NSE 20-Share Index

The NSE 20-Share Index is a price-weighted stock market index that tracks the performance of the top 20 best-performing companies listed on the Nairobi Securities Exchange (NSE) in Kenya. It is calculated as the mean of these selected counters, with constituents chosen based on weighted market performance over a review period, considering factors such as market capitalization (40%), shares traded (30%), liquidity/deals (20%), and turnover (10%). Additional criteria include having at least 20% of shares quoted on the NSE, a minimum market capitalization of KES 20 million, and ideally being blue-chip companies with strong profitability and dividend records.

Originally launched in January 1964 as the East African Industrial Share Index by the Nairobi Stock Exchange, which then served Kenya, Uganda, and Tanzania, it started with a base value of 100 and included leading blue-chip stocks like British American Tobacco Kenya, East African Breweries Ltd, and East African Power & Lighting Company. As regional integration shifted and the exchange became national-focused, it evolved into the NSE 20-Share Index, explicitly branded as such by 1984, reflecting its composition of Kenyan-based companies.

The index serves as a key benchmark for the Kenyan equity market, providing a historical continuity of data from 1964 for long-term performance analysis. Current constituents include companies such as Safaricom Ltd, Equity Bank Ltd, KCB Group, East African Breweries Ltd, and others across banking, telecom, manufacturing, and insurance sectors. It remains a critical indicator despite the introduction of newer indices like NSE 25 and All-Share.