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Proofpoint Named Among 2012 Fastest Growing Private Companies by Silicon Valley Business Journal

SUNNYVALE, CA — (Marketwire) — 10/12/12 — Proofpoint, Inc. (NASDAQ: PFPT), a leading security-as-a-service provider, today announced that it has been named one of the Silicon Valley Business Journal-s Fastest Growing Private Companies. Ranked 58, Proofpoint was presented the award on the evening of Thursday, October 11, at a ceremony at the Computer History Museum in Mountain View.

The Fastest Growing Private Companies (“Fast Private”) awards recognize companies in the Silicon Valley with the highest percentage increase in net revenue from 2009-2011. All listed companies had sales of more than $200,000 in fiscal year 2009 and were in business throughout that entire fiscal year. Proofpoint, which began trading publicly on the NASDAQ in April 2012, qualified for the Fast Private awards as nominations took into account financial performance through the end of the most recent fiscal year, when Proofpoint was still a private company.

“We are proud to have been recognized among the fastest growing companies in the Silicon Valley,” said Gary Steele, CEO of Proofpoint. “As a newly public company, the award demonstrates our long-standing strength and steady growth, which we will build upon as we continue to innovate and deliver data protection, archiving and governance solutions to our customers across the globe.”

The full list of honorees will be published in the Silicon Valley Business Journal-s October 12 edition, or can be viewed here: .

Proofpoint, Inc. (NASDAQ: PFPT) is a leading security-as-a-service provider that focuses on cloud-based solutions for threat protection, compliance, archiving & governance and secure communications. Organizations around the world depend on Proofpoint-s expertise, patented technologies and on-demand delivery system to protect against phishing, malware and spam, safeguard privacy, encrypt sensitive information, and archive and govern messages and critical enterprise information. More information is available at .

Proofpoint is a trademark or registered trademark of Proofpoint, Inc. in the U.S. and other countries. All other trademarks contained herein are the property of their respective owners.

Orlando De Bruce
Proofpoint, Inc.
408-338-6870

Lisette Paras
Ogilvy Public Relations
415-677-2771