<div id="readability-page-1"><div>By Sherry Qin China's oil majors simultaneously issued trading-volatility alerts, after their shares surged on the escalating Middle East conflict that is disrupting oil supply. Shanghai-listed PetroChina, Cnooc Ltd. and China Petroleum &amp; Chemical Corp., better known as Sinopec, issued the alerts late Tuesday and reminded investors of trading risks. PetroChina said its &#34;share price increased by more than 20% in the three consecutive sessions from Feb. 27 to March 3,&#34; adding that oil prices could fluctuate as the oil market is affected by geopolitical conditions and supply-demand dynamics. Sinopec and Cnooc cited similar reasons in their alerts. The widening Middle East conflict has halted traffic through the Strait of Hormuz, a chokepoint for energy markets, sending front-month Brent more than 10% higher so far this week. Brent was up 1.4% at $82.54 a barrel in early Asian trading Wednesday, while West Texas Intermediate crude was up 1.2%. Analysts said that a prolonged conflict could propel oil prices to $100 a barrel and push up global inflation. Shanghai-listed shares of the &#34;Big Three&#34; plunged on Wednesday morning following the warnings. PetroChina shed 3.65%, Sinopec was 6.8% lower and Cnooc declined 4.0%. Write to Sherry Qin at sherry.qin@wsj.com (END) Dow Jones Newswires03-03-26 2118ET</div></div>

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China's major oil companies, including PetroChina, Cnooc, and Sinopec, issued trading alerts after their stocks surged due to the escalating Middle East conflict affecting oil supply. PetroChina reported a 20% increase in share price over three sessions, while oil prices rose significantly, with Brent crude reaching $82.54 a barrel. However, following the alerts, shares of these companies fell sharply, with PetroChina down 3.65%, Sinopec down 6.8%, and Cnooc down 4.0%. Analysts warn that prolonged conflict could drive oil prices to $100 a barrel and increase global inflation.

China's 'Big Three' Oil Majors Issue Trading Alerts Following Stock Surges