Highlights
- The index represents a broad group of large and mid-cap Australian listed companies.
- Companies across financial, materials, healthcare, technology, energy and consumer sectors are represented.
- Index composition is reviewed periodically to reflect changes in eligible market constituents.
The Australian equity market spans financial services, materials, healthcare, technology, energy, industrials, consumer businesses, property and communication services. ASX top 100 refers to the leading group of index-eligible companies listed on the Australian Securities Exchange, covering large and mid-cap businesses across a broad range of industries. The index provides a market-based view of established Australian and internationally active companies.
The companies represented within the index operate across different business models and geographic markets. This creates broad sector representation and allows the index to reflect several important areas of the Australian equity market.
Sector Representation
The ASX top 100 includes businesses from all major industry classifications used within the Australian market. Financial companies represent an important part of the index, alongside materials and resource-related businesses.
Healthcare companies add another significant sector, while technology, energy, industrials, consumer and property businesses contribute further diversity. This mixture means companies within the index can have very different revenue sources, operating structures and financial characteristics.
Sector representation can change over time as companies enter or leave the index based on the applicable index methodology and market conditions.
Market Capitalisation and Company Selection
Company inclusion is linked to float-adjusted market capitalisation, which reflects the value of shares available for public trading. The index focuses on companies that meet established eligibility requirements and rank within the relevant market-capitalisation range.
The ASX top 100 therefore covers businesses positioned across the large-cap and mid-cap segments of the Australian share market. Companies may have operations within Australia or maintain substantial international activities while remaining listed on the Australian exchange.
Market capitalisation can change as share values and corporate structures change, affecting the composition of an index over time.
Index Reviews and Rebalancing
Index composition is reviewed periodically to account for changes among eligible listed companies. Rebalancing can result in companies entering or leaving the index as their market standing changes.
For the ASX top 100, periodic reviews help maintain the index as a representation of leading eligible companies within the Australian equity market. Changes can arise from movements in market capitalisation, corporate events, listings, mergers or other developments that affect eligibility.
Role in the Australian Equity Market
The ASX top 100 provides a broad reference point for examining major listed businesses across multiple industries. Financial services, resources, healthcare, technology, energy, industrial and consumer companies all contribute to the index’s overall composition.
The index can also provide a structured view of companies with substantial market presence and established trading activity. Its combination of large and mid-cap businesses creates sector diversity while reflecting a significant portion of the Australian listed equity market.
Company information, sector classification, market capitalisation and index membership can change over time, making periodic index updates an important part of understanding the ASX top 100 and its composition.




