Direct Answer
The FTSE/ATHEX Large Cap is a rule-based measurement of Greek large-cap equity benchmark, maintained by FTSE Russell/Athens 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 FTSE/ATHEX Large Cap covers Greek large-cap equity benchmark, within the Greece market. FTSE Russell/Athens Exchange defines which securities are eligible, how they are selected from that pool, and how much each one contributes to the published number.
The index name does not state a fixed company count, so the number of constituents follows the eligibility rules rather than a target.
How constituents are weighted
Weighted by price times shares in issue, adjusted by an investability factor for free float and a capping factor. No company may exceed 10% of the index. Capping is applied twice a year, in two steps: if the first round pushes an uncapped company above 10%, that company is capped as well.
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 25 largest Athens Exchange companies by full market capitalisation that pass the investability screens. Shares must be on the ATHEX main market, only the primary share class counts, and ETFs, investment holding companies, convertible preference shares and call auction securities are excluded. Free float must be above 15% and each stock must pass liquidity tests.
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
Securities must have a minimum trading record of 30 working days since official non conditional trading began, and must have traded on at least half the business days in each of the preceding six calendar months.
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
Reviews use end of April and end of October data, with average market capitalisation taken over the last month of that period. Changes take effect after the close on the third Friday of June and December. A non constituent rising to rank 20 or above enters, and a constituent falling to rank 31 or below leaves. A five company reserve list is published.
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
Ranking uses the average market capitalisation over the final month of the evaluation period rather than a single closing value, and the index reviews only twice a year.
References
- FTSE Russell/Athens Exchange: FTSE Russell FTSE/ATHEX Index Series Ground Rules, as published 2025. Every rule described on this page is taken from this document.
Current FTSE/ATHEX Large Cap constituents
FTSE Russell/Athens Exchange publishes and licenses the FTSE/ATHEX Large Cap constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights.
FTSE Russell/Athens Exchange: official FTSE/ATHEX Large Cap page
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 FTSE/ATHEX Large Cap?
FTSE Russell/Athens Exchange maintains the FTSE/ATHEX Large Cap and publishes the methodology document that defines its eligibility and weighting rules.
What does the FTSE/ATHEX Large Cap measure?
It measures Greek large-cap 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 FTSE/ATHEX Large Cap constituents?
FTSE Russell/Athens Exchange publishes the current constituent list. Swoopr does not republish it, because index providers license constituent data and Swoopr holds no such licence.