Crude Oil Prices: Valero's profitability relies heavily on the price of crude oil, its primary raw material. Higher crude oil prices can squeeze margins if refined product prices don't rise proportionally.

Refining Margins: The difference between the price of crude oil and refined products like gasoline and diesel is crucial. Wider margins boost Valero's earnings, while narrower margins hurt them.

Demand for Refined Products: Economic growth and consumer behavior influence demand for gasoline, diesel, and jet fuel. Increased demand typically supports higher prices and better refining margins.

Refinery Capacity and Utilization: The availability of refining capacity and how efficiently Valero operates its refineries affect supply and, therefore, prices. Unexpected shutdowns can reduce supply and increase prices.

Government Regulations: Environmental regulations, mandates for renewable fuels, and tax policies can significantly impact Valero's operating costs and profitability.

Inventory Levels: High inventory levels of crude oil or refined products can put downward pressure on prices, while low inventories can support higher prices.

Geopolitical Events: Political instability, conflicts, or trade disruptions in oil-producing regions can cause volatility in crude oil prices and impact Valero's business.

Economic Conditions: Overall economic health, including inflation and interest rates, influences consumer spending and industrial activity, thereby affecting demand for refined products.

Company-Specific Factors: Valero's management decisions, investment strategies, and operational performance relative to its peers influence investor sentiment and stock price.

Interest Rates: Higher interest rates can increase Valero's borrowing costs and potentially slow down economic growth, impacting demand for refined products.