As of December 2025 National Grid has a market cap of โฌ64.62 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 Dec 4th, 2025 the market cap of National Grid was reported to be: