TREY's membership includes all the undergraduate student who study at Tampere University.

The number of members is 19,000 making TREY the second largest student union in Finland.

In total, TREY has approximately 18,000 members, who study in Tampere, Turku, Pori and Seinäjoki.

The council appoints the Executive Board, which decides on the day-to-day operations of the student union.

For the purpose of providing daily services and doing long-term advocacy work, the student union employs a number of specialists and office staff.

The student union has policy outlines decided by the Council of Representatives, within the framework of which advocacy work is carried out.

International Representatives Group (4) Hallintotieteiden liitto (2) MEMES – Master Edators of Matter, Energy and Stuff (1) Luuppi_Puolue (1) Viva – Tampereen yliopiston vihreä vasemmisto (6) Vihreä lista (5) Kontakti (4) Pro Kasvatustieteilijät (2) The member services provided by the student union are accessible to all members and associations.