TREY is an advocacy and service organisation of the students of Tampere University, founded in 2019. Each student that studies for a Bachelor’s or Master’s degree at the university is a member of TREY. In total, TREY has approximately 19,000 members, who study in Tampere, Turku, Pori and Seinäjoki.

In the organisation of the student union, the highest decision-making power belongs to the Council of Representatives, who are elected from among the members every two years in representative elections. The council appoints the Executive Board, which decides on the day-to-day operations of the student union. In addition, there are a number of bodies that are appointed separately each year and operate under the Executive Board. For the purpose of providing daily services and doing long-term advocacy work, the student union employs a number of specialists and office staff.

Three committees, the Administrative Committee, the Committee for Financial Affairs and the Honorary Committee, operate under the Council of Representatives.

TREY is a member of the National Union of University Students in Finland, the Finnish Students Sports Federation and Opiskelijan Tampere.