The blue-chip SOFIX, which tracks the 15 most liquid shares on the Bulgarian Stock Exchange (BSE), edged down 0.44% to 318.51 points following a similar decrease on Tuesday.
The broader BG40, which includes the 40 most traded shares, fell 0.25% to 116.30 points after rising by 0.15% in the previous trading session.
Total turnover on the regulated market fell to 358,976 levs ($237,000/184,000 euro) from 2.4 million levs on Tuesday.
Four of the 11 SOFIX components advanced, two fell and five ended flat on Wednesday.
Central Cooperative Bank (CCB) [BUL:4CF] led the SOFIX gainers, closing 1.64% higher at 0.559 levs as 130 shares changed hands.
Tobacco group Bulgartabac Holding [BUL:57B] was the top blue-chip decliner, closing 2.98% lower at 65 levs in a volume of just 18 shares.
The BG-REIT index, which tracks the performance of real estate investment trusts, ended 1.61% higher at 79.52 points after rising by 0.90% on Tuesday.
The BG TotalReturn30, in which companies with a free float of at least 10% have equal weight, rose 0.76% to 249 points following a 0.13% increase in the previous trading session.
The CGIX Corporate Governance index, which includes companies strictly applying corporate governance principles, gained 0.87% to 75.58 points. It lost 1.77% on Tuesday.
(1 euro = 1.95583 Bulgarian levs)