What is the board lot size?

The standard board lot size is 100 units. However, certain products such as ETFs may trade in other board lot sizes.

The SG Market also has a Unit Share Market to facilitate the trading of odd lots in any quantity less than one board lot of the underlying securities in the Ready Market.

From 5 October 2026, the standard board lot size will be revised to improve adaptability and accessibility for investors by enabling higher-priced securities to be traded in smaller minimum quantities. The revised standard board lot is as follows: 

* For securities traded in foreign currencies, the corresponding traded currency threshold applies. For securities with more than one traded currency, the primary traded currency counter will determine the standard board lot applied.

Quarterly review process

A review will be conducted every calendar quarter to determine if the board lot sizes of the specified instruments traded on SGX-ST should be reduced. In determining an instrument’s price range and thus whether its board lot size should be reduced, SGX will consider whether the instrument’s last traded price or closing price has been continuously in the price range for the previous six months or is likely to do so in the future.

SGX will announce any board lot size reduction within the first five trading days after the quarter, with implementation within the first five trading days of the second month after the quarter. 

To facilitate a smooth transition on the first day that an instrument trades with its new board lot size, SGX will purge all resting orders for the specified instruments at the close of business on the last trading day before the implementation of the new board lot size.