The trading house had ownership in number of companies, including Aura Sugar Refinery, in which Dahlström worked as manager.

[2] Dahlström founded energy company Oy Electron Ab in 1898 together with another local businessman Henning von Rettig.

[1] In 1905, the brothers founded steam shipping company Transito Ab which focused on timber and coal transportation.

At the same time they participated in founding insurance companies Fennia, Verdandi and Sampo, in which they also worked in management positions.

Donations by Dahlström brothers had an important role in 1919 at founding Åbo Akademi, the Swedish speaking university of Turku.

[2] While the art museum and university were the most significant donations, the brothers also supported individual students and public health work.