Sony's shares have dropped 5 percent following this week's revelation that personal information and potentially credit card details had been compromised following the hacking of PlayStation Network.
Shares fell in the company earlier this morning by 4.8 percent, which is up in a broader market by 1.3 percent. It's the biggest share loss at Sony since mid-March.
Shares have fallen by 8 percent this week.
Chairman and founder of the Ponemon Institute, Larry Ponemon, said Sony could face a hefty payout of $1.5 billion, or $20 on average for each member of the 77 million PSN userbase, over what has happened this week.
PSN was pulled last week following an "external intrusion."