from J. P. Suhr & Søn with a drawing of coal loading in an English port When their father died in 1815, he and his elder brother Didrik Suhr joined the management of the company which was formally owned by their mother until her death in 1842. The company went through a difficult period with the settlement of its activities in
Norway followed by an agricultural crisis but experienced new growth in the late 1820s and early 1830s. The company increasingly specialized in import of coal and iron from
Sweden and
England. In the 1830s, J. P. Suhr & Søn had a market share of more than 20% of the Danish import of coal and it later grew to 33%. The company was also active as a money lender with ties to leading bankers in
Hamburg. In 1827, Suhr moved into the industrial sector when he leased the rolling mill in
Frederiksberg. He established a production of copper plates and installed the first large, Danish-built steam engine (20 j hp) in 1828. In 1830, he acquired Brede Copper Mill (). In the 1850s, he sold those activities but continued to have investments in industrial enterprises such as
Ørholm,
Strandmøllen and M. P. Allerup. He had also investments in industrial enterprises abroad. When his mother died in 1842, Suhr became the sole owner of the company after buying out his brother and sisters. At this point he had an estimated net worth of 800,000
Danish rigsdaler and by 1853 it had doubled to 1.6 million rigsdaler. In late 1855 he ceded the company to his nephew
Ole Berendt Suhr (1813–1875) but remained active in it for another few years. ==Property==