Taiwan Stock Exchange to align odd lot trading hours from December 7

The Taiwan Stock Exchange has announced significant updates to the odd lot trading system, effective December 7. Under the new regulations, the opening time for intraday odd lot trading will be moved forward by 10 minutes to 9:00 AM, aligning it with the standard whole-share market. Order placement will also begin earlier, at 8:30 AM.

To enhance market transparency, the exchange will implement a pre-opening information disclosure mechanism. Between 8:30 AM and 9:00 AM, simulated transaction prices, volumes, and the best five price levels will be disclosed every five seconds to help investors assess supply and demand.

A new volatility control mechanism will also be introduced. If the simulated transaction price fluctuates by more than 3.5% in the minute before opening, or if order cancellations and changes exceed 30% of total reported volume, the first matching process will be delayed by two minutes.

The exchange noted that the whole-share and odd lot markets operate independently. Consequently, opening prices and actual opening times may differ for the same stock depending on the specific market conditions and volatility controls applied to each.