The -100 (^NDX) is a  market index made up of 102 equity issued by 100 of the largest non- companies listed on the Nasdaq  market. It is a modified capitalization-weighted index. The stocks' weights in the index are based on their market capitalizations, with certain rules capping the influence of the largest components. It is based on exchange, and it does not have any companies. The companies are in a separate index, the  -100.

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