MCK ▼ -0.0% - McKesson Corporation $MCK - ShinyHunters has leaked the data of McKesson Corporation McKesson shares were flat on the day following reports that the ShinyHunters group has leaked data belonging to the pharmaceutical distributor, though the market's muted reaction suggests investors were either already aware of the breach or view the impact as contained at this stage. 03-SEP-2026 12:30 PM ET