Bayer attempted a Hail Mary pass a month ago when they donated three million hydroxycholorquine tablets to the USA for the purpose of fighting against Covid-19. https://www.reuters.com/article/us-health-coronavirus-bayer/bayer-donates-three-million-malaria-tablets-to-us-for-potential-use-against-coronavirus-idUSKBN21637E
If hydroxychloroquine would have worked against the coronavirus, then Bayer would have regained their losses from 2018 and 2019. Although the drug is effective against malaria, lupus, and rheumatoid arthritis, the drug has not proven to be effective against Covid-19 in clinical trials. https://www.snopes.com/news/2020/04/03/small-trial-finds-hydroxychloroquine-is-not-effective-for-treating-coronavirus/