Tim Armstrong, chief executive of AOL, tells CNBC that Verizon is working with Yahoo to understand the scope of the data breach.
Some of the names on the move ahead of the open.
AOL CEO Tim Armstrong is hesitant to discuss Yahoo's recent security breach.
Yahoo CEO Marissa Mayer has known that Yahoo was investigating a serious data breach since July, but withheld the information, report says.
Jeremy Kroll, cybersecurity expert, K2 Intelligence CEO weighs in on Yahoo being hit by a massive hack attack and keeping cyber hygiene.
The U.S. government needs to clearly enunciate a policy that protects more critical systems from hackers, an expert said.
CNBC's Eric Chemi reports the latest on Yahoo's data breach and how the hackers tried to sell 200 million Yahoo accounts in August.
Two sources said Twitter was looking for at least $30 billion to sell, Recode reports.
European stocks closed lower Friday as investors paused for breath after recent gains.
Walter Isaacson, Aspen Institute president weighs in on rising hack attacks.
Yahoo confirmed today that 500 million user accounts were hacked, according to Recode.
The two-year gap between the initial data breach to Yahoo's public announcement is an unacceptably long time, says IBRS Advisor James Turner.
It's uncertain whether Yahoo was unaware of the data breach for two years or if it just didn't inform people, says Moor Insights & Strategy's Patrick Moorhead.
It's hard to trace state-sponsored hackers as the data are not sold for profit but for intelligence gathering, says Tinfoil Security's Michael Borohovski.
CyberArk CEO Udi Mokady says there are very low risks of getting caught and high rewards in digital assets, especially individuals' data points.
Yahoo confirmed on Thursday that information associated with at least 500 million user accounts was stolen.
After admitting it was the victim of what is likely the largest data breach ever recorded, Yahoo faces intense scrutiny.
Kara Swisher, Recode, discusses Yahoo's data breach of 500 million user accounts, as well as possible repercussions.
Yahoo confirmed a hack affecting up to 500 million accounts. Here's what companies need to do after a major data breach.
Yahoo says information from some 500 million users was stolen. The company says stolen information may include names and emails.