Brent Oil Tops $90 Again as Hormuz Risk Lifts Refiners

3-line briefing

• Brent’s return above $90 is a variable that boosts expectations for inventory valuation gains for refiners on the Korean stock market, while adding raw-material pressure for airlines and chemicals.
• According to AP, Brent crude rose 2.5% on Aug. 31 to top $90 a barrel, while the S&P 500 fell 0.3% and the Dow Jones dropped 282 points.
• The Strait of Hormuz is a bottleneck through which about 20% of global crude shipments pass. This was a day when logistics risk, not war headlines, got priced in.

What changes?

From Si-hyun Kang’s perspective, what this rise in international oil prices really says is that the war premium has spread back into the discount rate. When oil rises, inflation expectations move first, and those expectations lower equity valuation multiples through the U.S. 10-year Treasury yield. AP reported that the yield on the U.S. 10-year government bonds rose to 4.75% on Aug. 31.

Tensions in the Strait of Hormuz are not just a geopolitical headline. The strait is a key route for Middle Eastern crude oil and LNG heading to Asia, and when this route becomes unstable, ship insurance premiums, freight rates, and inventory-securement costs all rise together. For countries like South Korea, which imports nearly all of its oil, demand for dollar settlement and the energy import bill increase at the same time.

The market has already priced in some of the $90 oil move. But the part not yet fully reflected is duration. If Brent stays above $90, refiners gain short-term inventory valuation gains, while airlines and petrochemical companies see their cost ratio rise with a lag.

Looking at the numbers and context

According to AP, the U.S. military struck an Iranian rocket launch site near the Strait of Hormuz on Aug. 30. It was reported as the first military action in a month. The next day, Brent rose 2.5% to move back above $90 a barrel, and energy stocks reacted with Exxon Mobil up 2.1% and Chevron up 1.5%.

The stock market reaction that same day was the opposite. The S&P 500 fell 0.3% and the Nasdaq slipped 0.1%. That is because higher oil prices are positive for energy companies’ earnings, but for the broader market they are a signal that inflation and interest-rate pressure are coming back. KOSPI cannot avoid this structure either. If the won weakens, refiners’ defense of dollar revenue improves, but cost pressure appears sooner for airlines, chemicals, and transportation.

Beneficiaries and losers

• S-Oil: Higher international oil prices lift the value of held inventory and expectations for refining margins. However, if crude input costs rise faster than product prices, spreads can narrow.
• SK Innovation: The refining segment benefits from the rebound in oil prices. Because the company also has batteries and chemicals, the positive effect of higher oil prices can be diluted by business segment.
• GS: Expectations for the value of its GS Caltex stake and an improving refining cycle are linked. Dividend expectations gain support when refining margins hold up.
• Korean Air: Oil prices flow directly into jet fuel costs. Even if passenger demand remains firm, quarterly margins are squeezed if fuel surcharges are passed through slowly.
• LG Chem: When naphtha-based petrochemical feedstock costs rise, pricing power becomes more important. In periods of weak China demand, higher costs delay earnings recovery.

Risk check

• If Brent falls back below $90 a barrel quickly, expectations for refiners’ inventory valuation gains will fade.
• If disruptions to transit through the Strait of Hormuz continue, freight and insurance costs will hit corporate cost structures before oil prices do.
• If the U.S. 10-year yield rises above 4.75%, valuation pressure will increase for growth stocks and cyclical stocks.
• If higher oil prices pass through to consumer inflation, expectations for Fed rate cuts will retreat, and foreign investors’ supply-demand (order flow) in the Korean stock market could also weaken.

Bottom line in one sentence

This rise in international oil prices is a short-term positive catalyst for refiners, but if $90 oil lasts longer, it becomes an asymmetric variable that returns to the Korean stock market as interest-rate and cost pressure.

Frequently asked questions

Why do refiners rise when international oil prices go up?

When international oil prices rise, the valuation of a refiner’s crude and product inventories increases. In periods when product prices are reflected faster than crude input costs, expectations for refining margins also rise.

How does Strait of Hormuz risk affect the Korean stock market?

The Strait of Hormuz is a route through which about 20% of global crude shipments pass. If transit disruption widens, South Korea’s crude import bill, transport costs, and dollar-settlement burden all rise at once, which can lower margins for energy-consuming industries other than refiners.

Why is $90 oil a burden for airlines?

Airlines have a cost structure with a high jet fuel share. If international oil prices stay above $90, quarterly operating profit margins come under pressure even if some of the increase is passed through via fuel surcharges.

This article is automatically summarized and analyzed based on the original news report. View original (AP News)