after the close of Monday, October 13, 2025, without divisor adjustment.

Key Points

  • Special Pre-Open Session scheduled for October 14, 2025 for Tata Motors Limited price discovery
  • TML Commercial Vehicles Limited to be added to 28 BSE indices including BSE SENSEX
  • Addition effective from October 14, 2025 at zero price
  • No divisor adjustment will be made for index additions
  • Corporate action relates to scheme of arrangement/demerger of Tata Motors Limited

Regulatory Changes

No regulatory changes introduced. This is a procedural circular for implementing a corporate action.

Compliance Requirements

  • Market participants should note the Special Pre-Open Session on October 14, 2025
  • Investors and traders should be aware of the demerger impact on Tata Motors Limited
  • Index-linked funds and portfolios tracking the 28 affected indices must account for the new constituent addition
  • Queries should be directed to bseindex@bseindia.com

Important Dates

  • October 7, 2025: Circular notice date
  • October 13, 2025: Last trading day before demerger becomes effective (close of market)
  • October 14, 2025: Special Pre-Open Session for Tata Motors Limited; TML Commercial Vehicles Limited added to indices

Impact Assessment

Market Impact: High - Affects major benchmark BSE SENSEX and 27 other indices. The demerger of a prominent constituent like Tata Motors will impact index compositions and weights.

Trading Impact: Special Pre-Open Session required for orderly price discovery, indicating significant market event requiring special trading arrangements.

Index Impact: 28 indices affected including:

  • Flagship indices: BSE SENSEX, BSE 100, BSE 200, BSE 500
  • Sectoral indices: BSE AUTO, BSE CONSUMER DISCRETIONARY, BSE INDIA MANUFACTURING INDEX
  • Thematic indices: BSE LARGECAP, BSE ALLCAP, BSE 100 ESG INDEX
  • Equal weight and specialized indices

Investor Impact: Shareholders of Tata Motors Limited and investors with exposure to the 28 affected indices need to adjust portfolios and understand the demerger implications. Index funds will need rebalancing to accommodate the new constituent.

Impact Justification

Major corporate action involving demerger of Tata Motors (BSE SENSEX constituent) and addition of new entity to 28 indices including flagship BSE SENSEX. Requires special trading session for price discovery affecting multiple index compositions.