Between 1820 and 1821, he also facilitated one of history's largest art sales on behalf of his close associate Edward Solly.

In 1822, he settled in Norway, after he had bought Blaafarveværket (The Blue-Colour Works) on behalf of a consortium led by the Berlin banker Wilhelm Christian Benecke.

Most of his business activities, both in the timber, grain and cobalt segments, focused heavily on export to England, where he spent much time throughout his life.

Benjamin Wegner received a solid commercial education and joined a leading Königsberg firm as an apprentice.

On behalf of his friend and close business associate Edward Solly, he also negotiated the agreement to sell Solly's unprecedented art collection of around 3,000 paintings—mainly Italian Trecento and Quattrocento paintings and Early Netherlandish paintings—to the Prussian king Frederick William III in 1821, of which 677 paintings formed the core of the collection of the new Gemäldegalerie.

Edward Solly wanted to buy the company and send Wegner as his representative to complete the transaction, but as he had financial problems, the plans had to be canceled.

Wegner subsequently bought the company at a public auction on behalf of an investment group of which Benecke was the prime investor.

The main export market was England and the company's largest customer by far was the London firm Smith, Goodhall & Reeves.

[5] As a consequence of the economic crisis following the revolutions of 1848 and also of the invention of the synthetic ultramarine colour, Modums Blaafarveværk went bankrupt in 1849.

His co-owners included Benecke and Herman Wedel Jarlsberg, and subsequently Thorvald Meyer and Westye Egeberg.

[4] She was a member of the Berenberg banking dynasty of Hamburg, one of the city's most prominent Hanseatic families, and was the daughter of the banker L.E.

Benjamin Wegner was the grandfather of the lawyer, county governor and chief of police Benjamin Wegner (1868–1949), of the humanitarian and women's rights leader Olga Wegner (the wife of the Chief Justice of the Supreme Court Karenus Kristofer Thinn), of the internationally noted war correspondent Benjamin Wegner Nørregaard, of the noted lawyer, President of the Norwegian Bar Association and founder of the law firm Hjort Harald Nørregaard, of the wine merchant and consul in Tarragona Ludvig Nørregaard, of the surgeon and President of the Norwegian Red Cross Nikolai Nissen Paus, of the lawyer and Director at the Norwegian Employers' Confederation George Wegner Paus and of the engineer and industrial leader Augustin Paus.