July 20, 2024

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How Is All Ordinaries Calculated?

3 min read

The Basics of All Ordinaries

If you are interested in the Australian stock market, you might have come across the term “All Ordinaries.” It is a stock market index that represents the overall performance of the Australian stock exchange. But have you ever wondered how this index is calculated? In this article, we will delve into the details of how the All Ordinaries index is computed and the factors that influence its movements.

What is the All Ordinaries Index?

The All Ordinaries index, also known as the All Ords, is one of the most widely recognized benchmarks for the Australian stock market. It includes the largest 500 companies listed on the Australian Securities Exchange (ASX) based on their market capitalization. The index provides a comprehensive overview of the performance of the Australian stock market and serves as a reference point for investors and analysts.

Market Capitalization Weighting

The calculation of the All Ordinaries index is based on a market capitalization-weighted methodology. This means that the weightage of each company’s stock in the index is determined by its market value. Companies with a higher market capitalization have a greater influence on the movement of the index compared to smaller companies. This methodology ensures that the index reflects the performance of the overall market accurately.

Price and Market Value Adjustments

The All Ordinaries index is adjusted for price changes and changes in the market value of the constituent stocks. Price adjustments are made to account for stock splits, stock dividends, and other corporate actions that affect the share price. Market value adjustments are made to reflect changes in the market capitalization of the constituent companies. These adjustments ensure that the index remains representative of the market as it evolves over time.

Regular Review and Rebalancing

The composition of the All Ordinaries index is reviewed periodically to ensure that it remains up-to-date. Stocks that no longer meet the criteria for inclusion may be removed, while new stocks meeting the criteria may be added. This regular review and rebalancing process help to maintain the relevancy and accuracy of the index.

Sector Representation

The All Ordinaries index provides a broad representation of various sectors within the Australian economy. The index includes companies from sectors such as financials, mining, healthcare, telecommunications, and many more. The sector representation in the index allows investors to gauge the performance of specific industries and track trends within the Australian stock market.

External Factors

While the calculation of the All Ordinaries index is primarily based on market capitalization and stock price adjustments, external factors also play a role in its movement. Economic indicators, interest rates, geopolitical events, and investor sentiment can all influence the performance of the index. It is important for investors to consider these external factors while analyzing the All Ordinaries index and making investment decisions.

Tracking the All Ordinaries Index

Investors can track the performance of the All Ordinaries index through various financial news platforms, market data websites, and stock market apps. The index is usually quoted in terms of its value and percentage change from the previous trading session. By monitoring the All Ordinaries index, investors can gain insights into the overall direction of the Australian stock market and adjust their investment strategies accordingly.


The All Ordinaries index is a crucial benchmark for the Australian stock market. Its calculation involves considering the market capitalization and stock price adjustments of the constituent companies. The index provides a comprehensive overview of the performance of the Australian stock market and helps investors track trends and make informed investment decisions. By understanding how the All Ordinaries index is calculated, investors can gain a deeper insight into the dynamics of the Australian stock market.


This article is for informational purposes only and does not constitute financial advice. Investors should conduct their own research and consult with a qualified financial advisor before making any investment decisions.

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