Generic drugmaker Endo said on Friday it was manufacturing Novavax Inc’s experimental Covid-19 vaccine, sending its shares up 10% before the trading bell.

The news comes a day after Novavax launched a late-stage trial of the vaccine candidate, NVX-CoV2373, in the United Kingdom.

Endo said it has signed a deal with Novavax and its unit Par Sterile has begun production of the final drug product, with initial batches to be used in Novavax’s phase-3 clinical trial in the United States.

Financials and other terms of the non-exclusive agreement were not disclosed.

NVX-CoV2373 is currently also being tested in two ongoing mid-stage trials that began in August.