The 3 million levs represent part of Millennium 2000's undistributed profit in 2018, Gradus said in a bourse filing.
Earlier this year, Millennium 2000 distributed 1 million levs of its profit in 2018 as dividend to Gradus.
As at 11:05 CET on Thursday, Gradus shares traded 0.59% lower at 1.69 levs on the Bulgarian Stock Exchange.
Gradus controls six units - Gradus-1, Gradus-3, Gradus-98, Lora-2004, Millennium 2000, and Zhyuliv.
(1 euro = 1.95583 levs)