Shares of Saudi state oil company Aramco fell below their initial public offering (IPO) price on Sunday for the first time since they began trading in December after the OPEC oil supply cut pact with Russia fell apart on Friday.
Aramco shares were trading at 31.10 riyals ($8.29) at 0724 GMT, down 5.8 percent, and below the IPO price of 32 riyals.
The Saudi market plunged 7 percent in early trade.
Aramco's record IPO in December had valued the firm at $1.7 trillion, making it the world's most valuable company. It hit an intraday high of 38.70 riyals on its second day of trading, but the stock price has eased since then on valuation concerns.
Aramco stock is down more than 11 percent since the start of the year as concerns mounted the coronavirus outbreak will slow oil demand from China and hurt the global economy.
"Aramco is under pressure because of the failure of the deal," said Marie Salem, head of institutions at Daman Securities. "We have already seen the impact on the local markets and we do not expect those to be different in Saudi."
Other Gulf markets were also in the red. The Abu Dhabi stock index was down 5 percent and the Dubai index had slumped 7.7 percent in late morning trade.
A three-year pact between OPEC and Russia ended in acrimony on Friday after Moscow refused to support deeper oil cuts to cope with the coronavirus outbreak and OPEC responded by removing all limits on its own production.
The news pushed Brent futures to their biggest daily percentage fall on Friday since December 2008, down 9.4 percent, or $4.72, to settle at $45.27 a barrel. It was Brent's lowest closing price since June 2017.
Saudi Arabia is the de facto leader of the Organization of the Petroleum Exporting Countries and the world’s biggest oil exporter.
Jaap Meijer, head of equity research at Arqaam Capital, said investors in Aramco should be sheltered by the guaranteed dividend streams, as the government will scale back its own dividend payments to protect the minority shareholders.Aramco has planned a dividend of $75 billion for 2020, more than five times larger than Apple Inc's payout, which is already among the biggest of any S&P 500 company.