Company

Investor FAQ

1.Where is Data Domain's corporate headquarters?
2.Where was Data Domain incorporated?
3.When did Data Domain go public?
4.What is Data Domain’s fiscal year?
5.What is the ticker symbol for Data Domain and where is the company listed?
6.Does Data Domain have a direct stock purchase plan?
7.Who is Data Domain's transfer agent or shareholder service contact?
8.Does Data Domain pay dividends?
9.Who is Data Domain's auditor?
10.Who is Data Domain's legal counsel?
11.How many Data Domain shares are outstanding?
12.How many employees does Data Domain have?
13.Who were the underwriters for Data Domain’s IPO?
14.When are Data Domain's financial results announced?
15.How can I get a copy of Data Domain’s prospectus?
16.How can I view documents Data Domain has filed with the Securities & Exchange Commission (SEC), including Forms 10-K and 10-Q?
17.How do change the address on my shareholder account or replace a lost stock certificate?
18.Who makes up the Data Domain Executive Management team and Board of Directors?
19.How can I get added to your email distribution list?
20. Whom should I contact regarding investor inquiries?
1.Where is Data Domain's corporate headquarters?
 Data Domain’s headquarters are located at 2421 Mission College Blvd., Santa Clara, CA 95054.

2.Where was Data Domain incorporated?
 Data Domain was incorporated in Delaware in October, 2001.

3.When did Data Domain go public?
 Data Domain first issued shares to the public on June 27, 2007, at a price of $15.00 per share.

4.What is Data Domain’s fiscal year?
 Data Domain’s fiscal year ends December 31.

5.What is the ticker symbol for Data Domain and where is the company listed?
 Data Domain is list on the Nasdaq stock market under the ticker symbol DDUP.

6.Does Data Domain have a direct stock purchase plan?
 Data Domain does not currently offer a direct stock purchase plan.

7.Who is Data Domain's transfer agent or shareholder service contact?
 Wells Fargo Shareowner Services
Attn: Manager of Account Administration
161 North Concord Exchange
South St. Paul, Minnesota 55075-1139
Phone: 800-468-9716
Web: www.wellsfargo.com/com/shareowner_services/contact_us

8.Does Data Domain pay dividends?
 Data Domain does not currently pay dividends.

9.Who is Data Domain's auditor?
 Data Domain's independent auditors are Ernst & Young LLP, an independent registered public accounting firm.

10.Who is Data Domain's legal counsel?
 Fenwick & West LLP

11.How many Data Domain shares are outstanding?
 Please go to the Stock Information section of our website.

12.How many employees does Data Domain have?
 Data Domain currently has more than 700 employees.

13.Who were the underwriters for Data Domain’s IPO?
 Data Domain’s initial public offering was underwritten by Goldman, Sachs & Co., Morgan Stanley, Thomas Weisel Partners LLC, Pacific Crest Securities.
Date of offering: June 27, 2007
# shares: 7 million
Price: $15.00 per share

14.When are Data Domain's financial results announced?
 If a date for the quarterly financial results release has been established, it will be listed on the home page of the investor relations sections of the website. If not date is listed, then the date has not yet been established.

15.How can I get a copy of Data Domain’s prospectus?
 A copy of the final prospectus relating to Data Domain’s initial public offering may be obtained directly from the prospectus departments of Goldman, Sachs & Co. 1-866-471-2526 or Morgan Stanley 212-761-6775.

16.How can I view documents Data Domain has filed with the Securities & Exchange Commission (SEC), including Forms 10-K and 10-Q?
 Visit the SEC Filings section of the IR website or download release and tables from the financial releases section.

17.How do change the address on my shareholder account or replace a lost stock certificate?
 Please contact Wells Fargo Shareowner Services at:
Attn: Manager of Account Administration
161 North Concord Exchange
South St. Paul, Minnesota 55075-1139
Phone: 800-689-8788
Web: www.wellsfargo.com/com/shareowner_services/contact_us

18.Who makes up the Data Domain Executive Management team and Board of Directors?
 Please go to the Management section of our website.

19.How can I get added to your email distribution list?
 Please go to the E-mail Alerts section of our website.

20. Whom should I contact regarding investor inquiries?
 Ed Luboja, Director of Communications
Data Domain
Phone: (408) 980 - 4909
Email: ir@datadomain.com