Cloudmark, Inc is a privately held company

Privately held company

A privately held company or close corporation is a business company owned either by non-governmental organizations or by a relatively small number of shareholders or company members which does not offer or trade its company stock to the general public on the stock market exchanges, but rather the...

, San Francisco-based, providing protection against spam, viruses, phishing, and similar threats that affect email

Email

Electronic mail, commonly known as email or e-mail, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks. Some early email systems required that the author and the recipient both be online at the...

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Cloudmark claims to protect about one billion subscribers for the world's largest carrier networks, including over 75 percent of all major service providers in the United States and Japan. Its client reference list includes: Cablevision, Comcast

Comcast

Comcast Corporation is the largest cable operator, home Internet service provider, and fourth largest home telephone service provider in the United States, providing cable television, broadband Internet, and telephone service to both residential and commercial customers in 39 states and the...

, Cox Communications

Cox Communications

Cox Communications is a privately owned subsidiary of Cox Enterprises providing digital cable television, telecommunications and wireless services in the United States...

, EarthLink

EarthLink

EarthLink , is an Internet service provider headquartered in Atlanta, Georgia, USA. It claims 1.94 million subscribers.- Business :EarthLink provides a variety of Internet connection types, including dial-up, DSL, satellite, and cable. Both dial-up and high speed Internet access are available...

, Swisscom

Swisscom

Swisscom AG is a major telecommunications provider in Switzerland. Along with Swiss Post, it is a successor company to the former state-owned PTT. Its headquarters are located at Worblaufen near Bern...

, Tele2

Tele2

Tele2 AB is a major European telecommunications operator, with about 34 million customers in 11 countries. It serves as a fixed-line telephone operator, cable television provider, mobile phone operator and Internet service provider.- Overview :...

, XS4ALL

XS4ALL

XS4ALL is the third-oldest Internet service provider in the Netherlands, after NLnet and SURFnet. However, XS4ALL was the first company to offer Internet access to individuals, since 1993...

 (KPN), as well as social networkings companies MySpace

MySpace

Myspace is a social networking service owned by Specific Media LLC and pop star Justin Timberlake. Myspace launched in August 2003 and is headquartered in Beverly Hills, California. In August 2011, Myspace had 33.1 million unique U.S. visitors....

  and probably Facebook

Facebook

Facebook is a social networking service and website launched in February 2004, operated and privately owned by Facebook, Inc. , Facebook has more than 800 million active users. Users must register before using the site, after which they may create a personal profile, add other users as...

 

Company activity

Cloudmark was founded in September 2001 by Vipul Ved Prakash

Vipul Ved Prakash

Vipul Ved Prakash is a software engineer and entrepreneur, most widely known for creating Vipul's Razor, a collaborative anti-spam system. In 2001, Vipul co-founded Cloudmark, a company that...

 and Jordan Ritter.

Cloudmark sits on the board of directors of the Messaging Anti-Abuse Working Group, and the steering committee of the Anti-Phishing Working Group

Anti-Phishing Working Group

The Anti-Phishing Working Group is an international consortium that brings together businesses affected by phishing attacks, security products and services companies, law enforcement agencies, government agencies, trade association, regional international treaty organizations and communications...

, it also teams with Sendmail

Sendmail

Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and -delivery methods, including the Simple Mail Transfer Protocol used for email transport over the Internet....

, Habeas, IBM

IBM

International Business Machines Corporation or IBM is an American multinational technology and consulting corporation headquartered in Armonk, New York, United States. IBM manufactures and sells computer hardware and software, and it offers infrastructure, hosting and consulting services in areas...

, ReturnPath and Yahoo!

Yahoo!

Yahoo! Inc. is an American multinational internet corporation headquartered in Sunnyvale, California, United States. The company is perhaps best known for its web portal, search engine , Yahoo! Directory, Yahoo! Mail, Yahoo! News, Yahoo! Groups, Yahoo! Answers, advertising, online mapping ,...

.

In February 2010, Cloudmark acquired Bizanga Ltd., the developer of a message processing platform.