The Nasdaq-100 is a stock market index made up of equity securities issued by approximately 100 of the largest non-financial companies listed on the Nasdaq stock exchange. The Nasdaq-100 is often abbreviated as NDX, NDQ, NAS100, or US100. There is approximately $1.4 trillion in assets tracking the index, including exchange-traded funds, mutual funds, and derivatives.
The Nasdaq-100 index is a public float weighted/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. The index is limited to companies from a single exchange, and it does not have any financial companies. The financial companies are in a separate index, the Nasdaq Financial-100.Wikipedia