AstraZeneca is the main manufacturer of COVID-19 vaccines, while the top buyers are the EU and the United States.

According to a new study from the US, the countries of the world have signed contracts for the supply of 8.6 billion doses of coronavirus vaccines. The AstraZeneca vaccine has concluded deals for 2.4 billion doses of the vaccine. Pfizer comes in second with 1.5 billion doses. China's Sinovac will sell 480 million doses, while Russia's Sputnik V will sell 303 million doses. In 2021, vaccine manufacturers are expected to be able to produce a combined total of 12 billion doses of vaccines.

Rich countries have booked 4.6 billion doses of vaccines, according to scientists, accounting for 53% of all vaccine purchases. Countries with upper-middle incomes account for 17% of purchases, almost the same amount (16%) was ordered by countries with average and lower-middle incomes. The remainder is procurement through the UN-sponsored COVAX equitable access mechanism.

Most of the doses were reserved by the European Commission on behalf of the 27 EU countries (1.8 billion doses), followed by the United States (1.2 billion doses) and the African Union with contracts for 680 million doses.