CAS effect: Pre-open session rules to change from today. What changes for investors?
- Posted on September 7, 2026
- By Business News Today
- 1 Views
- 1 min read
In brief
Stock exchange regulations are undergoing significant modifications affecting pre-market trading dynamics. Beginning today, institutional and retail investors face stricter requirements during the final phase of the pre-open session. The elimination of market orders after 9:05 AM represents a fundamental shift in execution strategies, compelling traders to adopt limit order protocols instead. These regulatory adjustments aim to enhance market stability and price discovery mechanisms while reducing volatility during the critical opening phase.
Summary auto-generated by AI from the original publisher's content. Editorial standards.
CAS effect: Pre-open session rules to change from today. What changes for investors?
The change is important for traders who usually place orders closer to the end of the pre-open session. Under the new system, they will no longer be able to put in market orders after 9:05 am and will have to specify a price through a limit order.
