Three indices, different coverage
The number in each name indicates roughly how many companies the index is built around; the actual count on the list can differ slightly. The exchange decides who is in each one under published rules, and the lists can change over time. To see which index a given company belongs to, check the official constituent list of each index.
What EWI means
In the exchange's official data, EGX70 and EGX100 carry the suffix EWI, short for Equal Weight Index. Their companies get the same weight, so a small company's move counts as much as a large one's. EGX30 has no EWI in its name; each company's weight there is set by the index methodology.
Why they move apart
Because each has different coverage and different weights. One day you might see EGX30 down 0.5% and EGX70 up 1.2%. That means the companies in EGX30 moved down overall, and those in EGX70 moved up overall, each by its own weighting.
Compare the indices yourself
The indices page shows each index's level, today's change and its companies.
Check yourself
1. What does EWI in EGX70's name mean?
2. In an equal-weight index of 100 companies, one rises 20% and the rest are flat. Roughly how much does the index move?
Summary
- The number in an index name roughly indicates its company count; the official list is the reference.
- EGX70 and EGX100 are equal-weight (EWI); EGX30's weights are set by its methodology.
- Different coverage and weights, so different directions are normal.