Donev bought the shares on the floor of the Bulgarian Stock Exchange, the drug manufacturer said in a stock exchange filing.
Donev has directly acquired a total of 536,255 shares in Sopharma, or 0.40% interest, since the start of December.
In a separate filing on Tuesday, Sopharma said that Donev Investments Holding acquired 304,171 shares in the company at an average price of 3 levs apiece. Donev Investments Holding is controlled by Ognyan Donev.
Also on Tuesday, Sopharma's unit Sopharma Trading said that Ognyan Donev has sold 18,510 shares in the company at an average price of 5.62 levs per share.
At the end of September, Donev Investments Holding was Sopharma's largest shareholders with a 25.93% stake, while Donev held a stake of under 5% directly. Sopharma held a 76.09% stake in Sopharma Trading at the end of September.
Sopharma shares closed 1.97% higher at 3.10 levs on the Bulgarian Stock Exchange on Tuesday, while Sopharma Trading ended 1.79% up at 5.70 levs.
(1 euro = 1.95583 levs)