Direct Answer
The KOMPAS100 is a rule-based measurement of Indonesian broad equity benchmark, maintained by Indonesia Stock Exchange. Like every index it owns nothing: it is a number produced by applying a published weighting formula to a selected list of companies, revised on a schedule the provider sets.
What this index covers
The KOMPAS100 covers Indonesian broad equity benchmark, within the Indonesia market. Indonesia Stock Exchange defines which securities are eligible, how they are selected from that pool, and how much each one contributes to the published number.
The name states a target of 100 companies. A target is not a guarantee of the exact count on any given day: corporate actions, dual share classes and pending additions all move the real number around it.
How constituents are weighted
Capped free float adjusted market capitalisation weighted. At each periodic review no constituent weight may exceed 9%. Free float means scripless shares held by investors owning less than 5%, excluding management and treasury stock.
The weighting method is the single biggest driver of how an index behaves. Two indexes covering the same market can diverge for years purely because they weight differently, which is why comparing index levels without knowing the method tells you very little.
What qualifies for inclusion
The universe is 150 stocks from the IDX Composite constituents, ranked by regular market transaction value over the past 12 months. From these, 100 are chosen on liquidity (transaction value, frequency, days traded and free float market capitalisation) and on fundamentals such as financial performance and compliance.
Eligibility rules are the part of an index most readers never look at and the part that decides what it can possibly measure. A screen that excludes a whole sector, or admits only one listing venue, shapes the result far more than any day of trading does.
How long a listing must exist first
A stock must have been listed for at least six months to be in the 150 stock universe.
A seasoning rule is why a large new listing does not appear in an index the week it starts trading. It is a deliberate lag, and it means an index can under-represent a fast-growing part of the market for months at a time.
When the membership is revised
Major reviews in January and July and minor reviews in April and October, effective on the first trading day of February, May, August and November. Changes are announced no later than five exchange days before.
Reconstitution is the one date an index changes shape by design rather than by price. Funds tracking it have to trade toward the new membership, which is why the schedule matters to anyone holding the tracker rather than only to the provider.
The rule that surprises people
The index is jointly developed with the Kompas Gramedia Group, and fundamentals (financial performance, compliance and other factors) are a selection criterion.
References
- Indonesia Stock Exchange: Indonesia Stock Exchange, IDX Index Fact Sheet KOMPAS100 (August 2025), as published 2025. Every rule described on this page is taken from this document.
Current KOMPAS100 constituents
Indonesia Stock Exchange publishes and licenses the KOMPAS100 constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights.
Related reading
- All stock market indexes: how indexes are built, weighted and revised.
- Emerging Markets indexes: others covering the same region.
- Index concentration: measuring how much of an index sits in its largest holdings.
- Index rebalancing and inclusion effects: what happens to a stock when index membership changes.
Frequently Asked Questions
Who maintains the KOMPAS100?
Indonesia Stock Exchange maintains the KOMPAS100 and publishes the methodology document that defines its eligibility and weighting rules.
What does the KOMPAS100 measure?
It measures Indonesian broad equity benchmark. The index is a calculated number applying a weighting formula to a selected list of companies, and it holds nothing itself.
Where can I see the current KOMPAS100 constituents?
Indonesia Stock Exchange publishes the current constituent list. Swoopr does not republish it, because index providers license constituent data and Swoopr holds no such licence.