Ambrx Biopharma (AMAM) Sees Hammer Chart Pattern: Time to Buy? Posted byZacks Equity Research December 29, 2021 Leave a comment on Ambrx Biopharma (AMAM) Sees Hammer Chart Pattern: Time to Buy? Ambrx Biopharma (AMAM) has been struggling lately, but the selling pressure may be coming to an end soon.