Under unrelenting sell-side pressure, the benchmark of Tehran Stock Exchange, TEDPIX, lost the psychological support level of 1.3 million points.
The main index shed 30,506 points to plunge 2.34% recording the biggest daily decline in three months. TEDPIX closed the session at 1,275,966 points, the lowest since July.
Od the total active tickers only 23 gained on Tuesday and 461 lost, representing 94% of the total.
With retail investors hanging on the sell-side, retail trade rose 17% compared to the session before to reach 27.62 trillion rials ($102 million) accounting for 68% of the total trade.
Net capital outflow by retail investors stood at 7 trillion rials ($25m) -- the highest in three months. Capital outflow has become a permanent feature in the past 19 consecutive sessions.
An estimated 5.64 billion shares valued at 30.05 trillion rials ($107m) changed hands at TSE for the day. Iran Manganese Mining Company was the biggest winner as its shares went up 4.68% to 9,850 rials per share.
Tuka Steel Investment Company incurred the biggest loss among all TSE-listed companies and went down 5% to 6,080 rials per share.
Mobarakeh Steel Company contributed the most to the benchmark's decline, followed by the Persian Gulf Petrochemical Industries Company, Golgohar Mining and Industrial Company and National Iranian Copper Industries Company.
Pasargad Bank gave the biggest boost to the benchmark index followed by Niroo Investment Company, Iran Manganese Mining Company and Novin Investment Bank.
IFX Down 1.2%
Iran Fara Bourse main index, IFX, lost 220.63 points or 1.23% to close Tuesday trade at 17,656. About 1.39 billion shares and securities valued at 22.23 trillion rials ($79.4m) were traded at the junior exchange for the day.
Kerman Province Development Investment Company had the highest number of traded shares as 175.17 million of its shares worth 141.81 billion rials ($506,471) were traded.
Zagros Petrochemical Company, Hormozgan Steel Company, Gohar Zamin Iron Ore Company and Shahid Tondgooyan Petrochemical Company had the most negative impact on IFX.
Saman Insurance Company gave the biggest boost to IFX, followed by Iranian Reinsurance Company, Minoo Industrial Group Company and Afranet Company.