CAC Mid 60: What It Measures and How It Is Built

Direct Answer

The CAC Mid 60 covers 60 French mid-cap companies that are constituents of the SBF 120 but not of the CAC 40. Administered by Euronext, it uses free-float-adjusted market-capitalisation weighting and sits in the middle tier of the French equity size hierarchy, between the large-cap CAC 40 and the smaller companies covered by the CAC Small.

What this index covers

The CAC Mid 60 covers the France equity market through the Euronext Paris. Euronext defines which securities are eligible, how they are selected from that pool and how much each contributes to the published number.

The eligible universe is: The 60 companies in the SBF 120 that are not constituents of the CAC 40, covering the French mid-cap segment of the Euronext Paris regulated market.

Understanding the eligible universe is the most important step in understanding what an index measures. An index that selects by listing venue will behave differently from one that selects by company domicile, and a sector index will have very different risk characteristics from a broad market measure even if they share some constituents.

How constituents are weighted

Free-float-adjusted market-capitalisation weighting, per the Euronext published methodology.

Weighting is the mechanism that translates a list of companies into a single number. Free-float-adjusted market-capitalisation weighting is the most common method: larger companies contribute more to the index level than smaller ones, and the free-float adjustment excludes shares that are not available to public investors (such as government-held strategic stakes or closely-held founder shares). This makes the index level reflect the actual investable market rather than total market size.

Eligible universe and eligibility rules

Eligibility rules determine which companies can be included at a review and which must exit. The key dimensions to verify are: which exchange or market segment is in scope; whether domicile or listing venue determines eligibility; the minimum free-float threshold; the liquidity screen; and whether there are sector restrictions.

For the CAC Mid 60, the relevant market is the Euronext Paris and the administrator is Euronext. Per the published Euronext methodology (verification date: August 31, 2026), the eligible universe is defined as: The 60 companies in the SBF 120 that are not constituents of the CAC 40, covering the French mid-cap segment of the Euronext Paris regulated market.

Reconstitution schedule

Quarterly, aligned with the SBF 120 review. Constituent changes in the CAC 40 and SBF 120 flow through to the CAC Mid 60.

Reconstitution is the date on which the index changes shape by design rather than by price. Passive funds tracking the index must trade toward the new membership list, which creates predictable order flow around the review date. Active managers often position around reconstitution events to capture or avoid that flow.

How investors use this index

French mid-cap benchmark; used by mandates targeting the segment between large-cap French equities and the small-cap universe; component of the SBF 120 alongside the CAC 40.

For any index, three uses are distinct: as a performance benchmark (measuring how well a portfolio did relative to the market), as a product underlying (an ETF or structured product replicating the index), and as a research reference (tracking market-cap, sector weights or concentration over time). The same index can serve all three purposes, but the choice of which to use depends on the investment mandate and the specific question being answered.

Comparisons with related indexes

The CAC Mid 60 is most often compared with:

• CAC 40: the 40 largest French blue chips; CAC Mid 60 covers the next 60 companies in the SBF 120.
• CAC Next 20: the 20 companies immediately below the CAC 40, ranked 41-60 by float-adjusted market cap; CAC Mid 60 overlaps with and extends beyond this group.
• CAC Small: smaller French companies below the SBF 120 universe; CAC Mid 60 covers the mid-cap segment above them.

When switching from one benchmark to another, the practical question is what changes in coverage: does the alternative add smaller companies, exclude a sector, change the weighting method or extend to a different currency? Each of these changes alters what the index can tell you about market performance.

References

• Euronext: Index Products, as published per the provider's methodology page. All methodology claims on this page are derived from this source.

Current CAC Mid 60 constituents

Euronext publishes and licenses the CAC Mid 60 constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights.

Euronext: official CAC Mid 60 page

Related reading

• All stock market indexes: how indexes are built, weighted and revised.
• European Stock Market 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