TSE Handling of Tick Sizes from April 23 onward
Summary
Tokyo Stock Exchange announced that HISAMITSU PHARMACEUTICAL CO., INC. (Code 4530) will no longer be subject to the TOPIX 500 tick size table effective April 23, 2026. The change applies Rule 14, Paragraph 3, Item 1-b of the Business Regulations. This is a routine market microstructure update affecting the bid-ask spread regime for one constituent.
What changed
TSE has removed HISAMITSU PHARMACEUTICAL CO., INC. (Code 4530) from the TOPIX 500 tick size table, effective April 23, 2026. This narrow adjustment means the stock will revert to the standard tick size table applicable to non-TOPIX 500 constituents. The change is administrative in nature and reflects the quarterly or event-driven review of index constituents.
Investors and market participants trading HISAMITSU shares should note that minimum price increments for orders may change from April 23 onward. Broker-dealers with algorithmic trading systems referencing TOPIX 500 tick schedules should verify their pricing logic is updated to reflect this single-stock removal.
Archived snapshot
Apr 21, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Market News
Apr. 21, 2026 TSE Handling of Tick Sizes from April 23 onward
Post As previously announced, TSE have applied a separate set of narrower tick sizes to TOPIX500 constituents (as prescribed in Rule 14, Paragraph 3, Item 1-b of the Business Regulations; hereinafter referred to as "TOPIX 500 tick size table"). The handling of the application from April 23 onward shall be as follows.
・The stocks that will no longer be subject to the application of the TOPIX 500 tick size table from April 23 onward are shown in the table below.
| Code | Stock Name |
| 4530 | HISAMITSU PHARMACEUTICAL CO.,INC. |
About Tick Size Enquiry
Tokyo Stock Exchange, Inc. Equities Department
TEL:Tel: +81-3-3666-0141
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