Donnelley & Sons Co (NYSE:RRD) announced on Monday that it had identified a systems intrusion in its technical environment, while mentioning that currently, it is not able to determine the extent of the material adverse impact as the investigation is still in its early stages.

The company immediately performed a number of containment measures, including activating its incident response protocols, shutting down its servers and systems, and is actively engaged in implementing appropriate remedial actions in order to restore the affected systems and return to normal levels of operations.