China's three major state-owned oil companies—PetroChina (CNPC), Sinopec, and CNOOC—have recently issued announcements disclosing abnormal fluctuations in their A-share stock prices. Specifically, PetroChina's A-shares saw their closing price deviation accumulate to over 20% across three consecutive trading days on February 27, March 2, and March 3, 2026, triggering the Shanghai Stock Exchange's criteria for abnormal volatility. Sinopec and CNOOC have released similar risk advisory notices. This action represents the companies' fulfillment of information disclosure obligations in accordance with exchange regulations, aimed at reminding investors to be aware of market risks. The event directly reflects the recent market performance and regulatory compliance dynamics of listed companies within China's fossil energy sector.