Oil refineries are the primary buyers of crude oil worldwide. They purchase it as raw material, process it into gasoline, diesel, jet fuel, and thousands of other products, then sell those finished goods downstream. But refineries aren’t the only buyers. Crude oil changes hands multiple times before it ever reaches a refinery, passing through commodity trading houses, national oil companies, government stockpile programs, and occasionally financial institutions.
Refineries: The End-User Buyers
Every barrel of crude oil ultimately exists to feed a refinery. These massive industrial facilities break crude down into lighter, more useful products through heating, chemical reactions, and distillation. A single refinery might produce gasoline, diesel, heating oil, jet fuel, lubricants, asphalt, and petrochemical feedstocks from the same barrel of crude.
Not all refineries buy the same type of oil. Crude comes in hundreds of grades that vary by density (how heavy or light it is) and sulfur content (how “sweet” or “sour” it is). A refinery’s physical equipment determines which grades it can process profitably. A complex refinery built with heavy conversion units can handle thick, sulfur-rich crude and extract more value from it, while a simpler facility needs lighter, cleaner crude to operate efficiently. The intrinsic value of any given grade can differ significantly between refineries based on their configuration. This is why you’ll see certain refineries in the U.S. Gulf Coast importing heavy crude from Venezuela or Canada, while refineries elsewhere prefer lighter grades from West Africa or the North Sea.
The world’s largest refining operations are enormous. China Petrochemical Corp (Sinopec) leads globally with a refining capacity of nearly 6 million barrels per day. China National Petroleum Corp follows at roughly 4.9 million barrels per day, and ExxonMobil rounds out the top three at about 4.7 million barrels per day. The top ten refining companies collectively average around 3.6 million barrels per day each. Phillips 66, at the lower end of that top ten, still processes over 2.2 million barrels daily.
National Oil Companies
Most of the world’s crude oil production is controlled by national oil companies, or NOCs. These are state-owned enterprises that both produce and buy crude oil. Saudi Aramco, the National Iranian Oil Company, Gazprom in Russia, and China National Petroleum Corporation are among the most prominent. Some NOCs operate across the full supply chain: they extract crude, refine it domestically, and sell finished products. Others primarily export crude to foreign buyers while importing different grades their own refineries need.
China’s NOCs are particularly active buyers on the global market. Despite significant domestic production, China imports vast quantities of crude to feed its refining sector. Sinopec and CNPC together operate the largest refining networks on the planet, and their purchasing decisions move global oil prices. India’s state-backed refiners similarly buy heavily on international markets, sourcing crude from the Middle East, Russia, and Africa to meet domestic fuel demand.
Commodity Trading Houses
Between the producer and the refinery, independent commodity trading firms often serve as intermediaries. These companies buy crude oil from producers, arrange transportation, and sell it to refineries or other buyers, profiting from the logistics and timing of each deal. They don’t typically consume the oil themselves. Instead, they add value by connecting supply with demand across geographies and timeframes.
Vitol, based in Geneva, describes itself as the market leader in crude oil and products distribution. The company operates through an extensive logistics network and holds roughly $10 billion in long-term assets. Other major trading houses include Trafigura, Glencore, Mercuria, and Gunvor. These firms handle millions of barrels daily, and their traders are constantly matching available cargoes with refineries willing to pay the best price for a particular crude grade. They also offer financing and cross-commodity arrangements to both producers and buyers.
Governments Building Strategic Reserves
Governments buy crude oil to stockpile in strategic petroleum reserves, insurance policies against supply disruptions. The United States maintains the world’s largest government-owned emergency oil stockpile, and the Department of Energy acquires crude through several channels: direct purchase on the open market, transfer of royalty oil from the Department of the Interior (oil owed to the government from production on federal lands), and receipt of “premium barrels” that result from deferring scheduled deliveries. Other countries with significant strategic reserves include China, Japan, South Korea, and members of the International Energy Agency. These purchases tend to happen opportunistically when prices are low, though political considerations also play a role.
Financial Institutions
Wall Street banks have historically been more involved in physical crude oil markets than most people realize. A U.S. Senate investigation documented how Goldman Sachs, JPMorgan Chase, and Morgan Stanley became major players in physical commodities over a ten-year period. Morgan Stanley at one point controlled over 55 million barrels of oil storage capacity, 100 oil tankers, and 6,000 miles of pipeline. The firm even supplied jet fuel directly to United Airlines.
These activities drew regulatory scrutiny due to the risks involved, and most major banks have since scaled back their physical oil operations. Morgan Stanley, for instance, exited the physical oil business. Today, financial institutions remain heavily involved in crude oil markets, but primarily through derivatives: futures contracts, options, and swaps traded on exchanges or over the counter. Their physical commodity activities now represent a relatively small share of their total commodities business.
How Crude Oil Is Actually Bought
Crude oil trades through two main types of transactions. Spot market deals involve buying oil available now (or within a few weeks) at the current market price. Forward contracts lock in a price and delivery date further in the future, with terms negotiated between buyer and seller. Until the early 1980s, long-term contracts were relatively uncommon. Oil-producing countries, recognizing their market power, largely avoided locking in prices and instead pursued the volatile but often lucrative spot market.
Both spot and forward transactions are “physical” markets, meaning their purpose is to actually exchange a commodity between a buyer and a seller. This distinguishes them from futures markets, where most participants are trading financial contracts and never intend to take delivery of actual oil.
Shipping terms also define who bears the cost and risk of moving crude from seller to buyer. Under FOB (free on board) agreements, the buyer takes on responsibility and shipping costs once the oil is loaded onto a vessel at the seller’s port. Under CIF (cost, insurance, and freight) agreements, the seller covers transportation and insurance all the way to the buyer’s port. FOB gives the buyer more control over logistics, often at a lower total cost. CIF is more convenient for the buyer but typically more expensive since the seller builds those costs into the price.
Where the U.S. Gets Its Crude
The United States, despite being a major oil producer itself, still imports significant volumes. Canada dominates U.S. crude imports at roughly 3.9 million barrels per day, dwarfing all other sources combined. Saudi Arabia follows at around 520,000 barrels per day, then Mexico at 245,000, Venezuela at 143,000, and Brazil at about 104,000. Canada’s outsized share reflects the extensive pipeline infrastructure connecting Alberta’s oil sands to U.S. Gulf Coast and Midwest refineries, many of which were specifically built or upgraded to process heavy Canadian crude.