Prothena (PRTA) Reports Q4 Loss, Tops Revenue Estimates Posted byZacks Equity Research February 17, 2022 Leave a comment on Prothena (PRTA) Reports Q4 Loss, Tops Revenue Estimates Prothena (PRTA) delivered earnings and revenue surprises of 4.05% and 324.64%, respectively, for the quarter ended December 2021. Do the numbers hold clues to what lies ahead for the stock?