The benchmark of Tehran Stock Exchange, TEDPIX, shed 2,521.58 points or 0.18% to close trade at 1,404,611.
Mounting pressure from sellers swept across a broad range of small caps dragging down the TSE equal-weighted index by 0.5%.
Despite the downswing, the market saw liquidity inflow by retail investors for the two straight sessions. Net capital input amounted to 1.18 trillion rials ($4.2 million) mainly into petrochemicals.
Retail traders accounted for 73% of the deals, reaching 42.6 trillion rials ($152m) -- 7% lower on the previous session.
About 4.4 billion shares worth 41.49 trillion rials ($148m) changed hands at TSE for the day.
Ardakan Industrial Ceramics Company was the biggest winner as its shares went up 5% to 16,600 rials per share.
Etebar Iran Investment Company incurred the biggest loss among all TSE-listed companies and went down 4.81% to 6,530 rials per share.
Mobarakeh Steel Company contributed the most to the benchmark's fall, followed by Tamin Petroleum and Petrochemical Investment Company, Bandar Abbas Oil Refining Company and Ghadir Investment Company.
Social Security Investment Company gave the biggest boost to the benchmark index followed by Pars Petrochemical Company, Fanavaran Petrochemical Company and Omid Investment Management Group Company.
IFX Down 0.2%
Iran Fara Bourse main index, IFX, lost 37.68 points or 0.19% to close Tuesday trade at 20,149.
About 3.94 billion securities valued at 30.7 trillion rials ($109.6m) were traded at the junior exchange for the day.
Tajali Mines and Metals Development Company had the highest number of traded shares as 1.6 billion of its shares worth 1.6 trillion rials ($5.7 million) were traded.
Iran Fara Bourse, Saba Tamin Investment Company, Arya Sasol Polymer Company and Minoo Industrial Group Company had the most negative impact on IFX.
Shahid Tondgooyan Petrochemical Company gave the biggest boost to IFX, followed by Iran Cultural Heritage and Tourism Investment Group Company, Takhte Jamshid Petrochemical Industries Company and Negin Software Systems Development Company.