15.06.1904
foundation as TuS der Farbenfabrik vorm. Friedrich Bayer & Co. 1904 Leverkusen
31.05.1907
foundation of a football-section
__.__.1923
renaming in FV 1904 Leverkusen
08.06.1928
merger with Boxverein Wiesdorf to SV 04 Leverkusen
__.__.1935
renaming in SV Bayer 04 Leverkusen
__.__.1938
merger with TuS der Farbenfabrik vorm. Friedrich Bayer & Co. 1904 Leverkusen to BSG der I.G. Farbenindustrie A.G. Bayer Leverkusen
__.__.1943
dissolution of merger
__.__.1945
renaming in SV 04 Leverkusen
__.__.1948
renaming in SV Bayer 04 Leverkusen
__.__.1984
merger with TuS 04 Leverkusen to TSV Bayer 04 Leverkusen
01.04.1999
renaming in Bayer 04 Leverkusen