Capitalism as an economic system is the private ownership of the means of production and relies on the extraction of surplus value from the labor of others.
A capitalist is a person who, within a capitalist society, has capital and owns or controls the means of production.
Any owner, controlling partner, or executive in a major corporation in the US I feel should fit the definition of a capitalist. They own capital and control the means of production.
@finner No. That is not what a capitalist is. And if it were it wouldn't me limited to a capitalist economic model. You can have capital in any economic model.
But a capitalist is a supporter of the capitalist economic model. A poor person can be a capitalist, and a CEO of a Fortune 500 company can be a communist just fine.
Also only the first part of your definition of capitalism is correct. 'Extracting value from the labour of others', is not accurate.