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Common ownership is a principle according to which the assets of an enterprise or other organization are held indivisibly rather than in the names of the individual members. It is therefore in contrast to public ownership.
Many socialist movements advocate common ownership of the means of production as an eventual goal or outcome of development of the productive forces. Socialists make the distinction between collective ownership (such as corporate/private ownership and state ownership) and common property.
In political philosophy, common ownership refers to joint ownership by all individuals in society. Common ownership of the means of production is advocated, or asserted, by communism and some forms of socialism. Common ownership differs from collective ownership. The former means property open for access to anyone, and the latter means property owned jointly by agreement. Examples of collective ownership include modern forms of corporate ownership as well as producer cooperatives, which are in contrast to forms of common ownership, such as a public park available to everyone.
Common ownership of land is an example of customary land ownership in tribal societies which predates and runs simultaneously to the arrangement of colonised alienated land. Tribes and families living on the land have common ownership through tradition.
In Marxist theory, Primitive communism was based on common ownership on a subsistence level. Marxists argue that pre-Neolithic tribes held property in common.
The principle was adopted by the “new wave” workers’ co-operative movement during the 1970s, and continues into the present day, although it is less common. In 1976, the British Parliament passed the Industrial Common Ownership Act (“ICO Act”), which gave £100,000 of "seed" funding to the Industrial Common Ownership Movement (ICOM) and £50,000 to the Scottish Co-operative Development Committee (SCDC), respectively. ICOM was fueled by three strands of thought–Christian socialism, workers’ control and “rice and sandals” alternativism–and successfully promoted the creation of over 2,000 worker’s co-operatives, before merging in 2001 with the Co-operative Union to form Co-operatives UK, thus reuniting the worker co-operative and consumer co-operative sectors.
In parallel, the growth of some 60 local co-operative development agencies (CDAs), supported by local authorities, gave on-the-spot start-up assistance to groups wanting to create a co-operative. Some local retail co-operative societies were also active. By combining personal, community, and business development, this movement brought many disadvantaged people the opportunity to go into business for themselves on the basis of economic democracy, equal opportunities, and social inclusion.
Finance: The ICO Act also established a £250,000 rotating loan fund managed by Industrial Common Ownership Finance Ltd (ICOF). ICOF — since 2005 trading as Co-operative and Community Finance- has grown steadily and now manages a range of funds totalling some £4.5 million. Some of these have been endowed by public bodies, and others were raised through public subscription. This was the start of the ethical investment movement in Britain.
Currently, as signalled by the British Labour Party’s abandonment of “clause 4” of its constitution, which called for common ownership and was printed on party membership cards, ideology has given way to pragmatism, and the social enterprise movement focuses on outcomes rather than structures.
Various socialist movements (especially libertarian socialism) advocate common ownership of the means of production by all of society, although sometimes socialists classify socialism as public ownership of the means of production and define upper-stage socialism, or pure communism, as common ownership of the means of production and a classless society based upon a superabundance of goods and services. Public or state ownership of industry is viewed as a temporary measure during the transition from capitalism to socialism which eventually is displaced by common ownership of industry as state authority becomes obsolete when the distinction between classes evaporates. However, common ownership in a hypothetical socialist society is distinguished from primitive forms of common property that have existed throughout history, such as communalism and primitive communism.
It is the practical application of the socialist desire to achieve the “common ownership of the means of production” (see Clause IV). Its purpose, by preventing control being obtained through the purchase of a company’s share capital, is to ensure that the founders’ aims are pursued in perpetuity. This is particularly desirable to the founders of a workers’ co-operative, who, inspired by solidarity and the desire to create fulfilling employment, will typically build the business up through hard and low-paid work (misleadingly called “sweat equity”). They may out of a sense of fairness wish to hinder future generations of employees, or their heirs, from winding up the co-operative so as to be able to share the sale proceeds among themselves (see asset stripping).
In practice 
Common ownership is practised by large numbers of voluntary associations and non-profit organizations, by all charities, as well as implicitly by all public bodies. Most co-operatives have some element of common ownership, but some part of their capital may be individually owned.
A very significant early influence on the movement has been the Scott Bader Commonwealth, a composites and speciality polymer plastics manufacturing company in Wellingborough, Northamptonshire, which its owner, Ernest Bader, gave to the workforce in installments through the late 1950s to early 1960s. (Contrary to the popular concept of common ownership organisations as being small organisations, this is a high-technology chemical manufacturer whose turnover has exceeded £100 million per annum since the early 1990s with a workforce of hundreds.)
In London, Calverts is another rare example of an established worker co-operative with a policy of pay parity. The John Lewis Partnership is probably the most famous example of a worker co-operative, albeit one without pay parity. From the collective movement, one of the most successful ventures is probably Suma Wholefoods in Elland, West Yorkshire.
UK law 
- the first provides that the company’s assets shall be applied solely in furtherance of its objectives and may not be divided among the members or trustees.
- the second provides for "altruistic dissolution”, an "asset lock", whereby if the enterprise is wound up, remaining assets exceeding liabilities shall not be divided among the members but shall be transferred to another enterprise with similar aims or to charity.
British law has been reluctant to entrench common ownership, insisting that a three-quarters majority of a company’s members, by passing a “special resolution”, have the right to amend a company’s memorandum of association. This three-quarters majority above applies to most limited companies, except that it is possible since 2006 to entrench altruistic dissolution in an industrial and provident society registered as a 'community benefit society' ('bencom'). This statutory asset lock is not available to societies registered as 'bona fide' co-operatives. However such entrenchment has also been written into the Community Interest Company (CIC), a new legal status that was introduced in 2005.
See also