Tehran Stock Exchange's main index, TEDPIX, lost 10,285.44 points or 0.57% on Monday to end at 1,785,669.75 but the TSE equal-weighted index gained 0.13%.
About 11.65 billion shares worth 75.5 trillion rials ($167.8 million) changed hands for the day. Trading at TSE and over-the-counter Iran Fara Bourse starts on Saturday and ends Wednesday.
Behsaz Kashane Tehran Construction Company led the winning side as its shares climbed 6.98% to 2,053 rials per share.