His company's main product was cognac "Medicinal", which competed with French alternatives in the Austro-Hungarian monarchy and German Empire territory.
In 1920, after Austro-Hungarian monarchy collapsed, Stock bought a distillery factory at Plzeň Božkov (in the then Czechoslovakia).
Stock eventually came to own a network of distilleries, bottling plants and ageing facilities in Italy, Austria, Poland, Hungary and Croatia.
In later stages of World War II, Stock himself – already an old man – was persecuted along with other Jews in Trieste, but managed to survive.
[1][2] After Czechoslovakia's liberation in 1945, the Plzeň factory was momentarily returned to Stock and his family – but was nationalized in 1947 by the Czechoslovak Communist regime.