Shares Of Newly Public Company FireEye Have Gone Nuts, And They've Turned This Man Into A Billionaire

In the past few days, shares of security company FireEye have gone absolutely bonkers, turning the company's founder into an instant billionaire.

FireEye hit a high of $96 at the close of market Wednesday, though they are dropping today, down to about $92 at the time of publication.

Shares were up incredible 377% over its IPO price of $20 from just six months ago, in September.

The spike is so tempting, the company will cash in with a secondary offering that hits on Friday. It's selling another 5,582,215 shares. Should today's price hold, that will put about $514 million into its coffers, more than the roughly $300 million it raised with its IPO.

Other stakeholders are cashing in, too. They'll be selling 8,417,785 shares of their own. At $92 a pop, these investors and execs will nab $774 million.

All of it has been an insane ride for FireEye's founder and largest stakeholder, Ashar Aziz.

He owns a 7.8% stake with 10,835,000 shares, worth just over $1 billion when the share price reached $93. He's also one of the people cashing out, selling 1,043,904 of his shares, according to SEC documents.

The even bigger winners are VC firms Sequoia and Northwest Ventures, each with a roughly 15% stake and about 21 million shares.

So, what's going on with FireEye? A few things:

• The company's flagship product solves a really hard computer security problem. It is able to stop hack attacks that were previously almost impossible to stop.
• FireEye bought another security firm, Mandiant, for $1 billion. Mandiant was famous for uncovering links between Chinese hackers and attacks on U.S. companies.
• With Mandiant, FireEye launched a cloud computing security service that competes with SourceFire. SourceFire is the company Cisco bought last summer for $2.7 billion.
• The company beat expectations on its fourth quarter with revenue of $57.3 million, a beat by $1.26 million, and EPS of $-0.35, a beat by $0.03.
• Some Wall Street analysts have been really gung ho on the company. Wells Fargo started tracking it a month ago, saying it was "a once in a decade opportunity to invest in a truly disruptive technology."

But the high share price, and Aziz's newfound billionaire status, might not last that long.

FireEye issued light guidance for its Q1 of $70-$72 million and EPS of -$0.51 to -$0.56, below the $76.2 million and -$0.37 EPS analysts wanted. And it issued light EPS guidance for the next full year of -$2.00 to -$2.20, well below what analysts wanted to hear, -$1.42.

Plus, share prices are starting to drop today already, thanks to this soon-to-come flood of new shares. Prices have dropped to just below $92 so far, which makes Ariz's stake worth just under $1 billion.