Automobile companies founded by and associated with the Ceirano brothers, Giovanni Battista Ceirano, Giovanni Ceirano, Matteo Ceirano and Ernesto Ceirano and their descendants.
| Year | Name | Founder | Description | Marque | |
|---|---|---|---|---|---|
| 1898 | Ceirano & C. | Giovanni Battista Ceirano | Welleyes (the technical basis of F.I.A.T.). The first motorcar Ceirano designed and built was the Well-Eyes. He sold the rights to Giovanni Agnelli of F.I.A.T. who manufactured it in volume as their first motor car. | Ceirano | |
| 1901 | Fratelli Ceirano & C. | Giovanni Battista Ceirano & Matteo Ceirano | Ceirano |  | |
| 1904 | Società Torinese Automobili Rapid | Giovanni Battista Ceirano | Rapid |  | |
| 1904 | Itala Fabbrica Automobili | Matteo Ceirano | Itala |  | |
| 1905 | Junior F.J.T.A. Fabbrica Junior Torinese d'Automobili | Giovanni Ceirano | Junior | ||
| 1906 | Società Piemontese Automobili | Matteo Ceirano | SPA |  | |
| 1906 | Società Ceirano Automobili Torino | Giovanni Ceirano | SCAT |  | |
| 1917 | Ceirano Fabbrica Automobili | Giovanni Ceirano & Giovanni "Ernesto" Ceirano | Ceirano |  | |
| 1923 | SCAT-Ceirano | Giovanni Ceirano | Ceirano | | |
| 1920 | Societa Italiana Ferrotaie (Turin 1920-1922) Fabbrica Anonima Torinese Automobili (Turin 1922-1933) | Secondary involvement by Giovanni Ceirano & Giovanni "Ernesto" Ceirano | Aurea |
