Yahoo Has Reportedly Suffered a Massive Data Breach

Verizon Communications for $4.8 billion.

Representatives at Yahoo (yhoo) and Verizon (vz) could not be reached for comment. Shares of both companies were up 0.5% in late morning trading, compared with a 0.6% increase in the Nasdaq Composite index.

If a breach is confirmed, Yahoo would likely force users to change their passwords, said Linn Freedman, a privacy attorney with Robinson Cole.