The Colombo Stock Exchange (CSE) has announced the quarterly rebalancing of the All Share Price Index (ASPI), with the revised index composition set to take effect from the opening of trading on 22 June 2026, following the market close on 19 June 2026.
The quarterly rebalancing exercise is part of the CSE’s ongoing effort to ensure that the ASPI accurately reflects the current market structure and the publicly tradable shares of listed companies.
The ASPI, which serves as the broad benchmark index of the Sri Lankan stock market, underwent a significant methodology revision in January 2022. The index transitioned from a full market capitalization basis to a float-adjusted market capitalization methodology, meaning only the publicly held shares of listed companies are considered when calculating index weightings.
As companies report their public holding percentages on a quarterly basis, periodic adjustments are required to maintain the accuracy and integrity of the index. The rebalancing process updates company weightings to reflect any changes in public share ownership and market capitalization.
The latest rebalancing will be implemented at the start of trading on 22 June 2026 and is expected to provide investors with a more representative measure of market performance.
Looking ahead, the CSE has announced that the next quarterly ASPI rebalancing exercise for the third quarter of 2026 will take effect after the market closes on 18 September 2026.
The ASPI remains the principal indicator of overall market performance on the Colombo Stock Exchange and is widely used by investors, fund managers, and market analysts to track trends within Sri Lanka’s equity market.
