FRANKFURT (Reuters) -BioNTech said on Thursday that its collaboration with Pfizer ( PFE ) has not changed, when asked to comment on a report that Pfizer ( PFE ) is looking to sell its stake in the German biotech firm.

"We continue to have a close and strong collaboration," a spokesperson said in a statement, adding that BioNTech would not be commenting on any capital market activities by Pfizer ( PFE ).