Grandson Hugo entered the family concern in 1890 and established his own coal and shipping business in 1892, although another source dates Hugo Stinnes GmbH to 1893. He acquired interests in Woermann and Deutsche Afrika-Linien in 1916, held the Deutsche Ost-Afrika interest until 1921, and took an Ozean-Linie share in 1921. Financial difficulties after his death in 1924 led to the sale or merger of Hugo Stinnes Linien into Deutsch-Austral & Kosmos: the accounts give 1924 and 30 January 1926, while a 1925 timetable documents continuing services. The Stinnes line name remained in use.
Keep the explicit scope label independent; no alias or company identity is inferred.