A joint stock company with a limited number of shareholders.

Dupa cunostintele mele, JSC pot fi private sau public (vezi chiar si pe wikipedia).
O prezentare scurta si definitie "user friendly" aici: http://www.ehow.com/about_5169307_joint-stock-company-laws.h...
The private joint stock companies are like private companies whose shares are not traded in the stock market exchanges and are privately held. The public joint stock companies are companies whose shares are publicly traded in open stock exchanges.

Este corect si "unlisted", dar mai des am intalnit asa.

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Note added at 26 mins (2009-11-12 16:37:37 GMT)
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Vezi articolul relevant din Companies Act:
Part 20
Private and public companies
http://www.opsi.gov.uk/Acts/acts2006/ukpga_20060046_en_43

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Note added at 35 mins (2009-11-12 16:46:32 GMT)
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IMPORTANT:
Poate ca nici nu este "joint-stock company", ci "private company limited by shares" http://en.wikipedia.org/wiki/Private_company_limited_by_shar...
Confirmat si de intrebarea kudoz de aici:
http://www.proz.com/kudoz/english_to_romanian/economics/2483...

Formele, denumirile acestea difera in functie de tari.
Dupa cum spune si la raspunsul kudoz indicat, este o forma obisnuita in Ungaria, care e Zrt. (zártkörűen működő - adica "de tip inchis), iar echivalentul acestuia este cu siguranta ***Private company limited by shares.***

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Note added at 3 hrs (2009-11-12 20:07:14 GMT)
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Vroiam sa deschid discussion, dar e prea lung mesajul :-) Asadar:
Recomand si discutia de aici:
http://www.proz.com/kudoz/english_to_romanian/law:_contracts...

Subiectul este extrem de interesant, tinand cont de diferentele dintre legislatii si ca de multe ori nu avem echivalente in legislatia noastra.

1.
Definitia SA: Societatea pe Actiuni este societatea constituita prin asocierea mai multor persoane, care contribuie la formarea capitalului social prin anumite cote de participare reprezentate prin titluri numite actiuni, pentru desfasurarea unei activitati comerciale, in scopul impartirii beneficiilor, si ***care raspund pentru obligatiile sociale numai in limita aporturilor lor***.

2.
Acum, definitia pentru "company limited by shares": A private company limited by shares is a type of company incorporated under the laws of England and Wales, Scotland, that of certain Commonwealth countries and the Republic of Ireland. It has shareholders with limited liability and its shares may not be offered to the general public, unlike those of public limited companies.

"Limited by shares" means that the company has shareholders, and that ***the liability of the shareholders to creditors of the company is limited to the capital originally invested***, i.e. the nominal value of the shares and any premium paid in return for the issue of the shares by the company.

3.
joint-stock company
a company (usually unincorporated) which has the capital of its members pooled in a common fund; transferable shares represent ownership interest; ***shareholders are legally liable for all debts of the company***

A company which has some features of a corporation and some features of a partnership. The company sells fully transferable stock, but ***all shareholders have unlimited liability.*** http://www.investorwords.com/2668/Joint_Stock_Company.html

In baza acestora, mi se pare ca "soc. pe actiuni de tip inchis" ar fi ceea ce propusesem mai sus: "private company limited by shares".

http://en.wikipedia.org/wiki/Privately_held_company
este o alta varianta;"unlisted company" is perfectly fine.

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Note added at 4 hrs (2009-11-12 20:25:03 GMT)
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The term privately held company refers to the ownership of a business company in two different ways: first, referring to ownership by non-governmental organizations; and second, referring to ownership of the company's stock by a relatively small number of holders who do not trade the stock publicly on the stock market. Less ambiguous terms for a privately held company are unquoted company and unlisted company.