Unregistered Company is not a defined under the Companies Act 2013.
The expression Unregistered Company is explained in section 375 of the said act.
Who can be considered as Unregistered Company?
It shall include any partnership firm, limited liability partnership or society or co-operative society, association or company consisting of more than seven members.
Who are not considered as Unregistered Company?
(i) a railway company incorporated under any Act of Parliament or other Indian law or any Act of Parliament of the United Kingdom; (ii) a company registered under this Act; or (iii) a company registered under any previous companies law and not being a company the registered office whereof was in Burma, Aden, Pakistan immediately before the separation of that country from India;
Winding up of unregistered company
The provisions for winding up of unregistered company is described in the Part II of the Chapter XXI of the companies act 2013.