This document summarizes the different types of companies that exist based on various classification schemes. It discusses companies classified by the number of members (one member companies, private companies, public companies), liabilities (companies limited by shares, companies limited by guarantee, unlimited companies), control (holding companies, subsidiary companies), and location (foreign companies). The key types covered are one member companies, private limited companies, public limited companies, companies limited by shares or guarantee, holding and subsidiary relationships between companies, and foreign companies.