APA and Occidental dropped 6%, Exxon Mobil and Chevron about 4%, and ConocoPhillips 3% in midday trading after the report.
The move suggested traders expected any agreement to ease Middle East tensions and reduce risks to oil supply, weighing on shares of major US producers.
The decline came amid a broader earnings-driven trading session in which chip, healthcare and industrial stocks posted sharp gains while several technology and energy names fell.
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