Its earnings before interest, taxes, depreciation and amortisation (EBITDA) rose to 10.8 million levs in the first nine months of 2012 from 9.3 million levs in the same period a year earlier, the company said in a note to investors.
Its non-consolidated sales revenue fell to 122.1 million levs through September from 137.5 million levs a year ago.
The company cut costs for materials to 78.9 million levs in the January-September period from 82.2 million levs a year earlier.
Earnings per share rose to 0.15 levs through September from 0.10 levs in the same period of 2011.
MonBat is majority-owned by Bulgarian lubricants producer Prista Oil.
Blue chip MonBat's shares closed 0.41% lower at 4.8 levs in a volume of 3,176 on the Bulgarian Stock Exchange on Tuesday.
(1 euro=1.95583 Bulgarian levs)