The blue-chip SOFIX index, which tracks the 15 most liquid shares on the Bulgarian Stock Exchange (BSE), ended flat at 337.44 points after rising by 1.09% on Friday.
The broader BG40, which includes the 40 most traded shares, went up 0.17% to 123.03 points after losing 0.65% in the previous trading session.
Total turnover on the regulated market rose to 1.9 million levs ($1.3 million/971,000 euro) from 1.3 million levs on Friday.
Five of the 13 SOFIX components which were traded on Friday rose, as many fell and three ended flat.
Mineral extracting and processing company Kaolin [BUL:6K1] was the top SOFIX gainer, closing 9.83% higher at 2.57 levs, as 18,735 shares changed hands.
Industrial Holding Bulgaria [BUL:4ID] led the blue-chip decliners, closing 11.76% lower at 0.6 levs in a volume of 16,400 shares.
The BG-REIT index, which tracks the performance of real estate investment trusts, ended 0.01% higher at 79.06 points after falling by 0.54% on Friday.
The BG TotalReturn30, in which companies with a free float of at least 10% have equal weight, edged down 0.08% to 250.75 points after falling by 0.63% in the previous trading session.
The CGIX Corporate Governance index, which includes companies strictly applying corporate governance principles, ended 0.95% higher at 75.22 points after falling by 0.68% on Friday.
(1 euro = 1.95583 Bulgarian levs)