Based on market capitalization.

The Energy sector is one of the highest-weighted sectors in the S & P/TSX Composite Index based on market capitalization. This reflects Canada ' s resource-rich economy, where energy companies, including oil, gas, and related services, make up a significant portion of the market.

Other options:

Health care : A relatively small portion of the index.

Utilities : Have a smaller weight compared to energy.

Information technology : While growing, it has not surpassed energy in weight within the Canadian market.