This article refers to the capitalization instruments (of financing in a broad sense) provided in the General Cooperatives Law of Uruguay of 2008: the so-called Subordinated Participations and Interested Participations. We introduce the capitalization theory of cooperatives in general, and then describe and analyze some points of said Act: (i) emission requirements, (ii) legislation application on the stock market; (iii)possible categorization as securities; (iv) impact that the Income Tax may have on its viability; and(v) legal nature of theassets.