Late last week, we noted that Rupert Murdoch bought $20 million in non-voting News Corp. shares -- reportedly his largest purchase in years -- as a “sign of his belief” in his company.

This week, Murdoch upped the ante, buying another $48 million in Class A non-voting News Corp. shares.

Reporting on the purchase, disclosed in a Monday SEC filing, the Associated Press noted: “The company reiterated a statement issued last week about [Murdoch's] earlier purchases, saying they are 'a sign of his belief in the future of the company.'”

You can view Murdoch's Monday SEC filing here.

Two of Murdoch's U.K. publications are currently mired in a high-profile phone-hacking controversy that some say threatens to undermine his multi-billion dollar takeover of U.K. satellite TV provider BSkyB, which is currently under regulatory review.

Last week the AP reported: “British police revealed Wednesday it would contact thousands of people whose cell phones may have been targeted by the News of The World tabloid, an indication of the scale of the scandal at the heart of Rupert Murdoch's media empire.”