The deal valued the company, which has annual revenue of €500m and profits of €19m, at €148m, said Reuters.
The sale is part of the Finnish government’s plan to divest of €1.9bn worth of assets in 2014-2015.
Ahlstrom, which is based in Helsinki, is focused on making equity investments in industrial companies.
Its portfolio businesses currently have an annual turnover of €1bn.
Recent deals in Finland include Impax Asset Management’s acquisition of wind farm Kuolavaara-Keulakkopää from Fortum and Metsähallitus.
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