US federal regulators are investigating the circumstances of Mark Hurd's forced resignation five months ago as chief executive officer of Hewlett-Packard.
HP, the world's biggest maker of personal computers, said it is co-operating with the investigation by the Securities and Exchange Commission, which was earlier reported by The Wall Street Journal.
A spokesman for Hurd said the former CEO "acted properly in all respects." The SEC declined to comment.
Hurd's ouster came after a former HP contractor named Jodie Fisher accused him of sexual harassment.
She also alleged that Hurd told her in advance about HP's 13.9 billion dollar acquisition of Electronic Data Systems in 2008, a person familiar with the matter said.
Fisher later said there were "many inaccuracies" in her claim, and she and Hurd settled.