Donev bought the shares through a single deal concluded on the floor of the Bulgarian Stock Exchange (BSE) on December 21, the pharmaceuticals manufacturer said in a bourse filing.
Donev has directly acquired a total of 751,976 shares in Sopharma representing 0.56% interest since the start of December.
In a separate bourse filing on Tuesday, Sopharma said that diversified group Donev Investments Holding bought 5,000 shares in the drug maker at a price of 3.14 levs apiece on December 21.
At the end of September, Donev Investments Holding was Sopharma's largest shareholder with a 25.93% stake. Donev Investments Holding is controlled by Ognyan Donev.
As at 15:00 CET on Tuesday, shares in Sopharma traded 0.63% lower at 3.18 levs on the Bulgarian Stock Exchange.
(1 euro = 1.95583 levs)