In the 1930s Capogrossi participated to many group exhibitions in Rome, Venice and Milan and Paris, usually as associate to the so-called "Scuola romana" ("Roman school").
In 1930 he was invited to show at the 23rd edition of the Venice Biennale; In 1933 he signed with Emanuele Cavalli and others the "Manifesto del Primordialismo Plastico" (The Plastic Primordialism Manifest) and in 1934 he was one of the artists invited to the exhibition the "Exhibition of Contemporary Italian Painting" at the Western Art Museum in San Francisco.
[1] In 1950 he was one of the founders of Gruppo Origine, together with Mario Ballocco, Alberto Burri and Ettore Colla in Milan.
Capogrossi subsequently became one of the main exponents of Italian informal art, together with Lucio Fontana and Alberto Burri.
Capogrossi participated in the Premio Bergamo in 1939, 1940 and 1942, and in exhibitions such as the first edition of Documenta in Kassel (1955) and the third and fifth São Paulo Art Biennial in 1955 and 1957.