NEW YORK (TheStreet) -- Shares of FireEye (FEYE) - Get Report were advancing 5.21% to $14.53 on heavy trading volume late Thursday afternoon after digital information company Yahoo (YHOO) announced that more than 500 million user accounts were breached.

FireEye is a Milpitas, CA-based cybersecurity solutions provider for detecting, preventing and resolving online data attacks.

Yahoo stock was lower in late afternoon trade as over 24.64 million shares traded vs. the 30-day average volume of 10.86 million shares.

The Yahoo breach took place in 2014 and is believed to have been enacted by a "state-sponsored actor," according to a company statement.

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Yahoo said that users' names, email addresses, phone numbers, birthdays, encrypted passwords and some security questions and answers were stolen in the hack.

The company is working closely with authorities and will contact affected users with steps to secure their accounts and information.

More than 5.79 million of FireEye shares have traded so far on Thursday vs. the 30-day average volume of 4.57 million shares.

Separately, TheStreet Ratings objectively rated FireEye stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this articles's author.

TheStreet Ratings rated this stock as a "sell" with a ratings score of D.

The company's weaknesses can be seen in multiple areas, such as its deteriorating net income, disappointing return on equity, weak operating cash flow and generally disappointing historical performance in the stock itself.

You can view the full analysis from the report here: FEYE

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