Donev sold the shares on the floor of the Bulgarian Stock Exchange on September 29, Sopharma Trading said in a bourse filing.
Donev is also the CEO and indirectly the biggest shareholder of Sopharma Trading's majority owner - drug maker Sopharma [BUL:3JR].
At the end of June, Sopharma held a 74.47% stake in Sopharma Trading, while Donev owned directly a stake of under 5%.
Sopharma Trading shares closed 4.85% higher at 5.40 levs on the Bulgarian Stock Exchange on Wednesday.
(1 euro = 1.95583 levs)