Direct Answer
The CROBEX10 is a rule-based measurement of Croatian blue-chip equity benchmark, maintained by Zagreb 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 CROBEX10 covers Croatian blue-chip equity benchmark, within the Croatia market. Zagreb 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 10 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
Weighted by free float market capitalisation, with no share allowed above 19% of the index at the weight limit date, applied six business days before the regular revision through weighting factors.
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
Only CROBEX constituents qualify, ranked 50% on free float market capitalisation share and 50% on order book turnover share over six months. Companies where one shareholder owns more than 75% of equity are excluded, and only one share class per issuer is included.
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 new share can enter through an extraordinary revision if it trades on 100% of sessions in its first 30 days after listing, which can push the index above ten shares.
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
Regular revisions follow the close on the third Friday of March, June, September and December. Composition changes only in March and September on six months of data, while June and December update share numbers, free float and weighting factors.
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
An 8 over 12 tolerance zone applies: the top eight ranked shares enter directly and the last two places go to shares ranked ninth to twelfth, with preference to existing constituents.
References
- Zagreb Stock Exchange: Zagreb Stock Exchange Resolution on the CROBEX10 index, as published 2025. Every rule described on this page is taken from this document.
Current CROBEX10 constituents
Zagreb Stock Exchange publishes and licenses the CROBEX10 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.
- Europe 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 CROBEX10?
Zagreb Stock Exchange maintains the CROBEX10 and publishes the methodology document that defines its eligibility and weighting rules.
What does the CROBEX10 measure?
It measures Croatian blue-chip 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 CROBEX10 constituents?
Zagreb Stock Exchange publishes the current constituent list. Swoopr does not republish it, because index providers license constituent data and Swoopr holds no such licence.