Partnership ?

The suggestion comes form A Lyng Svensson's Samfundslitteraturs Økonomisk Ordbog, for

interessentskab (sb) partnership;
interessentskab med begrænset hæftelse limited liability partnership, fork. LLP.

or the abbreviation I/S

This is Danish and not necessarily the same thing, but it might be close.

The Oxford Dictionary of Economics (John Black) describes a partnership as:
A busines which has more than one owner but is not incorporated, the individual partners remaining fully responsible for its debts.
Partners need not all be equal: in professional partnerships it is common for senior partners to get a larger share of the rewards and do a smaller share of the routine work than junior partners. The senior partners' contribution is their capital, experience and reputation. Partners may also be either active participants in the business or 'sleeping partners', who provide capital, reputation or guarantees while other partners do most of the wprk.
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You can see it it fits your context.

There are lots of useful references here
http://www.regnskabsordbogen.dk/regn/dkgb/dkgbregn.aspx