The Governmental Society of Infrastructure and Prison Equipment and State Security (SIEPSE) is a public company. It is part of the companies referred to in Law 33/2003 on the Patrimony of Public Administrations in its article 166.2. It belongs to the so-called “investment companies” of “Grupo Patrimonio”.
SIEPSE has the nature of a commercial, anonymous and state-owned company. It corresponds to the Ministry of Finance, through the General Directorate of Patrimony, the exercise of the rights of partner over it, but it operate as an instrumental company of the Ministry of Interior, which define the actions to be developed for the company.
From 1992 to March 2018, the Society (then SIEP S.A.) devoted itself to managing the successive Plans for the Amortization and Creation of Penitentiary Centers. Its action has lead to the renewal of the Spanish prison facilities, dignifying them and guiding them to the aim that the Spanish Constitution assigns them: the reeducation and reintegration of people sentenced to prison. Today, Spain is a reference in the world for the quality, safety and dignity of its prisons.

SIEP built in that period 30 Prison Centers, 30 Social Insertion Centers, 5 Mothers Units, 32 Hospital Custody Units in public hospitals, in addition to hundreds of rehabilitation and improvement works in previously built centers

By agreement of the Council of Ministers dated March 9, 2018 the Society of Prison Infrastructures and Equipment was authorized to expand its functions, so that it can extend its investment activity to the construction of other infrastructures related to State security. . The new purpose recommends modifying the name of the company and, for this reason, the corporate name from that moment becomes “Society of Infrastructure and Equipment Prison and State Security, S.M.E., S.A.”.
Extending the activity of the company to other facilities linked to the security of the State will allow to extrapolate the experience, highly contrasted and accredited, of more than 25 years promoting efficient safety constructions, with technologies, materials and sustainable and avant-garde equipment,.

As of 2018, SIEPSE assumes competence for the construction, expansion, reform and maintenance not only of penitentiary centers, but also of other facilities linked to the security of the State, at the request of the Ministry of the Interior. To this aim, the company modified its corporate purpose, contemplating the realization of as many activities as are necessary for the correct management of the programs and actions foreseen in the State Security Infrastructure Plan or other Action Plans or Programs approved by agreement of Council of Ministers, as well as possible extensions, revisions or modifications approved for them related to infrastructures, equipment and technical assistance.