Donev sold the shares on the floor of the Bulgarian Stock Exchange on December 1, 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 September, Sopharma held a 76.09% stake in Sopharma Trading, while Donev held directly a stake of under 5%.
As at 15:10 CET on Wednesday, Sopharma Trading shares traded 0.85% lower at 5.85 levs on the Bulgarian Stock Exchange.
(1 euro = 1.95583 levs)