Viva Energy Group Ltd's stock plummeted 7.95% during intraday trading on Wednesday, reflecting a sharp reversal in investor sentiment toward the fuel refiner and marketer.

The decline follows President Trump's announcement on Truth Social that he would suspend attacks on Iran for two weeks. While this development spurred risk-on sentiment in broader equity markets, it negatively impacted fuel refiners like Viva Energy. The ongoing Iran conflict had previously boosted refining margins, and the potential for a cease-fire, which could lead to the unblocking of the Strait of Hormuz, now risks unwinding those gains.

The market reaction highlights how geopolitical developments directly affect energy sector companies, with Viva Energy's shares falling in tandem with peer Ampol Ltd as investors reassess the profit outlook for refiners in a potentially de-escalating conflict environment.