Tick Size Optimization (completed)



Tokyo Stock Exchange (TSE) changed the tick size for the medium liquidity stocks (TOPIX Mid400) on June 5, 2023. The applied change matches the tick size for TOPIX Mid400 constituents to the TOPIX 100 constituents.

To align with this change, Japannext PTS has also applied the tick size change to the J-Market and the X-Market. 

The same tick size change for the J-Market is applied to the Night Session.



A comprehensive security master file in JSON format is provided as documented at the library. It can be used as a replacement for the legacy security master file and adds the tick table used for every security.

Summary of changes

See the Tick Tables below for details of the change.