On Mar. 5, OSX revised rules re index futures/option contract months.
OSX revised Business regulations and Enforcement rules for business regulations in response to the revised method of setting contract months for index futures/options.
Outline of Revisions
For large TOPIX futures contracts, a 13-month contract system will be implemented for specific contract months, with the period for each contract month being 5 years for Jun. and Dec. contract months, and 1.5 years for Mar. and Sep. contract months.
For weekly contract month transactions for Nikkei 225 mini options, a new contract month will be set with the last trading day being the day before every Wednesday (to be moved forward in case of a holiday), this will be the fourth-weekly contract month.
Effectiveness
The revised regulations and rules will be implemented from May 26, 2025.
