I saw this question over on Quora and thought I'd offer an answer. It is one, of course, that long time readers know I've touched on often.
In the colloquial sense of the word “ownership,” shareholders own the corporation. In a technical legal sense, however, “[s]hareholders own neither the property nor the earnings of the corporation. Shareholders own only stock, from which their income is derived upon the liquidation of assets or the declaration of dividends by directors.” Nelson v. Anderson, 72 Cal. App. 4th 111, 126 (1999) (internal citations omitted).
The technical legal sense is conceptually more accurate. Ownership implies a thing capable of being owned. To be sure, we often talk about the corporation as though it were such a thing, but when we do so we engage in reification. While it may be necessary to reify the corporation for semantic convenience, it can mislead. Conceptually, the corporation is not a thing, but rather simply a set of contracts between various stakeholders pursuant to which services are provided and rights with respect to a set of assets are allocated.
Because shareholders are simply one of the inputs bound together by this web of voluntary agreements, ownership is not a meaningful concept. Someone owns each input, but no one owns the totality. Instead, the corporation is an aggregation of people bound together by a complex web of contractual relationships.
As I explain in detail in my article The Board of Directors as Nexus of Contracts, the shareholders' contract with the firm has some ownership-like features, including the right to vote and the fiduciary obligations of directors and officers.
Even so, however, shareholders lack most of the incidents of ownership, which we might define as the rights to possess, use, and manage corporate assets, and the rights to corporate income and assets. For example, shareholders have no right to use or possess corporate property. Cf. W. Clay Jackson Enterprises, Inc. v. Greyhound Leasing and Financial Corp., 463 F. Supp. 666, 670 (D. P.R. 1979) (stating that “even a sole shareholder has no independent right which is violated by trespass upon or conversion of the corporation’s property”). Management rights, of course, are assigned by statute solely to the board of directors and those officers to whom the board properly delegates such authority. Indeed, to the extent that possessory and control rights are the indicia of a property right, the board is a better candidate for identification as the corporation?s owner than are the shareholders. As an early New York opinion put it, “the directors in the performance of their duty possess [the corporation’s property], and act in every way as if they owned it.” Manson v. Curtis, 119 N.E. 559, 562 (N.Y. 1918).