A vial of the Moderna coronavirus disease (COVID-19) booster vaccine targeting BA.4 and BA.5 Omicron sub variants is pictured at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., September 8, 2022. REUTERS/Hannah Beier

“There are different customers negotiating different prices right now, which is why it's a little bit complicated,” Hoge said ahead of a Congressional hearing run by Democratic U.S. Senator Bernie Sanders on Moderna’s pricing plans.

“There are different customers negotiating different prices right now, which is why it's a little bit complicated,” Hoge said ahead of a Congressional hearing run by Democratic U.S. Senator Bernie Sanders on Moderna’s pricing plans.

The Biden Administration has said the pandemic public health emergency will end in May, shifting price negotiations to insurers and other purchasers instead of just the federal government.

Sanders, chair of the Senate’s powerful Health, Education, Labor and Pensions Committee, has said Moderna should not raise the price of its vaccine because of the government funding it received. He plans to question Moderna Chief Executive Stephane Bancel on the price increase at the hearing on Wednesday.

Hoge said the company had more than paid back that federal support by selling a similar number of mRNA COVID vaccines as Pfizer to the government for around $3 billion less, and that Moderna had paid to ramp up its vaccine manufacturing itself.

Moderna in February forecast significantly declining 2023 COVID-19 vaccine sales, which reached $18.4 billion in 2022.

Demand for the shots has declined sharply this year due to built up product inventories around the world and increased population immunity from high rates of vaccination and previous infections.