• Broad Market Representation: The ASPI is a market-capitalization weighted index. This means the influence of a company's stock price on the overall ASPI value is proportional to the total market value of its outstanding shares. In simpler terms, bigger companies with higher market capitalization have a greater impact on the ASPI's movement.

• Comprehensiveness: The ASPI tracks the performance of all companies listed on the CSE. This provides a broad picture of the overall health and direction of the Sri Lankan stock market.

• Use Case: Investors can use the ASPI to understand how the entire Sri Lankan stock market is performing. They can compare their portfolio's performance against the ASPI to see if it's keeping pace with the broader market.

Focused Representation: The S&P SL20 is a free-float adjusted, market-capitalization weighted index. This means it only considers the freely tradable shares (excluding those restricted by major shareholders) of the 20 largest and most liquid companies on the CSE. Liquidity refers to how easily a stock can be bought and sold.

Blue-Chip Focus: By focusing on the top 20 companies, the S&P SL20 reflects the performance of leading Sri Lankan businesses. This offers insights into the health of large, established companies in the Sri Lankan market.

Use Case: Investors can use the S&P SL20 to gauge the performance of Sri Lanka's biggest companies. This can be helpful for investors interested in investing in well-established and stable businesses.