The pact was subsequently joined by Hungary (20 November 1940), Romania (23 November 1940), Slovakia (24 November 1940), and Bulgaria (1 March 1941).
Pakta tersebut kemudian ditandatangani selajnutnya oleh Hongaria (20 November 1940), Rumania (23 November 1940), Slowakia (24 November 1940), dan Bulgaria (1 Maret 1941).