What is the KSE-100 Index?

The KSE-100 Index is the headline benchmark of the Pakistan Stock Exchange (PSX). Introduced in 1991 with a base value of 1,000 points, it measures the overall direction of the Pakistani equity market by tracking the share prices of 100 selected companies.

The 100 constituents are chosen to represent the market broadly. The index includes the largest company by market capitalisation from each sector, and the remaining places are filled by the biggest remaining companies across all sectors by free-float market capitalisation — the value of shares actually available for public trading, excluding blocks held by sponsors and the government. This free-float weighting means a company's influence on the index reflects its tradable size, not just its total value.

Because it is capitalisation-weighted, large companies move the index far more than small ones. A 1% change in a heavyweight bank, fertiliser, or oil-and-gas stock shifts the KSE-100 much more than a 1% move in a small constituent. As a result, the index level is often driven by a handful of sectors and blue-chip names.

The constituents are reviewed and rebalanced semi-annually, so companies that grow can enter the index while those that shrink or lose liquidity may drop out. When people say "the market rose 500 points today," they almost always mean the KSE-100.

Investors use the index in several ways: as a barometer of market sentiment and the economy, as a benchmark against which fund managers measure their performance, and as the underlying reference for index funds and derivatives. A rising index generally signals optimism about corporate earnings and the economy, while a sustained fall reflects caution or stress.

It is worth remembering what the index does not tell you. It is a price index of large companies, so it can mask weakness in smaller stocks and does not by itself include dividends. A single index level also says nothing about value — a high number simply reflects years of compounding from the 1991 base, not whether shares are cheap or expensive today.

For most PSX investors, the KSE-100 is the first number they check each morning, and it remains the single most-quoted gauge of how Pakistan's stock market is doing.