As of March 2026 National Grid has a market cap of NZ$144.28 Billion. This makes National Grid the world's 263th 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 Mar 24th, 2026 the market cap of National Grid was reported to be: