"Pribaikalsouz" was founded at the congress of cooperators of Western Transbaikalia, held in Verkhneudinsk from January 19 to 22, 1914. The partnership operated not under a charter, but on the basis of an agreement.
The union's main goal was to supply cooperatives oriented toward the Verkhneudinsk market with the necessary goods, carry out intermediary operations between them, purchase and sell agricultural products, establish warehouses, and open branches, trading agencies, and offices. In addition, the union could acquire factories, plants, and processing enterprises as its own property, lease and purchase movable and immovable property, and establish ties with credit, insurance, and other financial institutions.
In practice, "Pribaikalsouz" began its operations in March 1914, uniting 9 cooperative societies with capital of 509 rubles. By 1915, the capital had increased to 2,770 rubles. In 1917, the union already included 195 consumer societies, and in 1918, 226 cooperatives.
In 1917, Pribaikalsouz switched to a charter and was renamed the "Pribaikalsky Union of Cooperatives."
After the formation of the Far Eastern Republic, the cooperative movement split. "Dalsouz" and "Daltsentrosouz" were formed. "Pribaikalsouz" was part of the "Dalsouz" system. The Socialist Revolutionaries controlled "Dalsouz," while the Bolsheviks controlled "Daltsentrosouz." The chairman of the board of Pribaikalsouz until October 1922 was Socialist Revolutionary Petr Vasilevich Shatsky.
At the end of 1920, "Pribaikalsouz" merged with the Verkhneudinsk branch of the "Transbaikal Credit Union" (the union came to include 234 consumer cooperatives and 59 credit cooperatives).
On June 5, 1921, a meeting of authorized representatives approved this merger, and the Union was renamed "United Pribaikalsky Union of Cooperatives".
In 1922, in connection with the Sovietization of the Far East, the union was renamed the "Pribaikalsky Gubernia Union of Worker-and-Peasant Cooperatives."
On October 4, 1923, the bureau of the Buryat-Mongol All-Union Communist Party (Bolsheviks) decided to merge "Pribaikalsouz" and "Buroblsouz" into the "Union of Cooperative Societies of the BMASSR" (Burmongolkoopsouz, since 1953 Burkoopsouz). It was subordinate to the Central Union of Consumer Societies of the USSR.
On October 3, 1923, "Pribaikalsouz" ceased to exist.