MabSelect PrismA affinity chromatography resin has been improved with an optimized high-flow agarose base matrix and a genetically engineered protein A-derived ligand. This allows future demands in mAb purification to be met, including processing of many bispecific antibodies. Enhanced dynamic binding capacity allows high mass throughput of processed mAb per resin volume unit. Excellent alkaline stability enables efficient cleaning and sanitization using 0.5–1.0 M NaOH for improved process economy, bioburden control, and robustness.The enhanced alkaline stability of MabSelect PrismA also provides opportunities for more robust mAb purification using periodic counter-current chromatography. The possibility for cleaning using 1 M NaOH increases bioburden control for continuous processes, which can be exposed to days or weeks of feed harvest.