Consolidated sales revenue rose to 1.1 billion levs in the January-September period from 1.06 billion levs a year earlier, Petrol said in a filing with the Sofia bourse.
At the end of September, Petrol had 342 filling stations and employed 2,372 people.
Petrol's shares were traded flat at 6.0 levs by 1429 GMT on Thursday on the Bulgarian Stock Exchange.
(1 euro = 1.95583 Bulgarian levs)