Together with three Norwegian business partners, he acquired a majority stake in the Norwegian owned, but Finnish based, forest company, Ab W Gutzeit & Co. Later the same year, Allan Hjelt and his partners sold the stake to the Finnish government. This was the largest business deal made in Finland during the period 1914-1924.
In the mid 1920’s Allan Hjelt’s exchange broker company collapsed due to the variations in value of the Finnish currency after the war. Allan lost most of his fortune.
Around the same time, Allan Hjelt started doing business with Italy, where he predominantly sold wood products to the Italian market. In 1924 he was nominated as Italy’s Counsul General in Finland (his villa at Fabriksgatan 32 in Helsinki serves today as the Italian Ambassador’s Residence).
Towards the end of his life, Allan Hjelt served as Finland’s trade negotiator, attached to the embassy in Bern in Switzerland, negotiating trade deals in the midst of World War II between Finland and various other nations.