Definition
Capital stock is the aggregate of shares that a corporation is authorized to issue, representing the financial foundation upon which the corporation is organized. In practice, the term carries two related but distinct meanings that context determines:
1. Authorized capital stock. The total number and classes of shares that a corporation's charter or articles of incorporation permit it to issue. This is a ceiling set at formation and adjustable only by charter amendment.
2. Subscribed or issued capital stock. The actual fund raised by shareholders who have subscribed for and paid into shares — the sum contributed to the corporation by its stockholders in exchange for ownership interests, upon which dividends are declared and, historically, upon which assessments or calls could be made.
The two meanings track different stages of corporate finance: authorization is a legal capacity; subscription and issuance are the economic reality. In older sources the term almost exclusively describes the subscribed fund, not the authorized ceiling.
Common Language
Modern common usage (Wiktionary): "The total amount of common and preferred stock (shares) that a company can issue."
Historical common usage (Webster's 1913): Capital stock was understood as the invested fund of a corporation — the money actually put in by shareholders — treated as a fixed, permanent fund distinguishable from profits or surplus.
The gap matters for research. The modern lay understanding (and Wiktionary's framing) treats capital stock as the authorized maximum — what can be issued. Historical legal usage, and much of the case law embedded in the dictionary sources, treats capital stock as the fund actually contributed — what has been paid in. A researcher reading a nineteenth-century opinion or charter document should not import the modern authorized-shares sense. The shift in emphasis tracks the evolution of corporation law from capital-impairment doctrines toward modern no-par and authorized-shares frameworks.
Common Confusion
Capital stock is frequently conflated with two related concepts:
Capital stock vs. surplus. Capital stock, in the classical sense, is the permanent fund contributed by shareholders. Surplus is the accumulated excess of assets over that contributed fund. Corporate dividend and solvency statutes historically turned on this distinction — dividends could be paid from surplus but not from capital stock. The terms are not interchangeable.
Capital stock vs. shares of stock. Individual shares are the units into which capital stock is divided. Capital stock is the aggregate; a share is the fractional interest. Historical sources sometimes use "capital stock" loosely to mean shares, which can obscure whether the writer means the total fund or a particular stockholder's interest.
Recognized Forms
/SUBTYPES
Common stock. Residual equity — shares carrying voting rights and a claim to earnings after prior claims are satisfied.
Preferred stock. Shares with preferential rights to dividends or liquidation proceeds, typically ahead of common stockholders.
Treasury stock. Issued shares that have been reacquired by the corporation; treated as issued but not outstanding.
Unissued stock. Authorized shares not yet sold or distributed.
Why It Matters in Research
Temporal precision is essential. Before the widespread adoption of no-par value stock legislation in the early twentieth century, capital stock doctrine carried enormous legal weight. Statutes prohibiting impairment of capital stock governed dividend payments, asset distributions, and creditor protections. Cases from this era use "capital stock" to mean the inviolable contributed fund, not simply the authorized share structure. Researchers analyzing pre-1920 corporate disputes must read the term in this older, narrower sense.
Tax law created parallel but divergent usage. State franchise and property taxes were frequently levied on "capital stock" as a tax base, and the definition adopted by taxing authorities sometimes differed from the corporate law definition. The Rapalje & Lawrence entry flags early U.S. Supreme Court cases addressing this distinction. A researcher following a tax dispute into the case law will find the same phrase doing different work depending on the legal context.
The authorized-vs.-issued distinction became more consequential as corporate statutes modernized. Researchers working with twentieth-century materials should verify whether the source jurisdiction's statute at the relevant time defined capital stock as the authorized maximum or the actually-subscribed fund — these produced different results in insolvency, dividend, and capitalization analysis.
Cross-corpus connections. Capital stock doctrine connects directly to par value, stated capital, and paid-in surplus — a cluster of concepts that together defined the boundary between distributable and non-distributable corporate assets under most pre-Model Business Corporation Act regimes. The Law Mind encyclopedia entries on capitalization and equity securities develop this framework in detail.
Historical Dictionary Support
The five dictionary sources converge on the subscribed-fund definition: capital stock is the money raised by stockholder subscriptions, divided into shares, forming the corporate fund. Bouvier, Black's (both editions), and Rapalje & Lawrence are essentially in agreement on this core meaning. All three note the two functional consequences: that calls (assessments) may be made upon stockholders up to the subscribed amount, and that dividends are payable from this base.
Burrill adds a useful conceptual distinction — capital stock as the amount contributed or advanced by stockholders, as distinguished from the corporation's property. This tracks the classical doctrine that capital stock is the liability side (what stockholders owe or have committed), while corporate property is the asset side that capital generates. The distinction mattered in early American corporate law when capital contributions could be called in installments.
Black's first edition offers an interesting historical note — that originally "capital stock of the bank" meant all property of every kind that the bank possessed. This broader early usage, in which capital stock equaled total corporate assets rather than merely the subscribed fund, had faded by the time these dictionaries were compiled. Researchers working with very early nineteenth-century bank charters and opinions should be alert to this even older, more expansive meaning.
What the historical dictionaries miss: none of the five sources adequately addresses authorized-but-unissued capital stock as a distinct legal concept, nor do they anticipate the no-par value share structure that would become dominant. Their definitions are almost entirely calibrated to par-value, subscription-based corporate finance. Modern authorized-shares analysis requires supplementation beyond these sources.
Jurisdictional Note
Definitions and the legal consequences attached to capital stock varied significantly by state, particularly during the nineteenth and early twentieth centuries when state corporate law was not yet substantially harmonized. The adoption of no-par value stock (New York led in 1912) began disaggregating "capital stock" into authorized shares, stated capital, and paid-in surplus — concepts that do not map cleanly onto the older unitary definition. Researchers should identify the governing state statute and its vintage before applying any general definition.
Encyclopedia Cross-Reference
Corporate Finance — Capitalization, Par Value, and Stated Capital (The Law Mind Business Organizations & Corporate Law Encyclopedia)
Corporate Finance — Types of Equity Securities (Common Stock, Preferred Stock) (The Law Mind Business Organizations & Corporate Law Encyclopedia)