Or you could say that they are co-owner of their means of production. So, as business owners, are they actually the ultimate capitalists in disguise? :-)
Business owner who doesn't have employees is not really a capitalist, but a self-employed worker. At least if they do some practical labor instead of e.g. investing.
In general, self-employment is quite a different thing from owning of means of production that other people work.
In general, self-employment is quite a different thing from owning of means of production that other people work.