As of July 2026 National Grid has a market cap of NZ$142.92 Billion. This makes National Grid the world's 292th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Jul 25th, 2026 the market cap of National Grid was reported to be: