The answer is corporation. Milady defines it directly: a corporation is an ownership structure controlled by one or more stockholders.
The book adds that incorporating is one of the best ways a business owner can protect personal assets, since corporations raise capital by issuing stock and stockholders can be a single sole shareholder or many. Partnerships, sole proprietorships, and franchises are all real ownership structures covered in the same chapter, just structured differently — none of them centers on stockholders the way a corporation does.
Milady Standard Barbering, 6th ed., Ch. 21 (The Business of Barbering), p. 761: "A corporation is an ownership structure controlled by one or more stockholders."
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