I hope it helps!

Another option.

Capital social tiene muchas acepciones. La traducción correcta depende del context. Aquí van algunas acepciones - tú eliges :
capital social corporate capital.
capital social company's capital.
capital social partnership capital.
capital social funds.
capital social social capital.
capital social stock capital.
capital social joint stock.
capital social firm's capital.
capital social capital stock.
capital social capital stock of a corporation.
capital social equity capital.
capital social equity.
capital social nominal capital.
capital social registered capital.
capital social share capital.
capital social pyramiding.

These are the ownership shares of a corporation, consisting of all types of "common" and "preferred" stock.
References:
Accounting: The Language of Business
Sidney Davidson, CLyde P. Stickney, Roman L. Weill
Tom West's Dictionary
Javier Becerra's Dictionary
Black's Law Dictionary has the following definition:
The total number of shares of stock that a corporation may issue under its charter or articles of incorporation, including both common stock and preferred stock.
Hope this helps.
More than 15 years of experience translating for international accounting firms in Mexico City