The Sofia bourse was closed on May 1, Labour Day. May 3 and May 6 will also be non-working days.
The blue-chip SOFIX, however, managed to add 0.01% to 813.65 points, supported by gains in First Investment Bank [BUL:FIB], bourse data showed.
First Investment Bank, or Fibank, jumped 10.71% to 3.1 levs, as 54,866 shares changed hands, making it the most liquid share.
In the losers department, hydraulic equipment manufacturer M+S Hydraulic [BUL:MSH] lost 3.39% to 11.4 levs, while diversified group Chimimport [BUL:CHIM] shed 1.46% to 0.68 levs.
The two companies, alongside venture capital firm Eleven Capital [BUL:11C] and fertiliser producer Neochim [BUL:NEOH, weighed on the BGBX40, which tracks the 40 most traded shares on the Sofia bourse, and it closed 0.15% lower at 165.13 points.
The BGREIT, which tracks seven real estate investment trusts, ended 0.06% lower at 189.39 points, held back by the poor performance of Advance Terrafund REIT [BUL:6A6]. Advance Terrafund lost 0.30% to 3.34 levs.
The BEAMX index, which tracks the ten most highly capitalised growth companies, went down 0.82% to 96.67 points, after a 22.69% collapse in electric vehicle manufacturer Sin Cars Industry [BUL:SIN], to 0.40 levs.
The BGTR30 index, in which companies with a free float of at least 10% have equal weight, inched down 0.02% to 817.49 points.
Total turnover on the main market of the Sofia bourse swelled to 1.2 million levs ($656,349/613,550 euro) on Thursday from 361,523 on Tuesday.
(1 euro = 1.95583 levs)