Canadian energy stocks took a significant hit Tuesday after Iran declared the Strait of Hormuz open to commercial shipping, reversing the supply-disruption premium that had been built into crude prices. Suncor Energy (TSX: SU) fell approximately 4%, Cenovus Energy (TSX: CVE) shed 5.4%, and Canadian Natural Resources (TSX: CNQ) dropped 7.28%. Strathcona Resources slid 4.7% and Kelt Exploration lost 4.4%. The TSX energy subgroup finished as the session’s worst-performing sector, declining 2.8% on the day.

The selloff was directly triggered by Iran’s Foreign Minister confirming full commercial access through the Strait of Hormuz for the ceasefire’s duration. Oil had surged above US$110 per barrel at the height of Middle East tensions in early 2026, providing a substantial windfall for Canadian oil sands producers. With that geopolitical premium now deflating, oil prices pulled back sharply, compressing the near-term earnings outlook for energy names that had been pricing in sustained triple-digit crude.

For investors who entered the energy trade during the conflict escalation, the sharp pullback raises questions about how much of the premium remains justified. CNQ had already fallen roughly 8.9% from its all-time high reached on March 20 before Tuesday’s session, suggesting the correction is accumulating. However, it is worth noting that even below US$100 per barrel, most Canadian integrated producers remain profitable given the cost efficiencies implemented in recent years. Suncor, for instance, reported record quarterly production and refining volumes in its last earnings period.

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The key variable to monitor is whether the ceasefire holds. A breakdown in the agreement or renewed conflict in Iran could rapidly reverse Tuesday’s losses in energy names. Investors should also track Brent and WTI spot prices for confirmation that the supply premium is fully unwound before re-entering the sector.

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Long-term fundamentals for Canadian oil sands remain intact; the short-term trade is purely driven by geopolitical volatility.